LOPT - FLYBACK EHT TRANSFORMER COMPARATION TABLE ORIGINAL ---> HR DIEMEN SPARE PART LIST 8

LOPT - FLYBACK EHT TRANSFORMER COMPARATION TABLE ORIGINAL ---> HR DIEMEN SPARE PART LIST 8

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
8 324 800 038	HRT 904
8 327 105 495	HR 6300
8 619 139 229	HR 7592
8 627 000 311	HR 6311
8 627 000 841	HR 6311
8 627 000 842	HR 6312
8 627 000 843	HR 6313
8 627 000 845	HR 6315
8 627 002 444	HR 5126
8 627 002 467	HR 2082
8 627 105 490	HR 6320
8 627 105 491	HR 6321
8 627 105 492	HR 6322
8 627 105 493	HR 6323
8 627 105 494	HR 6324
8 627 105 495	HR 6300
8 627 105 496	HR 6301
8 627 105 497	HR 6302
8 627 105 498	HR 6304
8 627 105 499	HR 6349
8 627 105 500	HR 6305
8 627 105 501	HR 6307
8 627 105 502	HR 6309
8 627 105 503	HR 6316
8 627 105 504	HR 6317
8 627 105 505	HR 6319
8 627 140 499	HR 6349
8 627 210 435	HR 6328
8 634 260 500	HR 8589
8 664 490 085	HR 1671
8 664 490 086	HR 1671
8 664 490 385	HR 1670
8 664 490 44.	HR 1660
8 664 490 440	HR 1673
8 664 490 447	HR 1661
8 664 490 507	HR 1661
8 664 490 585	HR 1661
8 664 490 607	HR 1661
8 664 490 716	HR 1662
8 664 490 789	HR 1673
8 667 133 201	HR 2175
8 667 210 001	HR 3616
8 667 210 002	HR 3615
8 667 210 067	HR 2467
8 667 210 068	HR 2110
8 667 210 069	HR 2169
8 667 210 082	HR 2082
8 667 210 110	HR 2114
8 667 210 111	HR 2111
8 667 210 112	HR 2110
8 667 210 113	HR 2467
8 667 210 114	HR 2114
8 667 210 115	HR 2111
8 667 210 116	HR 3511
8 667 210 117	HR 2458
8 667 210 118	HR 2118
8 667 210 141	HR 2169
8 667 210 150	HR 2459
8 667 210 152	HR 2152
8 667 210 155	HR 2155
8 667 210 158	HR 1130
8 667 210 172	HR 9672
8 667 210 173	HR 9613
8 667 210 174	HR 9610
8 667 210 179	HR 9613
8 667 210 214	HR 5705
8 667 210 241	HR 2141
8 667 210 242	HR 2118
8 667 210 243	HR 2143
8 667 210 244	HR 2440
8 667 210 245	HR 2450
8 667 210 247	HR 5165
8 667 210 262	HR 2467
8 667 210 310	HR 6310
8 667 210 311	HR 6311
8 667 210 312	HR 6312
8 667 210 313	HR 6313
8 667 210 314	HR 6314
8 667 210 315	HR 6315
8 667 210 350	HR 9610
8 667 210 351	HR 9621
8 667 210 354	HR 9616
8 667 210 355	HR 9625
8 667 210 356	HR 9616
8 667 210 359	HR 9609
8 667 210 374	HR 2460
8 667 210 376	HR 2461
8 667 210 390	HR 9690
8 667 210 400	HR 6320
8 667 210 401	HR 6321
8 667 210 402	HR 6322
8 667 210 403	HR 6323
8 667 210 404	HR 6324
8 667 210 420	HR 6303
8 667 210 421	HR 2141
8 667 210 422	HR 6020
8 667 210 431	HR 6005
8 667 210 432	HR 6349
8 667 210 433	HR 6327
8 667 210 434	HR 6328
8 667 210 435	HR 6328
8 667 210 450	HR 2445
8 667 210 470	HR 6300
8 667 210 471	HR 6301
