You will find the ATX PSU Hall Of Shame here ua-cam.com/video/UyS9rCtgoXQ/v-deo.html 16 Faulty ATX Power Supplies. Take a look and vote for any that you would like to see repaired next.
As an electronics repair engineer myself and specialising in bespoke PSU repair, particularly within the flight simulation/pilot training industry, I find your videos very informative, as there are some things one forgets over the years. I must admit I don't used a bulb limiter, the one time I did it blew the PFC in a rather expensive rare PSU and I vowed never to use one again. I do however use a variable transformer(variac clone) with an ammeter, I also have the privilege of owning a Huntron tracker where I can place the test leads across the main input or bridge rec and see the charge waveform, if it looks like a diode or semiconductor then there is a problem within the primary circuit, the method still works if PFC or soft start is incorporated within the PSU. Keep up the good work.
I'm thinking of doing this. I would definitely replace the varistor(s) too, as they often wear out quicker than the caps, as every spike they absorb wears them out a bit.
Excellent instructional video,very glad indeed that these repair skills have Not died out. This is one good advantage of the internet,where you can provide others with your experience and knowledge. Is there one of these atx power supply units which is dead due to blown glass fuse. I would like to learn more on why this might have occurred and what to check is likely the probable cause of this. Also thank you for highlighting the safe working procedures,when handling these power units.
The capacitors that you labeled 7,8,9 look to be in an area where the legs are buried somewhere in a big patch of solder. How do you remove those, and how do you reinstall them? 21:38 in the upper right hand corner. I notice that the patches of soldier are separated by very narrow channels, so it looks like if you got solder in the channels it would be hard to fix. Unless those patches are made from a metal with a higher melting point?
Hey! I have a 2007 Coolermaster 1000w PSU that I recently cleaned out and noticed a couple of dying caps in there. Do you repair user power supplies? I’m from the UK. Such a shame to throw this power supply away as it’s proper retro and a really nice unit for my older builds.
Hi there, one of my pending jobs at home is to take one of those good PC power supply from the year 2003 that had many amps in the 5v line and completely replace ALL capacitors, but not replacing the 2 biggest ones i think they are called main. Because capacitors during that era were a mess and most of them bulge, happens on all motherboards too. One question i have is regarding the risk of getting an electric shock. Suppose the power supply is kept in storage with its box, how many days do you have to wait for the main capacitors to be completely free of charge in order to avoid getting an electric shock?
Hi just come across your channel...I've had to order a new pc PSU...this morning the pc wouldn't turn on, it was in stand by... I check the 240 socket at the back of the pc and neutral pin had melted to the plastic plug...any ideas why this would happen.. Thanks
Just found your channel and subscribed immediately. Great stuff. I'm no expert but have repaired a handful of cheapo Chinese power supplies (transistors, diodes etc.) but a couple of days ago salveged an ATX 2 supply from an old PC and made a bench power supply with it. I stumbled across your channel. While looking for ATX info, and very interesting indeed. Everything I read mentioned having to load a rail for stable output and as I wasn't getting any super reliable results as the which to load I ended up with a 6.8ohm 50W power resistor on both the 5V and 3.3V rail. Seems to work fine, but just wondering if you have any thoughts on this. Without any load I was getting about a 0.3V fluctuation. With the loads I have less than 0.1V so I guess loading both rails isn't a bad thing. Anyway, keep up the good work. I've already learned a few things and much more to learn yet I'm sure. FYI, I'm a Brit watching your channel from my home in Thailand. Happy New Year. Cheers Matt.
