V-Com Adjustment (Pk-52 Board); White Balance Adjustment (Pk-52 Board) - Sony MVC-FD85 Service Manual

8. V-COM Adjustment (PK-52 board)

Set the DC bias of the common electrode drive signal of LCD to the
specified value.
If deviated, the LCD display will move, producing flicker and
conspicuous vertical lines.
Mode PLAY
Signal Arbitrary
Measurement Point
Check on LCD display
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 Adjustment" before this
adjustment.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 5, address: F1, set data: 02.
3) Select page: 2, address: 10, set data: 02.
4) Select page: D, address: D8, change the data so that the
brightness of the section A and that of the section B is equal.
5) Press the PAUSE button of the adjustment remote commander.
6) Select page: 5, address: F1, set data: 00.
7) Select page: 2, address: 10, set data: 00.
8) Select page: 0, address: 01, and set data: 00.
B
A
B
A
Fig. 5-1-27.
A
B
A
B

9. White Balance Adjustment (PK-52 board)

Correct the white balance.
If deviated, the LCD screen color cannot be reproduced.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note 1: Use the AC power adaptor during this adjustment.
Note 2: Check the white balance only when replacing the following parts.
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC901
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 5, address: F1, set data: 02.
3) Select page: D, address: D2 and D3, set the data to the initial
value.
Note: Press the PAUSE button of the adjustment remote commander
each time to set the data.
Address
D2
A0
Data
80
4) Check that the LCD screen is not colored. If colored, change
the data of page: D, address: D2 and D3 so that the LCD screen
is not colored.
Note: To write in the non-volatile memory (EEPROM), press the
PAUSE button of the adjustment remote commander each time
to set the data.
5) Select page: 5, address: F1, set data: 00.
6) Select page: 0, address: 01, and set data: 00.
5-36
PLAY
Arbitrary
Check on LCD display
D
D2, D3
The LCD screen should not be
colored.
Remark
D3
90 LCD TYPE SA
80 LCD TYPE ST