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Power on. record light stays on won't do anything

Power it om green light red light stay on, nothing on blue display. it;s blank

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Blue LCD screen

I had the exact problem, mine was a YPG 535 brand new in box I put everything together with stand and FC4 pedal. When i got ready to play just a blue screen and none of the red lights came on and no sound, I notice when i was messing with the on and standby button hopeing it would work the speakers would make a popping noise I personly thought it was a manufacturing defect.....i'm sending it back to have it replace. I never had problems with yamaha products but seems like more and more defects are happing with newer portable grand series!

Feb 24, 2014 | Yamaha DGX 640 Keyboard Arranger

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Only blue light with blank display on power on

Dear Joseph,

I had similar problem with my DGX620. In my case the display sometimes got blue and sometimes worked fine. The cause was a bad contact of the display flat cable.
I opened the DGX620 and then I cut a small piece of plastic film (35mm negative) with exactly the same width of the flat, disconnect the flat cable and then reconnected it using the film on the other side (non contact side) to increase the pressure and guarantee a good contact. No more problems from nov-2012 till now.

Good luck !
Paulo de Tarso (Brazil)

Nov 14, 2012 | Yamaha DGX630 - Digital Piano

1 Answer

Limiter light stays on with no sound. powers up fine but again the red limiter light stays on and no sound.

The power amp is likely blown. The limiter also indicates when the amp is out of DC balance.

May 14, 2011 | QSC HPR 153

1 Answer

My Fostex MR-8HD recorder's LCD display won't show me anything when I turn on the recorder. Everything else power's on and works properly. I can even hear it it working. I can't see the LCD display...

Check if the display has a contrast control. When these get turned down, the display is blank. Sometimes they are a littel shaft coming out of the case, other times it is a setting in a menu... how they expect you to see the display to set it in these cases is beyond me...

Oct 22, 2010 | Fostex Mr 8hd CD 8 Track Recorder with CDr

1 Answer

Why do i have no display and the tap tempo light and undo/redo light stays on. nothing else works

This sounds like a pwer supply problem. Verify that you have the CORRECT power supply for the unit. Often these get swapped and incorrect one is connected and sometimes damage is done doing this.

Jul 28, 2010 | Boss Rc 50

1 Answer

My Alesis D4 Drum Module shows squares in the Display screen and both the both the Store and Note Chase light come on and stay on. I have tried both a new power supply and pushing both the Voice and Output...

Open the unit and see if it has a battery that holds the settings. Check the voltage... it should be around 3 volts. If less than 2.5 volts replace it.

Verify the INTERNAL regulated power supply as the external you verified with new unit. The external is likely regulated within the D4 and either due to an overload or bad regulator may be below the voltage to run the processor. It is likely 5 volts and anything over 4.85 would be acceptable.

Jul 27, 2010 | Alesis Sr 16 Stereo Drum Machine

1 Answer

No sound coming out of speakers when turned on

If you get absolutely no sound, not even a pop when changing the standby switch, this probably means the rectifier OR the switch has failed. The red light just means power is getting to the power transformer... probably fuse is OK.

Sep 27, 2009 | Peavey Music

1 Answer

No sound from speakers

Page 8 of the owners manual explains this and suggests that if their procedure fails to take it into an authorized Fender dealer for service. The manual is dowloadable at

Dec 15, 2008 | Fender Passport Deluxe 500watt Sound...

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