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32LX4DC-UB, 32LX4DCS-UB (CHASSIS:LA53A) - LG TV Service Manual (repair manual). Page 14

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TROUBLESHOOTING
No power 
Connector connection
Replace Power_board
Replace Power_board
Power On key
OK
Power supply Check 
connector connection status.
Stand voltage check:
D-board P100+5V-STDBY
Stand voltage check:
A-board P502 #5Pin 5V
Check 15V or 5V 
of Lips
Connection  
of power supply part :
Check wiring status of the 13-pin
connector
Connection  
of power supply part :
Check wiring status of the 15-pin
connector
Power on signal level :
D-board P101 'power0' 3.3V
D_board main voltage:
P100 '+3.3V', '+6V-P', 
'12V-P', '+30V-P'
Fail
Fail
Fail
Fail
Fail
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Replace Power_board
Replace D_board 
MICOM IC101
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