LG Flatron L1552S

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TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK U803 PIN3(1.8V)
CHECK U201
NO
NO
NO
CHECK ADAPTER LED
IS IT GREEN?
CHECK 3.3 LINE
(OPEN CHECK)
CHECK 3.3V LINE
NO
CHECK X-TAL
YES
YES
YES
YES
CHECK ADAPTER
OUTPUT VOLTAGE(12V)?
CHECK
U801 PIN1 VOLTAGE
(3.3V) ?
IS U201
PIN90 (3.3V)
VOLTAGE ?
CHECK U201 PIN 96
PULSE
1
NO PROBLEM
1
Waveforms
U201-#96