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LC-45GD5U
TROUBLE SHOOTING TABLE
s TEMP . AD on page 1 of process adjustment mode set to 255?
s the harness connected correctly between the inverter GND
PWB and LCD control PWB?
s the input voltage at pin (62) of C2004 (microprocessor) 5V?
The thermistor on the inverter GND PWB is faulty.
Does the inverter oscillation circuit in the power supply unit
operate normally?
Has the fuse (F705) in the power supply unit burnt out?
s pulse power supplied to the booster circuit on the inverter
PWB?
Check the booster circuit on the inverter PWB. Are circuits on the
inverter GND PWB and LCD control PWB normal?
Check the fluorescent lamps, connectors and peripheral circuits.
s the gradation pattern displayed properly when setting
Adjustment process menu -> PATTERN1 -> PATTERN3 to "1"?
( s it whitish or dark?)
Disconnect the FPC from SC4651 and SC4652. (To protect the
panel against damage)
Check of voltage supplied to the panel
2pin:
VH0
3pin:
VH31
4pin:
VH63
5pin:
VH95
6pin:
VH127
7pin:
VH159
8pin:
VH191
9pin:
VH247
10pin: VH255
11pin: VLS
30pin: VSH
64pin: VL0
63pin: VL31
62pin: VL63
61pin: VL95
60pin: VL127
59pin: VL159
58pin: VL191
57pin: VL247
56pin: VL255
76pin: VGH
Square wave (32V-15V)
78pin: VGL
oise is caused to the moving picture with the QS drive on.
YES
YES
YES
The backlight does not go on.
YES
NO
YES
YES
The whole screen is whitish (LCD power supply).
NO
YES
7.47V
9.48V
9.74V
10.11V
10.47V
10.93V
11.41V
12.30V
14.2V
15V
3.3V
7.42V
5.32V
4.93V
4.53V
4.06V
3.55V
3.06V
0.99V
0.28V
-7V
(Continued)
NO
Check C4901 and its peripheral circuits.
NO
Connect the harness correctly or replace it.
NO
Pin (62) of C2004 (microprocessor) is faulty.
NO
Check the inverter oscillation circuit.
YES
Check the circuit behind the burnt fuse.
NO
Check the connector (PG) connecting the power supply PWB and
inverter PWB.
NO
Check each PWB circuit or harness.
YES
Check the video signal circuit.
56
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