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138 BDL4785SL LCD
Audio output is no sound
Check Audio board power 12V is
correctly?
Check control pin
AUDIO_SW_SE1' 2 operation
is normal
Check mute pin
AUDIO_VOL_ON is high or low
To measure audio board U1
output waveform (1K Hz
sinewave)
To measure audio board U1
output waveform
Yes
No
Yes
No
Yes
No
Yes
No
Repair Flow Chart
Check GPIO control pin (R277, R278) status
Check GPIO control pin(R492) status
Check audio board U1 soldering or change
another chip
Check audio board U6 (Power AMP)
soldering or change another chip
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