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From: Miguel Gimenez <me@privacy.net>
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