restoring liquid crystal display
 

The liquid crystal displays on both of our landline phones have gone
illegible. Is there a way to restore them?

Thanks.

restoring liquid crystal display
 

restoring liquid crystal display
 

On 5/17/2008 6:23 AM spake thus:

The liquid crystal displays on both of our landline phones have gone
illegible. Is there a way to restore them?

I have the same problem with my El Cheapo digital voltmeter; part of the
last digit got creamed when water got sprayed on the unit, and now
doesn't display. All else works fine (I can usually just ignore that
last digit anyhow). Any fix for this?


--
The best argument against democracy is a five-minute
conversation with the average voter.

- Attributed to Winston Churchill

restoring liquid crystal display
 

David Nebenzahl wrote:
On 5/17/2008 6:23 AM spake thus:

The liquid crystal displays on both of our landline phones have gone
illegible. Is there a way to restore them?

I have the same problem with my El Cheapo digital voltmeter; part of the
last digit got creamed when water got sprayed on the unit, and now
doesn't display. All else works fine (I can usually just ignore that
last digit anyhow). Any fix for this?



probably corrosion or the zebra strip lost connection
between the pc board and glass lcd. zebra strip is a rubber
strip with many thin conductive layers.

you might try a little pressure at the edge of the display
first to see if the zebra strip might slide a little and
make contact again. there is a very real possibility you
might never get the zebra strip back in place if you try the
following. does take some practice.

disassemble the pc board/zebra strip/glass lcd sandwich.
clean the corrosion at either side of the zebra strip with
50% and/or 100% isopropl). carefully reassemble. The z
strip depends on even pressure along it's length to connect
the pads on the pc board to the invisible pads on the glass.

__________ ____________ pc pads

||||||||||||||||||||||||||| z strip
___________ _____________ lcd pads on glass

(you're looking at the EDGE of the pc board and lcd)

-- larry/dallas

restoring liquid crystal display
 

On 5/17/2008 5:24 PM larry spake thus:

David Nebenzahl wrote:

On 5/17/2008 6:23 AM spake thus:

The liquid crystal displays on both of our landline phones have gone
illegible. Is there a way to restore them?

I have the same problem with my El Cheapo digital voltmeter; part of the
last digit got creamed when water got sprayed on the unit, and now
doesn't display. All else works fine (I can usually just ignore that
last digit anyhow). Any fix for this?

probably corrosion or the zebra strip lost connection
between the pc board and glass lcd. zebra strip is a rubber
strip with many thin conductive layers.

you might try a little pressure at the edge of the display
first to see if the zebra strip might slide a little and
make contact again. there is a very real possibility you
might never get the zebra strip back in place if you try the
following. does take some practice.

[snip procedure]

Yes, I know about those connectors, having taken a lot of LCD devices
apart (but didn't know what they were called). And thanks for the
suggestion. I think I'll just leave it alone; the chances are that it
wouldn't work at all if I tried to rebuild it. I'm pretty sure that is
where the problem is as you suggest.

I see that my surplus catalog (Electronix.com) sells those same DVMs for
$7.95. Not worth tinkering with.


--
The best argument against democracy is a five-minute
conversation with the average voter.

- Attributed to Winston Churchill

restoring liquid crystal display
 

"David Nebenzahl" wrote in message
s.com...
On 5/17/2008 5:24 PM larry spake thus:

David Nebenzahl wrote:

On 5/17/2008 6:23 AM spake thus:

The liquid crystal displays on both of our landline phones have gone
illegible. Is there a way to restore them?

I have the same problem with my El Cheapo digital voltmeter; part of the
last digit got creamed when water got sprayed on the unit, and now doesn't
display. All else works fine (I can usually just ignore that last digit
anyhow). Any fix for this?

probably corrosion or the zebra strip lost connection between the pc board
and glass lcd. zebra strip is a rubber strip with many thin conductive
layers.

you might try a little pressure at the edge of the display first to see if
the zebra strip might slide a little and make contact again. there is a very
real possibility you might never get the zebra strip back in place if you try
the following. does take some practice.

[snip procedure]

Yes, I know about those connectors, having taken a lot of LCD devices apart
(but didn't know what they were called). And thanks for the suggestion. I
think I'll just leave it alone; the chances are that it wouldn't work at all
if I tried to rebuild it. I'm pretty sure that is where the problem is as you
suggest.


But you can learn something by trying.


I see that my surplus catalog (Electronix.com) sells those same DVMs for
$7.95. Not worth tinkering with.

Even more so.

I hate to see how much easily repairable electronics is discarded because
something simple to fix failed.

But then again, I recently got a freeby iPod from a craigslist posting. Ten
minutes of googling, and I found how to recover from the error.