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.
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).
The power supply (external or internal) may be oscillating; Change the external supply or look for dry capacitors in the internal one (if any).
Actually they are white. Flickering is currently faint but perceivable already.
Will switch to batteries first and see if it changes anything. Thanks for the suggestion.
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?
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.
Interesting. It was not necessary to disassemble and I doubt would have been possible. Don’t see screws so likely is glued together.
Yes, replace the electroytic capacitors; Usually there is one in the high voltage side and other in the low one, start with the latter.
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