LOPT - FLYBACK EHT TRANSFORMER COMPARATION TABLE ORIGINAL ---> HR DIEMEN SPARE PART LIST 11

LOPT - FLYBACK EHT TRANSFORMER COMPARATION TABLE ORIGINAL ---> HR DIEMEN SPARE PART LIST 11

Here below a list of the original Flybacks LOPTS of many CRT TVs.

 Comparison list is organized with original code to the  HR DIEMEN corresponding Replacement part.

 

   These DC flybacks are found in every CRT computer monitor and are called the DST flybacks (diode-split transformers) because of the several high voltage diodes and secondaries inside. In addition to the high resistance resistor cascade (Bleeder) and focus/screen tuning potentiometers described above, these kinds may have an integrated high voltage filtering capacitor (few nanofarads at >=30 kV), or – optionally – a HV capacitor for dynamic focus.

The TV  DC flybacks are also diode-split (DST), however these are found in every modern CRT TV-set from mid-end 80s and onwards. These have just two screen-tuning potentiometers and no internal capacitors whatsoever !

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Original Reference	HR
B 106	HRT 216 A
B 106 P	HRT 216 P
B 180503	HR 42113
B 1895/641	HRT 507
B 1897/642	HRT 242 BP
B 196-25	HRT 225 BP
B 196-27	HRT 227 BP
B 196/27 M63	HRT 234 BP
B 32 3403	HR 6280
B 32 3403 001	HR 6280
B 32 3403 001 000	HR 6280
B 32 3403 002	HR 6280
B 32 3403 002 000	HR 6280
B 32 3403 003	HR 6280
B 32 3403 009	HR 6280
B 32 3409	HR 6280
B 32 3409 000	HR 6280
B 32 3409 000 000	HR 6280
B 32 3409 001	HR 6280
B 32 3409 001 000	HR 6280
B 32 3409 002	HR 6280
B 32 3409 002 000	HR 6280
B 32 3409 003	HR 6280
B 32 3412	HR 7166
B 32 3412 001	HR 7166
B 32 3412 001 000	HR 7166
B 32 3412 002	HR 7166
B 32 3412 002 000	HR 7166
B 32 3412 003	HR 7166
B 32 3412 003 000	HR 7166
B 32 3413	HR 7164
B 32 3413 001	HR 7164
B 32 3413 001 000	HR 7164
B 32 3413 002	HR 7164
B 32 3413 002 000	HR 7164
B 32 3413 003	HR 7164
B 32 3413 003 000	HR 7164
B 32 3418	HR 6383
B 32 3418 000	HR 6383
B 32 3418 000 000	HR 6383
B 32 3418 001	HR 6383
B 32 3418 001 000	HR 6383
B 32 3418 002 000	HR 6383
B 32 3426	HR 6383
B 32 3426 000	HR 6383
B 32 3426 001 000	HR 6383
B 32 3426 002	HR 6383
B 32 3426 002 000	HR 6383
B 32 3427	HR 8109
B 32 3427 000	HR 8109
B 32 3427 001	HR 8109
B 32 3427 002	HR 8109
B 32 3427 002 000	HR 8109
B 32 3431	HR 7164
B 32 3431 001 000	HR 7164
B 32 3431 002	HR 7164
B 32 3431 002 000	HR 7164
B 32 3437	HR 8109
B 32 3437 001	HR 8109
B 32 3437 001 000	HR 8109
B 32 3437 002	HR 8109
B 32 3437 002 000	HR 8109
B 32 3437 003	HR 8109
B 32 3438	HR 8110
B 32 3438 001	HR 8110
B 32 3438 002	HR 8110
B 32 3438 002 000	HR 8110
B 32 3438 003	HR 8110
B 32 3438 004	HR 8110
B 32 3439	HR 8111
B 32 3439 001	HR 8111
B 32 3439 001 000	HR 8111
B 32 3439 002	HR 8111
B 32 3439 002 000	HR 8111
B 32 3448	HR 8112
B 32 3448 001	HR 8112
B 32 3448 003	HR 8112
B 32 3448 003 000	HR 8112
B 32 3448 004	HR 8112
B 32 3449	HR 8113
B 32 3449 003	HR 8113
B 32 3449 003 000	HR 8113
B 32 3453	HR 8114
B 32 3453 001	HR 8114
B 32 3453 001 000	HR 8114
B 32 3453 003	HR 8114
B 32 3454	HR 8115
B 32 3454 001	HR 8115
B 32 3454 001 000	HR 8115
B 32 3454 003	HR 8115
B 82723-G2-A5	HR 1939
B 82723-G2-A8	HR 1918
B 82723-G2-B8	HR 1912
B 82723-G2-B9	HR 1910
B 82723-G2-C81	HR 1927
B 86	HRT 208
B 9045-S8154-M473	HRT 906
B 92-170	HR 3615
B 92924-K8254-M232	HRT 254
B 92945-A3151-M200	HRT 225 BP
B 92945-A7154-M200	HRT 230 BP
B 92945-A7154-M211	HRT 227 BP
B 92945-A7154-M222	HRT 227 BP
B 92945-A7154-M226	HRT 227 BP
B 92945-A7154-M232	HRT 227 BP
B 92945-A8154-M436	HRT 230 BP
B 92945-K7150-M233	HRT 263
B 92945-K7154-M203	HRT 263
B 92945-K7154-M232	HRT 231 BP
B 92945-K7154-M233	HRT 234 BP
B 92945-K7154-M453	HRT 230 BP
B 92945-K7154-M533	HRT 235 BP
B 92945-K8154-M233	HRT 254
B 92945-K8154-M533	HRT 234 BP
B 92945-S7154-M473	HRT 901
B 92945-S7154-M573	HRT 905
B 92945-S7154-M603	HRT 903
B 92945-S7154-M703	HRT 900
B 92945-S8154-M073	HRT 911
B 92945-S8154-M473	HRT 906
B 92945-S8154-M573	HRT 902
B 92945-S8154-M603	HRT 904
B 92945-S8154-M703	HRT 910
B 92945-S8254-M472	HRT 913
B 92950-B3000-M000	HRT 208
B 92950-B3000-M003	HRT 208
B 92950-B3000-M105	HRT 208
B 92951-B3000-M000	HRT 207
B 92952-A3000-M000	HRT 202
B 92955-A3000-M000	HRT 218 B
B 92955-A3000-M105	HRT 218 B
B 92955-B7000-M200	HRT 244 BP
B 92955-D3000-M109	HRT 218 B
B 92955-D3000-M208	HRT 240 BS
B 92955-D7000-M003	HRT 244 BP
B 92955-S7000-M002	HRT 244 BP
B 92960-A3000-M000	HRT 209
B 92960-A3000-M003	HRT 209
B 92962-A3000-M003	HRT 210 BF
B 92965-A3000-M100	HRT 225 BP
B 92965-A3000-M200	HRT 225 BP
B 92965-A3000-M208	HRT 225 BP
B 92965-A7000-M200	HRT 227 BP
B 92965-K7154-M212	HRT 227 BP
B 92966-A3000-M002	HRT 210 BF
B 92966-A7000-M000	HRT 210 BF
B 92966-A7000-M002	HRT 210 BF
B 92972-A3000-M001	HRT 505
B 92976-A3154-M001	HRT 507
B 92976-B3000-M001	HRT 507
B 92976-B3000-M015	HRT 507
B 92988-B3000-M350	HRT 231 BP
B/113	HR 1831
BB 1990	HR 1376
BEK057534OG1	HR 8336
BE057534 TR 1	HR 8336
BG 100	HRT 209
BG 1885-5184	HRT 202
BG 1885-5184-1	HRT 202
BG 1885-5184-2	HRT 202
BG 1885-5184-3	HRT 202
BG 1885-5184-4	HRT 202
BG 1885-5184-5	HRT 202
BG 1885-5184-6	HRT 202
BG 1885-5184-7	HRT 202
BG 1885-5185-8	HRT 202
BG 1885-5186	HRT 202
BG 1885-5187	HRT 202
BG 1885-5189	HRT 202
BG 1885-5192-6	HRT 203
BG 1886	HRT 203
BG 1886-5189	HRT 202
BG 1886-5189-1	HRT 202
BG 1886-51891	HRT 202
BG 1886-51892	HRT 202
BG 1886-51893	HRT 202
BG 1886-51894	HRT 202
BG 1886-51895	HRT 202
BG 1886-51896	HRT 202
BG 1886-51897	HRT 202
BG 1886-51898	HRT 202
BG 1886-51899	HRT 202
BG 1886-5192	HRT 203
BG 1886-5192-1	HRT 203
BG 1886-5192-3	HRT 203
BG 1886-5192-4	HRT 203
BG 1886-5192-5	HRT 203
BG 1888-5196	HRT 505
BG 1895-321-000	HRT 201
BG 1895-5184	HRT 202
BG 1895-5191	HRT 509
BG 1895-541	HRT 505
BG 1895-541-000	HRT 505
BG 1895-541-001	HRT 505
BG 1895-541-002	HRT 505
BG 1895-541-013	HRT 505
BG 1895-541-015	HRT 505
BG 1895-541-021	HRT 505
BG 1895-541-081	HRT 505
BG 1895-541-091	HRT 505
BG 1895-541-092	HRT 505
BG 1895-541-096	HRT 505
BG 1895-541-104	HRT 505
BG 1895-541-109	HRT 505
BG 1895-541-125	HRT 202
