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26LX2D-UA (CHASSIS:AL-04DA) - LG TV Service Manual (repair manual). Page 14

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- 14 -
No sound
Replace A_board
Replace Speaker
Replace
D_power_board
Check Sound supply:
A_board P804 #1, 18V
Speaker 
output check :
Is there waveform 
of P601 #1?
Measure
A_power board 
trans output:
18V at power_board 
CN803 #1
Check 
If A_board 18V
is short-circuited.
Resistance btween A_board
P821 Pin No.2 
and 3 infnity?
FAIL
PASS
PASS
FAIL
FAIL
Replace A_board
FAIL
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