Operating instructions

42″&47″ LCD TV AOC L42H831&L47H831
19
5. Repair Flow Chart
1. No Power (No LED indicator)
2. Can not start (No LED indicator)
NG
Re
p
air ke
y
board or remote control
OK
Check
p
ower su
pp
l
y
for main board
NG
Re
p
lace the failure com
p
onent
Check U403
NG
Re
p
lace U403
OK
OK
Check ke
y
board or remote control
Check I
2
C communication
Can not start
OK
NG
Check power cord and board interface
Plug in power cord and interface
OK
Check F901, BD901,C905
NG
Replace F901,BD901, C905
OK
Check voltage of IC902
Check D907,C921,C923,IC905,IC906
NG
Check Q901, IC902
OK
Check T901
OK
Replace T901
NG
NG
Replace D907,C921,C923,IC905,IC906