Help! My PC was in standby and it suddenly went BANG. Can We Fix It? How To Repair ATX PSU.
Вставка
- Опубліковано 1 січ 2024
- My PC was sitting there in standby when the ATX Power Supply suddenly went BANG. After this the PC would not power on. So can we fix it? Let's have a look
I work in collaboration with:
The Electronics Channel (with Carlos and Detlef)
/ @theelectronicschannel
Gran Canaria Uncovered
/ @grancanariauncovered (with Detlef and Julie. Not electronics related)
Det Builds Stuff - / @detbuildsstuff (Detlef)
Retro Upgrade - / @retroupgrade (Carlos)
For All Your PCB needs: free $5 discount coupon
www.pcbway.com/setinvite.aspx...
Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.
TEST METERS
Aneng AN8009
s.click.aliexpress.com/e/_DdW...
amzn.to/469ZgOS
www.banggood.com/custlink/mD3...
KM601
s.click.aliexpress.com/e/_DBw...
www.banggood.com/custlink/KD3...
VC480C+
s.click.aliexpress.com/e/_DEY...
amzn.to/3Q3LEz7
amzn.to/46tmNdo
MESR-100 ESR METER
amzn.to/3tiy8hK
amzn.to/3RwvejK
s.click.aliexpress.com/e/_Dmi...
XC6013L CAPACITOR METER
s.click.aliexpress.com/e/_DmX...
amzn.to/3t71Nul
amzn.to/3LDdcbO
TM-902C TEMPERATURE METER
s.click.aliexpress.com/e/_Dm9...
amzn.to/3LFzERv
amzn.to/3PTwuvW
LCR-T4 LOW COST COMPONENT ANALYZER
s.click.aliexpress.com/e/_Dmq...
www.banggood.com/custlink/KKK...
amzn.to/46uzV1R
amzn.to/3RHsmAN
FNB58 USB ANALYZER
s.click.aliexpress.com/e/_Dmd...
amzn.to/3tb1QW8
amzn.to/46oMn30
www.banggood.com/custlink/mKm...
PCI POST ANALYZER
s.click.aliexpress.com/e/_DBs...
amzn.to/46m9Gep
TL460S Plus PCI_E ANALYZER
s.click.aliexpress.com/e/_DnB...
amzn.to/3ZERvOs
TOOLTOP ET829 SCOPE METER
s.click.aliexpress.com/e/_DBw...
www.banggood.com/custlink/KGv...
MULTIMETER PROBE KIT KET05
s.click.aliexpress.com/e/_DE7...
OSCILLOSCOPES
FNIRSI 1014D
s.click.aliexpress.com/e/_DEz...
amzn.to/3RxMFk1
www.banggood.com/custlink/KKG...
FNIRSI DSO-TC3
s.click.aliexpress.com/e/_DC8...
amzn.to/3RBsgdS
www.banggood.com/custlink/Gm3...
FNIRSI DPOX180H
s.click.aliexpress.com/e/_DBX...
amzn.to/468oooT
www.banggood.com/custlink/GGG...
BENCH PSU
NPS3010W
s.click.aliexpress.com/e/_DDP...
amzn.to/3rxsuIf
www.banggood.com/custlink/3DD...
SOLDERING
T12 Station with M8 9501 Handle
s.click.aliexpress.com/e/_DFV...
amzn.to/3FdG8Ul
M8 9501 HANDLE
s.click.aliexpress.com/e/_De0...
T12-BC3 Tip
s.click.aliexpress.com/e/_DeN...
amzn.to/3EUFpqQ
amzn.to/3PB8axw
SUGON T26D
s.click.aliexpress.com/e/_DFx...
QUICK 861DW
s.click.aliexpress.com/e/_DDo...
amzn.to/3PBOKZH
amzn.to/3RCSqNh
PROS'KIT SS-331H
s.click.aliexpress.com/e/_DDo...
SS-331H Spare Parts
www.aliexpress.com/item/40002...
THERMAL CAMERA
Infiray P2 Pro
s.click.aliexpress.com/e/_Dmu...
amzn.to/457PgEb
www.banggood.com/custlink/DDG...
MICROSCOPES
Amscope Optical Microscope (copy)
s.click.aliexpress.com/e/_Dlh...
uk.banggood.com/custlink/mKGy...
amzn.to/4675Qp0
amzn.to/459uvrY
ANDONSTAR AD407
s.click.aliexpress.com/e/_Dl4...
amzn.to/3PSQKxJ
amzn.to/48sxej4
EEPROM Programming
TL866 II+
s.click.aliexpress.com/e/_Dls...
amzn.to/3RTCRB9
amzn.to/3LDu3Lu
CH341A
s.click.aliexpress.com/e/_Dk0...
amzn.to/48IZiir
1.8V ADAPTER
s.click.aliexpress.com/e/_Dci...