8 667 210 472	HR 6302
8 667 210 473	HR 6304
8 667 210 495	HR 9695
8 667 210 520	HR 6305
8 667 210 520 P 002	HR 6340
8 667 210 520 P 102	HR 6330
8 667 210 520/730	HR 6330
8 667 210 521	HR 6326
8 667 210 522	HR 6307
8 667 210 522 P 002	HR 6342
8 667 210 522 P 102	HR 6332
8 667 210 522/730	HR 6332
8 667 210 523	HR 6308
8 667 210 523 P 002	HR 6343
8 667 210 523 P 102	HR 6333
8 667 210 524	HR 6309
8 667 210 524 P 002	HR 6344
8 667 210 524 P 102	HR 6334
8 667 210 524/730	HR 6334
8 667 210 525	HR 6316
8 667 210 525 P 002	HR 6345
8 667 210 525 P 102	HR 6335
8 667 210 527	HR 6325
8 667 210 528	HR 6317
8 667 210 528 P 002	HR 6346
8 667 210 529	HR 6319
8 667 210 529 P 002	HR 6348
8 667 210 630	HR 9663
8 667 210 805	HR 6309
8 667 210 806	HR 6306
8 667 210 806 P 002	HR 6341
8 667 210 806 P 102	HR 6331
8 667 210 808	HR 6318
8 667 210 808 P 002	HR 6347
8 667 210 868	HR 9547
8 667 246 356	HR 6321
8 667 433 212	HR 5707
8 667 434 207	HR 5707
8 667 434 520	HR 6330
8 668 210 201	HRT 202
8 668 210 203	HRT 505
8 668 485 075	HR 6573
8 668 500 100	HRT 202
8 668 810 002	HRT 507
8 668 810 200	HRT 202
8 668 810 201	HRT 202
8 668 810 202	HRT 205
8 668 810 203	HRT 205
8 668 810 205	HRT 242 BP
8 668 810 400	HRT 202
8 668 810 560	HRT 202
8 668 810 561	HRT 202
8 668 810 562	HRT 205
8 668 810 563	HRT 205
8 668 810 574	HRT 216 A
8 668 810 710	HRT 205
8 668 810 711	HRT 205
8 668 810 712	HRT 205
8 668 810 715	HRT 218 B
8 668 810 890	HRT 205
8 668 810 990	HRT 202
8 668 811 130	HRT 205
8 669 133 201	HR 2175
8 669 133 211	HR 2175
8 669 143 600	HRT 202
8 669 433 072	HRT 906
8 669 433 200	HR 5705
8 669 433 202	HR 5703
8 669 433 205	HR 5717
8 669 433 207	HR 5707
8 669 433 208	HR 5705
8 669 433 209	HR 5713
8 669 433 212	HR 5707
8 669 433 213	HR 5719
8 669 433 214	HR 5705
8 669 433 260	HR 6503
8 669 433 274	HR 6504
8 669 433 403	HRT 903
8 669 433 405	HRT 904
8 669 433 410	HRT 910
8 669 434 202	HR 5703
8 669 434 402	HRT 902
8 669 435 201	HR 6501
8 669 435 203	HR 5721
8 669 435 205	HR 5711
8 669 435 208	HR 5717
8 669 435 211	HR 5718
8 669 435 213	HR 5722
8 669 435 216	HR 5720
8 669 435 220	HR 6500
8 669 435 222	HR 6502
8 669 435 246	HR 6501
8 669 435 256	HR 5729
8 669 435 260	HR 6503
8 669 435 274	HR 6504
8 669 435 284	HR 6501
8 669 435 285	HR 6511
8 669 435 288	HR 5726
8 669 435 295	HR 5730
8 669 435 299	HR 6510
8 669 435 416	HRT 911
8 669 435 422	HRT 251
8 669 435 432	HRT 248 BP
8 669 435 448	HRT 250
8 669 443 405	HRT 904
8 669 443 410	HRT 906
8 669 485 028	HR 6512
8 669 485 030	HR 6506
8 669 485 034	HR 6514
