HP W19 Service Manual page 33

19" LCD Color Monitor
2. Panel Power Circuit
Check C509 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?
OK
Replace Panel
3. Inverter Control Relative Circuit
Measured the inverter connector
CN602
Pin1 on/off control=5V (on)
Pin2 PWM signal control dim 0V-5V
Replace Power board
& Re-do white balance
4. U4-Data Output
Measured X401 waveform is
normal?
Check TSU56AK (U401)
Signal output (PIN102-103, 106-113,118-125,128,1)
Is the waveform ok?
Check HS/VS input signal are normal?
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NG
Replace Q204, Q203 or re-solder CN503
OK
OK
NG
OK
Replace U401
NG
Measured X601 waveform is normal?
OK
Replace U601
Check the Bklt-On relative circuit, R201, Q201,
In normal operation, when LED =green,
NG
Base of Q201 should =0 v,
In saving mode, when LED=orange,
Base of Q201 should =5 v,
Replace U201
NG
Replace X401(14.318MHz)
OK
Check relative circuit to panel
NG
Check relative component
33
HP W19
NG
Replace X601
(24MHz)
OK