Suggestions to Repair Fade/Poor Contact in LCD Display

Thankyou for taking time to reply.

Its has a fresh battery in unit. I am fairly sure its not zerba strip but rather a ribbon cable attached to LCD but I will look more carefully so see for sure. Thanks.

I think it may have gotten wet. Water destroys the polarizer.

I did, once successfully repair a watch with a piece of polarizing film. e.g. http://www.edmundoptics.com/optics/polarizers/linear-polarizers/high-contrast-linear-polarizing-film/3435

To see if it's the issue grab a pair of polarized sunglasses and rotate them as your looking through the lenses. The ones missing the polorization should view. As you continue to rotate the glasses, the entire display should basically go dark for a good display. I "forget" if the missing segments will appear.

Thanks for reply. I will try that when I find a bit of polarizing film. How would water damage it? I thought polarizing material was plastic?

Another possibility is that you have cracked solder joints or some component failure. One troubleshooter I know would tap various components with a pencil eraser until it did something to the circuit to make it work better. That does not always work.

It looks like current starvation to me. What is wrong with the drive voltage? That is the question you may need to answer. Or, it could be that the LCD is damaged beyond repair. Look up some LCD specifications. It may be helpful to understand what it should be doing when it is working correctly.

Thanks for your reply. I have tried applying small amounts of pressure on the contacts and it does not change situation. Tried cleaning with some alcohol and no improvement. On the original photo there is a white spot below the h and that seems inside the glass. If I can figure out the lcd connections I might have a go at measuring voltages going to lcd. Its not of vast importance but it would be nice to get this dosimeter working fully.

Thanks for your post.

The plastic is coated. I dumped my watch in Pepsi and it;s doing the same thing, However, the sunglasses I have aren't polarized.

Take the instrument to a store that sells sunglasses and test it there.

Thanks. I did find some polarising material and used it and rotated it and it does not help. I did not know the polarising was done with a coating... thanks thats a good thing to know.