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TY-LCD20W, L202WA-BJB (CHASSIS:LM62C) - LG TV Service Manual (repair manual). Page 17

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- 17 -
ⓒ
2008 LG Electronics. Inc. All right reserved.
2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS
CHECK IC502 INVERTER
ON/OFF PORT
P605 PIN9 3.3V?
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK POWER BOARD
(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
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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