[sdiy] Why do LCDs die?

Gordonjcp gordonjcp at gjcp.net
Mon Dec 31 13:48:49 CET 2018

On Sun, Dec 30, 2018 at 11:32:24PM -0800, rsdio at audiobanshee.com wrote:
> As a remotely related example, I have a Fluke 87 meter with an LCD display. That thing started getting dim after about 15 or 20 years of use, so I took it apart to take a look at how it was put together. Turns out that they used rubber impregnated with carbon for the contacts between the PCB and the LCD. On a hunch, I purchased some deionized water and carefully cleaned both the carbonized rubber contacts and the PCB contacts on both sides. After thoroughly drying the pieces, I reassembled it and the display was just as sharp in contrast as when it was new. What’s really interesting is that my makeshift repair was done more than 20 years ago, and it’s still just as readable. Perhaps I lived in more humid conditions before?

A guy on the Range Rover forum I run had a huge batch of zebra strip
made for the heater LCD panels, which lose segments over time.  Once
you've taken out all 426 screws holding the heater controller together,
it's a quick and easy cure.


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