BG 1895-541-126	HRT 202
BG 1895-541-444	HRT 505
BG 1895-541-448	HRT 505
BG 1895-541-449	HRT 505
BG 1895-541-449-1	HRT 505
BG 1895-541-449-2	HRT 505
BG 1895-541-449-3	HRT 505
BG 1895-541-449-31	HRT 505
BG 1895-541-449-4	HRT 505
BG 1895-541-449-4H7	HRT 505
BG 1895-541-449-41	HRT 505
BG 1895-541-449-42	HRT 505
BG 1895-541-449-5	HRT 505
BG 1895-541-449-51	HRT 505
BG 1895-641	HRT 507
BG 1895-641-001	HRT 507
BG 1895-641-007	HRT 507
BG 1895-641-008	HRT 507
BG 1895-641-015	HRT 507
BG 1895-641-018	HRT 507
BG 1895-641-028	HRT 509
BG 1895-641-032	HRT 507
BG 1895-641-034	HRT 507
BG 1895-641-034 G	HRT 507
BG 1895-641-039 G	HRT 506
BG 1895-641-044	HRT 507
BG 1895-641-045	HRT 507
BG 1895-641-045 C	HRT 509
BG 1895-641-045 M	HRT 507
BG 1895-641-048	HRT 509
BG 1895-641-051	HRT 507
BG 1895-641-052	HRT 507
BG 1895-641-063	HRT 507
BG 1895-641-070	HRT 507
BG 1895-641-071	HRT 506
BG 1895-641-074	HRT 509
BG 1895-641-075	HRT 509
BG 1895-641-076	HRT 507
BG 1895-641-076-1	HRT 507
BG 1895-641-077	HRT 507
BG 1895-641-078	HRT 507
BG 1895-641-079	HRT 509
BG 1895-641-082	HRT 507
BG 1895-641-082 G	HRT 507
BG 1895-641-089	HRT 506
BG 1895-641-091	HRT 507
BG 1895-641-092	HRT 507
BG 1895-641-093	HRT 507
BG 1895-641-094	HRT 507
BG 1895-641-097	HRT 507
BG 1895-641-106	HRT 507
BG 1895-641-107	HRT 507
BG 1895-641-110	HRT 507
BG 1895-641-112	HRT 506
BG 1895-641-113	HRT 507
BG 1895-641-114	HRT 507
BG 1895-641-115	HRT 506
BG 1895-641-117	HRT 507
BG 1895-641-120	HRT 507
BG 1895-641-122	HRT 507
BG 1895-641-123	HRT 310
BG 1895-641-127	HRT 203
BG 1895-641-222	HRT 507
BG 1895-641-223	HRT 507
BG 1895-641-441	HRT 507
BG 1895-641-441-1	HRT 507
BG 1895-641-441-2	HRT 507
BG 1895-641-442	HRT 507
BG 1895-641-442-1	HRT 507
BG 1895-641-442-1 G	HRT 507
BG 1895-641-442-2	HRT 507
BG 1895-641-442-3	HRT 507
BG 1895-641-442-4	HRT 507
BG 1895-641-442-5	HRT 509
BG 1895-641-443	HRT 507
BG 1895-641-444	HRT 507
BG 1895-641-444-4	HRT 507
BG 1895-641-445	HRT 507
BG 1895-641-446	HRT 507
BG 1895-641-446-1	HRT 507
BG 1895-641-449	HRT 507
BG 1895-641-449-0	HRT 507
BG 1895-641-449-1	HRT 507
BG 1895-641-449-1 G	HRT 506
BG 1895-641-449-10	HRT 507
BG 1895-641-449-11	HRT 507
BG 1895-641-449-12	HRT 507
BG 1895-641-449-14	HRT 507
BG 1895-641-449-15	HRT 507
BG 1895-641-449-15G	HRT 507
BG 1895-641-449-16	HRT 506
BG 1895-641-449-17	HRT 506
BG 1895-641-449-18	HRT 507
BG 1895-641-449-2	HRT 507
BG 1895-641-449-21	HRT 507
BG 1895-641-449-3	HRT 507
BG 1895-641-449-31	HRT 507
BG 1895-641-449-4	HRT 507
BG 1895-641-449-4 G	HRT 507
BG 1895-641-449-5	HRT 507
BG 1895-641-449-6	HRT 507
BG 1895-641-449-61	HRT 507
BG 1895-641-449-62	HRT 507
BG 1895-641-449-63	HRT 507
BG 1895-641-449-7	HRT 507
BG 1895-641-449-8	HRT 507
BG 1895-641-449-8 S	HRT 507
BG 1895-641-449-9	HRT 506
BG 1895-641-559-6	HRT 506
BG 1895-641-70	HRT 507
BG 1897-641-0..	HRT 245 BS
BG 1897-641-000	HRT 245 BS
BG 1897-641-001	HRT 245 BS
BG 1897-641-002	HRT 246 BS
BG 1897-641-002 G	HRT 245 BS
BG 1897-641-003	HRT 245 BS
BG 1897-641-004	HRT 245 BS
BG 1897-641-007 G	HRT 246 BS
BG 1897-641-011	HRT 245 BS
BG 1897-641-088 G	HRT 245 BS
BG 1897-641-1..	HRT 245 BS
BG 1897-641-100	HRT 245 BS
BG 1897-641-102	HRT 245 BS
BG 1897-641-103	HRT 245 BS
BG 1897-641-104	HRT 246 BS
BG 1897-641-105	HRT 245 BS
BG 1897-641-115	HRT 245 BS
BG 1897-641-116	HRT 245 BS
BG 1897-641-118	HRT 245 BS
BG 1897-641-2..	HRT 245 BS
BG 1897-641-200	HRT 245 BS
BG 1897-641-3..	HRT 240 BS
BG 1897-641-300	HRT 240 BS
BG 1897-641-300 G	HRT 240 BS
BG 1897-641-301	HRT 240 BS
BG 1897-641-301 G	HRT 240 BS
BG 1897-641-302	HRT 240 BS
BG 1897-641-303	HRT 240 BS
BG 1897-641-304	HRT 240 BS
BG 1897-641-307	HRT 240 BS
BG 1897-641-308	HRT 240 BS
BG 1897-641-309	HRT 240 BS
BG 1897-641-310	HRT 240 BS
BG 1897-641-311	HRT 240 BS
BG 1897-641-312	HRT 240 BS
BG 1897-641-313	HRT 240 BS
BG 1897-641-318	HRT 240 BS
BG 1897-642-0..	HRT 242 BP
BG 1897-642-000	HRT 243 BP
BG 1897-642-001	HRT 242 BP
BG 1897-642-002	HRT 242 BP
BG 1897-642-003	HRT 242 BP
BG 1897-642-011	HRT 242 BP
BG 1897-642-068	HRT 242 BP
BG 1897-642-080	HRT 242 BP
BG 1897-642-086	HRT 242 BP
BG 1897-642-090	HRT 243 BP
BG 1897-642-098	HRT 242 BP
BG 1897-642-099	HRT 242 BP
BG 1897-642-1..	HRT 242 BP
BG 1897-642-100	HRT 242 BP
BG 1897-642-103	HRT 242 BP
BG 1897-642-105	HRT 242 BP
BG 1897-642-107	HRT 242 BP
BG 1897-642-111	HRT 242 BP
BG 1897-642-119	HRT 242 BP
BG 1897-642-2..	HRT 242 BP
BG 1897-642-200	HRT 242 BP
BG 1897-642-3..	HRT 241 BP
BG 1897-642-300	HRT 241 BP
BG 1897-642-301	HRT 241 BP
BG 1897-642-303	HRT 241 BP
BG 1897-642-304	HRT 244 BP
BG 1897-642-307	HRT 241 BP
BG 1897-642-308	HRT 244 BP
BG 1897-642-309	HRT 244 BP
BG 1897-642-310	HRT 241 BP
BG 1897-642-311	HRT 241 BP
BG 1897-642-312	HRT 241 BP
BG 1897-642-314	HRT 241 BP
BG 1897-642-315	HRT 241 BP
BG 1897-642-316	HRT 241 BP
BG 1897-642-320	HRT 241 BP
BG 1897-642-324	HRT 244 BP
BG 1898-541	HRT 505 P
BG 1898-541-003	HRT 505 P
BG 1898-541-005	HRT 505 P
BG 1898-541-007	HRT 505 P
BG 1898-641	HRT 508 P
BG 1898-641-NM	HRT 508 P
BG 1898-641-ST	HRT 508 P
BG 1898-641-004	HRT 508 P
BG 1898-641-004 L	HRT 508 P
BG 1898-641-005	HRT 508 P
BG 1898-641-006	HRT 508 PD
BG 1898-641-007	HRT 508 PD
BG 1898-641-007 R	HRT 508 PD
BG 1898-641-008	HRT 508 P
BG 1898-641-009	HRT 508 P
BG 1898-641-014	HRT 508 P
BG 1898-641-018	HRT 508 P
BG 1898-641-045	HRT 508 P
BG 1898-641-051	HRT 508 P
BG 1898-641-072	HRT 508 P
BG 1898-641-082	HRT 508 P
BG 1898-641-083	HRT 508 PD
BG 1898-641-084	HRT 508 P
BG 1898-641-085	HRT 508 P
BG 1898-641-095	HRT 508 P
BG 1898-641-1 FN	HRT 508 P
BG 1898-641-318	HRT 508 P
BG 1898-641-322	HRT 508 P
BG 1898-641-332	HRT 508 P
BG 1898-641-422-3	HRT 508 P
BG 1898-641-442-3	HRT 508 P
BG 1898-641-449	HRT 508 P
BG 1898-641-449-1	HRT 508 P
BG 1898-641-449-2	HRT 508 P
BG 1898-641-449-3	HRT 508 P
BG 1899-642-301	HRT 250
BG 1899-642-303	HRT 265
BG 200-43	HRT 205
BG 200-63	HRT 507
BG 200-641	HRT 209
BG 2000-43	HRT 205
BG 2000-541-041	HRT 207
BG 2000-641	HRT 209
BG 2000-641 LK	HRT 209
BG 2000-641-000	HRT 209
BG 2000-641-001	HRT 209
BG 2000-641-002	HRT 209
BG 2000-641-002 G	HRT 209
BG 2000-641-003	HRT 209
