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sci / sci.electronics.repair / Re: Digital clock with seven segments display flickering

SubjectAuthor
* Digital clock with seven segments display flickeringWu Ming
+* Re: Digital clock with seven segments display flickeringMiguel Gimenez
|+- Re: Digital clock with seven segments display flickeringWu Ming
|`* Re: Digital clock with seven segments display flickeringWu Ming
| `- Re: Digital clock with seven segments display flickeringMiguel Gimenez
`* Re: Digital clock with seven segments display flickeringRichard Jones
 `- Re: Digital clock with seven segments display flickeringWu Ming

1
Subject: Digital clock with seven segments display flickering
From: Wu Ming
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Wed, 11 Dec 2024 04:24 UTC
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: wu.ming2@icloud.com (Wu Ming)
Newsgroups: sci.electronics.repair
Subject: Digital clock with seven segments display flickering
Date: Wed, 11 Dec 2024 04:24:51 -0000 (UTC)
Organization: A noiseless patient Spider
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My no brand digital clock is beginning to flicker. Numbers are the
illuminated kind, 7 segments display and not LCD. Powered through USB
cable.

I have been using it for about five years. Most evenings I switched it to
the touch sensor so display is actually off for the night. Trying to extend
the display lifetime.

There’s anything I can do to fix it? Thanks for sharing.

Subject: Re: Digital clock with seven segments display flickering
From: Miguel Gimenez
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Wed, 11 Dec 2024 10:06 UTC
References: 1
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: me@privacy.net (Miguel Gimenez)
Newsgroups: sci.electronics.repair
Subject: Re: Digital clock with seven segments display flickering
Date: Wed, 11 Dec 2024 11:06:34 +0100
Organization: A noiseless patient Spider
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El 11/12/2024 a las 5:24, Wu Ming escribió:
> My no brand digital clock is beginning to flicker. Numbers are the
> illuminated kind, 7 segments display and not LCD. Powered through USB
> cable.
>
> I have been using it for about five years. Most evenings I switched it to
> the touch sensor so display is actually off for the night. Trying to extend
> the display lifetime.
>
> There’s anything I can do to fix it? Thanks for sharing.

A dying LED does not flicker, just looses brightness (white lighting
LEDs do blink, but that is a thermal problem with chinese crap).

The power supply (external or internal) may be oscillating; Change the
external supply or look for dry capacitors in the internal one (if any).

--
Saludos
Miguel Gimenez

Subject: Re: Digital clock with seven segments display flickering
From: Wu Ming
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Wed, 11 Dec 2024 11:22 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: wu.ming2@icloud.com (Wu Ming)
Newsgroups: sci.electronics.repair
Subject: Re: Digital clock with seven segments display flickering
Date: Wed, 11 Dec 2024 11:22:11 -0000 (UTC)
Organization: A noiseless patient Spider
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Miguel Gimenez <me@privacy.net> wrote:
> El 11/12/2024 a las 5:24, Wu Ming escribió:

>
> A dying LED does not flicker, just looses brightness (white lighting
> LEDs do blink, but that is a thermal problem with chinese crap).

Actually they are white. Flickering is currently faint but perceivable
already.

>
> The power supply (external or internal) may be oscillating; Change the
> external supply or look for dry capacitors in the internal one (if any).
>

Will switch to batteries first and see if it changes anything. Thanks for
the suggestion.

Subject: Re: Digital clock with seven segments display flickering
From: Richard Jones
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Wed, 11 Dec 2024 11:32 UTC
References: 1
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: news@rgjones.screaming.net (Richard Jones)
Newsgroups: sci.electronics.repair
Subject: Re: Digital clock with seven segments display flickering
Date: Wed, 11 Dec 2024 11:32:35 +0000
Organization: A noiseless patient Spider
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On 11/12/2024 04:24, Wu Ming wrote:
> My no brand digital clock is beginning to flicker. Numbers are the
> illuminated kind, 7 segments display and not LCD. Powered through USB
> cable.
>
> I have been using it for about five years. Most evenings I switched it to
> the touch sensor so display is actually off for the night. Trying to extend
> the display lifetime.
>
> There’s anything I can do to fix it? Thanks for sharing.

Could be a fault appearing in the mux circuitry. In most such displays
all the same position segments are connected together and each number
selected one at a time in turn. When done fast enough the human eye
doesn't notice the chasing.
Mind you that's probably all done within the main clock IC so not much
else to go wrong. Any chance of getting the clock open and posting the
main IC device number?

Subject: Re: Digital clock with seven segments display flickering
From: Wu Ming
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Fri, 13 Dec 2024 23:46 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: wu.ming2@icloud.com (Wu Ming)
Newsgroups: sci.electronics.repair
Subject: Re: Digital clock with seven segments display flickering
Date: Fri, 13 Dec 2024 23:46:34 -0000 (UTC)
Organization: A noiseless patient Spider
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Miguel Gimenez <me@privacy.net> wrote:
> The power supply (external or internal) may be oscillating; Change the
> external supply or look for dry capacitors in the internal one (if any).
>

It is the USB power supply oscillating. Switched from a HuntKey one, brand
I have never heard of and can not remember the bundle it came with, to an
Apple one and is now rock solid. I need the Apple supply though: it is
possible to fix the oscillating one? Thanks.

Subject: Re: Digital clock with seven segments display flickering
From: Wu Ming
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Fri, 13 Dec 2024 23:50 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: wu.ming2@icloud.com (Wu Ming)
Newsgroups: sci.electronics.repair
Subject: Re: Digital clock with seven segments display flickering
Date: Fri, 13 Dec 2024 23:50:08 -0000 (UTC)
Organization: A noiseless patient Spider
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Richard Jones <news@rgjones.screaming.net> wrote:
> Could be a fault appearing in the mux circuitry. In most such displays
> all the same position segments are connected together and each number
> selected one at a time in turn. When done fast enough the human eye
> doesn't notice the chasing.
> Mind you that's probably all done within the main clock IC so not much
> else to go wrong. Any chance of getting the clock open and posting the
> main IC device number?
>

Interesting. It was not necessary to disassemble and I doubt would have
been possible. Don’t see screws so likely is glued together.

Subject: Re: Digital clock with seven segments display flickering
From: Miguel Gimenez
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Mon, 16 Dec 2024 10:48 UTC
References: 1 2 3
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: me@privacy.net (Miguel Gimenez)
Newsgroups: sci.electronics.repair
Subject: Re: Digital clock with seven segments display flickering
Date: Mon, 16 Dec 2024 11:48:31 +0100
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El 14/12/2024 a las 0:46, Wu Ming escribió:
> Miguel Gimenez <me@privacy.net> wrote:
>> The power supply (external or internal) may be oscillating; Change the
>> external supply or look for dry capacitors in the internal one (if any).
>>
>
> It is the USB power supply oscillating. Switched from a HuntKey one, brand
> I have never heard of and can not remember the bundle it came with, to an
> Apple one and is now rock solid. I need the Apple supply though: it is
> possible to fix the oscillating one? Thanks.

Yes, replace the electroytic capacitors; Usually there is one in the
high voltage side and other in the low one, start with the latter.

--
Saludos
Miguel Gimenez

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