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PRS-gx76 power is on but the keyboard makes no sound and does not respond to any key or control

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Http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail.html?CNTID=2117&CTID=205200
http://www.electronicsrepair.net/rec23psr.shtml
http://www2.yamaha.co.jp/manual/pdf/emi/english/port/PSRGX76E.pdf
Download these manuals above they will assist you in repairing.
Ok, well the first place to start is ALWAYS is the Power Supply, so you must check this and see if the Voltages are correct, if this uses an AC/DC Wall adapter, then, check this, you may need a multimeter, set to DC Volts, to do so. If it is OK, then check, inside, from the Power IN socket and work inwards, It may even be a Blown Fuse, DO NOT simply ever just replace a fuse 99 times out of 100, the fuse blows due to a short circuit, or a massive overload, if you do not, Find and Fix, what caused it to blow in the first place, then it will simply blow again. To do any sort of repair to anything electrical or electronic, except for perhaps the most rudimentary of ones, then one MUST have a Service manual, for the exact unit you are working on. There is simply no way of knowing what part numbers are to order any parts maybe needed. Voltages, test & Diagnostic procedures.
It is my professional opinion though that everyone should take their units to their manufacturers approved service center, contacting a local head office, of your unit & getting an approved service center is just SO important, even worth the extra to ship it, you see, at those places, the Engineers, are trained on the equipment you have, they usually have parts on hand, and do the job quicker. Anyway do that and get a "Quote". This way, at least, you'll know whether to repair or replace. I see items like this in my shop from time to time, and mostly they are easy and cheap to repair, they are made extremely well, and unless a power strike, spike, surge etc, or physical damage, they normally are very reliable, also usually it is something to do with the power.

Posted on May 04, 2010

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Posted on Jan 02, 2017

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Does it have onboard speakers?

If so, try to tighten down (fix firmly in place) the wire mesh that protects the speakers, if it's loose, it will vibrate and cause distortion in the sound.

I once had to repair a portasound which sounded really crappy when a group of keys was struck at high volume, and it would only calm down when i fixed the speaker mesh so that it didn't vibrate with loud sounds.

You may want to put some rubber or similar into the groove where the mesh edge fits in to prevent it from vibrating (i solved mine just by tightening up the mesh strips where they protrude into the housing).

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3rq8 (Triarcuate)

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Keyboards that sense the dynamics of playing have two contacts underneath each key. One of those contacts is most probably a bit dirty.
To clean it, you need to open the piano housing, remove the faulty key (you may need to release the keyboard from the base), there are rubber (or another kind of) contacts, similar to those in a remote control. If they are rubber contacts, you need to clean them on the rubber side as well as the tabs on the board under the rubber button with a cotton stick and some ethyl or isopropyl alcohol (don't use acetone, benzene or similar strong solvents, you will damage the rubber).

If they are another kind of contacts (e.g. relay type - metallic, you need to clean them with very fine sandpaper.

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If the contact tabs on the board are damaged, you'll need some "leitsiberlack" - silver repair liquid, this is a similar liquid that contains silver and makes a somewhat solid contact. (i'm not sure about sources for this, but in europe, it's sold by Conrad electronics under the name "leitsilberlack"). You need to apply some but take care not to connect the two halves of the tab or the key will not work properly.

I had a case of identical malfunction on a roland synth (it has rubber contacts) and the cleaning alone solved the problem entirely, hope you can solve it that way yourself.

regards

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