Digest for sci.electronics.repair@googlegroups.com - 3 updates in 3 topics

9:40 AM Penedão
tabbypurr@gmail.com: Aug 17 08:43AM -0700


> My Panasonic nn sf464m has started to do this too. It's only a year old, did anyone find a fix?
 
Usual cause is sagging door due to hinge wear. Maybe you can adjust it & test for leakage & interlock alignment.
Yes, probably too late for those that wanted to know.
tabbypurr@gmail.com: Aug 17 04:17AM -0700

On Thursday, 28 May 2020 20:55:50 UTC+1, Ralph Mowery wrote:
> other similar thing I may have missed like having my fingers across the
> leads.
 
> Ralph ku4pt
 
There's more than one way to read capacitance value. Each method's results are affected differently by ESR & leakage.
 
 
NT
David Farber <farberbear.unspam@aol.com>: Aug 16 07:34PM -0700

I'm working on a a Samsung LN52A750R1FXZA HD TV from 2008. It was
sitting in someone else's storage unit when I inherited it. It was
working OK when it was put into storage. When I went to pick it up, I
noticed it was very heavy and part of the frame had broken loose from
the internal fasteners as if someone tried lifting it by the frame
instead of the chassis. I hooked it up and the picture was terrible and
it just kept power cycling on and off every few seconds. I did some
research and was alerted to the fact that the power supply capacitors
are usually the culprits. I replaced about eight of the caps. Some were
way out of tolerance and others only slightly off. I turned it back on
and there was no improvement. The power was still cycling and the
picture was terrible. I did some more research. I found a post from a
tech that said to remove the T-con board and if that fixes the power
cycling, then replace the T-Con board. I subsequently removed the T-Con
board and sure enough, the TV powered on fine and remained on. I finally
was able to shut off the set with the remote thinking maybe now I could
reinstall the T-Con board and it would power up OK. What the heck,
nothing to lose here. I reinstalled the original T-Con board and now the
set is working just fine but who knows for how long. There is a firmware
upgrade on the Samsung website which I'd like to apply. It comes with
the usual warning that says not to install a version of the firmware
with a lower version number than what's already in the TV. I put in the
USB stick with the downloaded firmware and waited for the TV to ask me
to confirm the update. It said, do you want to update the firmware from
version 999999 to version 1012.2? I'm going to assume here that whatever
the version of the original firmware, it's not v. 999999. Maybe it's
corrupted? The question now is, should I just not bother with the
firmware upgrade or update it anyway?
 
Thanks for your replies.
 
--
David Farber
Los Osos, CA
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