Hi BEBOP,
Thanks. I would do that. In fact i would have preferrd to take it to the yamaha guys here, had not been for that bad experience. I had a left speaker jarring problem with a PSR 260 and when i took it to the yam authorised showroom , they told me that i would have to replace an IC, which would take me three weeks to get it shipped from the US plus the cost to do that was something very high. But common sense made me take it to an ordinary electronic servise place where the good guy told me that it was a problem of dry connections. He cleaned it and soldered the connection again. Its been three years and it still works fine. That is why i dont wanna take it there . But i will do that procedure you told me to. My board is working fine now but dont know when it wil get screwed up again. I wil take it soon especialy when u said the time to take it is 'NOW'
Thanks again for your advice.