Com Bias - Sharp LC-26GA5H Service Manual

7. LCD panel adjustment
Common bias adjustment
Adjustment item Adjustment conditions

COM BIAS

Visual check
8. Video signal adjustment procedure
(1) Signal check
Signal generator level adjustment check (Adjustment to the specified level)
» Composite signal
» 15K component signal
» 33K component signal
(2) Entering the adjustment process mode
Enter the adjustment process mode according to the steps described in section 3.
(3) PAL signal adjustment (Tuner)
Adjustment item
1 Adjustment
2 Auto adjustment Page 3/14
performance
1. Enter the adjustment process mode.
2. Using the Cursor UP/DOWN keys on the remote controller, move to the
"COMBIAS" item. Using the Cursor RIGHT/LEFT keys, select the
setting.
3. Vary the setting with the Cursor UP/DOWN keys, and the test pattern
appears. Adjust the setting so that the flickering near the center of the
screen should be minimized.
4. Finally press the "OK" key on the remote controller to quit this item.
* Adjustment process mode menu is listed in section 5.
:
: Y level
PB, PR level :
: Y level
PB, PR level :
Adjustment conditions
Feed the Full-field color bar signal (75% color saturation) to INPUT 1
(SIGNAL)
∫ input.
Composite Full-field
Feed the RF signal (by use of E-12ch) to TUNER.
Colour bar signal
∫
RF signal (E-12ch)
(TERMINAL)
∫
INPUT1 video input
terminal
∫
Tuner RF terminal
Bring the cursor on [ËPAL ALL ADJ] and press [ENTER].
[ËPAL ALL ADJ FINISH] appears when finished.
Adjustment procedure
0.714Vp-p ± 0.02Vp-p (Pedestal to white level)
: 0.714Vp-p ± 0.02Vp-p (Pedestal to white level)
0.7Vp-p ± 0.02Vp-p
: 0.7Vp-p ± 0.02Vp-p (Pedestal to white level)
0.7Vp-p ± 0.02Vp-p
Adjustment procedure
[Video input signal]
↑100% white
23
LC-26GA5H/M/X
[E-12CH]
↑100% white