V-Com Adjustment (Pd-131 Board); White Balance Adjustment (Pd-131 Board) - Sony CCD-TR618 Service Manual

Ver 1.1 2001. 04

6. V-COM Adjustment (PD-131 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 VTR stop
Signal No signal
Measurement Point Check on LCD display
Measuring Instrument
Adjustment Page 7
Adjustment Address E7
Specified Value The brightness difference between the
section A and section B is minimum.
Note: This adjustment should be carried out upon completion of the
following adjustments.
RGB AMP Adjustment
Contrast Adjustment
COM AMP Adjustment
Adjusting method:
Order Page Address Data
1 0 01 01
2 7 E7
3 7 E7
4 7 E7
5 0 01 00
B
A
B
A
Fig. 5-1-26.
Procedure
Set the data.
Change the data so that the
brightness of the section A and
that of the section B is equal.
Subtract 8 from the data.
Press PAUSE button.
Set the data.
A
B
A
B

7. White Balance Adjustment (PD-131 board)

Correct the white balance.
If deviated, the reproduction of the LCD screen may degenerate.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: Check the white balance only when replacing the following parts.
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC5501
Adjusting method:
Order Page Address Data
1 0 01
2 7 EB
3 7 EC
4 7 EB
5 7 EB
6 7 EB
7 7 EC
8 7 EC
9 7 EC
10 0 01
5-33
VTR stop
No signal
Check on LCD screen
7
EB, EC
The LCD screen should not be colored.
Procedure
01 Set the data.
60 Set the data, and press PAUSE
button.
65 Set the data, and press PAUSE
button.
Check that the LCD screen is
not colored. If not colored,
proceed to step 10.
Change the data so that the LCD
screen is not colored.
Press PAUSE button.
Change the data so that the LCD
screen is not colored.
Press PAUSE button.
If the LCD screen is colored,
repeat steps 5 to 9.
00 Set the data.