Hi Matt welcome to the channel A lot of ATX PSU only monitor the 3.3V and use that to regulate all the others. You can usually tell if there are two wires going to one of the pins in the ATX 20/24 pin connector, tha tis the monitored voltage rail. If you have no load on the 3.3V then the output capacitors charge up to 3.3V and can't discharge. So if for example you draw power from the 12V but not the 3.3V the PSU does not realise the 12V is dropping and it can't regulate properly. Normally putting a load on 3.3V prevents the problem. I show this on some of my later videos. LER also has a discord server. Learn Electronics Repair is now on Discord! Come and join the fun and let's fix stuff together, it's free. discord.gg/vam6YC8vwU Thailand is one of my favourite places, if I wasn't living in the Canary Islands I may well consider living there. I was in Patong Beach some years ago, and of course the infamous Bangla Road provided many distractions 🙃
Not that long... I have seen large capacitors in power amplifiers hold a powerful charge for several days, if the load is disconnected. The safest thing is always to measure the voltage across large (especially high voltage) capacitors before you work on an item. Not only for personal safety but to prevent damage to your test equipment, or to prevent erroneous resistance readings etc thet may cause you to misdiagnose a fault and waste your time and effort.
Hi, mostly I just had a good electronics repair knowledge to start with. I only started fixing motherboards and GPU about two years ago. A good way to learn GPU repair is get some faulty ones yourself to 'play' with, and go to badcaps forum - the guys in the Motherboard and GPU repair section will help you. That's where I leaned most of the GPU specific stuff. www.badcaps.net/forum/index.php
You might damage the test meter if a capacitor has a charge. Is it normal for the primary capacitor to be connected between two heatsinks, and have failed without visible damage?
It's really cool to see you fix so many things, educational, but really, where today would you use an old 300 watt psu, that's cheaply built as you say. When the apocalypse comes, your skills will be greatly needed. Good show. Carry on, try to stay alive till then... Just sayin 'Mike
I have a question about two smoothing capacitors. it's ok if replace with a higher value capacitance for exp. original is 200V 560uF and instead, you put 820uF 200V? what is your opinion about that?
My computer suddenly just shut off I have power going to the motherboard the button on the motherboard lights up red And other devices plugged in have power lights come on But as soon as I pushed the power button the blue light on the front of the tower switches on an immediately Dims and goes off I have to turn the power supply off and back on then the board does exactly the same thing over and over I tested with a paper clip In the green and black wire and the fan did not work But if I test the connector That plugs into the mother board I get readings on multimeter I haven't compared them to a chart to see if thay are correct yet Looks like I might have found the right video Maybe
Hi, I have a gtx 970( inno 3d), when I connect it to my pc and I try to power on, the psu cut the power ( security mode). So I have a short on the gpu ( I have test with another pc. I try to learn to detect the problem but I can't find it exactly. I have test with continuity mode the vrm and I find 1 of the 12 mosfet have a short. So with my hot air gun I have removed this faulty mosfet and I try to use the gpu like this, to test it. And the pc power on! So I try furmark ( stress test gpu) but the screen has turned black ( no signal). I restart the pc and it's works again but I try with a game 1 min and no signal. So with high intensity utilisation the gpu doesn't have enough power I think and it turn of. (fans spin when no signal). I have bought similar mosfet ( 5) and I try to solder it ( I think my solder is enough good to work and have good contacts) but the gpu have a short again, As at the beginning. So I think the problem is not the mosfet the problem but Something else not far away. Can you help me?
Hi ZeBENCH That's quite an involved question. I'd suggest you join the free forum at www.badcaps.net/forum/ Once you registered post the above question plus some pics of your board in the motherboard and GPU repair section www.badcaps.net/forum/forumdisplay.php?f=14 It's easier there for myself and others to look at your pics and tell you what you need to check next. Running the GPU with VRM Mosfets missing is not generally a good idea. I'm also very surprised you can find a short circuit Mosfet (if it is on a multiphase VRM such as GPU Vcore) in continuity mode - as normally you would see short circuits everywhere even with only one Mosfet shorted. If you could also show (on the pics) where you are measuring the short that would help I hope to see you there, and can help more. Post back here once you registered if you like, and I will take a look for you.
you are being penalised by youtube for putting so much dominating text in your thumbnails. I suggest putting each thumbnail with a picture of you and your repair bench and minimal text.
