LG Flatron L1900J - TROUBLESHOOTING GUIDE; 1. NO POWER

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TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
NO
CHECK ADAPTER, AND
FIND OUT A SHORT POINT
AS OPENING
EACH POWER LINE
NO PROBLEM
1
Waveforms
IC101-#127
CHECK KEY CONTROL
CONNECTOR ROUTINE
CHECK IC201
NO
NO
CHECK 3.3V LINE
(OPEN CHECK)
CHECK 3.3V LINE
NO
CHECK X-TAL
YES
CHECK P303
VOLTAGE
PIN1 (12V)?
CHECK
IC102 PIN 8
VOLTAGE(3.3V) ?
IS IC101
PIN8 (3.3V)
VOLTAGE ?
CHECK IC101 PIN 127
PULSE
1
YES
YES
YES