Service Manual
Model No.:
No sound but have picture
Check if there is
sound input signal
No
Check the input source
Yes
No
Check if there is sound from the earphone
Yes
No
Check if Pin1 Pin2 of UD4(12V) is normal
Check the audio input circuit
between UD4 and U48
Check the Mute circuit between
UD4 and U48
Yes
No
Check if there is output at Pin1
、
Pin2 of J17
Check the circuit between
UD4 and J17
Check the
speakers
Still having problems
Change Mainboard
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