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LG 29FS4ALX Service Manual page 17

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2. AV STEREO/ MONO MODEL
OK
Select correct system in menu
OK
Check the connection of AV
equipment
AV
Does the auto - Program
operate properly
OK
Check the waveform at
pin57, 58 of IC501
OK
Check the waveform at
pin4, 12, of IC601
OK
Check the waveform at
pin6 of IC601
OK
Check the waveform at
pin1, 2, 14, 15 of IC601
OK
NO
NO
NO
NO
Check the voltage at
pin3, 13, of IC601
OK
Check the connection of side
or Front AV Board P201A
OK
Replace IC601
Check TU101 Tuner
Check the voltage of pin3, 9,
16, 43, 86,88,90 of IC501
Check the signal line of SPK-N,P
Check pin5 (mute) of IC501
NO
Check/ Replace
R823, D826
NO
Correct the Board

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