19" LCD Color Monitor COMPAQ W19Q
35
2. Panel Power Circuit
3. Inverter Control Relative Circuit
Check C501 should have response from 0V to 5V
When we switch the power switch from off to on
Measured X301 waveform is normal?
OK
Check Q602, Q603 is broken or CN501 solder abnormal?
Replace Q603, Q602 or re-solder CN501
OK
NG
Replace U401
Replace X301
(14.318MHz)
Replace Panel
NG
NG
OK
NG
Check the Bklt-On relative circuit, R603, Q601
In normal operation, when LED =green,
Base of Q601 should =0 v,
In saving mode, when LED=orange,
Base of Q601 should =5 v,
OK
Replace Power board
& Re-do white balance
Measured the inverter connector
CN601
Pin2 on/off control=5V (on)
Pin4 PWM signal control dim 0V-5V
Replace U401
OK
