Read Sony GV-D200 Service Manual online
5-37
6. COM AMP Adjustment (PD-130 board)
Set the common electrode drive signal level of LCD to the specified
value.
value.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 4 of CN5502 (PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
A7
Specified Value
A = 6.33 ± 0.05Vdc
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
A7
Change the data and set the
PANEL COM signal level (A) to
the specified value.
PANEL COM signal level (A) to
the specified value.
3
D
A7
Press PAUSE button.
4
0
01
00
Set the data.
7. V-COM Adjustment (PD-130 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.
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
D
Adjustment Address
A4
Specified Value
The brightness difference between the
section A and section B is minimum.
section A and section B is minimum.
Note:
Perform “RGB AMP Adjustment”, “Contrast Adjustment” and
“COM AMP Adjustment” before this adjustment.
“COM AMP Adjustment” before this adjustment.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
A4
Change the data so that the
brightness of the section A and
that of the section B is equal.
brightness of the section A and
that of the section B is equal.
3
D
A4
Subtract 8 from the data.
4
D
A4
Press PAUSE button.
5
0
01
00
Set the data.
A
2H
A
A
A
A
B
B
B
B
Fig. 5-3-23.
Fig. 5-3-22.
