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From: Richard Jones <news@rgjones.screaming.net>
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?