@@LearnElectronicsRepair I’m an insider. But from your point of view just look at similar channels with similar amount of content on the same subject. Great content by the way.
@@laptoprepairglasgow I have tried to make comparisons but I can’t find any other similar channels of a similar age (4 month and 9 days as of today 2nd Aug 2021) this Channel opened March 24th I do know that LER subscribers are increasing exponentially (or better) month on month Month 1 24 subscribers Month 2 58 Subscribers - increase of 34 = 141.6% gain Month 3 114 Subscribers - increase of 56 = 96.5% gain Month 4 260 Subscribers - increase of 146 = 128% gain Month 5 (first nine days) 386 Subscriber - increase of 126 = 48.5% gain in 9 days For the first 2 months none of the videos had thumbnails at all. I added them all early in June. The earlier videos have much more tame thumbnails but channel growth increased since I started to use them and increased more when i started to use the bolder ones. When I added drop shadows to the text the growth rate increased again. I have no idea how closely channel growth is related to thumbnails (a lot of YT experts say it is very dependant) so I can only say what I noticed from my own observations Good to hear you like the channel content :-D I enjoy making it.
@@LearnElectronicsRepair markieyoung.medium.com/this-is-why-your-youtube-thumbnails-suck-4479149621d4 Your doing great. Its only a suggestion. You'll grow either way.
You will find the ATX PSU Hall Of Shame here
ua-cam.com/video/UyS9rCtgoXQ/v-deo.html
16 Faulty ATX Power Supplies. Take a look and vote for any that you would like to see repaired next.
As an electronics repair engineer myself and specialising in bespoke PSU repair, particularly within the flight simulation/pilot training industry, I find your videos very informative, as there are some things one forgets over the years. I must admit I don't used a bulb limiter, the one time I did it blew the PFC in a rather expensive rare PSU and I vowed never to use one again. I do however use a variable transformer(variac clone) with an ammeter, I also have the privilege of owning a Huntron tracker where I can place the test leads across the main input or bridge rec and see the charge waveform, if it looks like a diode or semiconductor then there is a problem within the primary circuit, the method still works if PFC or soft start is incorporated within the PSU. Keep up the good work.
25:00 so, Jun Fu, CapXion, and Jee. Fabulous. I am redoing a computer PSU and replacing with all Panasonic Polymer.
I'm thinking of doing this. I would definitely replace the varistor(s) too, as they often wear out quicker than the caps, as every spike they absorb wears them out a bit.
Excellent instructional video,very glad indeed that these repair skills have Not died out.
This is one good advantage of the internet,where you can provide others with your experience and knowledge.
Is there one of these atx power supply units which is dead due to blown glass fuse.
I would like to learn more on why this might have occurred and what to check is likely the probable cause of this.
Also thank you for highlighting the safe working procedures,when handling these power units.
In a much older power supply (1990), would you also (proactively) replace other capacitors (the 2 big ones on the AC side + the protective film ones)?
The capacitors that you labeled 7,8,9 look to be in an area where the legs are buried somewhere in a big patch of solder. How do you remove those, and how do you reinstall them? 21:38 in the upper right hand corner. I notice that the patches of soldier are separated by very narrow channels, so it looks like if you got solder in the channels it would be hard to fix. Unless those patches are made from a metal with a higher melting point?
Hey! I have a 2007 Coolermaster 1000w PSU that I recently cleaned out and noticed a couple of dying caps in there. Do you repair user power supplies? I’m from the UK. Such a shame to throw this power supply away as it’s proper retro and a really nice unit for my older builds.
Hi there, one of my pending jobs at home is to take one of those good PC power supply from the year 2003 that had many amps in the 5v line and completely replace ALL capacitors, but not replacing the 2 biggest ones i think they are called main. Because capacitors during that era were a mess and most of them bulge, happens on all motherboards too. One question i have is regarding the risk of getting an electric shock. Suppose the power supply is kept in storage with its box, how many days do you have to wait for the main capacitors to be completely free of charge in order to avoid getting an electric shock?
