V-Com Adjustment (Pk-61 Board) - Sony MVC-FD100 Service Manual

MVC-FD100/FD100H/FD200/FD200H

8. V-COM Adjustment (PK-61 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 1: Perform "Bright Adjustment" and "Contrast Adjustment"
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
7
8
9
10 D D8
Note 2: 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
PLAY
Arbitrary
Check on the 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.
Read the data and this data is
named Dref
Convert Dref to decimal
notation, and obtain Dref'
(Note 2)
Calculate D ' using
D8
following equations
(decimal calculation)
D ' = Dref' – 9
D8
Convert D ' to a hexadeci-
D8
mal number, and obtain D
(Note 2)
D Press PAUSE button.
D8
Procedure
00
00
00
D8
5-40
A
B
A
B
B A
A
B
Fig. 5-1-27