Sony Cyber-shot DSC-P1, Service Manual

Page: 88 / 105

5-31
7. VG Center Adjustment (PD-137 Board)
Set the center of VG signal for driving the LCD to the specified
value.
Mode PLAY
Signal Arbitrary
Measurement Point Pin 9 of CN881 (VG)
Measuring Instrument Digital voltmeter
Adjustment Page D
Adjustment Address D6
Specified Value A = 7.00 ± 0.05 V (TYPE ST)
A = 6.00 ± 0.05 V (TYPE SA)
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 5 F1 02
Change the data and set the
3 D D6 DC voltage (A) to the specified
value.
4 D D6 Press PAUSE button.
Processing after Completing Adjustments:
Order Page Address Data Procedure
1 5 F1 00
2 0 01 00
8. V-COM Adjustment (PD-137 Board)
Set the DC bias of the common electrode drive signal of LCD to
the specified value.
If deviated, the LCD display will be move, producing flicker and
conspicuous vertical lines.
Mode PLAY
Signal Arbitrary
Measurement Point Check on LCD screen
Measuring Instrument
Adjustment Page D
Adjustment Address D8
Specified Value The brightness difference
between the section-A and
section-B is minimum
Note: Perform “Bright Adjustment” and “Contrast Adjusstment”
before this adjustment.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 5 F1 02
3 2 10 02
Change the data so that
4 D D8 brightness of the section A
and section B is equal.
TYPE SA:
Press PAUSE button, and
5 D D8
proceed to “Processing after
Completing Adjustments”.
TYPE ST:
Proceed to step 6 to 11.
6 D D8
Read the data and this data is
named Dref
Conver Dref to decimal
7 notation, and obtain Dref’
(Note)
Calculate D
D8
’ using
8 following equations
(decimal calculation)
9 D
D8
’ = Dref’ – 9
Conver D
D8
’ to a hexadecimal
10 number, and obtain D
D8
(Note)
11 D D8 D
D8
Press PAUSE button.
Note: Refer to table 5-2-2. “Hexadecimal-decimal conversion
table”
Processing after Completing Adjustments:
Order Page Address Data Procedure
1 5 F1 00
2 2 10 00
3 0 01 00
Fig. 5-1-26
A
A
A
A
B
B
B
B