LG TY-LCD20W / L202WA-BJB (CHASSIS:LM62C) Service Manual ▷ View online
- 17 -
ⓒ
2008 LG Electronics. Inc. All right reserved.
2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS
CHECK IC502 INVERTER
ON/OFF PORT
ON/OFF PORT
P605 PIN9 3.3V?
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK POWER BOARD
(LIPS)
(LIPS)
CHECK P605
VOLTAGE PIN5,6
(5V)?
NO
NO
NO
NO
1. CONFIRM BRIGHTNESS
OSD CONTRL STATUS
2. CHECK SCALER DIM ADJ
PORT
3. CHECK SCALER LAMP
ADJ PORT
CHECK P605
PIN11
POWER BOARD (LIPS)
CHECK
PULSE AS
CONTACTING PROBE
TO THE LAMP
WIRE OF THE
LCD MODULE
LCD MODULE
REPLACE LCD MODULE
YES
1
3
2
4
YES
YES
YES
Waveforms
1
P605-#5,6
2
P605-#9
4
LAMP CURRENT
3
3
P605-#11 (Brightness 100)
J905-#10 (Brightness 0)
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ⓒ
2008 LG Electronics. Inc. All right reserved.
3. NO RASTER (OSD IS NOT DISPLAYED) - MAIN
1. CHECK PIN 201,202
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN IC502
3. TROUBLE IN IC502
CHECK IC502
PIN7(3.3V)
PIN131(1.8V)
NO
NO
NO
CHECK IC702(1.8V),
IC703(3.3V)
IC703(3.3V)
IC501
PIN 201,202
14.3MHZ?
CHECK CONNECTION LINE
FROM D-SUB TO IC502
FROM D-SUB TO IC502
TROUBLE IN CABLE
OR LCD MODULE
YES
YES
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK IC502
PIN168(H-SYNC) AND
PIN169(V-SYNC).
IS PULSE APPEARED AT
SIGNAL PINS?
YES
1
Waveforms
1
U502-#201
- 19 -
ⓒ
2008 LG Electronics. Inc. All right reserved.
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN IC502
CHECK PC
PC IS GOING
INTO DPM MODE
PC IS GOING
INTO DPM MODE
NO
CHECK H/V SYNC LINE
NO
YES
CHECK R606 AND
R608, SYNC
APPEARED?
CHECK
IC502 PIN 168,169
SYNC PULSE
YES
1
H-SYNC
2
V-SYNC
Waveforms
1
2
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EXPLODED VIEW
ⓒ
2008 LG Electronics. Inc. All right reserved.
010
070
040
060
050
020
LV
1
090
100
11
0
030
120
080
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