Lcd V-Com Adjustment (Pd-204 Board); Lcd White Balance Adjustment (Pd-204 Board) - Sony CCD-TRV128 Service Manual

CCD-TRV128/TRV228/TRV228E/TRV328/TRV428/TRV428E

2. LCD V-COM Adjustment (PD-204 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 "LCD Level Adjustment" before this adjustment.
Note 2: Check that the data of page: 0, address: 10 is "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 52
3 C 52
4 C 52
5 0 01
VTR stop (PLAY/EDIT mode)
No signal
Check on LCD screen
C
52
The brightness difference between
the section-A and section-B is
minimum
Procedure
01
Change the data so that
brightness of the section A
and section B is equal.
Subtract 8 from the data.
Press PAUSE button.
00
B A
A
B
B A
A B
Fig. 6-1-13

3. LCD White Balance Adjustment (PD-204 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: Check that the data of page: 0, address: 10 is "00".
Note 2: Check the white balance only when replacing the fol-
lowing parts. If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC6001
Adjusting method:
Order Page Address Data
1 0 01
2 C 56
3 C 57
4
56
5 C
57
6 0 01
Note 3: To write in the non-volatile memory (EEPROM), press
the PAUSE button each time to set the data.
6-24
VTR stop (PLAY/EDIT mode)
No signal
Check on LCD screen
C
56, 57
LCD screen must not be colored
Procedure
01
87 Press PAUSE button.
68 Press PAUSE button.
Check that the LCD screen is
not colored. If not colored,
proceed to step 6.
Change the data so that the
LCD screen is not colored.
(Note 3)
00