8 669 485 043	HR 6513
8 669 485 049	HR 6518
8 669 485 052	HR 6509
8 669 485 057	HR 5734
8 669 485 060	HR 6572
8 669 485 065	HR 5725
8 669 485 069	HR 6522
8 669 485 073	HR 6573
8 669 485 075	HR 6573
8 669 485 078	HR 6520
8 669 485 080	HR 6580
8 669 485 085	HR 6587
8 669 485 087	HR 6586
8 669 485 092	HR 6519
8 669 485 202	HRT 402
8 669 485 203	HRT 404
8 669 485 204	HRT 400
8 669 485 205	HRT 402
8 669 485 328	HR 6505
8 669 485 338	HR 6574
8 669 485 341	HR 5727
8 669 485 346	HR 7292
8 669 495 049	HR 6518
8 677 210 068	HR 2110
8 677 210 082	HR 2082
8 677 210 374	HR 2460
8 677 210 376	HR 2461
8 677 210 450	HR 2445
8 678 210 572	HRT 201
8 678 810 205	HRT 242 BP
8 678 810 211	HRT 202
8 678 810 400	HRT 202
8 678 810 572	HRT 205
8 678 810 574	HRT 205
8 678 840 572	HRT 201
8-598-803-00	HR 8372
8-598-803-10	HR 8372
8-598-811-00	HR 8662
8-598-811-10	HR 8662
8-598-818-00	HR 8187
8-598-818-10	HR 8187
8-598-822-00	HR 8520
8-598-822-01	HR 8520
8-598-823-00	HR 8655
8-598-824-10	HR 8534
8-598-825-00	HR 8592
8-598-825-10	HR 8592
8-598-825-20	HR 8592
8-598-831-00	HR 8577
8-598-831-01	HR 8577
8-598-833-00	HR 8663
8-598-833-20	HR 8663
8-598-834-10	HR 8579
8-598-834-20	HR 8579
8-598-834-30	HR 8579
8-598-834-40	HR 8579
8-598-834-50	HR 8579
8-598-836-00	HR 8580
8-598-836-01	HR 8580
8-598-836-02	HR 8580
8-598-838-00	HR 7946
8-598-838-01	HR 7946
8-598-838-40	HR 7946
8-598-843-00	HR 8175
8-598-844-00	HR 8182
8-598-848-00	HR 8635
8-598-850-00	HR 8774
8-598-851-10	HR 8638
8-598-851-20	HR 8638
8-598-851-40	HR 8638
8-598-851-50	HR 8638
8-598-852-00	HR 7979
8-598-852-01	HR 7979
8-598-855-00	HR 8567
8-598-922-00	HR 7391
8-598-925-00	HR 8807
8-598-928-00	HR 8293
8-598-928-01	HR 8293
8-598-928-11	HR 8293
8-598-938-00	HR 7391
8-598-942-00	HR 8807
8-598-951-00	HR 7973
8-598-951-01	HR 7973
8-598-951-02	HR 7973
8-598-952-00	HR 7762
8-598-952-01	HR 7762
8-598-952-10	HR 7762
8-598-952-30	HR 7762
8-598-952-40	HR 7762
8-598-959-00	HR 8172
8-598-959-01	HR 8172
8-598-959-02	HR 8172
8-598-961-00	HR 8208
8-598-968-00	HR 46202
8-598-968-01	HR 46202
8-598-968-10	HR 46202
8-598-969-00	HR 8193
8-598-976-00	HR 8578
8-598-986-00	HR 8566
8-598-986-10	HR 8566
8-598-988-00	HR 7364
8-598-989-00	HR 7337
8-598-989-01	HR 7337
8-598-992-00	HR 8211
8-598-994-00	HR 8569
8-598-994-10	HR 8569
8-598-994-20	HR 8569
8-598-998-00	HR 8220
80 004 008	HR 42029
80 004 08	HR 42029
80 004 11	HR 42007
80 004 13	HR 42016
80 66 1900	HR 7140
8008 023 500	HR 3670
8013414	HR 7503
8014054	HR 6078
8014066	HR 6070
8014073	HR 6212
8014080	HR 6036
8014084	HR 6356
8014087	HR 7319
