Troubleshooting Guide - LG Flatron L245WP Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK J104
1 VOLTAGE
PIN12,13,14 (5V)?
IS U401 PIN2(2.5V)
2
IS U412 PIN2(2.5V)
3
U403,U404 PIN2(3.3V)
U406 PIN2(1.8V)
CHECK IC501 PIN G4,G3
1 4
CHECK IC501
Waveforms
1
J104-#2,13,14

TROUBLESHOOTING GUIDE

1. NO POWER
YES
YES
PULSE
YES
2
U406-#2
NO
NO
NO
3
U403,U404-#2
- 15 -
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK
U401(2.5V),U412(2.5)
U406(1.8V) LINE
CHECK CRYSTAL(U204)
4
U204-#G3,G4