CONSUMABLES
NC-559-ASM FLUX
s.click.aliexpress.com/e/_Dda...
DESOLDER BRAID (I use size 8045)
s.click.aliexpress.com/e/_Dl5...
s.click.aliexpress.com/e/_DFJ...
MECHANIC HX-T100 Solder 63:37 (I use 0.6mm)
s.click.aliexpress.com/e/_DeZ...
ESD-11 TWEEZERS
s.click.aliexpress.com/e/_DCZ...
amzn.to/3PVfO7e
Learn Electronics Repair is now on Discord! Come and join the fun, it's free.
/ discord
If you would like to support this channel
You can send donations
www.paypal.com/paypalme/youtu...
You can subscribe to Patreon
/ learnelectronicsrepair
Or you can click Join to become a channel member
Thank you
Richard
The windings on the choke just to the right of the failed diode look a bit odd - shifted out away from the core on the right side. Great video as always. Regards, David
seconding this, it looks damaged
Agreed.... 👍
Heya, this is the sort of video I like the most hands on and clearly explant by a bad pws and drowing on papier. and I saw part 2 came out 40 minutes ago so lets see what's wrong further.
Happy new year Richard :) Nice walkthrough of troubleshooting the atx board 🥰
Nice video ! Happy new year ! I'm waiting for the part 2 :D
Great vid. Looking forward to part 2.
Happy New Year ! As always, most illuminating .
you explained it very professional - thank you Leta see, if you can fix it - very interesting . There are perhaps a few other canals out there , but you explain properly and slowly, so that I can understand, what you are doing - thats fine
Like a mosquito zapper 😂❤🎉 happy new year It seems you had your own Fireworks show 😂😂
Great instructional video. From my experience of working on PSU's I would not have used a lamp dimmer on a unit with PFC, I have done more damage than good so now I just use a variac with an ammeter. I see you checked the SMPSU switching mosfets for shorts and as you say had they gone it should have blown the fuse, but I didn't see you check the standby mosfet and some PSU's use a TOP222 or similar, these would have a low-value resistor in the source for current sense, in your case this probably would have blown rather than the fuse hence the "pop". Looking forward to seeing part 2
I think it would be good practice Richard to replace all the capacitors in the 5v supply as standard practice once you have found the shorter component. These capacitors as you know are always running.
This sounds good. What temperatures do they see sitting there? I think the fans are off in standby, maybe running the fan at low speed on standby could reduce temperature and increase life.
Check the high voltage caps (blue one) between primary and secondary. It may be look good on one side and completely blown up on the other.
If you have a chance would you mind explaining how the light bulb on mains is used in the service of diagnostics? Thank in advance and thank you for your informative videos. I enjoy watching how you diagnose and trouble shoot electronics problems and fixes.
Try going back into the previous vids and watching the vid Richard made on that very subject....
Richard actually shows you how to build one and explains in detail how they work! Like all his other videos, it's GREAT!
Check the 'old glue' too. Some of that stuff will go from white to yellow to brown and then start conducting. Especially bad around high voltage capacitors where it is commonly used.
wow really? that silicone glue may start to conduct at some point in its life?
@@SirasPK Yup. Seen it happen on my own UPS. Fortunately I caught it before there was damage. Others weren't so lucky. Ticking timebomb. There's videos on UA-cam.
@@SirasPK No, silicone is fine. This yellow glue here is some other, cheaper junk. It goes conductive over time (possibly due to absorbing moisture from the air) and can cause electrical leakage, it also loves creating corrosion on anything it touches.
I had the same problem on an xbox 360 PSU, short on 5V STB and I had a short on the same diode, removed it and the short was gone so got another diode from a donor board and it works fine now.
I suspect the optoisolator. If it is shorted on the photodiode side it would explain why the PFC is running.
A couple of questions 1) Whats driving the standby transformer? Is it the 8 pin ic that's visible at 7.17 above the controller ic? If it is, it might be worth it tracking down where it is getting it's Vcc from since if it is not starting up then it won't drive the standby transformer and hence no standby 5v.
2) Are we sure the pfc is running since we saw 270v and not the 385v that should have been present? Doesn't the pfc kick in only when the motherboard sends an all good signal back to the power supply?