Awesome job. Thank You.
Thank you too!
Very good video, thank you
Thank you too!
Hi just come across your channel...I've had to order a new pc PSU...this morning the pc wouldn't turn on, it was in stand by... I check the 240 socket at the back of the pc and neutral pin had melted to the plastic plug...any ideas why this would happen..
Thanks
Just found your channel and subscribed immediately. Great stuff.
I'm no expert but have repaired a handful of cheapo Chinese power supplies (transistors, diodes etc.) but a couple of days ago salveged an ATX 2 supply from an old PC and made a bench power supply with it. I stumbled across your channel. While looking for ATX info, and very interesting indeed.
Everything I read mentioned having to load a rail for stable output and as I wasn't getting any super reliable results as the which to load I ended up with a 6.8ohm 50W power resistor on both the 5V and 3.3V rail. Seems to work fine, but just wondering if you have any thoughts on this. Without any load I was getting about a 0.3V fluctuation. With the loads I have less than 0.1V so I guess loading both rails isn't a bad thing.
Anyway, keep up the good work. I've already learned a few things and much more to learn yet I'm sure.
FYI, I'm a Brit watching your channel from my home in Thailand.
Happy New Year.
Cheers
Matt.
Hi Matt welcome to the channel
A lot of ATX PSU only monitor the 3.3V and use that to regulate all the others. You can usually tell if there are two wires going to one of the pins in the ATX 20/24 pin connector, tha tis the monitored voltage rail. If you have no load on the 3.3V then the output capacitors charge up to 3.3V and can't discharge. So if for example you draw power from the 12V but not the 3.3V the PSU does not realise the 12V is dropping and it can't regulate properly. Normally putting a load on 3.3V prevents the problem. I show this on some of my later videos.
LER also has a discord server.
Learn Electronics Repair is now on Discord! Come and join the fun and let's fix stuff together, it's free.
discord.gg/vam6YC8vwU
Thailand is one of my favourite places, if I wasn't living in the Canary Islands I may well consider living there. I was in Patong Beach some years ago, and of course the infamous Bangla Road provided many distractions 🙃
So how long can they hold power can I say mine is safe been unplugged for about 3 to 4 months
Not that long... I have seen large capacitors in power amplifiers hold a powerful charge for several days, if the load is disconnected. The safest thing is always to measure the voltage across large (especially high voltage) capacitors before you work on an item. Not only for personal safety but to prevent damage to your test equipment, or to prevent erroneous resistance readings etc thet may cause you to misdiagnose a fault and waste your time and effort.
Greetings from mexico, i like your GPU repairing videos, Where did you get all that knowledge? Great job!!
Hi, mostly I just had a good electronics repair knowledge to start with. I only started fixing motherboards and GPU about two years ago. A good way to learn GPU repair is get some faulty ones yourself to 'play' with, and go to badcaps forum - the guys in the Motherboard and GPU repair section will help you. That's where I leaned most of the GPU specific stuff.
www.badcaps.net/forum/index.php
You might damage the test meter if a capacitor has a charge. Is it normal for the primary capacitor to be connected between two heatsinks, and have failed without visible damage?
If the cap is super old, the electrolyte will have expired and gone back, meaning it looks fine despite lack of visible damage
Thank you sir.
You're welcome
It's really cool to see you fix so many things, educational, but really, where today would you use an old 300 watt psu, that's cheaply built as you say. When the apocalypse comes, your skills will be greatly needed. Good show. Carry on, try to stay alive till then... Just sayin 'Mike
I have a question about two smoothing capacitors. it's ok if replace with a higher value capacitance for exp. original is 200V 560uF and instead, you put 820uF 200V? what is your opinion about that?
