Have a go at tracing the audio circuitry from the Tuner or Scart Jack, with
the use of a good schematic. Probably find either a switching or muting
circuit at fault. Seems strange that it would only affect the Tuner and
Scart specifically.
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I have a Panasonic TX-25X1 tv which has developed a fault, the sound
only works through composite inputs as scarts and tuner have no sound.
everything else works fine
Any suggestions welcome