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tech / sci.electronics.repair / Re: Dead Samsung UN55TU8000F

SubjectAuthor
* Dead Samsung UN55TU8000Fkgpup
+- Dead Samsung UN55TU8000FPeter W.
`* Dead Samsung UN55TU8000Fohg...@gmail.com
 `* Dead Samsung UN55TU8000Fkgpup
  `- Dead Samsung UN55TU8000Fohg...@gmail.com

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Dead Samsung UN55TU8000F

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From: kgpupswi...@gmail.com (kgpup)
Subject: Dead Samsung UN55TU8000F
Newsgroups: sci.electronics.repair
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 by: kgpup - Mon, 13 Nov 2023 19:05 UTC

Hi all, when I plug in the aforementioned TV I get no red standby light at
all and the backlight flashes a little longer than a second. Any ideas?

Re: Dead Samsung UN55TU8000F

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Subject: Re: Dead Samsung UN55TU8000F
From: peterwie...@gmail.com (Peter W.)
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 by: Peter W. - Mon, 13 Nov 2023 19:45 UTC

On Monday, November 13, 2023 at 2:05:57 PM UTC-5, kgpup wrote:
> Hi all, when I plug in the aforementioned TV I get no red standby light at
> all and the backlight flashes a little longer than a second. Any ideas?

If I were to hazard a guess, that TV got spiked at some point. It may be as simple as a frozen relay in the starting circuit, a fusible link or similar.
Repeat: S.W.A.G. Guess.

Peter Wieck
Melrose Park, PA

Re: Dead Samsung UN55TU8000F

<3de93a33-afaa-4f46-a7d9-d83f2987adc5n@googlegroups.com>

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Subject: Re: Dead Samsung UN55TU8000F
From: ohge...@gmail.com (ohg...@gmail.com)
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 by: ohg...@gmail.com - Mon, 13 Nov 2023 21:34 UTC

On Monday, November 13, 2023 at 2:05:57 PM UTC-5, kgpup wrote:
> Hi all, when I plug in the aforementioned TV I get no red standby light at
> all and the backlight flashes a little longer than a second. Any ideas?

I've stopped taking in all TU series Samsungs because most have bad display screens. Symptoms are from random shutdown and restart (with tell-tale very fine horiz lines in the pic as viewed up close) to no picture, just constant rebooting on plug in.

If the TV cycles the back lights every 15-20 seconds or so by itself, it's probably a bad display. Unplug the ribbon to the display and see if the back lights stay on.

Re: Dead Samsung UN55TU8000F

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From: kgpupswi...@gmail.com (kgpup)
Subject: Re: Dead Samsung UN55TU8000F
Newsgroups: sci.electronics.repair
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 by: kgpup - Tue, 14 Nov 2023 14:42 UTC

On Mon, 13 Nov 2023 13:34:35 -0800, ohg...@gmail.com wrote:

> On Monday, November 13, 2023 at 2:05:57 PM UTC-5, kgpup wrote:
>> Hi all, when I plug in the aforementioned TV I get no red standby light
>> at all and the backlight flashes a little longer than a second. Any
>> ideas?
>
> I've stopped taking in all TU series Samsungs because most have bad
> display screens. Symptoms are from random shutdown and restart (with
> tell-tale very fine horiz lines in the pic as viewed up close) to no
> picture, just constant rebooting on plug in.
>
> If the TV cycles the back lights every 15-20 seconds or so by itself,
> it's probably a bad display. Unplug the ribbon to the display and see
> if the back lights stay on.

I unplugged the ribbons, same thing - backlight flash at 1 second
intervals.

Re: Dead Samsung UN55TU8000F

<a94b1a68-b584-41bb-9ff9-44e2df2e06cen@googlegroups.com>

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Subject: Re: Dead Samsung UN55TU8000F
From: ohge...@gmail.com (ohg...@gmail.com)
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 by: ohg...@gmail.com - Tue, 14 Nov 2023 15:55 UTC

On Tuesday, November 14, 2023 at 9:42:08 AM UTC-5, kgpup wrote:
> On Mon, 13 Nov 2023 13:34:35 -0800, ohg...@gmail.com wrote:
>
> > On Monday, November 13, 2023 at 2:05:57 PM UTC-5, kgpup wrote:
> >> Hi all, when I plug in the aforementioned TV I get no red standby light
> >> at all and the backlight flashes a little longer than a second. Any
> >> ideas?
> >
> > I've stopped taking in all TU series Samsungs because most have bad
> > display screens. Symptoms are from random shutdown and restart (with
> > tell-tale very fine horiz lines in the pic as viewed up close) to no
> > picture, just constant rebooting on plug in.
> >
> > If the TV cycles the back lights every 15-20 seconds or so by itself,
> > it's probably a bad display. Unplug the ribbon to the display and see
> > if the back lights stay on.
> I unplugged the ribbons, same thing - backlight flash at 1 second
> intervals.

Unplug the harness from the main board to the power supply and plug in the AC. If the backlights come on and stay on with the main disconnected, your main is probably bad.

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