Electronics > Repair
LCD display zapped by static discharge, repairable?
Divarin:
Hi all. This is my first post on this forum I'm looking for some expert advice.
Way back in the early 2000's I bought an MP3 player called a NEO-25 (here's a page describing it: http://www.djzone.net/pg/0008/tf00083.shtml)
It's had a hard life despite my being as careful with it as possible. The battery no longer holds a charge, the power socket had to be re-soldered about 10 times, the power switch is flaky and needs to be halfway between on & off and the big one: One day I touched it and a static discharge went from my fingertip into the LCD screen and ever since then the screen is pretty messed up. Basically all of the "pixels" are darkened but you can barely make out what is on the display if you hold it at just the right angle.
Anyway I put it away in a box and forgot about it but now I want to try to refurb it so that I can use it to load software into various 8-bit micros that use tapes such as a zx spectrum, TRS-80 MC-10, and others.
I can power it by putting 5 volts into the charging port even with no battery so I plan on using a USB power pack there, probably replace the laptop hard drive with a compact flash card since my windows 7 device doesn't recognize it when plugged into USB, but before I even start any of that I'm trying to decide what, if anything, can be done about the LCD screen. I know if the screen was smashed that's pretty much non-repairable but I don't know about zapped screens.
It's probably not repairable and if I am going to use it I'll have to live with the screen as is but I thought I'd reach out to some more knowledgeable folks before I give up.
Any advice is appreciated, thanks.
Here's some pictures for reference:
Haenk:
I think it might have zapped the contrast adjustment. The display otherwise seem to work (aka "good thing, the controller is alive and working").
Is there a contrast adjustment key combo?
Divarin:
I don't think so, there's nothing about it in the manual.
Divarin:
on the back side of the LCD panel is a number of surface mount resistors. I wonder if one or more of those resistors got zapped if that would affect the contrast. I guess I could desolder each one and test them.
Bud:
Google for '20x4 LCD pinout' to find the contrast adjustment pin number and go from there.
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