AC display is blank.

[CampingCajun]

I have 2 Carrier Air V units. They work fine but the problem is in the hand held remotes for them. The display on both are almost completely blank. If I shine a light on them at certain angles I can barely read them. Is there a fix or solution short of replacing them? I have installed new batteries but that didn't help. Since Carrier is no longer in the RV AC business parts may be hard to find.
Any help or advice is appreciated.

[scep]

The "contrast" on lcd's is set by a bias voltage.

There may be an adjustable pot inside of the handheld. Try splitting the case and look for something that has a short shaft or even a flush shaft with a slot in it. Try turning it one way or the other to see if it helps.

[CampingCajun]

Problem solved. Put in some newer fresh batteries & both remotes working now. I guess these things are really sensitive to low voltage.