Troubleshooting Guide - LG Flatron W2284F Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK P403 VOLTAGE
1
PIN1, PIN2 (12V)?
2
IS IC503 PIN5(5V)
IC501 PIN3(3.3V)
1 3
IC502 PIN2(1.8V)
1 4
CHECK IC200 PIN127
PULSE
CHECK IC200
Waveforms
P403-#1,2
1
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Only for training and service purposes

TROUBLESHOOTING GUIDE

1. NO POWER
YES
YES
YES
IC501-#2
2
NO
NO
NO
IC502-#2
3
- 15 -
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK IC503(5V)
IC501(3.3V)
IC502(1.8V)LINE
CHECK CRYSTAL(X200)
IC200-#127
4
LGE Internal Use Only