BG 2000-641-004	HRT 212
BG 2000-641-005	HRT 209
BG 2000-641-006	HRT 209
BG 2000-641-007	HRT 209
BG 2000-641-008	HRT 209
BG 2000-641-008 G	HRT 209
BG 2000-641-009	HRT 209
BG 2000-641-010	HRT 209
BG 2000-641-011	HRT 209
BG 2000-641-012	HRT 209
BG 2000-641-012 G	HRT 209
BG 2000-641-013	HRT 209
BG 2000-641-014	HRT 209
BG 2000-641-015	HRT 209
BG 2000-641-016	HRT 209
BG 2000-641-017	HRT 208
BG 2000-641-021	HRT 209
BG 2000-641-022	HRT 209
BG 2000-641-333	HRT 209
BG 2000-641-801	HRT 211 P
BG 2000-641-802	HRT 211 P
BG 2032-642-3001	HRT 248 BP
BG 2032-642-3002	HRT 249
BG 2032-642-3003	HRT 255
BG 2032-642-3003 M	HRT 255
BG 2032-642-3005	HRT 250
BG 2032-642-3006	HRT 264
BG 2032-642-3201	HRT 251
BG 2032-642-3202	HRT 250
BG 2032-642-3206	HRT 265
BG 2034-642-3008	HRT 400
BG 2034-642-3008 G	HRT 400
BG 2034-642-3010	HRT 400
BG 2034-642-3010 G	HRT 400
BG 2034-642-3011	HRT 401
BG 2034-642-3011 M	HRT 401
BG 2034-642-3205	HRT 402
BG 2034-642-3206	HRT 402
BG 2034-642-3206 G	HRT 402
BG 2034-642-3207	HRT 403
BG 2034-642-3207 M	HRT 403
BG 2034-642-3209 G	HRT 404
BG 2077-642-1003	HRT 903
BG 2077-642-1003 H	HRT 903
BG 2077-642-1003 HG	HRT 903
BG 2077-642-1004	HRT 904
BG 2077-642-1004 H	HRT 904
BG 2077-642-1004 HG	HRT 904
BG 2077-642-1023 HG	HRT 903
BG 2087-642-1001	HRT 901
BG 2087-642-1001 G	HRT 901
BG 2087-642-1002	HRT 902
BG 2087-642-1002 G	HRT 902
BG 2087-642-1006	HRT 906
BG 2087-642-1006 G	HRT 906
BG 2087-642-1010	HRT 910
BG 2087-642-1010 G	HRT 910
BG 2087-642-1011	HRT 911
BG 2087-642-1011 H	HRT 911
BG 2087-642-1011 HG	HRT 911
BG 2087-642-1013	HRT 913
BG 2087-642-1015	HRT 901
BG 2087-642-1020	HRT 920
BG 2087-642-1020 G	HRT 920
BG 2087-642-1022 G	HRT 902
BG 2087-642-1024	HRT 911
BG 2096-641	HRT 210 BF
BG 2096-641-0..	HRT 210 BF
BG 2096-641-000	HRT 210 BF
BG 2096-641-001	HRT 210 BF
BG 2096-641-002	HRT 210 BF
BG 2096-641-003	HRT 210 BF
BG 2096-641-004	HRT 210 BF
BG 2096-641-008	HRT 210 BF
BG 2097-641-0..	HRT 222 BS
BG 2097-641-000	HRT 222 BS
BG 2097-641-001	HRT 222 BS
BG 2097-641-1..	HRT 222 BS
BG 2097-641-100	HRT 222 BS
BG 2097-641-2..	HRT 222 BS
BG 2097-641-20 AX	HRT 222 BS
BG 2097-641-200	HRT 222 BS
BG 2097-641-3..	HRT 226 BS
BG 2097-641-300	HRT 226 BS
BG 2097-641-302	HRT 226 BS
BG 2097-641-303	HRT 226 BS
BG 2097-641-305	HRT 226 BS
BG 2097-641-306	HRT 226 BS
BG 2097-641-307	HRT 226 BS
BG 2097-641-308	HRT 226 BS
BG 2097-641-309	HRT 226 BS
BG 2097-641-311	HRT 226 BS
BG 2097-641-312	HRT 226 BS
BG 2097-641-313	HRT 226 BS
BG 2097-641-314	HRT 226 BS
BG 2097-641-315	HRT 226 BS
BG 2097-641-316	HRT 226 BS
BG 2097-641-318	HRT 226 BS
BG 2097-641-319	HRT 226 BS
BG 2097-641-320	HRT 226 BS
BG 2097-641-321	HRT 226 BS
BG 2097-641-330	HRT 226 BS
BG 2097-641-331	HRT 226 BS
BG 2097-641-341	HRT 226 BS
BG 2097-641-342	HRT 226 BS
BG 2097-641-343	HRT 226 BS
BG 2097-641-345	HRT 226 BS
BG 2097-641-353	HRT 226 BS
BG 2097-641-387	HRT 226 BS
BG 2097-641-389	HRT 226 BS
BG 2097-641-502	HRT 258 BS
BG 2097-641-507	HRT 258 BS
BG 2097-642-0..	HRT 225 BP
BG 2097-642-000	HRT 225 BP
BG 2097-642-001	HRT 225 BP
BG 2097-642-002	HRT 225 BP
BG 2097-642-003	HRT 225 BP
BG 2097-642-004	HRT 225 BP
BG 2097-642-005	HRT 225 BP
BG 2097-642-006	HRT 225 BP
BG 2097-642-007	HRT 225 BP
BG 2097-642-008	HRT 225 BP
BG 2097-642-011	HRT 225 BP
BG 2097-642-011 G	HRT 225 BP
BG 2097-642-015	HRT 225 BP
BG 2097-642-1..	HRT 225 BP
BG 2097-642-100	HRT 225 BP
BG 2097-642-2..	HRT 225 BP
BG 2097-642-200	HRT 225 BP
BG 2097-642-259	HRT 225 BP
BG 2097-642-3..	HRT 227 BP
BG 2097-642-3.. I	HRT 227 BP
BG 2097-642-300	HRT 227 BP
BG 2097-642-301	HRT 227 BP
BG 2097-642-303	HRT 230 BP
BG 2097-642-306	HRT 230 BP
BG 2097-642-307	HRT 230 BP
BG 2097-642-308	HRT 227 BP
BG 2097-642-309	HRT 227 BP
BG 2097-642-310	HRT 227 BP
BG 2097-642-311	HRT 227 BP
BG 2097-642-313	HRT 231 BP
BG 2097-642-314	HRT 231 BP
BG 2097-642-315	HRT 230 BP
BG 2097-642-316	HRT 229 BP
BG 2097-642-317	HRT 230 BP
BG 2097-642-318	HRT 227 BP
BG 2097-642-321	HRT 230 BP
BG 2097-642-321 M2	HRT 231 BP
BG 2097-642-322	HRT 227 BP
BG 2097-642-323	HRT 227 BP
BG 2097-642-324	HRT 227 BP
BG 2097-642-325	HRT 227 BP
BG 2097-642-326	HRT 227 BP
BG 2097-642-327	HRT 236 BP
BG 2097-642-328	HRT 227 BP
BG 2097-642-329	HRT 230 BP
BG 2097-642-332	HRT 227 BP
BG 2097-642-333	HRT 231 BP
BG 2097-642-334	HRT 230 BP
BG 2097-642-335	HRT 230 BP
BG 2097-642-336	HRT 227 BP
BG 2097-642-337	HRT 231 BP
BG 2097-642-338	HRT 227 BP
BG 2097-642-339	HRT 227 BP
BG 2097-642-340	HRT 263
BG 2097-642-340 G	HRT 263
BG 2097-642-341	HRT 227 BP
BG 2097-642-343	HRT 227 BP
BG 2097-642-344	HRT 231 BP
BG 2097-642-346	HRT 231 BP
BG 2097-642-347	HRT 236 BP
BG 2097-642-348	HRT 230 BP
BG 2097-642-349	HRT 227 BP
BG 2097-642-350	HRT 230 BP
BG 2097-642-351	HRT 230 BP
BG 2097-642-352	HRT 230 BP
BG 2097-642-354	HRT 230 BP
BG 2097-642-355	HRT 227 BP
BG 2097-642-356	HRT 236 BP
BG 2097-642-357	HRT 231 BP
BG 2097-642-358	HRT 227 BP
BG 2097-642-359	HRT 230 BP
BG 2097-642-360	HRT 230 BP
BG 2097-642-361	HRT 227 BP
BG 2097-642-362	HRT 227 BP
BG 2097-642-363	HRT 233 BP
BG 2097-642-364	HRT 227 BP
BG 2097-642-366	HRT 227 BP
BG 2097-642-367	HRT 230 BP
BG 2097-642-368	HRT 227 BP
BG 2097-642-369	HRT 234 BP
BG 2097-642-369 G	HRT 234 BP
BG 2097-642-370	HRT 254
BG 2097-642-370 G	HRT 254
BG 2097-642-373	HRT 227 BP
BG 2097-642-374	HRT 227 BP
BG 2097-642-376	HRT 227 BP
BG 2097-642-377	HRT 227 BP
BG 2097-642-378	HRT 231 BP
BG 2097-642-381	HRT 227 BP
BG 2097-642-382	HRT 227 BP
BG 2097-642-383	HRT 230 BP
BG 2097-642-384	HRT 227 BP
BG 2097-642-385	HRT 230 BP
BG 2097-642-385 G	HRT 230 BP
BG 2097-642-388	HRT 227 BP
BG 2097-642-390	HRT 235 BP
BG 2097-642-390 G	HRT 235 BP
BG 2097-642-391	HRT 234 BP
BG 2097-642-392	HRT 230 BP
BG 2097-642-393	HRT 227 BP
BG 2097-642-400	HRT 254
BG 2097-642-401	HRT 227 BP
BG 2097-642-403	HRT 254
BG 2097-642-404	HRT 227 BP
BG 2097-642-405	HRT 237 BP
BG 2097-642-410	HRT 227 BP
BG 2097-642-411	HRT 230 BP
BG 2097-642-417	HRT 227 BP
BG 2097-642-419	HRT 227 BP
BG 2597-643-0001	HR 6119
BG1895641LK	HRT 507
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BG20976413LK	HRT 226 BS
