26LX2D-UA (CHASSIS:AL-04DA) - LG TV Service Manual (repair manual). Page 12

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TROUBLESHOOTING
No power
Connect the 
connectors.
Replace Power_board 
Push the  
POWER ON key 
O.K
Check 
the condition of power
Related connectors.
FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
PASS
PASS
PASS
PASS
PASS
Measure the 
stand_by voltage :
D_board P1401 5
th
pin 
ST_ 6V
Check the 
power board 
Digital ref. voltage :
Power board 
CN804 1th pin 24V
Replace the
Power_board
Replace Power board 
Replace D_board
Measure D_board 
Standby voltage  :
D_board P818 
6 pin 6V
Check 
Power_board analog ref.
voltage A_board 
P801 1th pin 24V
Measure 
Power On signal level  :
A_board P801 
2nd pin > 5V
Measure
D_board supply voltage :
P1402 1th pin 3V
8th 6V, 10th 12V
Dose the 
set turn on normally?
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