ATX PSU 5V STANDBY OK - ALL OTHER VOLTAGES TOO LOW LER
ฝัง
- เผยแพร่เมื่อ 5 ส.ค. 2021
- Learn Electronics Repair #106
Here we have an ATX PSU
The 5V Standby is OK but all the other voltages read much too low
So what is the problem here and can we fix it?
Wanna find out? You just gotta hit PLAY
Related videos:
PART 2 IS HERE
• ATX PSU All Output Vol...
ATX PSU Tester
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Thank you
Richard
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I really appreciate you took the time to check that power supply. I'll try to check mine based upon what you showed. Thanks.
The length of the video may discourage some people but it's really interesting, thank you
Hi John. These videos are basically what happens when I start a repair and try to explain my diagnostic approach to others. There is no rehearsal and I have absolutely no idea of what I am going to find, how long it will take me, or even if I can fix it or not.
I think that makes a fresh approach but maybe I should change the style and make more scripted/edited videos that fit into 30mins but then they are not showing the reality of electronics repair ,which is what I originally set out to do.
It seems there are different viewers with different viewing tastes - so for me it is a bit of a hard call to make.
Good to see you enjoyed it though ,despite the length. I'll try to make part 2 shorter - I have a couple of ideas what I can try next. And one of them is, well, quite interesting :D I still don't know if I will manage to fix it.
@@LearnElectronicsRepair Editing would take too much of your time at this stage; better leave it until you can get someone else to do it for you.
@@LearnElectronicsRepair Please keep things as they are. It's refreshing how real your videos are.
Are those blue caps tantalum? They like to short.
( see @19:05 ) The cream/brown material that's used to "glue" bigger components and wires to the board and reduce soft and flexible can become slightly conductive as it ages and goes from white/cream to a more brown color. It can cause problems, so I would use some isopropyl alcohol (or a few drops of gas lighter fluid if there's no IPA avaialable) to soften it and remove it especially from around the optocoupler, diodes and transformer. You can see some browning near R48 and the capacitor above it, but it could simply be due to excessive heat.
I would have checked some of the critical capacitors from the start (power for controller and 5v standby), desoldering one lead of capacitor is quicker than debugging everything.
Another simple step that often solves problems is checking for cracked solder joints
Yeah, i got to @1:19:25 ... both optocouplers have that gunk across the pins, so it wouldn't surprise me if that's become slightly conductive and acts like a high value resistance across the pins messing things up. May be worth cleaning that up and running the tests again, but who knows if operating in this mode has affected the internals or not...
Hi Mariushmedias. Thanks for the ideas. I do know about the white/cream glue when it goes dark it becomes conductive, and have mentioned that in other videos - it looks OK here but it is a good suggestion so I will remove it all anyway. Let's leave no stone un-turned here.
Your other suggestions I will try on part 2, plus check all the remaining capacitors.
If that doesn't work I'm gonna try breaking the feedback loop and see if I can force the output voltages to stabilise, then work back through the feedback circuitry if they do.
I also noticed another odd behaviour with this PSU - more on part 2.
yes your right it's horrible stuff, especially if it gets damp, I had a psu that kept blowing fuses for no reason, when I removed that gunk it was fine, obviously got damp and conductive and turned the main switching mosfet on.
In my amplifier the +5v is reading 11v this cant be right surely?
Would it be possible at some point in the future to do a video explaining passive vs active pfc please
Yeah OK why not
Yea..