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 How to Check a Power Adapter (whether it's die)?

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Eventless
post Mar 23 2023, 05:44 PM

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QUOTE(mactreouser @ Mar 23 2023, 01:17 PM)
Wow... Appreciate your helpful information! 🤩
It was working perfectly in the pass 2 weeks. And just go south yesterday 😭

I did test the 24v output via multimeter, either no value or not a stable value. So I tried on my 5v charger , it's stable at 5v+-. That means multimeter is good.

You are E&E Expert! I saw an info mentioned about that this kind of power adapter mostly caused by Rectifier! But I don't really have no knowledge about that , in fact I wish to learn 🤩 Do you kind to lead me?
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If the power adapter is not producing the correct voltage, it is broken already. Your only option to replace it. Messing around with the components that are connected to 240v is dangerous especially when you don't know what you are doing.
Eventless
post Mar 23 2023, 06:02 PM

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QUOTE(blindmutedeaf @ Mar 23 2023, 11:15 AM)
AC is ok, they don't quite care.

So after measuring at the output, doesn't have 24Vdc?
just happen lately or since day1?

For AC --> DC converter normally rectifier gg
this is the typical sch (ignore the values) https://www.circuits-diy.com/wp-content/upl...m-Schematic.png

user posted image
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That kind of power supply design isn't used much these days. They are big, heavy and inefficient.

Nearly all of the power supply these days are switch mode power supplies which are much more complicated than the design above. Some can accept a wide input voltage range(100-240v) like the one shown in the picture on the first post.
https://en.wikipedia.org/wiki/Switched-mode_power_supply
Eventless
post Mar 24 2023, 05:57 PM

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QUOTE(blindmutedeaf @ Mar 24 2023, 03:43 PM)
if you look at the initial thread, you will find a transformer there and i suspect the one IC beside the heatsink is the rectifier but without proper image, i cannot confirm
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Transformers and diodes can also be found in a switch mode power supply.

The first picture in this thread shows that the power supply can take an input volltage of 100v to 240v. Assuming your circuit was using a 240v to 24v tranformer, it would only produce around 10V if it was fed 100v. Way too low to produce 24v DC.
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