Troubleshooting Guide - LG Flatron L226WTQ Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK J905 VOLTAGE
1
PIN5, PIN6 (5V)?
2
IS U901 PIN2(3.3V)
U902 PIN2(1.8V)
1 3
CHECK X501 PIN127
1 4
CHECK U501
Waveforms
1
J905-#5,6

TROUBLESHOOTING GUIDE

1. NO POWER
YES
YES
PULSE
YES
2
U901-#2
NO
NO
NO
3
U902-#2
- 15 -
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK U901(3.3V)
U902(1.8V) LINE
CHECK CRYSTAL(X501)
4
U501-#127