Vg Center Adjustment (Pd-137 Board); V-Com Adjustment (Pd-137 Board) - Sony Cyber-shot DSC-P1 Service Manual

7. VG Center Adjustment (PD-137 Board)

Set the center of VG signal for driving the LCD to the specified
value.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01 01
2 5 F1 02
3 D D6
4 D D6
Processing after Completing Adjustments:
Order Page Address Data
1 5 F1 00
2 0 01 00
PLAY
Arbitrary
Pin 9 of CN881 (VG)
Digital voltmeter
D
D6
A = 7.00 ± 0.05 V (TYPE ST)
A = 6.00 ± 0.05 V (TYPE SA)
Procedure
Change the data and set the
DC voltage (A) to the specified
value.
Press PAUSE button.
Procedure

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
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note: Perform "Bright Adjustment" and "Contrast Adjusstment"
before this adjustment.
Adjusting method:
Order Page Address Data
1 0 01
2 5 F1
3 2 10
4 D D8
5 D D8
6 D D8
7
8
9
10
11 D D8
Note: Refer to table 5-2-2. "Hexadecimal-decimal conversion
table"
Processing after Completing Adjustments:
Order Page Address Data
1 5 F1
2 2 10
3 0 01
A
5-31
PLAY
Arbitrary
Check on LCD screen
D
D8
The brightness difference
between the section-A and
section-B is minimum
Procedure
01
02
02
Change the data so that
brightness of the section A
and section B is equal.
TYPE SA:
Press PAUSE button, and
proceed to "Processing after
Completing Adjustments".
TYPE ST:
Proceed to step 6 to 11.
Read the data and this data is
named Dref
Conver Dref to decimal
notation, and obtain Dref'
(Note)
Calculate D ' using
D8
following equations
(decimal calculation)
D ' = Dref' – 9
D8
Conver D ' to a hexadecimal
D8
number, and obtain D
(Note)
D Press PAUSE button.
D8
Procedure
00
00
00
B A
A
B
B A
B
Fig. 5-1-26
D8