pSr 770 no sound from keys

[Tonny j]

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

 

[Biggles]

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.

 

[Tonny j]

I think speaker are on reason being..if I tap on the metronomne tap it's sound the metronomne

 

[Tonny j]

Hi ..where can i buy ics for piano..any link?