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I HAVE A Yamaha PSR 260. About 8 years old. Recently it became defective.: Only the display lights up . No sound. No response to any button. When volume control is turned, I can hear the faint rustle on the speaker due to the pot. Maybe one or more of following in main PCB - PCB Yamaha XY 389 #2686 - is faulty ? IC 702 - 2000 Yamaha a 42 pin IC XY 43520 IC 501 - BA 5417 030 L78 IC 102 - PQO 5RD11 Sharp 27 M7 Could they be the fault ? How much would they cost.
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You should be using the Yamaha PA-3B adapter. The unit draws 9 watts... so at 10 volts a 1 amp adapter would be great. Make sure the polarity is correct.
Likely a connection to the backlight is being broken. Tap on the unoit and see if it pops back on. Illuminate screen with a flashlight and see if the characters can be seen when screen is faded. If they can, then the backlight is the problem... IF NOT then the display may be bad... This has been a problem and if you are under warranty, excersise it immediately... else replacement of the display is relatively expensive.
Your adapter should be a 12 volt DC delivering 2 amps (2000 ma). If the adapter is too small, you will have the symptoms you are seeing. Make sure the polarity is correct. DO NOT use the so called "universal adapters".
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