Lcd System Adjustment - Sony DCM-M1 Service Manual

1-3.

LCD System Adjustment

Note 1: The backlight (fluorescent tube) is driven with high volt-
age AC power. Accordingly, do not touch the backlight
holder; otherwise you could receive an electric shock.
Note 2: Take extreme care not to destroy the LCD unit by static
electricity, when replacing it.
Note 3: On the Menu screen, set the "Panel Brightness" and
"Panel Color Density" to the center.
Note 4: Once the 10-step gradation pattern (white/black) has been
set, it is held until the power is turned off. Therefore, it
is not necessarily set every time in successive adjust-
ment.
[Adjustment steps]
The LCD adjustment, as a rule, should be performed following
the steps given below.
Only for the "Backlight Consumed Current Adjustment", the or-
der may be changed.
1. LCD Adjustment Data Initializing
2. VCO Adjustment
3. Horizontal Position Adjustment
4. RGB D Range Adjustment
5. Brightness Adjustment
6. Contrast Adjustment
7. V-COM Level Adjustment
8. Color Adjustment
9. V-COM Adjustment
10. Backlight Consumed Current Adjustment
11. White Balance Adjustment
[Connector for adjustment]
The measurement points for LCD adjustment are concentrated on
the CN4305 on the LCD board.
Connect a measuring instrument to it via adjusting monitor jig
(J-2503-017-A).
The following table lists the pin No. and signal name of CN4305.
Use the connector with LCD labeling.
Pin No.
LCD board Adjustment
CN4305 monitor jig
9
8
7
6
5
4
3
2
1
–
LCD board CN4305
9
1
Use the connector
with LCD labeling.
– 8 –
Signal name
A XTST
B SYF
C HSY
D PANEL_XHD
E GND
F PANEL_COM
G VG
H BL (+)
I BL (–)
J NC
Table.7-1-3
A
B
C
D
E
F
G
H
I
J
Adjusting monitor jig
(J-2503-017-A)
Fig.7-1-10