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BG20976423RS	HRT 230 BP
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BH 26-00016 A	HR 46153
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BSC 0102	HR 7405
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BSC 0371 B	HR 7437
BSC 0402	HR 7518
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BSC 0406	HR 7184
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BSC 0603	HR 8310
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BSC 0614	HR 7812
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BSC 1012	HR 1490
BSC 1013	HR 1147
BSC 1101	HR 7301
BSC 1102	HR 7103
BSC 1201	HR 2018
BSC 1202	HR 5701
BSC 1203	HR 2019
BSC 1204	HR 2016
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BSC 1304	HR 6003
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BSC 1308	HR 6009
BSC 1310	HR 1127
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BSC 1313	HR 3628
BSC 1314	HR 1117
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BSC 1503	HR 7041
BSC 17-08481	HR 46035
BSC 19-03448	HR 7628
BSC 19-23561	HR 7775
BSC 1901	HR 7460
BSC 20-033 A	HR 8361
BSC 20-04	HR 7462
BSC 20-04 A	HR 7462
BSC 20-08524	HR 7190
BSC 20-13567	HR 6260
BSC 20-14023	HR 7301
BSC 2004	HR 7462
BSC 21-04449	HR 46032
BSC 21-04751	HR 8197
BSC 21-08364	HR 46079
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BSC 21-2643 S	HR 8803
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BSC 22-0134	HR 7041
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BSC 22-04018	HR 8310
BSC 22-04187 A	HR 7731
BSC 22-04305	HR 46034
BSC 22-05072	HR 8489
BSC 22-05136 A	HR 8489
BSC 22-05136 B	HR 8490
BSC 22-0562	HR 8848
BSC 22-06 F	HR 7170
BSC 22-08103	HR 7136
BSC 22-08132	HR 7254
BSC 22-08205	HR 7184
BSC 22-08617	HR 7500
BSC 22-10030	HR 6296
BSC 22-14611	HR 7306
BSC 22-15041	HR 7405
BSC 22-17168	HR 6133
BSC 22-2012	HR 8758
BSC 22-20278	HR 7716
BSC 22-21114	HR 7460
BSC 22-21563	HR 7455
BSC 22-21725	HR 7455
BSC 22-21735	HR 7455
BSC 22-23436	HR 7448
BSC 22-23683	HR 7970
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BSC 22-2501 B	HR 7865
BSC 22-2903	HR 8600
BSC 22-2952	HR 8190
BSC 22-6501	HR 7971
BSC 2201 A	HR 7474
BSC 2203	HR 7474
BSC 23 M	HR 8490
BSC 23 N 301	HR 7716
BSC 23-01	HR 8489
BSC 23-01 P	HR 8489
BSC 23-0107	HR 8490
BSC 23-0167	HR 7136
BSC 23-03693	HR 7744
BSC 23-0374	HR 7686
BSC 23-0374 T	HR 7686
BSC 23-03749	HR 7686
BSC 23-05129	HR 8489
BSC 23-0801	HR 8499
BSC 23-08102	HR 7136
BSC 23-08130	HR 7132
BSC 23-08616	HR 7506
BSC 23-1108	HR 7679
BSC 23-1108 J	HR 7679
BSC 23-14021	HR 6060
BSC 23-14042	HR 6009
BSC 23-14058	HR 7103
BSC 23-14183	HR 6003
BSC 23-17317	HR 6478
BSC 23-17498	HR 7311
BSC 23-202	HR 7716
BSC 23-21419	HR 46007
BSC 23-21550	HR 46045
BSC 23-3314	HR 7462
BSC 23-3505	HR 7301
BSC 23-82509	HR 7522
BSC 2301	HR 8489
BSC 24-0108	HR 7041
BSC 24-01082	HR 6396
BSC 24-01113	HR 7462
BSC 24-01194	HR 7245
BSC 24-01200	HR 8489
BSC 24-01318	HR 46031
BSC 24-0156	HR 7145
BSC 24-0175	HR 7032
BSC 24-0176	HR 7108
BSC 24-02	HR 7716
BSC 24-02038	HR 7716
BSC 24-03185	HR 7483
BSC 24-03663	HR 7437
BSC 24-04055	HR 7731
BSC 24-04075	HR 8489
BSC 24-04085	HR 8489
BSC 24-04131	HR 7474
BSC 24-04171	HR 7472
BSC 24-04187	HR 7472
BSC 24-05181	HR 8490
BSC 24-06046	HR 8308
BSC 24-06240	HR 7462
BSC 24-06298	HR 7193
BSC 24-08007	HR 7042
BSC 24-08009	HR 7083
BSC 24-08164	HR 7041
BSC 24-08313	HR 7184
BSC 24-09074	HR 7624
BSC 24-1101	HR 7983
BSC 24-1102	HR 8351
BSC 24-14059	HR 6408
BSC 24-14367	HR 5701
BSC 24-15020	HR 7408
BSC 24-15024	HR 7408
BSC 24-16005	HR 7668
BSC 24-16036	HR 7716
BSC 24-17220	HR 1610
BSC 24-1801	HR 8351
BSC 24-19579	HR 7244
BSC 24-23370	HR 46089
BSC 24-23486	HR 7706
BSC 24-23547	HR 46137
BSC 24-2951	HR 8351
BSC 2402	HR 7716
BSC 2403	HR 7731
BSC 25 N 0401	HR 8107
BSC 25 N 1506	HR 7983
BSC 25-01 H	HR 7022
BSC 25-0101	HR 7022
BSC 25-0109	HR 8799
BSC 25-0115	HR 7145
BSC 25-0120	HR 7146
BSC 25-0120 F	HR 7146
BSC 25-0125	HR 7145
BSC 25-0125 F	HR 7145
BSC 25-0143	HR 7022
BSC 25-0157	HR 7146
BSC 25-0160	HR 8799
BSC 25-0177	HR 46076
BSC 25-02 P	HR 7173
BSC 25-02248	HR 7731
BSC 25-0317 S	HR 7459
BSC 25-0317-5	HR 7459
BSC 25-03189	HR 7451
BSC 25-03191	HR 7654
BSC 25-04004	HR 46038
BSC 25-04026	HR 46038
BSC 25-0541	HR 7976
BSC 25-0561	HR 8558
BSC 25-08286	HR 6385
BSC 25-09 F	HR 8799
BSC 25-0906	HR 8269
BSC 25-14172	HR 6089
BSC 25-15 F	HR 7145
BSC 25-17210	HR 6012
BSC 25-17545	HR 2176
BSC 25-2059 S	HR 8447
BSC 25-2068 S	HR 8544
BSC 25-20689	HR 8544
BSC 25-21475	HR 7690
BSC 25-21714	HR 7474
BSC 25-23629	HR 46081
BSC 25-2505	HR 7607
BSC 25-2701	HR 7484
BSC 25-2701 A	HR 7484
BSC 25-3373	HR 8656
BSC 25-5508	HR 7880
BSC 25-5509	HR 8480
BSC 25-6101	HR 8785
BSC 25-6102	HR 7351
BSC 2502 P	HR 7173
BSC 2506	HR 6296
BSC 2513	HR 6296
BSC 26-N 1001	HR 7960
BSC 26-N 2106	HR 8123
BSC 26-N 2114	HR 8123
BSC 26-N 2119	HR 8300
BSC 26-01	HR 7462
BSC 26-04369	HR 7736
BSC 26-0901	HR 8527
BSC 26-0901 H	HR 8527
BSC 26-2121	HR 8358
BSC 26-3902	HR 8562
BSC 26-3902 A	HR 8562
BSC 26-5601	HR 7103
BSC 2601	HR 7462
BSC 2601 A	HR 7462
BSC 2601 B	HR 7716
BSC 2602	HR 7483
BSC 2604	HR 7468
BSC 2610 B	HR 7716
BSC 2610 C	HR 7716
BSC 27 N 2213	HR 8276
BSC 27-17413	HR 6030
BSC 27-21708	HR 7460
BSC 28-03518	HR 7439
BSC 28-17498	HR 7311
BSC 28-23647	HR 8335
BSC 2902	HR 7668
BSC 2903	HR 7455
BSC 30-23553	HR 7721
BSC 3001 SF	HR 7462
BSC 3103	HR 7434
BSC 3201	HR 7472
BSC 35-01	HR 8489
BSC 35-02	HR 8084
BSC 35-10	HR 8754
BSC 3501	HR 8489
BSC 3501 A	HR 8489
BSC 3501 A-1 T	HR 8489
BSC 3502	HR 8084
BSC 4601	HR 8490
BSC 4603	HR 8489
BSC 4604 A	HR 8489
BSG 2516	HR 8205
BSM 31-3102	HR 7664
BV 4-06	HR 9400
BV 42-25	HR 9629
BV 42-30	HR 9634
BV 42-44	HR 6018
BV 42-46	HR 9363
BV 42-50	HR 9408
BV 42-54	HR 9355
BV 42-60	HR 6228
BV 42-75	HR 7031
BV 52-50	HR 9408
BV 7279-047.01	HR 2011
BV 9279-057.01	HR 2014
BV 9279-066.01	HR 2017
BV 9279-068.01	HR 3621
BW 00101	HR 7860
BW 00102	HR 7859
BW 00103	HR 8845
BW 00221	HR 7764
BW 00231	HR 8599
BW 00422	HR 7980
BW 01041	HR 8814
BW 01041 A	HR 8814
BW 01061	HR 8362
BW 02871	HR 8810
BWF 2-9236-05	HR 42075

