LG Flatron W2600H - TROUBLESHOOTING GUIDE; No Power Issues; Troubleshooting Waveforms

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TROUBLESHOOTING GUIDE
Copyright 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. NO POWER
1
2
3
Waveforms
NO POWER
(POWER INDICATOR OFF)
Flash ROM Problem.
NO
NO
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK U901(3.3V),
U902(1.8V) LINE.
YES
CHECK P305
VOLTAGE
PIN9~ PIN12 (5V)?
IS IC302 PIN2(3.3V),
IC303 PIN2(1.8V)?
4
NO
CHECK CRYSTAL(X200)
YES
CHECK X200
Frequency
NO
CHECK IC202
Do ISP. Then
Recover?
YES
YES
1
P305 #9~12
2
IC302 #2
3
IC303 #2
4
X200