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2. PANEL POWER CIRCUIT
NG
Check R207 should have response from 0V to 5V
When we switch the power switch from off to on
OK
Check Q204, Q203 is broken or CN503 solder abnormal?
NG
OK
Replace Panel
3. INVERTER CONTROL RELATIVE CIRCUIT
Measured the inverter connector
CN102
Pin1 on/off control=5V (on)
Pin2 PWM signal control dim 0V-5V
OK
Replace Power board
& Re-do white balance
NG
Measured X601 waveform is normal?
Replace Q204, Q203 or re-solder CN503
Check the Bklt-On relative circuit, R201, Q201,
NG
In normal operation, when LED =green,
Base of Q201 should =0 v,
In saving mode, when LED=orange,
Base of Q201 should =5 v,
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AOC 176V
NG
Replace X601
(20MHz)
OK
Replace U601
OK
Replace U201
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