Operating instructions

42″&47″ LCD TV AOC L42H831&L47H831
20
3. No display (LED indicator Green )
Check 12V
power supply
Check Panel
NG
Replace Panel
Check back light is OK
OK
Check LVDS cable
and connector
OK
Check U403
NG
Replace U403
OK
Check U401
NG
Replace U401
NG
NG
OK
Check BL-ON/OFF signal
Check PS
signal
OK
OK
Check power
board
NG
NG
NG
Check Q705、Q704
Replace Q705、Q704