Troubleshooting Guide - LG Flatron L1552S Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK ADAPTER
OUTPUT VOLTAGE(12V)?
U801 PIN1 VOLTAGE
CHECK U803 PIN3(1.8V)
PIN90 (3.3V)
VOLTAGE ?
CHECK U201 PIN 96
1
CHECK U201
Waveforms
1
U201-#96

TROUBLESHOOTING GUIDE

1. NO POWER
YES
CHECK
(3.3V) ?
YES
IS U201
YES
PULSE
YES
NO
NO
NO
NO
- 13 -
CHECK ADAPTER LED
IS IT GREEN?
CHECK 3.3 LINE
(OPEN CHECK)
NO PROBLEM
CHECK 3.3V LINE
CHECK X-TAL