advice on replacing ribbon cable fro PCB to LCD?

[blackjetrock]

(Yesterday 05:17 PM)Keith Ostertag Wrote:  Hello blackjetrock and thanks so much for your detailed response! I can imagine you spent quite a bit of time and effort researching and playing with this, and it is a great resource for the forum to have your comments for the archive! The links are very helpful. I find the bus sniffing fascinating but beyond my abilities.

It's really to bad that these LCD ribbon cable problems are so common, and that there is no easy fix.

Yes, they do seem to degrade after a while. Even if the machine is working, once the case is opened you may find the cable detaches. I did indeed spend a lot of time and effort on trying to fix these things.

Quote:The only reason I thought I might attempt this repair is my ribbon cable has a much larger pitch than the one shown in your links, so that might make it easier to connect with the 3M tape? In your link Menadue speculates that his cable's pitch may have been too fine for the 3M tape.

I don't know how pitch is determined- is it the distance between trace centers? Mine seem to be 3mm.

Attached is a photo of the cable I am working with.

Keith

https://imgur.com/a/HzlAahx

The figure of 0.4mm is a the gap between conductors I think, so you shpuld be OK. If there's some plastic that holds the tape and connector together then that's good. You also need good carbon conductors, and from the photo that looks quite good. You might also be able to find an automotive repair cable that has the same or a higher pitch than the cable and use that. A higher pitch iis fine as you just have multiple conductors for pads.