Contrast Adjustment (Pk-062 Board); V-Com Level Adjustment (Pk-062 Board) - Sony DSC-P31M Service Manual

DSC-P31/P31M

5. Contrast Adjustment (PK-062 Board)

Set the level of the VIDEO signal for driving the LCD to the speci-
fied value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 A 02
3 4 F1
4 A 8A
5 A 8A
Note: Adjust it between data 00 and 7F.
Processing after Completing Adjustments:
Order Page Address Data
1 A 02
2 4 F1
3 0 01
10 steps peak
A
Pedestal
A: Between the pedestal and 10 steps peak
PLAY
Arbitrary
Pin 9 of CN903 (VG)
External trigger: Pin 8 of CN903
(PANEL COM)
Oscilloscope
A
8A
A = 2.65 ± 0.05 Vp-p
Procedure
01
03 Press PAUSE button.
03
Change the data and set the
voltage (A) to the specified
value. (Note)
Press PAUSE button.
Procedure
00 Press PAUSE button.
00
00
2H
Fig. 5-1-19

6. V-COM Level Adjustment (PK-062 Board)

Set the common electrode drive signal level of LCD to the speci-
fied value.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 A 02
3 4 F1
4 A 87
5 A 87
Processing after Completing Adjustment:
Order Page Address Data
1 A 02
2 4 F1
3 0 01
5-36
PLAY
Arbitrary
Pin 8 of CN903
(PANEL_COM)
Oscilloscope
A
87
A = 5.42 ± 0.05 Vp-p
Procedure
01
03 Press PAUSE button.
03
Change the data and set the PSIG
signal level (A) to the specified
value.
Press PAUSE button.
Procedure
00 Press PAUSE button.
00
00
2H
Fig. 5-1-20
A