Some question on my mind but my caps is and of the line near the out cables. 1500uf 16v and i only have 2200uf 16v🤔
I also have this kind of PSU sitting in storage for years, today I open it and find that some capacitor is bulging
JUN FU capacitors laugh out loud. I once had some capacitors named Wang. so that's what I did, I Wanged them in to the bin :-)
Voltages ok, but 5v supply has 200mv ripple > 50 mv tolerance. Computer random restart about every 2 weeks. Time to recap, it seems.
My computer suddenly just shut off I have power going to the motherboard the button on the motherboard lights up red And other devices plugged in have power lights come on But as soon as I pushed the power button the blue light on the front of the tower switches on an immediately Dims and goes off I have to turn the power supply off and back on then the board does exactly the same thing over and over I tested with a paper clip In the green and black wire and the fan did not work But if I test the connector That plugs into the mother board I get readings on multimeter I haven't compared them to a chart to see if thay are correct yet Looks like I might have found the right video Maybe
Hi,
I have a gtx 970( inno 3d), when I connect it to my pc and I try to power on, the psu cut the power ( security mode). So I have a short on the gpu ( I have test with another pc. I try to learn to detect the problem but I can't find it exactly. I have test with continuity mode the vrm and I find 1 of the 12 mosfet have a short. So with my hot air gun I have removed this faulty mosfet and I try to use the gpu like this, to test it. And the pc power on! So I try furmark ( stress test gpu) but the screen has turned black ( no signal). I restart the pc and it's works again but I try with a game 1 min and no signal. So with high intensity utilisation the gpu doesn't have enough power I think and it turn of. (fans spin when no signal). I have bought similar mosfet ( 5) and I try to solder it ( I think my solder is enough good to work and have good contacts) but the gpu have a short again, As at the beginning. So I think the problem is not the mosfet the problem but Something else not far away. Can you help me?
Hi ZeBENCH
That's quite an involved question. I'd suggest you join the free forum at www.badcaps.net/forum/
Once you registered post the above question plus some pics of your board in the motherboard and GPU repair section
www.badcaps.net/forum/forumdisplay.php?f=14
It's easier there for myself and others to look at your pics and tell you what you need to check next.
Running the GPU with VRM Mosfets missing is not generally a good idea. I'm also very surprised you can find a short circuit Mosfet (if it is on a multiphase VRM such as GPU Vcore) in continuity mode - as normally you would see short circuits everywhere even with only one Mosfet shorted.
If you could also show (on the pics) where you are measuring the short that would help
I hope to see you there, and can help more. Post back here once you registered if you like, and I will take a look for you.
you are being penalised by youtube for putting so much dominating text in your thumbnails. I suggest putting each thumbnail with a picture of you and your repair bench and minimal text.
What makes you think I am being penalised by UA-cam?
@@LearnElectronicsRepair I’m an insider. But from your point of view just look at similar channels with similar amount of content on the same subject. Great content by the way.
@@laptoprepairglasgow
I have tried to make comparisons but I can’t find any other similar channels of a similar age (4 month and 9 days as of today 2nd Aug 2021) this Channel opened March 24th
I do know that LER subscribers are increasing exponentially (or better) month on month
Month 1
24 subscribers
Month 2
58 Subscribers - increase of 34 = 141.6% gain
Month 3
114 Subscribers - increase of 56 = 96.5% gain
Month 4
260 Subscribers - increase of 146 = 128% gain
Month 5 (first nine days)
386 Subscriber - increase of 126 = 48.5% gain in 9 days
For the first 2 months none of the videos had thumbnails at all. I added them all early in June. The earlier videos have much more tame thumbnails but channel growth increased since I started to use them and increased more when i started to use the bolder ones. When I added drop shadows to the text the growth rate increased again.
I have no idea how closely channel growth is related to thumbnails (a lot of YT experts say it is very dependant) so I can only say what I noticed from my own observations
Good to hear you like the channel content :-D I enjoy making it.
@@LearnElectronicsRepair markieyoung.medium.com/this-is-why-your-youtube-thumbnails-suck-4479149621d4 Your doing great. Its only a suggestion. You'll grow either way.