Display light not working - Roland Boss DR 880 Dr Rhythm Drum Machine

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try resoldering the flat cable on thescreen

I fixed mine it had the same issue bye opening it up by taking the screws out and carefully open it up and look for any corrosion or buildup on the circuit board then take a q-tip and dip it into isopropyl alcohol rubbing alcohol and just clean up any corrosion on the boards then look for the ribbon cable connection that is connected to the display try pushing the connector in to make sure it's firmly set in there on both ends of it and put it back together. I don't know what caused the screen to not display the actual text because I bought it used at a swap meet but I tried this and it worked.

The first thing to check is if you have reasonable length lines to the lights you SHOULD HAVE A TERMINATOR resistor at the ends. Without this, data reflections can corrupt the data stream and give WILD results.

Here is a link discussing the need: http://www.controlbooth.com/forums/lighting-electrics/5229-dmx-termination-dummies.html

If other lights are on, I have seen a case where the display does not light for a time, especially if it is cold. The gas in the display takes some time to light up like some neon bulbs... the effects should still work, you just can't see the display. Usually the display will eventually come on after a few minutes after being off for long periods. Sometimes one can encourage the display by external radiation such as a cell phone in close proximity.

See if the FX input indicator is functioning.

If the electronics of the DSP/FX is dead, troubleshooting it is not a DIY unless you have special test equipment. The unit uses two 57002 DSP's controlled by an 80C32 micorprocessor. Beyond checking that the 80C32 is operating and busses have activity, you probably won't be able to do any fruitfull troubleshooting

If NO lights come on in this unit, then the power supply has fried and you don't want that as it is likely caused by the rear power amp arcing out.. Lots of work to repair. Since rest is working this is not the case with yours. ALWAYS be careful to insure speaker leads are solid with this amp as an intermitent lead can blow this amp easily.

Behringer does not release their schematics to non-agents...

Hello,

the problem is from the display IC of your unit. You nee to change the display IC for your unit to display again.

If you cannot do it yourself, maybe you should consult an expert to help you have it fixed.

Good luck.

Check controller cable between base and remote. Look for bent pins. If appears ok, you may have an internal loose connection. Try and narrow down if loose section is on base or remote. You could have it resoldered if needed. [email protected]

If all other controls are working, check IF they have a "Contrast" setting for the display. When those are at end of range, the display often is blank.

Sorry, but many of the low end keyboards do NOT have backlights. This is especially true of those that have the capability of running off batteries like the CTK-496.

The display in this is a reflectance type that needs ambient lighting to view.