Yamaha DGX640 NO SOUND - How to repair faulty electric piano that has no sound from speakers 

wow - Excellent . Capacitor C207 =107uf Replacement. Thank you.

Thank you, I had the keynote extender thing in the headphone jack like a jackass.

Thank you for making this. My keyboard is back in business. Same exact capacitor. Must be at a stressful spot in the circuit.

Thanks a million! I'd just followed your steps to fix my electric piano, it works again!

Thanks, I just repaired my Yamaha PSR E333 thanks to your video. Three capacitors were OL.

To be on the safe side I replaced all capacitors on the amplifier board and it is perfect. Million thanks again for sharing your guide, the cost of the new capacitors and thus the repair was only 3 euros.

Another brilliant video - and you can play the piano beautifully too! Excellent. 👍😎

"I like how smart you are. I appreciate you."

There are many videos that give the illusion you are going to get some info out of them, but they are worthless as many do not explain how to go about testing and resolving the issue. Well done in your approach and explanation. The amp section should be the first to be tested, when there is no sound, and caps are notorious for going bad especially if you have had the keyboard for over 10 years. Sometimes visual inspection reveal the puffy bad ones, but this is not always the case. On my PSR S910, the power input/amp section had a bad power cap 6800 uf it was reading around 600 uf I lost sound while fixing the input mic section that goes through a dual op amp on the same board, similar to your board but larger. I took that dual op amp out of the circuit to test it using an op amp test circuit, I thought it was bad, but it actually turned out to be good, however the main cap at the power input was bad, this explains why sometime my keyboard had a delay in turning on which I thought was the external power supply adapter but that was not the case. I am also testing other small caps individually since my keyboard is way over 10 years old and I love it, so I decided to fix it and get it back in working order again. I am just hoping I don't have to replace the amp chips on this board after I replace the bad cap (s). I suspect it is the main cap that delivers power to the voltage regulator that powers the rest of the chips on that board, but the voltage regulator checked also fine. I also just replaced the rubber carbon key contact strips with new original Yamaha replacements and was hoping to be playing it but looks like it is going to need more time to get working again. Cheers!

Thank you so much!!! Worked well for me

Thanks so very much. I have a Roland HP2900G but this gives me some amo on what to look for. 😊

Thank you so much for posting this video. My daughter experienced the same issue with the exact same keyboard. Your step by step explanations were very helpful. Got her up and running again 10 minutes after we received the capacitor in the mail. God bless.

Gracias Turners Workshop por el tutorial! Con el multimetro correcto y paciencia se puede reparar!

We’ll done mate. I learned a bunch from this. 😊

Wow my friend your talents never end brilliant

I have the same piano with the exact same symptoms. I was hating the idea of just throwing it away.You've given me a good idea of what the problem likely is, so hopefully I can fix it. Thanks!

I spent 1 € and now IT WORKS!! GREAT!!! I love you!

yes it was helpful thanks!!

Thank you it works

Thank You for your video. Exactly same issue. Fixed it using 25V capacitor. I guess there is some problem that exactly same one dies.

Thank you so much. I did not have to troubleshoot my daughter's KB since you've nailed the problem, which I confirmed. Though I did not have the exact cap, I used the one I had handy: 150 uF, 35V, polymer. I think that 'overkill' would not hurt :) Cheers!

Yay nice one,I should drive down in my smiley camper with my guitar for a jam😂 we could start a band & call it the smilers😊 great fix my friend and another instrument saved from the land fill 👍

Load of thanks my dear brother ❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤ nicky james from INDIA

Nice video, I have a yamaha prs3000, everything working but no sound, must check my caps ,thanks again sir

Thanks for you video, super useful. I identified 3 faulty capacitor on my board but I don't know how to look for a replacement as there isn't much details on them :/ I can't find capacitor specs for a DGX505 :(

Hello! All right! So it seems like I have got same problem on a DGX640 I just got in my music store from a customer who didn't want it anywmore. I brought it for repair in a specialized service from Yamaha in Belgium. I would be glad if it's only one capacitor to replace. Thank you for the video!

Thump, maybe my solder joint weren't good enough. Have to check it. Otherwise works fine. Thank you again. Had my 640 for about 13yrs, first time it ever had a hiccup. I was playing it and actually heard it fry the cap and shut down.

Thanks!

👍🤓👍Muchos Dankeschön!!!

Thank you soo much for this, I just completed the same repair following your guide... And it worked!

Very informative video. Do you have any similar videos for a Yamaha Clavinova CLP300? I have one that the volume slide is not working and you can just faintly hear the notes when a key is depressed.

I see a laser cutter 😆 your man cave is similar to the one I have haha good fix. Will be nice to see some laser cutting videos 😛

Hi Turner, can you play over the hills and far away (only Joking) you know your stuff mate interesting video I always knew you were talented cheers take care.

