Service manual
31
VL-WD250U
VL-WD450U
(Wiring board diagram: Main Side B)
1
6
C
1720
C
1718
T
L1702
TL1902
TL1906
TL1905
TL1904
TL1907
TL1903
TL1901
R1714
R1713
Q1701
C1728
TL3329TL3315TL3370
TL3341
TL3336
TL3355
TL3320
TL3330
TL3319
TL3351
TL3354
TL3327
TL3328
TL4440
TL3353
TL3325
TL3326
TL3356
TL3323
TL3324
TL3358
TL3321
TL3322
TL4436
TL3360
TL3318
TL3363
TL3362
TL3317
TL3316
TL3368
TL3346
TL3314
R3499
TL3313
TL3312
TL3348
TL3309
TL3372
TL3373
Q3405
TL3377
TL3311
TL3374
TL3375
TL3302
TL3304
R3494
TL3380
TL3378
TL3306
C3462
R3475
R3474
R3495
TL3379
TL3307
R3411R3410C3414
C3420
C3417
C3419
R3470
C3418
C3416
C3415
C3411
R3414
R3409
R3413
C3413
R3430
C3412
C3409
R3434
C3410
R3407
C3408
R3406
R3442R3404
C3406
Q3401
C3465
R3441
C3403
C3405
C3401
FL3401
R3496
L3401
C3443
R3401
R3489Q3406
C3442
R7847
TL3344
C7816
R7858
R4403
TL3338
R7857
L7801
C4403
R7856
C7813R7827
C7850
R7860
IC7801
R7859
TL3366
TL4438
C7808
C7810
C7811
C7822
C7821
C7807
TL4437
TL4439
R7804
R7805
R7811
C7804
R7810
R7803
TL3364
R7813
C7806
R7807
C7802
R7808
R7809
R7806
TL3365
R7802
R7814
R7812
C7805
C4417
R7801
R7800
TL3350TL3345
C4430
C7800
C4401
L7800
R4414
C4421C4419
R4401
C4410
L4402
TL1925
L4401
TL4415
C4413
R4450
R4412
C4404
TL3371
IC4471
TL7823
TL4405
Q4440
C4440
C4402
R4441
TL3343
C4441
TL4404
R4418
R4402
R1725
R4416
R4440
R4430R4427
R1726
R1727
R1728
IC4472
C4409R4419
R4417C4408
R1723
R1724
R1720
R1733
R1734
R1721
R1708
R1709
TL1701
TL1915
Q1401
TL1917
R1711
R1710
C1708
R1707
R1704
R1451
C1704
L1702
C
1712
C
1710
C1416
C
1717
C
1714
1
452
L
1431
R
1442
C1409
C1404
C1414
R1454
C1436
C1410
D1402
Q1434
C1408
C1413
R4487
C1405
R4429R4499
R4420
R4423
C4406
R4436
Q4482
R4426
R4421C4407
TL4403
TL8800
R4422
R4443
R4442R4437
R4488
Q4442
Q4441
Q4433
Q4434
C4405
R4425
C4436
R4413
R4410
R4408
R4406
R4407
R4405
R4404
R4415
C4411
R4435
R4411
R4409
C4435
C4412
C4472
C4482
TL4416
C4420
C4422
R4475
TL4417
C4423
C4426
IC4401
C4427
C4451
TL4434
R4451
R4452
TL4433TL4435
R4456
TL4428
TL4429
C4431
R4494
D7800
C7815
C7842C4432
C7841
R7851
C4454
C7843
L4451
C7837
R7841
R7852
R7843
R7855
R7854
R4454
D4452
TL7800
C7844
C3402
C625
R3402
C3425
L3402
R631
C631
R638
R3415
R3418
C3478
R636
C645
R3417
R654
FL3403
R3416
C639
C605
TL558
R670
TL562
TL564
TL565
TL568
TL567
TL551
C640
C632
C633
TL566
TL552
C634
TL569
TL556
TL4451
R4466
R4461
C4462
R4462
C4465
R4465
R4453
IC4461
Q4462
R4464
R4469
X4451
Q4461
R4460
TL28
C4466
C4463
R4463
C4464R4468
TL23
R4467
D4451
L4461
R4473
C4461
L601
Q4471
R4478
R4474
C4424
R4477
Q4431
L4481
Q4472
Q4432
C218
R4424
R4428
R4486
C4483
C215
Q4481
R4485
C4485
C4481
R1438
C1432
R1432R1431
TL207
R1439
C212
R1440
Q1432
C1437
441
434
R214
R213
R217
IC202
R215
R207
C214 R219
TL209
C217
TL211
TL212
TL210
C220
TL38
TL22
TL33
TL25
L101
C641
TL29
TL27
TL26
TL36
TL34
TL32
TL31
TL30
TL24
TL21
TL37
TL35
TL8833
TL8835
TL8849
TL8847
TL8845
TL8843
TL8831
TL8860
TL8842
TL8840
TL8838
TL8836
TL8834
TL8832
C204
TL8844
C202
IC201
TL208
R203
R204
R218
R205R209
2
08
TL8846
TL8848TL8841
TL8837
TL8839
TL8840(HST)
VF VCO
TL8847(COM)
VF COM-DC
TL8844(VB)
VF sub-contrast R/B
VF sub-brightness R/B
TL8846(VG)
VF COM-DC
VF brightness
VF contrast
VFγ1
VF sub-contrast R/B
VF sub-brightness R/B
TL8845(VR)
VF sub-contrast R/B
VF sub-brightness R/B
TL8800(VF-Y)
VF VCO
2. VF VCO adjustment
Test point TL8840(HST) Address VCR ADJ E1
Mode VCR AV input
Procedure 1) Connect TL8800 to GND. (No signal)
2) Connect TL8840 to the frequency counter, and adjust the DC voltage value to the specified adjustment value
with the VCR ADJ E1.
Adjustment 15.734 ± 0.1KHz
rating
Examples • During IC703 or IC8802 replacement.
3. VF COM-DC adjustment
Test point TL8847(COM) Address VCR ADJ F6
Mode VCR AV input
Procedure 1) Input the signal of a 3-step waveform.
2) Read the DC voltage value of the output of TL8846 with the digital voltmeter. (VG
DC
)
3) Similarly rad the DC voltage value of the output of TL8847 with the digital voltmeter. (VCOM
DC
)
4) Adjust the value of (VCOM
DC
- VG
DC
) to the specified adjustment value.
Adjustment -0.15 ± 0.1V
rating
Examples • During IC703 or IC8802 replacement.
4. VF brightness adjustment
Test point TL8846(VG) Address VCR ADJ E0
Mode VCR AV input
Procedure 1) Input the signal of a 3-step waveform.
2) Set VCR ADJ ED to 00.
3) Adjust the waveform pedestal range of TL8846 to the specified adjustment value.
4) Return VCR ADJ ED to the initial value. (Initial value: 7A)
Adjustment 7.4Vp-p ± 0.1Vp-p
rating
Examples • During IC703 or IC8802 replacement.
Sig. center
7.4Vp-p 0.1Vp-p
GND