Haier L42A9 Service Manual page 23

No Power (No LED Indicator)
Check power cord and board interface
OK
Check F901, BD901, C929
OK
Check IC901
OK
Check T901
OK
Check D910, C945, C946, C947
No Display (LED Indicator Green)
Check the source
Check LVDS cable
Check IC904 circuit
Check D907, D904
NG
NG
NG
Replace T901
NG
NG
OK
NG
OK
OK
Check IC902
OK
NG
Check T902
OK
NG
OK
NG
Check U400
OK
NG
Check panel
NG
Plug in power cord and interface
Replace F901 or BD901 or C929
Replace IC901
Replace D910 or C945 or C946 or C947
Reset source
Reset LVDS cable
NG
Replace IC904 or the correlative part
NG
Replace IC902 or the correlative part
Replace T902
Replace D907, D904
Replace main board
Replace panel
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