Wire ends are tinned, and fit fine into the sockets. Just gotta be careful.

Found one on the side of the road. Not this brand, but this is going to help. When powered on some lights come on, but no sound. Thank you for sharing.

Thanks for that insight. I have a korg Kross 2, with a intermediate sound drop while playing. The sound comes and go sporadically as I'm playing. So, based on your video, you mentioned early on that it can be interference from a head phone adaptor in the head phone jack / or a faulty capacitor. Is that considered an audio interface motherboard where the faulty capapcitor is located? Also can a faulty capacitor make the sounds sporadically drop as you're playing the keyboard and then suddenly return back to normal again? Thanks for your insight. Best wishes. Special thanks again.

Thank you so much for the video!!! I have a Yamaha ypg-625, technically identical to the one you’re sharing in the video. The issue I’m having is that the volume is very low. I can’t really pinpoint that there’s anything wrong with the caps on the power board. Could it be that a capacitor could be “almost” or “half” defective and is causing the speaker volume to be low? Would appreciate any and all help. Thank you.

Saludos a todos. Pude reparar el piano reemplazando el C-208 ya que el C-207 se encontró en buenas condiciones. Espero sirva para referencia.

Hi we have a DGX 660 in our church and it has a volume but not loud. At max it just sounds at like 40%. Is it a capacitornissue too?

Thank you so much for this guide, it's giving me hope! Do you remember how hot you heated the soldering iron? I'm inexperienced with soldering, so I'm not completely sure what the problem is, but the solder gluing the capacitor to my keyboard's circuit board (the exact same model as yours) does not seem to want to melt for me at all in the temperature ranges I found advisable.

Hi, this video helped me resolve the completely no sound issue, but now the piano keys are significantly softer than any other sound made by the piano (even the metronome). Confirmed that the speakers overall working fine as the demo music is still decent volume, but any sound generated from me pressing the keys are extremely soft. Any possible ideas what else might cause this symptom?

Hi hope you can help. I've just unpacked my Yamaha CP300 stage piano it was in storage for about 5 months. Switched on but the board is non responsive. I checked the speaker button which was on but nothing from board. I checked the preset song which to my surprise played and was able to adjust the sound using the volume and master equalizer. But still nothing coming from the board. The keyboard was stored in a flight case which is very secure and was clean when I took it out. I'm a bit perplexed what's causing the problem. Any ideas? You help would be greatly appreciated.

Thank you very much, great video which can potentially save me a lot of money. Do you happen to remember or know the values of the capacitor on the amplifier board?

Hi Turner, great video! I have a problem with my Yamaha psr-e373 (only 6 months old). While I was away for a few days I forgot to pull the plug out and my cat lied on it and turned it on... (the neighbor turned it off) ...but the worst part is that the cat also urinated on the very left end (not much, just a spray, not near the motherboard). It had already dried up and I didn't see it at first so I had turned the keyboard on to play. Then I realised something was wrong. Luckily most keys work perfectly fine, also in the left corner... but the weird thing is that the third white key of every chord doesn't work... and also the same black key of every chord doesn't give a sound. Sometimes if I press all the white keys, that don't work, at the same time a hesitant tone comes out... delayed. Or when I press one of the keys very softly suddenly a hard tone comes out. The few black keys do not work at all... If I would open it up and clean the inside of the keyboard very carefully, would there be a chance that it will work properly again? Or is an electronic part damaged? I'm really worried...

Hi, tank you for that fix. So far it worked! But now i only have sound on the left channel... on the speakers as well as on the headphones.. can you guess what Problem that could be? Thanks a lot, best regards, tobi

Hello ! really informative video ! I have an old Yamaha keyboard PC-100. There is no sound if i play it under not normal function. However, if i play it under chord function, it works perfectly. Could you identify what the problem it could be ?

👍

I have this exact one but for mine it’s only specific keys not work namely the d and c# on the lower side of the keyboard any idea what that might be ? I checked the capacitors and cleaned any idea where the problem is ? 😊

Thank you. Replaced the exact same capacitor, on my DGX 640, and It works again, it does now have a noticeable thump when turning off the power switch, even with the volume all the way down. Didn't have that before ?? Perhaps the new capacitor, ?

👍👍👍

For some time now, when I touch the body (except for the wooden part) or when I hit the keys a little hard, my piano makes a sound like a marble. This issue gets worse when I hold the pedal and play music.(I tried even when the piano is turned off and there is no electric current in it, it still makes this sound). What is the problem? My piano model is clp725

same as my yamaha piagerro np30 with power but no sound, i try to connect it to my amp and check the headphone and output jack but still no sound. I reset it also but still no sound.