80140897	HR 7321
8014094	HR 6259
8014097	HR 7321
8014123	HR 6469
8014196	HR 8731
80231500	HR 7275
802927.00	HR 7140
8035 020 074	HRT 227 BP
8038-00	HR 8038
804073.31	HR 7176
8042-00	HR 8042
80420000011	HR 7537
804200000211	HR 7537
804484.60	HR 6272
8065621350	HR 8624
8066 1900	HR 7140
81 TRNS FB 1061 A	HR 46077
810.11030	HR 2268 TRSI
8100 020 002	HR 6036
8100 020 070	HR 6020
8100 020 071	HR 6020
8100 020 073	HR 6137
8100 020 074	HR 5642
8100 020 075	HR 3643
8100 020 078	HRT 227 BP
8100 020 080	HR 6021
8100 020 081	HR 3643
8100 020 082	HR 6020
8100 020 085	HR 6036
81000 200 70	HR 6020
81000 500 60	HR 2051
81050060	HR 2051
8110 020 078	HRT 227 BP
8110 024 400	HR 6114
8110 244 00	HR 6114
8114 024 100	HR 6024
8115 020 085	HR 6024
8115 021 300	HR 6036
8115 023 600	HR 5638
8115 024 000	HR 6024
8115 024 001	HR 6024
8115 024 100	HR 6024
8115 024 200	HR 6024
8115 024 400	HR 6114
8115 024 401	HR 6024
8115 024 500	HR 6024
8115 024 502	HR 6024
8115 024 800	HR 6036
8115 034 500	HR 6024
8118 524 400	HR 6024
812100/01	HR 185
812100/1	HR 185
812140/01	HR 185
8140.601.273	HR 2101
8155 023 600	HR 5638
817119	HR 7491
8172 A	HR 3054
8172 G	HR 3054
818801	HR 7443
81909722	HR 052
81925512	HR 046
81928872	HR 046
82-0205-5	HR 2130
82-0205-55	HR 2130
82-0209-7	HR 1730
82-205-7	HR 2130
82-207-8	HR 2266 R
82-209-7	HR 1730
82-502-7	HR 2130
8204 000 70371	HR 8563
8204 000 73081	HR 8449
8206 270 07171	HR 7662
8206 270 07181	HR 7650
8206 270 08021	HR 7650
8206 270 08031	HR 7662
8207 100 11721	HR 46075
822093/5W 18 CE	HR 1730
8222 280 05627	HR 2049
8222 280 06590	HR 2045
8222 280 06598	HR 2045
822403	HR 8621
8228 001 09261	HR 7704
8228 001 33243	HR 8457
8230 090 00301	HR 1610
8230 090 07174	HR 7442
8230 090 07400	HR 9463
8230 090 07401	HR 9463
8230 090 07402	HR 9463
823006	HR 7728
8239 121 19730	HR 7527
824 TX 0143	HR 1683
824404	HR 7918
826 390 6	HRT 202
83237.00	HR 9206
83238.00	HR 9216
83238.01	HR 9216
83238.50	HR 9215
8324.000.040	HRT 906
8324.800.003	HRT 507
8324.800.004	HRT 507
8324.800.005	HRT 507
8324.800.008	HRT 507
8324.800.017	HRT 246 BS
8324.800.023	HRT 240 BS
8324.800.024	HRT 263
8324.800.029	HRT 902
8324.800.030	HRT 209
8324.800.032	HRT 250
8324.800.034	HRT 250
8324.800.035	HRT 248 BP
8324.800.036	HRT 251
8324.800.037	HRT 903
8324.800.038	HRT 904
8324.800.040	HRT 906
8324.800.044	HRT 910
8324.800.045	HRT 911
8324.800.047	HRT 920
8324.800.050	HRT 901
8324.800.051	HRT 902
8324.800.052	HRT 234 BP
8324.800.053	HRT 254
8324.800.055	HRT 910
8324.800.058	HRT 230 BP
8324.800.060	HRT 235 BP
