Bright Adjustment (Sy-68 Board) - Sony DSC-S75 Service Manual

5. Bright Adjustment (SY-68 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 01
2 4 10 01
3 4 F1 03
4 D D0
5 D D0
6 D D0
7
8
9
10 D CE D
CE
11 D DE D
DE
Note: Refer to table 5-2-2. "Hexadecimal-decimal conversion
table".
Processing after Completing Adjustment:
Order Page Address Data
1 4 F1 00
2 4 10 00
3 0 01 00
PLAY
Arbitrary
Pin 9 of CN401 (VG)
External trigger: Pin 8 of CN401
(PANEL_COM)
Oscilloscope
D
D0
A = 1.32 ± 0.05 Vp-p
Procedure
Change the data and set the
voltage (A) to the specified value.
Press PAUSE button.
Read the data and this data is
named Dref.
Convert Dref to decimal
notation, and obtain Dref'.
(Note)
Calculate D ' and D ' using
CE DE
following equations.
(decimal calculation)
D ' = Dref' – 11
CE
D ' = Dref' + 24
DE
Convert D ' and D ' to
CE DE
hexadecimal numbers, and
obtain D and D . (Note)
CE DE
Press PAUSE button.
Press PAUSE button.
Procedure
GAMMA1 limiter level
A
Pedestal
A: Between the pedestal and GAMMA1
limiter level
5-32
2H
Fig. 5-1-21