Feel dumb asking this, maybe u mentioned it... But it's not possible to measure capacitor using those multi meter probes by touching the solder points? Or is there a lot more going on in there with it connected to the board still?

Hello! Great video! Question - In order to clean the speakers under the grill, does one need to take out all the screws as well, or is there a way to pop the grill off? Thanks so much!!

Thanks for this video. I have a dgx 640 and none of the keys make any sound. But if I play a beat it works fine with sound. I tried resetting by pressing the last key but it doesn't recognize it either. Any ideas please for me to diagnose the issue. Thanks in advance

I took the exact same resistor out and didn’t replace it. Works perfectly without a resistor.

Hi Turner, this is going to be a long shot but it doesn't hurt to ask. I have a DGX-660 that works well electronically, but I get an annoying buzz from the right speaker on certain notes. If I press down on the grill, the buzzing disappears. I already opened it up but couldn't find anything loose that may cause that, but I tightened any speaker-related screws just to be safe, to no avail. The grills themselves are not screwed down, rather that have those "twisted tabs" you also have on this model (visible at 3:46). Has something similar ever happened to you? Other than trying to straighten those tabs to remove the grill and possibly add some foam in between, I'm not sure what else I could try. Any advice would be most welcome! Thanks in advance.

Anyone have advice if the keyboard is dead but the sound is still good on the demos etc?

Bonjour, merci pour cette vidéo, j'espère que je vais résoudre mon problème identique. Quelle est la température de votre fer à souder ? Merci.

I have a different problem. Yamaha p-70. Bought it recently and Only the left speaker work and not the right one. U think could be blown speaker ? Or is this symptom issue ? Anybody got a clie?

First off huge thanks for posting this video! I followed the exact same steps and now the sound is back! However, there is now a secondary issue. The volume of both L and R speakers is super low even when I turned the volume knob to max. When I plug in my headset the volume is normal. Given both speakers have low volume, I suspect the issue is not speaker itself but another circuit issue such as a depleted capacitor. Any thoughts or advice would be really appreciated!

Meu autofalante esta funcionando somente de um lado. Sabe dizer o problema

Question? When checking the capacitors keyboard needs to be unplugged right?

Interesting that Yamaha had wires to connect stuff and not wires attached to plugs. Was a bit worried about damaging the wire ends like that.

1 more reset 1 key and tre first black keys hold all down and power up all set to default also 2 steps

I've replaced C207 but speakers still low any advise thank you so much. Dgx620

Hi, I have the same digital piano and it's giving me an issue, I wonder if you could guess what's causing it. Whenever I play a big chord or arpeggio, let's say E major, the piano makes a B flat sound, or it makes a B sound for F minor, or a A flat sound for G minor, etc. I checked the troubleshooting section of the manual and it says the P.A.T. button (performance assistant technology) could be the cause but it's not solving my issue. Do you have any idea on what could be going on?

Hi. I have Kawai 31 digital piano. He doesn't give any sound. Panel works goed. But no sound coming. I have tested the capacitors on sound power amplifier with Peak ESR 70 gold. Here are the figures

I'm about to try this on mine (same symptoms). But I notice that my speakers make a classic slight "thump" when powering off, which to my previous experience would suggest that the amp is getting some juice. Did your example make a thump at all when powered on or off, or was it silent?

Tengo un dgx 620 .Lo que el tiene es que el sonido al maximo nivel es muy bajo.Que será?Ayudame por favor.

Hi, I have an e-piano that has sound, but veeeeery low. (On headphones as well.) Do you have an idea, what might be the cause? Would be great! ❤

mine can only audio to the left speaker/ left headphone. What do you think the problem is?

i have a yamaha ypg 635 and my left speakers arent working but the right sound fine

Shhhh...don't tell anyone. This is the 3rd one I've fixed from this video.

I have Kawai CN31 piano. It gives no sound. I have checked the capacitors on sound amplifier of my digital piano and got the following results in ESR levels. I used the peak ATLAS ESR70 gold. 10000 uF 25V - ESR 0.01 ohm - uF reading 8811uF 2200 uF 25V - ESR 0.02 ohm- uF reading 2015uF 470 uF 10V - ESR 0.20 ohm- uF reading 479uF 100 uF 25V - ESR 0.43 ohm- uF reading 98uF 47 uF 16V - ESR 0.64 ohm- uF reading 50uF 10 uF 16V - ESR 1.01 ohm- uF reading 11uF 1 uF 50V - ESR 1.10 ohm- uF reading 0.98uF I am especially suspicious about theIr results for 10 micro and 1 micro F. They should be around 8 and 5 respectively. Do these results mean that I need to change the 10 micro and 1 micro D capacitors? Thanks for your replies. Tan

All my capacitors were working but still no sound 😢

I have problem with my keyboard, do you have maybe facebook or instagram to contact you