Lcd System Adjustment; Lcd Initial Data Input - Sony GV-A500 Service Manual

3-7.

LCD SYSTEM ADJUSTMENT

Note 1 : The back light (fluorescent tube) is driven by a high
voltage AC power supply. Therefore, do not touch the
back light holder to avoid electrical shock.
Note 2 : When replacing the LCD unit, be careful to prevent
damages caused by static electricity.
Note 3 : Set the brightness to the center using the LCD BRIGHT
button.
[Adjusting connector]
Most of the measuring points for adjusting the LCD display are
concentrated in the following connector.
CN802 of the VC-197 board. Connect the measuring instruments
via the multi CPC jig (J-6082-311-A).
The following table shows the Pin No. and signal name of the
connector.
Pin No. Signal Name
1 VR
3 VB
5 GND
7 HDB
9 FRP
[Power Supply Voltage]
Adjust the power supply voltage so that the battery terminal voltage
becomes 7.2 ± 0.1 Vdc .
[Video input signal for adjustment]
If stated as "10-step stair-step" in the signal column, input the 10-
step stair-step signal in the video input terminal as the video input
signal for the adjusting. Check that the input signal level is 1.00
Vp-p before adjusting.
Approx.
0.714V
Approx.
0.286V
Horizontal sync
Fig. 5-3-27.
Pin No. Signal Name
2 VG
4 V-COM
6 SYNC
8 SAT
100IRE
1.00V

1. LCD Initial Data Input

Mode
Signal
Adjustment Page
Adjustment Address
Adjusting method:
1) Set page: 0, address: 01, data: 01.
2) Select page: D, and input the data in the following table.
Note : To write in the non-volatile memory (EEPROM), press
the PAUSE button of the adjusting remote commander
each time to set the data.
3) Set page: 0, address: 01, data: 00.
NTSC
Address
4"
LCD
3C 08
3D 07
3E 03
3F 05
52 88
53 79
54 72
55 76
56 68
57 97
58 85
59 97
5A 7D
5B 7E
5C 69
5D 88
5E 00
5F 69
60 00
61 00
62 A1
( ): NTSC model only (GV-A500)
5-39
VTR stop
Arbitrary
D
3C to 3F, 52 to 62
Data
PAL
Remark
4"
LCD
08
08
03 Fixed value
05 Fixed value
86
66
60
79
73
9A
56
9A
7C Fixed value
7D Fixed value
60 Fixed value
86
60 (Fixed value)
60 Fixed value
B0 Fixed value
67 Fixed value
A1 Fixed value