Contrast Adjustment (Pd-155 Board); V-Com Level Adjustment (Pd-155 Board) - Sony Cyber-shot DSC-F707 Service Manual

DSC-F707

5. Contrast Adjustment (PD-155 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 D 1E
3 4 F1
4 D EA
5 D EA
Processing after Completing Adjustments:
Order Page Address Data
1 D 1E
2 4 F1
3 0 01
A
Pedestal
A: Between the pedestal and 10 steps peak
PLAY
Arbitrary
Pin 9 of CN305 on FR-181
board (PANEL_VG)
External trigger: Pin 8 of
CN305 on FR-181 board
(PANEL_COM)
Oscilloscope
D
EA
A = 2.65 ± 0.07 Vp-p
Procedure
01
10 Press PAUSE button.
03
Change the data and set the
voltage (A) to the specified
value.
Press PAUSE button.
Procedure
01 Press PAUSE button.
00
00
10 steps peak
2H
Fig. 5-1-23

6. V-COM Level Adjustment (PD-155 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 D 1E
3 4 F1
4 D E7
5 D E7
Processing after Completing Adjustments:
Order Page Address Data
1 D 1E
2 4 F1
3 0 01
5-34
PLAY
Arbitrary
Pin 8 of CN305 on FR-181
board (PANEL_COM)
Oscilloscope
D
E7
A = 5.42 ± 0.05 Vp-p
Procedure
01
10 Press PAUSE button.
03
Change the data and set the
voltage (A) to the specified
value.
Press PAUSE button.
Procedure
01 Press PAUSE button.
00
00
2H
Fig. 5-1-24
A