AOC LM-522 - Page 28

LM-522 Service Manual
28
2. PANEL POWER CIRCUIT
NG
3. INVERTER CONTROL RELATIVE CIRCUIT
Check R162 should have response from 0V to 5V
When we switch the power switch from off to on
Measured X101 waveform is normal?
OK
Check Q102, Q101 is broken or CN109 solder abnormal?
Replace Q102, Q101 or re-solder CN109
OK
NG
Check the Bklt-On relative circuit, R201, Q201,
In normal operation, when LED =green,
Base of Q201 should =0 V,
In saving mode, when LED=orange,
Base of Q201 should =5V,
OK
Replace Power board
& Re-do white balance
Measured the inverter connector
CN102
Pin1 on/off control=5V (on)
Pin2 PWM signal control dim 0V-5V
NG
Replace U101
Replace X101
Replace Panel
NG
Replace U101
NG
OK
OK