8324.800.061	HRT 234 BP
8324.800.086	HRT 208
8324.800.087	HRT 208
8324.800.134	HRT 250
8324.800.186	HRT 218 B
8324.800.187	HRT 218 B
8324.800.189	HRT 234 BP
8324.800.198	HRT 263
8324.800.308	HRT 400
8324.800.310	HRT 400
8324.800.325	HRT 402
8324.800.326	HRT 402
8324.800.329	HRT 404
8324.801.055	HRT 910
8324.801.071	HRT 903
8324.801.073	HRT 900
8324.801.077	HRT 905
8324.803.117	HRT 234 BP
8324.803.124	HRT 234 BP
83242.00	HR 9204
83242.01	HR 9204
83244.00	HR 1804
83516.00	HR 18516
83516.01	HR 18516
83526.00	HR 18526
83542.00	HR 1843/34
83592.00	HR 1843/87
83594.00	HR 1843/38
83608.00	HR 1808
83610.00	HR 1810
83610.01	HR 1810
83611.00	HR 1811
83616.00	HR 1816
83636.00	HR 1863
83647.00	HR 8647
83647.01	HR 8647
83650.00	HR 1815
83659.00	HR 9208
83659.01	HR 9208
83668.00	HR 1868
83673.00	HR 1858
83685.00	HR 19027
83685.01	HR 19027
83705.00	HR 1832
8391 320 300	HR 7112
8391 620 100	HR 7042
8391 621 000	HR 7035
8393 810 300	HR 6165
84000591643	HR 8374
84230024	HR 5564
84230034	HR 2279 T4S
84230036	HR 5576
84230039	HR 5642
84230040	HR 5638
84230137	HR 6036
84230150	HR 7043
84230204	HR 6021
84230207	HR 6024
84230212	HR 6103
84230213	HR 7008
84230214	HR 7042
84230215	HR 6103
84230216	HR 6024
84230217	HR 7099
84230227	HR 6024
84230241	HR 7127
84230243	HR 7159
84230252	HR 7140
84230265	HR 6245
84230266	HR 6260
84230282	HR 7233
84230310	HR 6399
843	HR 2268 TRSI
8432.800.053	HRT 254
84330036	HR 9647
8433036	HR 9647
8493 803 500	HR 6067
8493 803 501	HR 6067
8493 803 502	HR 6067
8493 804 100	HR 6075
8493 809 200	HR 6067
8493 809 300	HR 6075
8493 810 300	HR 6165
85-0313-3	HR 1730
85-0335-4	HR 2230
85-0445-8	HR 2130
85-1264-7	HR 2080/10
85-1871-8	HR 5566
85-3176-5	HR 5601
85-3878-6	HR 6028
85-9616-6	HR 6552
85-9835-5	HR 6237
85-9845-2	HR 7162
85-9846-0	HR 7163
85-9986-6	HR 1563
8503	HR 7122
8514143	HR 6450
8518603	HR 7519
85294.00	HR 1367 T5
859883400	HR 8579
8602 141 10163	HR 7442
8602 141 11163	HR 7442
8602 141 91163	HR 7442
8602 142 11161	HR 7442
8602 142 21161	HR 7442
8602 142 21164	HR 7442
8602 142 41161	HR 7442
8602 142 41162	HR 7442
8602 143 11081	HR 7442
8602 143 11161	HR 7442
8602 143 31081	HR 7442
8602 143 31161	HR 7442
8602 143 52191	HR 7442
8603 141 11161	HR 7442
8604 141 10163	HR 7442
8604 141 11163	HR 7442
8604 141 31163	HR 7442
8604 142 42021	HR 7442
8604 142 42022	HR 7442
8605 141 11163	HR 7442
8606 143 11021	HR 7442
8606 143 11051	HR 7442
8606 143 11081	HR 7442
8606 143 30051	HR 7442
8606 143 31021	HR 7442
8606 143 31081	HR 7442
8607 140 11081	HR 7442
8607 140 21082	HR 7442
8607 141 11081	HR 7442
