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Re: OBC display garbage (archive)

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Posted by Max Fretter (NZ) on December 30, 2000 at 02:39:32:

In Reply to: OBC display garbage posted by Paul Ash on December 29, 2000 at 10:43:06:

If it's black blobs around the edge I'd say the LCD is dead - have the same problem on the clock/gearshift LCDs on my BMW bike at the moment. I think loss of pressure makes the crystals go non-polarised and so appear black..

Cause could be cold, but also age as the edges can lose integrity. Solution depends on

- can you get a replacement LCD screen to suit as a spare? It would have to be an EXACT match for the connections short of some severe micro-surgery and hacking of your dash

- Type of fitting that BMW used to drive the LCD. The internal electrodes are gold sintered into the glass so thinly it's transparent. Some mountings have legs, but the more complex (read more dots/elements) have finer connections, so they use a jelly-rubber-carbon-contact strip. Depends on if you can get the LCD away from the main PCB to put in the new one.

- how confident you are with ESD precautions: the driver for that LCD will be an LSI IC and so easily blown - and not replaceable if it's a surface mount.

Not happy thoughts, sorry...

Max F

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