3) The controller chip that drives the main transformer is an a7500c. It needs to see 15v Vcc on pin 12. You can check to see if the 15v is present which should tell you if the standby transformer is kicking in at all since as you yourself stated, it is probably providing the 15v for the controller as well as the 5v standby.
I suspect he was only getting 270v on the caps because of the current limiter bulb flickering, the voltage never had a chance to rise properly, one of the reasons I never use a lamp dimmer with PFC PSU's, does more damage than good.
Electronics before Christmas are most likely to get in troubles....tvs pcs...etc
How can the PFC board know if the power supply is in standby or not? I don't get it. There is no feedback to that board from the secondary side.
Stand by transformer does that pop too sometime it is snapping inside. At once that 5v stby diod made jump to schottky diod's aluminum cooler also popped and cooked diod of 12v rail one of high voltage transistors and fuse was still good. Another 400 w one was connected to the system which is using arround 300 350 w also popped after 30 min high side transistors was gone lil zener diod was gone 12v rail diods was gone and all breakers in the house was down and i couldnt turn them on till i unplug power sup and guess what fuse was good in it. So i have zero trust to those fuses...
I had a 7809 blow up very loud no smell It was the emitter leg?
Sorry? Emitter leg? On a 7809? Far as I know it's not a transistor but a 9 Volt positive linear regulator, which means an IC. In, Ground or Common and Out.....
I was just pointing out the similarity of symptom. @@GapRecordingsNamibia
Hey thanks for making these videos! Anyway you could help me? i need x570 motherboard repair. i think its the power regulator mpt chip like in your x570 motherboard repair video. but not exactly sure. i did not see an email how could i get in touch?
I will say MOSFET or Diode
For any children watching make sure that you leave it unplugged For a decent amount of time and Don't touch any High voltage capacitors Unless you have discharged them 1st or 💥☠️😵🤯
Yes, children do have a habit of watching 40 minute long SMPS repair videos.
@@incandescentwithrage children have a habit of watching a repair video and thinking it's fine to prod and poke around so it was a good call - for those who do know about the dangers already, there is no harm in being told twice and for those who might not give a thought about capacitors holding a charge, it's important information.
@@incandescentwithrage 😂🤣😂🤣
@@budgetmerch I'm sure he was just taking the piss......... Anyway, a child will only do that once, the "poke" area is very small, and the burn value very big as long as the DUT is not powered (plugged in) they will get a damned good wallop and not die (I hope).... but, the lesson will be learned, and the scar will be there as a very good reminder for a few days........ Other than that, it'll either discourage or encourage as in my case...... 😂🤣
Well the diode was short, so ac was applied to the DC electrolytics, maybe not for long enough, but you should as good practice replace them both too. If the caps are damaged, they also may have damaged the new diode?
Wonder if this comment will also get shadow banned?
It's still there at the moment 😊
What's that "!!!" $hit in the thumbnails recently?😠
Oh no a Xilence. This things are garbage from Factory.
It's a common mistake for random non-technical people to leave everything on standby. You should know better. I always unplug everything when not in use. I have a lot of old retro stuff here from the 80's and 90's that I rarely use. Most of it (when on) is potentially a fire hazard so it's always best to leave stuff not plugged into mains when not in use. When a modern SMPS goes bang it usually takes out a bunch of parts and modern PSUs are loaded with hundreds of smd parts. There doesn't appear to be any smd parts on that PSU so it's an old one. It might not even be worth fixing since it's old cheap chinese rubbish and they can be replaced easily with a new one. The primary reason to fix something is because it can't be bought new or replaced easily. In any case, if you do fix it be sure you find and replace all the bad parts otherwise it'll go bang again hehe! At the very least you must find the blown up part... which you did not do. You'll need to remove large amounts of stuff to get into the bowels of that psu. For something like that it's generally cheaper to just toss it and buy another one. Power supplies are cheap now and unless you are bored, have loads of time and want to learn it's not worth fixing it. Of course it will make a good YT vid if you can fix it, but a vid without a fix isn't going to be much use as a learning tool since you're explaining stuff but not finding the actual fault... meaning you're skipping over something that is important because you didn't find it. The amount of info that can be taken from a no-fix vid is limited to the troubleshooting process. That's a thing but you still end up with a disappointing no fix and missing info ;-)
Ouch...... I always switch off all my stuff in my work area via a DPS Just my nature. Was banged into me from a very young age, I mean tv chargers etc, are all still plugged in, but, the area that has all my bench and test equipment on it is powered down fully when I leave the area just to stop any .......... Mistakes......... Form occurring.......
to be honest it is not worth the efford to repair that psu looks like a cheap crappy made psu anyway .... better of with a different psu