Line transformers generate the necessary deflection pulse and other many key voltages and the  high voltage for anode of the picture tube in tube televisions and computer monitors. Usually this is around 30 kV for a color device, but the current is  with approx. 0.5 to 4 mA.

The line transformer or horizontal output transformer (English: flyback transformer or line output transformer) is part of a television / monitor with picture tube. It is used to supply the line deflection coil of the deflection system and at the same time usually also to generate the high voltage of 20 to 30 kV required for the operation of the picture tube and other voltages necessary for the operation of the device.

Line transformers work with the line frequency, with European TV sets with 15.625 kHz. Line transformers of 100 Hz televisions work at twice the frequency, i.e. at 31.25 kHz. In monitors, the line transformer is operated at different frequencies, which depend on the resolution of the image sent by the computer. For example, the line frequency of a monitor with a resolution of 1024 × 768 pixels and 85 Hz vertical frequency is approximately 68.7 kHz. With these frequencies, the line output stage switches a switching tube or today a switching transistor, which are used to control the line transformer.
The whistling noise of some older monitors and most older, conventional TV sets arises from the fact that mainly the line transformer, but also other components such as coils and capacitors, are mechanically excited to vibrate by the occurring magnetic and electrostatic forces. Whistling has a frequency of 15.625 kHz due to the European television standard. TVs with 100 Hz technology and most high-resolution computer monitors whistle outside the listening area........

