Diamond View DV154, Service Manual

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DV154/154B LCD Monitor Service Guide
Trouble Shooting
4
4. Power Board
Backlight didn't shine
LED shined?
3.3V existed?
PF751 broke? Replace new fuse
PWM existed?
(BLT_ADJ)
Plug CN701 again
or checking I/F BD
Turn on level existed?
(BLT_ON)
Insert them again
Check CN752, CN753
was pluged properly?
Plug CN701 again or
checking I/F BD
Replace IC751
3.3V_MCU existed?
Checking F601
Broke?
Check IC601 Vcc
existed?
Replace
IC601,IC602,
IC702,D701
Replace Q701 Q702
or check
PW_DOWN signal
Replace new fuse
Replace
IC601,Q602,Q603
R602
Y
N
N
N
N
Y
Y
Y
Y
N
Y
N
Y
Y
Y
N
N
N
Check BLT_ADJ
signal existed
Plug CN701 again
or checking I/F BD
Y
N
Replace IC751,Q751