AOC 712SI, Service Manual, Page: 37 / 58

17" LCD Color Monitor AOC 712Si
37
OSD is normal when on signal, no picture when connect signal (black screen)
Miss color
Check pin70
、
pin74 H/V
sync signal is OK
Check VGA 、
HS
、
VS
NG
Change signal
connector
NG
Change U2
OK
Check U5 、 D15 、 D16 、
C55
、
C56
OK
Change defective component
NG
Check the missing color,
the input
Check signal
connector if OK
NG
Check signal
source
NG
OK
Check U2 pin77 pin82
pin84,
OK
Change signal
connector connecter
check U2
OK
NG
R fail G fail B fail
Check D14
、
R69 、 C52
Check D10
、
R66 and C51
Check D6
、
R61 and
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