Line transformers are potted with resin and have a ferrite core and are therefore of course only suitable for high frequencies in the kHz range. Newer types, so-called diode split transformers, contain many individual diodes between the windings and thus supply a rectified high voltage (pulsating DC voltage). Older models made of black and white devices have an external cascade, the direct (high-frequency) output voltage is then only about 8 kV, but a little more current is available with such AC line transformers. Line transformers require an electronic control circuit which provides a square wave signal in the range of approx. 15 kHz.

Diode split transformer with permanently cast diodes and DC output The advantage of line transformers: They are easy and inexpensive (or free) and can be obtained in large numbers at radio / TV shops and in computer shops where devices are disposed of. Especially nowadays, in which tube monitors have to make room for flat screens, many old monitors and TVs are disposed of.

Removal and wiring of a line transformer:

Important when removing the line transformer from the TV or monitor: First discharge the picture tube, then remove the high-voltage connection, and draw out the pin assignment of the line transformer before unsoldering. Two connections are particularly important: supply supply (approx. 150V from the power supply unit) and connection that goes to the collector of the horizontal output transistor or on very older types to a tube or thyristor final stage.


The thick, well-insulated, red cable is the high-voltage output (approx. 30kV), while the somewhat thinner, black cable carries the focus voltage, which is only around 6kV. Finally, the orange cable brings the grid 2 voltage, which is only a few hundred volts. Television and monitor flyback transformer pinout have some common designed except that the monitor flyback have a internal capacitor built in. The internal capacitor value have around 2.7 nanofarad to 4.5 nanofarad to improve the picture quality especially when the monitor which can go for a higher resolution compare to Tv. If without the internal capacitor in the monitor flyback the display will curve or slightly out of shape especially at both the right and left hand side of the picture and may present other imperfections not admitted for monitors. It acts as a filter. Internally they may have a high vealue resitor (600 to 900 mega ohm) in parallel to HV output. This to adapt the ouput impedance of the LOPT to the CRT Anode.

Mostly tv and monitor flyback transformers have about ten pins at the bottom of the flyback. Each of the pin have a purpose or function as part of a complete circuit. The common pins that you can find in monitor flyback are: B+ pin, Horizontal collector pulse, ABL (automatic blanking limiter), GROUND, G1, AFC (automatic frequency control), VCC, HEATER (to filament) and X-RAY protection.

The B+ and horizontal collector pulse pin forms one winding which we call it as flyback primary winding. It can  only can be test by using a flyback meter such as the  Lopt tester flyback transformer pinoutor sencore LC102 and LC103C.

Note that some monitors and TV design may have a separate HV and deflections circuits
.
Normal meters can't check this kind of fault. This is the most important winding compares to others and it can easily developed a short circuit when B+ voltage line or Horizontal output transistor (HOT) shorted. Sometimes a shorted internal capacitor in the flyback transformer may cause the primary winding to burn internally and the flyback became bulge and poured out the epoxy.

Other pins are the ground, G1, and AFC winding. AFC stand for automatic frequency control and it send signal (pulse) from the flyback transformer to the horizontal oscillator ic to lock or synchronize the frequency of the monitor. If this AFC line fails the picture will shift either to the far left or far right. There is no way that you can adjust the picture to the center even with the internal adjustment in the mainboard. The purpose of G1 voltage is to pull the electron generated from the cathode (after the heater or filament heat up) and passed it to G2 which is the screen voltage.

G1 normally is a negative voltage or positive from few volts to 32 volts in some most ancient designs . Most tv picture tube do not use G1 voltage. If the G1 voltage is missing or zero voltage to the picture tube the monitor display will becomes very bright with retrace lines (diagonal lines or flyback lines) across the screen and sometimes the monitor will goes into shutdown mode.
ABL stand for automatic beam limiter- I refer it as a limiter further circuit. Why? because whenever there is a contrast or bright problem i will search for this pin and begin to trace from there. Normally a resistor increased in resistance and a shorted ceramic capacitor caused the display to become dim and you may think it might be the fault of a bad CRT.

Heater or filament pin nowadays hardly found in monitor flyback because the crt heater voltage now is derived directly from the switch mode power supply. However heater pin is still can be found in television flyback transformer. If the anode voltage is too high (more than 30 kilovolt), the x-ray protect pin will send a signal to horizontal oscillator ic in order to disable the horizontal drive waveform THIS FOR SAFETY REASONS.

Without the horizontal drive pulse the high voltage generated by the flyback will collapsed and protect the user from excessive x-ray.

The flyback transformer pinout will also generate high pulse ac which later convert to dc through an ultra fast recovery diode. For your information, the ac pulse generated by the flyback transformer cannot be check with our normal analog or digital meter. the frequency is so high and you need a special meter to do the job. The dc voltages are then supply to various circuit such as the vertical output circuit. If you  understand all the functions of each flyback transformer pinout, repairing  monitor or tv will be much easier and save your precious time.

