Adjustment Of Lcd Circuit; Adjustment Of Dac Full Scale (Main Pwb); Adjustment Of Com-Bias (With The Unit Settings Complete); Adjustment Of W/B (With The Unit Settings Complete) - Sharp VL-Z400H-T Service Manual

ADJUSTMENT OF LCD CIRCUIT

When making this adjustment, set the backlight switch to "Normal".
(Wiring board diagram: Main Side A)
1. Setting data
Address 027 08D
Data 94 50

2. Adjustment of DAC full scale (Main PWB)

Measurement point TL6807(G_OUT)
Mode VCR AV input
Adjusting method 1) Set the data values at addresses 41E/086/41C and 410 to FF/80/77 and 00, respectively.
2) Set the data values at addresses 096/411 and 0A8 to 00/80 and 58, respectively.
3) Connect the digital voltmeter to TL6807 (G_OUT) and measure the DC voltage.
4) Set the data values at addresses 096 and 411 to 80 and 00, respectively.
5) At address 094, adjust the DC voltage to the adjustment rating.
6) Reset the data at addresses 41E/086/096/41C/411/0A8 and 410. (Initial value: 00/C5/28/7F/28/
DA_VG + 0.31V ± 10mV
Adjustment rating
Examples · Replacement of IC705, IC4401

3. Adjustment of COM-Bias (with the unit settings complete)

Measurement point LCD panel display surface
Mode VCR AV input
Adjusting method 1) Apply a 40% white signal to the AV input.
2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface. (Cut off outside light.)
3) Minimize the ripple of the output waveform of the illuminometer.
Adjustment rating Minimum value
Remarks Make adjustment after five minutes or more of aging.
Examples · Replacement of LCD panel

4. Adjustment of W/B (with the unit settings complete)

Measurement point LCD panel display surface
Mode VCR AV input
Adjusting method 1) Apply a 40% white signal to the AV input.
2) Apply a 40% white signal to the standard monitor. Make adjustment so that the image on the LCD
Adjustment rating Standard monitor
Remarks Make adjustment after five minutes or more of aging.
Examples · Replacement of LCD panel · Replacement of IC4401, IC705, IC1800
L1803
TL1812
C1815 R1816
C1813 C1812
L1802
TL1808
TL1809
TL1810
TL6807(G_OUT)
DAC full scale
TL1431
090
30
(The LED shows nothing.)
* The measured voltage is (DA_VG).
52 and 7D)
becomes equivalent to the image on the standard monitor.
R1825
C1808 R1803
R4401
R1824
C1814
R1828
D6800
C1406
R6805 C6804 TL7824
TL1451
R1419
L6800
C1407 R1402
R1422
TL7805
R1414 TL6807
R1406 C1416 R1405 C1418
TL1452 C4421 R6800 TL7804
Q1404
R6808
R1423
R6807
R6839 C6827 R6832
R6837
R6840 R6833
C4418
R4415
C4417
Q1405
C1419
C4424 C220 C219
R1421
R246 C4422
IC4401
C1410 R219
C1408 C1409
TL1450
TL206
TL207 TL205
C1437
TL208 TL210 TL209
R1439
R1440
TL4424 TL212 TL211
R1438
IC1431 R1441
R4495
C4426
TL4425
C4428
L1431
R4494
C1432
TL4400 C4423
R4489
R1431
TL4429 TL4428 TL4426
C4431
C4433
Q4483 R4485
C4409 R4436
C4485
Q4482
C4437 R4437
R4486
R4487 C4436
R4481 R4488 R4408
R1435 R1434 R1433 C1433
The same adjusting procedure and connections as
described for the VCR section are used.
Address VCR ADJ 094(G)
Address VCR ADJ 025
Response time: 0.6 sec
Address VCR ADJ 41F, VCR ADJ 421
33
VL-Z400S-T/H-T
VL-Z500S-S/H-S/E-T/E-S
R6810
TL7802 TL7801
TL4470 TL204
R4407 R4406
TL
R4435