LG Flatron W2442PA - TROUBLESHOOTING GUIDE; No Power Troubleshooting

TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK IC101
NO
NO
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK IC402(3.3V)
IC401(1.8V) LINE
NO
CHECK CRYSTAL(X101)
YES
YES
YES
CHECK P402 VOLTAGE
PIN5, PIN6 (5V)?
IS IC402 PIN3
IC401 PIN3
CHECK IC101 PIN25
PULSE
1
2
13
14
Waveforms
1
P402-#5,6
2 IC4
02-#2
3
IC401
4
IC101
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Only for training and service purposes
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