Sharp VL-PD1U - LCD Circuit Adjustments

VL-PDl U
4. AGC adiustment
1 Test point 1 TL1402
Mode
Procedure
100% white signal (half colour bar)
EE mode
1) Call the adjustment mode (V-ADJ).
2) Set the address to “24” and call the data.
Examples
3) Vary the data with the FF and REW keys to set the signal appearing at TL1402 to 1 .OVp-p rt 0.05.
l During E2PROM replacement. l During IC4401 replacement. l During ICI401 replacement.
l During circuit board (Main or Sub) replacement.
l Durino circuit boards (Main and Sub) replacement.
.
5. Frame lack adjustment
Procedure
2) Set the address to “21” and call the data.
3) Vary the data with the FF and REW keys to set the “80”.
Examples l During E2PROM replacement.
ADJUSTING THE LCD CIRCUIT
* To make this adjustment, set the backlight switch to the “NORMAL” position.
(Wiring board diagram: Main Side B)
TL800(HSY)
VCO free-run
I \
TL803( B OUT)
DAC full-scale
/
TL806(BL_GND)
Operation of lamp system
safety defection circuit
TL808(BL_PWR)
‘Operation of lamp system
safety defection circuit
TL807(BL_PWR)
-Operation of lamp system
safety defection circuit
- TL801 (R OUT)
DAC full-scale
+ TL802(G OUT)
DAC full-scale
VCO free-run
\ TL804(C OUT)
DAC full-scale
1040