pSr 770 no sound from keys


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Hi ..I have a Yamaha psr770 whose keys don't produce sound pus some tabs like play/stop beat. Olny the metronome tab can produce sound..I tried opening it and looked at the EMKS signal input to main motherboard..so during the troubleshooting , from no we're I short terminal of an ic just opposite the buttons EKMS cable inputs to main board and the circuit worked perfectly well but after 6 hours the problem was realized again
 

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Check in the function menu that the speakers have not been turned off.
You could try a factory reset.
The 770 is now quite an old model and may well not be worth sending it to a repair shop.
 
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I think speaker are on reason being..if I tap on the metronomne tap it's sound the metronomne
 
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