 TV / MONITOR  Fly-Back Transformer Replacement GUIDE:

All repairers with  experience, once made a replacement of a driver transformer with more or less fortune. All we did was to methodize the work and modify the circuit to work optimally.

But....... when it comes to a fly-back Transformer , practically all repairers think that if the replacement is not the exact fly-back  Transformer, absolutely nothing can be done. In principle we would like to clarify that manufacturers of replacement fly-backs do not manufacture all fly-back Transformer variants; they only manufacture some of them and then connect the bases according to the different models and mark them with a different code. ANYWAY SPECIFICITY IS OEM RELATED BY DESIGN.

EXAMPLE:Between different 20" fly-backs Transformer , for example, there are usually minimal differences except in the position of the legs. If there are notable differences, it is in the high voltage because this varies according to the size of the screen. The 14" tubes usually have extra high tensions of 18 to 20 KV; the 20" tubes between 23 and 25 KV and finally the 29 and 33" tubes have tensions higher than 28 KV / 36KV. In addition, the larger tubes have a different horizontal output circuit that has an east/west modulator to correct the pad effect plus other specific parts.

Let's limit our analysis to 14 and 20" TVs from which the fly-back Transformer is not achieved. The first step is to know a fly-back inside to understand the replacement work. Let's analyze the returns and live of the auxiliary windings.
CHECK schematic diagram and study it.

A modern fly-back Transformer is a hybrid of a high and low voltage transformer and a screen voltage and focus adjustment circuit. It can be divided for analysis into a transformer and a focus pack.

NOTE:  fly-back Transformer IS SPECIFIC TO TV / MONITOR CHASSIS BY DESIGN, TAKE ALWAYS ORIGINAL OEM OR ORIGINAL MATCHED REPLACEMENTS.

Transformer analysis:

The transformer is fundamental part of the horizontal output circuit because it connects the source to the collector of the horizontal output transistor through an inductance about 4 times greater than that of the yoke. In this way, only 1.5 to 1.7 A of the 6 or 7 A peak-to-peak current through the yoke flows through the fly-back and the horizontal source capacitor. Be aware that in older tvs which may  have greater deflection systems the currents are higher.

But the fly-back is not an inductor, it is a transformer and part of the energy existing in its primary is transformed into several low voltage windings, which feed different stages of the TV such as the jungle, the vertical output, the video stage , the sound, key voltages for chroma, sync, and many others services depending on design, and above all the tube filament (which is not rectified but applied as AC). These windings are strongly coupled to the primary because they are built above or below it.

The geometry of the fly-back core is very particular because it is a transformer that has a high voltage winding and the turns of that winding must be away from the core. Therefore, the classic shape of the core with an "E" and "I" shape is abandoned and a shape with two "U"'s is used where the HV winding enters loosely. The spool of that winding has a slotted shape, where only the diameter of a wire enters. In this way the winding is really a wire spiral and in reality it is not one single winding but 4 or many more , each one with its corresponding high voltage diode and its filtering capacitor, also of high voltage. This winding, because of its shape, is loosely coupled to the primary so that a fault in it, is not transferred as a short circuit but as a reduction of primary inductance but it will produce a malfunction.

As we know, the return of the high voltage winding is not connected to ground, but to the horizontal source. A 20" tube supports only a maximum current for each cathode of 330 uA; between the three cathodes they can consume a maximum of 1 mA and that current is directed from the cathodes to the aluminizing of the screen that is part of the final anode of the tube. This current returns through the winding and produces a voltage drop in a network
Synthetically, if the image is black there is no current and the voltage of ABL  When the brightness increases, the voltage increases  so that when 1 mA circulates, the voltage   is cancelled and there operates the jungle / luminance matrix stages limiting the brightness and contrast.

Analysis of the focus / G2 VOLT pack inside  DST Transformer

Flyback deflection systems are well known and widely used in television receivers. In such systems, a deflection voltage source drives an autotransformer with a ramp shaped current for deflecting an electron beam across the phosphor coated faceplate of a cathode ray tube (CRT). At the end of the ramp waveform, a relatively large retrace pulse is developed. This pulse is magnified by the turns of the flyback transformer winding and rectified to develop the high DC voltage required to operate the CRT. As is well known, although the high voltage system is tuned, the high DC voltage produced varies substantially with system loading that occurs due to increases in the electron beam current of the CRT. There have been numerous circuits in the art for "stiffening" the high voltage supply. In many applications, a separate, non-deflection-based high voltage system is used because of its tighter tolerance on regulation.

With the growing use of computer monitors, the need for precision CRT displays has increased. In these uses, high voltage regulation is critical and needs to be closely controlled to prevent unacceptable raster distortion and size changes. On the other hand, the needs of the marketplace are such that the cost of the monitor must be maintained as low as possible.

The focus pack has several functions: it is a double variable voltage attenuator also known as HV Bleeder. The highest voltage is for the focus and the lowest for the screen. The older tubes are low focus and the focus pack delivers voltages of approximately 8 KV. The newer and bigger ones are high focus and deliver about 9.5 KV. It is not possible to change a low-focus fly-back for a high-focus one, because it does not adjust the focus.

Generally, the conventional bleeder resistor is manufactured in the following manner. , there is prepared a ceramic substrate  made of Al2 O3 having a purity of about 96%. Its thickness is about 0.5-1.2 mm, and its area is 400-1500 mm2. Upon the ceramic substrate , there is printed PbAg, PtAg, Ag or their combination paste. Then the printed substrate is baked at a temperature of about 800° C., and thus, a printed circuit board is formed, and then lead wires are soldered. Then RuO2 is printed thereupon, and then the structure is baked at a temperature of about 850° C. Thus a resistor having a certain thickness is completed.

Meanwhile, in this resistor, electric current can flow only if the electrical resistance per unit length of the resistor is smaller than the air contact electrical resistivity. In the case where the voltage breakdown resistivity of air is 0.5 KV/mm, if a voltage of 20 KV is supplied across a resistor 12, there has to be secured a distance of 20 KV÷0.5 KV/mm=40 mm. Further, if the thermal degradation and the environmental factors are taken into account, then the safe distance must be 1.8 times as large as the above distance, that is, 40 mm×1.8=72 mm. Meanwhile, in the case where the resistor 12 is printed on the ceramic substrate 10 in a straight line, the length of the ceramic substrate has to be longer, with the result that the total bulk of the ceramic substrate becomes too large.

The screen voltage is approximately the same for all tubes (in the order of 250 to 350V or 500 to 800V). Both voltages are provided by voltage dividers and high value potentiometers because they are directed to grids in the tube that do not consume current. As you can see, the circuit is simply a series of two high voltage potentiometers and two high voltage resistors connected between the pacifier output and ground. In figure above I draw the focus pack circuit only with the characteristic voltages and resistances, which are practically the same (or at least proportional) for all the equipment.


The resistance values are high enough that it is impossible to measure them with a digital or analog tester. It is even impossible to measure the voltages at the focus and screen outputs without altering their value. And they're prone to defects such rising in values or dropping value.

Now that we know the circuit let's start with the replacement work. As the fly-back has two sections we must analyze the failures of both sections separately starting with the fly-backs that have problems in the focus pack.

The most common fault is a dark screen despite the existence of high voltage. A high voltage tip should really be used for the tester if we want to be sure of the existence of the 25KV of AT but generally the test of measuring the screen voltage with the potentiometer at maximum is usually enough to verify that there is high voltage.

The ideal is to use the focus pack of a disused fly-back  Transformer set on a 20" TV that works well to indicate 250V on the screen output by adjusting the potentiometer. Without much error you can interpret that this test TV is 25 KV and already has a high voltage attenuator set that you must connect to the pacifier of the TV under test with an alligator clip that will be covered by the pacifier so that no arcs are produced.

