Bought my dr 880 from music store with no power adapter. Ordered 14v adapter off internet. Screen lights up but is blank no words no sounds

take it appart. there is a conductive rubber between lcd pannel and the pcb use widow washer fluid without amonia to clean it

Blank screen and no sound, can occur because of damage to the power supply circuit in the PSR-E423.
Circuit power supply is still working but the voltage is not sufficient. This is indicated by a lit LCD screen but does not appear any character, and the sound did not exist. It is a matter of hardwares, so it can not be reset by software.
Should be fixed to the experts.
Do you use the original adapter? Also check the voltage.
Maybe, it is not known why, a voltage adapter has been dropped.

I think the backlight of your screen is out, which can be complicated. I think it is working but just not lighting up. I'll look this thing up and let you know more later. Please send me a make and model number when you can.

IM LOOKING FOR A LCD BACKLIGTH REPLACEMENT PART

Most of the problems with these type units are due to dead batteries or incorrect power adapters and broken power jacks, Check for those things use ONLY the original type power adapter.

Make sure you use ONLY the correct adapter for power. Too small an adapter might cause it to light up but will not operate the unit. The correct adapter should say AD12 on it. It is a 2 volt, center pin minus, and probably 1 or 2 amps capability. Nine volt adapters used with pedals or universal adapters will NOT work with the WK3000.

Did you just use adapters or actual step-down transformers?
A lot of equipment today is 110/220 auto-switching, but if you get something built for 110V (120V, 100V, markings may vary) only, then you need more than an adapter, you need a transformer!

I'm a Zoom 9000 owner (since '93, I think) Did you try batteries only? Are you plugging the guitar into the "in / power" jack and not mistakenly using another jack? When you plug in the guitar, in to the Zoom 9000 does the window come on with the settings shown? Sorry, I know some of these are obvious but always the chance of us being human. If all that seems fine, then I would read though a manual to see if maybe it is a setting problem, i.e., sound somehow got inadvertently turned off. If you don't have one, an internet search will lead you to one. Sorry, wish I knew more.

It is likely the adapter is underpowered for the pedal. Get the correct adapter .