8607 141 21081	HR 7442
8607 141 21082	HR 7442
8607 141 31081	HR 7442
8607 144 11081	HR 7442
8607 144 31081	HR 7442
8608 141 11163	HR 7442
8608 141 12023	HR 7442
8608 141 12101	HR 7442
8609 141 12101	HR 7442
8610 141 14021	HR 7442
8610 141 31021	HR 7442
8611 141 10051	HR 7442
8611 141 30051	HR 7442
8612 145 10161	HR 7442
86151-6 F 3981-7 DB	HR 42069
86189	HR 9517
8632116000	HR 8770
866 1900	HR 7140
8667 210 520/730733	HR 6330
8667 210 520/730975	HR 6340
8667 210 522/730733	HR 6332
8667 210 522/730975	HR 6342
8667 210 524/730733	HR 6334
8667 210 524/730975	HR 6344
8670 000 00863	HR 7442
8670 000 00865	HR 7442
8670 000 00868	HR 7442
8670 000 00872	HR 7442
8670 000 00873	HR 7442
8670 000 00874	HR 7442
8670 000 01207	HR 7442
8670 000 01447	HR 7442
8670 000 01452	HR 7442
8670 000 01454	HR 7442
8670 000 01986	HR 7442
8670 000 02017	HR 7442
8670 000 02136	HR 7442
8670 000 02137	HR 7442
8670 000 02542	HR 7442
8670 000 0872	HR 7442
8670 141 11081	HR 7442
8670 144 31081	HR 7442
8675 222 27051	HR 7527
8675 222 27101	HR 7527
8680 222 21021	HR 7527
8680 222 21030	HR 7527
8680 222 21031	HR 7527
8680 222 21033	HR 7527
8680 222 21081	HR 7527
8680 222 21111	HR 7527
8680 222 21161	HR 7527
8680 222 21251	HR 7527
8680 222 22161	HR 7527
8680 222 23281	HR 7527
8680 222 23361	HR 7527
8680 222 24051	HR 7527
8680 222 28141	HR 7527
87-0016-8	HR 7162
87-0313-2-001	HR 8488
870	HR 2280 T8S
8700402098	HR 7335
8700402100	HR 7567
8700402109	HR 7588
8700402112	HR 6591
8700402113	HR 7250
8700402131	HR 7250
8700402140	HR 8047
8700482113	HR 7250
87020	HR 7259
87021	HR 7259
87022	HR 7259
87023	HR 7259
87024	HR 7259
870310	HR 502
8719131000	HR 7061
8750	HR 3615
8752	HR 5126
88 464500010	HR 42072
8800.0060/2	HR 1883
8800.0068/4	HR 9410
8800.0080/1	HR 1885
8800.0083/5	HR 9409
880110	HR 185
88021	HR 46116
8804.0056	HR 6010
8804.0059/1	HR 6010
8804.0061/7	HR 7119
8804.0062/6	HR 7512
884-82870	HR 6063
884-82950	HR 6063
884-83100	HR 6063
884-83110	HR 6063
884-83400	HR 6100
884-83400.019	HR 6100
884-83410	HR 6063
884-83700	HR 6100
884-90402	HR 6100
88502.00	HR 1912
88520.00	HR 1910
88520.01	HR 1910
88536.00	HR 1918
88556.00	HR 1939
88700402086	HR 6228
88700402098	HR 7335
88700402100	HR 7567
88700402101	HR 9400
88700402107	HR 7297
88700402108	HR 7290
88700402109	HR 7588
88700402112	HR 6591
88700402113	HR 7250
88700402122	HR 46146
88700402127	HR 6591
88700402131	HR 7250
88700402140	HR 8047
88700402153	HR 7856
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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.