If there is good high voltage and the screen is dark the problem may not be in the fly-back  Transformer. The most basic thing is to see if the tube filament is on and measure the screen voltage if you have not already measured it. If both things are OK, you should measure the focus voltage, with a high voltage tip that has a resistance greater than 200 MOhms.

The measurement with instruments is not dangerous for the circuit, because the focus source is of high impedance. 

At the time when indicated to connect the three cathodes to earth briefly  with resistors of 150KOhms and to return to test if the screen illuminates the problem is in the video card or the jungle.

But if the problem is in the focus pack you don't need to change the whole fly back. Transformer In specialized stores they sell focus packs ready to be connected to the pacifier that generate the focus and screen voltage. Cut the cables of the damaged focus pack, connect the new ones and test. You can also use a fly-back that has a damaged winding. This case is specific with external HT bleeders where the focus voltage is obtained from.


  If the problem is in the winding section of the fly-back Transformer  the first thing to do is to check the operation of the stage with the simulated fly-back instrument. Connect it replacing the primary and measure the collector oscillogram with low source voltage (for example 10% of the nominal value); if you do not have an oscilloscope, try it with the horizontal output detector (a RF detector probe) which can be lowered free of charge from and if the delay voltage has a normal value of about 80V, pass gradually to higher source values until the nominal value is reached.
    If everything is normal, try connecting only the primary of the fly-back Transformer supposedly damaged. This means that you must disconnect all the auxiliary diodes, including the HV pacifier, and try again, starting with a source voltage of 10% of the nominal value, until you reach 100%. If everything is OK, the problem is not in the fly-back Transformer but in some of the auxiliary circuits. Connect the auxiliary diodes one by one and always perform the same test starting from 10% of the source voltage until the damaged auxiliary circuit is discovered. Note: Although unlikely, consider that there may be more than one damaged auxiliary circuit. 

TAKE NOTE THAT THE'RE MAY A SPECIFIC PROTECTIVE TV CIRCUIT THAT WILL STOP THE HORIZONTAL OUTPUT IF IT IS NOT WORKING PROPERLY AND ALSO SOME  TV POWER SUPPLY VOLTAGE MAY NOT WORK PROPERLY IF THE HORIZONTAL OUTPUT IS NOT WORKING PROPERLY DUE TO A FLY-BACK TRANSFORMER WHICH MAY BE DEFECTIVE.

AS EXAMPLE:

In a typical switch mode power supply (SMPS) of a television receiver the AC mains supply voltage is coupled, for example, directly, and without using transformer coupling, to a bridge rectifier. An unregulated direct current (DC) input supply voltage is produced that is, for example, referenced to a common conductor, referred to as "hot" ground, and that is conductively isolated from the cold ground conductor. A pulse width modulator controls the duty cycle of a chopper transistor switch that applies the unregulated supply voltage across a primary winding of an isolating flyback transformer. A flyback voltage at a frequency that is determined by the modulator is developed at a secondary winding of the transformer and is rectified to produce a DC output supply voltage such as a voltage B+ that energizes a horizontal deflection circuit of the television receiver. The primary winding of the flyback transformer is, for example, conductively coupled to the hot ground conductor. The secondary winding of the flyback transformer and voltage B+ may be conductively isolated from the hot ground conductor by the hot-cold barrier formed by the transformer.

It may be desirable to synchronize the operation of the chopper transistor to horizontal scanning frequency for preventing the occurrence of an objectionable visual pattern in an image displayed in a display of the television receiver.

It may be further desirable to couple a horizontal synchronizing signal that is referenced to the cold ground to the pulse-width modulator that is referenced to the hot ground such that isolation is maintained.

A synchronized switch mode power supply, embodying an aspect of the invention, includes a transformer having first and second windings. A first switching arrangement is coupled to the first winding for generating a first switching current in the first winding to periodically energize the second winding. A source of a synchronizing input signal at a frequency that is related to a deflection frequency is provided. A second switching arrangement responsive to the input signal and coupled to the second winding periodically applies a low impedance across the energized second winding that by transformer action produces a substantial increase in the first switching current. A periodic first control signal is generated. The increase in the first switching current is sensed to synchronize the first control signal to the input signal. An output supply voltage is generated from an input supply voltage in accordance with the first control signal.

But if everything indicates that the problem is in the fly-back Transformer and the fly-back is not achieved, then we must find a fly-back Transformer as similar as possible (better original)  to ours and perform a very simple test. Make a 2 or 3 turns winding in any open place of the core by connecting one end of the winding to ground. If you have an oscilloscope, connect it over the added winding to raise the oscillogram; otherwise, connect the rewind pulse detector indicated above to a tip of the winding and then invert it to find both the positive and negative value of the signal. Connect only the primary of the new fly-back and run it at the nominal voltage.

 The oscillogram obtained will be similar to the one in figure: 

The oscillogram could appear inverted since we made our coil with any direction. If it appears inverted, change the ground connection to live. The most important thing is that you measure the peak pulse value of the signal, which in our case is 23.8V. If this voltage corresponds to three turns, calculate the value of voltage per turn as 23.8/3 = 7.9 V/turn.

If you don't have an oscilloscope, you can use the audio probe for the tester (A RF detector probe)  that will indicate directly the  value of the signal or make the double measurement with the delay detector.

Now we have to start modifying the auxiliary voltages of our substitute fly-back  Transformer if necessary. Let's start with the filament voltage. Observe the circuit of the substitute fly-back to find the ground leg and connect it to ground. Now measure the other auxiliary legs and note the peak to peak values. The filament should have a  peak pulse voltage of about 22 or 23 V. Do not try to measure the RMS voltage with a common tester or with the peak value probe. None of the classic instruments will show a peak pulse value of 6.3V. It is best to calculate the RMS value as a function of the peak-to-peak value for a delay time of 12 uS, which is what we did to indicate the correct peak value of 22.5V.

It is very likely that by changing the number of turns you will not be able to achieve the exact value. In that case you should calculate the excess turns and then adjust the resistor  value to get 22.5V on the filament. In our case you can test the voltage value of the filament winding and if it is close to the indicated one modify the value of resistor .

Is it very important that this voltage value is accurate? Yes, but a fluctuation of 1V cannot shorten the life of the tube but it's better avoided. The filament of a tube is far from the melting point, i.e. it is undervolted to increase the life to a value far above the cathode depletion but also better avoided.

Adjusting a Running Auxiliary Voltage

Let's suppose that the winding for the vertical voltage has to give 25V and gives 18. We measure that our fly-back has 7.9 V peaks per turn. For a delay time like the one indicated, the relationship between the positive semicircle and the peak value taken from the oscillogram in figure 30.4.3 is 3,07/23,8=0,13. This means that each turn adds a voltage of 3.67V to the rectified voltage and that to go from 18 to 25 you have to add approximately two turns (7.34V+18 = 25.34V). Without an oscilloscope, I have to add the two turns  and measure a voltage of 3.67/0.13= 28.2V with the peak probe. Now, I must cut the printed circuit and connect from the fly-back leg a wire that must pass twice inside the core and solder it to the cut track on the side of the diode.

Note: the direction of the winding is impossible to determine a priori, the most advisable thing to do is to choose any and measure if the voltage has the correct value. If not, the winding or connections must be reversed.

In this way all windings must be corrected, so that the fly-back is ready to perform a final test with everything connected.

But the auxiliary voltages are not all that differentiate one fly-back from another. In the next delivery we will explain how to perform the final test without burning anything in the attempt, and that should be changed if the width is not correct.