ATX PC power supply diagnostic and repair.
Вставка
- Опубліковано 11 чер 2024
- Here in this video I am going to test, diagnose and repair ATX power supply for one desktop PC. The PC went dead after power supply failure. Here we will learn how to test and limit the power supply fault to a particular circuit.
replacement power supply can be found anywhere in the market. switching power supply is the main part of today's modern electronic equipment. power supply manufacturers are everywhere in China. 12 volt computer power supply is very common ATX type supply used in computers, laptops, photocopiers, printers, atox and everywhere. unregulated power supply is another common type of power supply used in most equipment. 24vdc power supply is sometimes used to charge a lead acid battery. pc 12v power supply can be modified as lab power supply. 12v dc atx power supply is common type supply for desktop PC. pulse power supply is another name give to a switching power supply. ac dc power supply is very common for lab use. linear regulated power supply are used as variable voltage output supplies. programmable power supply is another kind of variable voltage power supply. cosel power supply is sometimes used in electronics. best power supplier are most manufacturers. industrial power supply is another kind of power supply used. 12v dc computer power supply can be used as apx power supply. where can i buy a power supply is common question asked. medical power supply is the most costly type of power supply used in medical equipment. switching power supply is another name of ATX power supply. dc power supply is also a kind of switching regulator. ups power supply is termed as uninterruptible power supply. 12v power supply has many many uses.
This is the first power supply video I've seen that wasn't just a capacitor or fuse and one of the few videos that actually takes the time to troubleshoot the device. It is very good when people making videos put in quality effort & educate people who are interested in electronics
Thanks friend. That is the purpose of the video.
G+ Link: https: ua-cam.com/channels/Jb9vF4EHIF_RWyDWrLQT-A.html
Nice Video! Apologies for butting in, I am interested in your initial thoughts. Have you heard about - Saankramer Electronic Magazine System (google it)? It is an awesome one off guide for learning how to repair electronic items like a wizard minus the normal expense. Ive heard some decent things about it and my mate after a lifetime of fighting got great success with it.
"I rewound the choke because I had some time to do it, and of course it worked."
Love it.
That's great and wonderful if you did it perfectly. Hope you enjoyed the process.
@@JahanZeb1976 Sir, I think he is quoting you from this very video. You might have forgotten the video but we don't.
Thank you for your expert instruction. This is the most useful troubleshooting video for ATX PSU, yet!
Thanks dear friend for liking. Keep up watching for more useful videos. Best regards,
Dude, you're really passionate about the electronic stuff (your job, I'm guessing) and it's always nice and inspiring to see that. Keep up the fine job and thanks for sharing your knowledge. Btw, I just subscribed tp tpur channel.
Wow, can't believe this guy is giving advice on repairing electrical components. Anyone else spot the two bare wires going into the wall socket behind him? (set video to 1080 on full screen and have a good look) This made my day, I really needed a laugh...thanks.
+jakese7en1 You can only laugh and will only laugh. Any thing else is beyond your abilities! Instead of pointing a very small thing look at the subject which is being discussed. I was testing it in an expert way. A lay man was not attempting the repair that you are pointing two wires. A practical man is never ever giving attention to such "Calligraphy". If the video didn't work for you, no worries as the same time it worked for thousands. So instead of doing a negative comment just pass the video and go ahead. Also giving a look to your channel shows there is no single video upload. I am challenging you to upload something of your own better than me.
+LearningZone Actually I am a PC technician, I've fixed thousands of PC problems. Saying that I've never fixed a PSU, so my hat is off to you for that. BUT!!! two bare wires into a wall socket is not a small thing, it's outright dangerous.
+jakese7en1 You are right dear friend but as I already explained, here I was the only working on such unit. So I understood the risk. If there were children or ladies around, sure I had to protect it very well. Another thing is PC repairing is not only my job. this is a hobby. And when I am shooting a video, there is much more to do than to give attention to wire insulation etc. There is my other video coming on where I am doing even more dangerous testing. So you will become even angry on that.
+LearningZone I will look forward to that, as long as there is no ladies and children around it should be OK, because we all know men can take 240 volts no problems!!.
Very precise and exact the to the point. Thanks Great work, best regards
thanku for sharing this sir loved your work :)
Thank You. You gave to me useful information
Well done sir TKQ a lot for video and demo
good vid..to the point..watched it 6 or so months ago...but forgot bookmark..glad to see its still here...took almost an hour to find again...lol
Wonderful comment. Great that you liked my video and bear that much pain to get it again. Great people like you must subscribe here on my channel so that you will always be in touch.
"before they were 20 pin now they are 24" , as a kid that grew up with outdated hardware ... i can relate to this so much ... so nostalgic sir ^.^
Yes
I like your presentation good practical knowledg.
Nice channel sir! I've an associate engineering diploma in Electronics too.
That's great dear friend. You are so nice.
Great job! Very cool....thanks!
lol "capastrus...."
Nice video man thanks a bunch!!!
+Wavyboi Graphic Thanks.
Sir wonderful lecture thank you
Love the bare cables rammed into the power socket at the start.
Plugs are for overrated.
Nice video.
I like the video, just wish you would've shown how to remove/replace both the choke and at least 1 cap. It's nice to see how all the intricate pieces work together. Good job with the oscilloscope as well -koodos.
Thank you sir.. thanks for your reply sir...
Great video.
very usedfull thank you
VERY INFORMATIVE THANKS KEEP IT UP.
+Basheer Khan Thank you for liking video. Subscribe and stay tuned. A lot of videos will come on.
Very nice thank you for the awesome video
Thanks for liking dear friend. Stay tuned for future videos. Best Regards,
very useful video my dear friend!! keep it up and upload such type of video. really thanks worth watching it.
+pranay sao Thank you very much dear friend for liking video. You know the weight of skill that is why you liked the video. Otherwise there are 30 dislikes out of 355 likes! I don't know what people want to watch and what is their expectations? What I did in this video was an extreme repair where I wound the torrid myself and had shown how to diagnose a shorted component which is mostly a pain in the neck. Regards,
A switching power supply does require a load to work properly, but you seem have knowledge of this power supply to repair it, Very well!!
+Neilrrc37 Thanks dear friend.
that was so nice boss
Great video. I hope you've made the video on the repair and rewinding of the coil. I'm eager to watch it.
I didn't film the winding process but will do it next time for your interest.
@@JahanZeb1976 Right , i was dissappointed not to see it. too bad. Thanks for the video though
@@eddieloius4592 what's too bad? Beauty is in one's eye. Anyhow thank you for watching.
Sir, I want to ask, PSU Seasonic, if the switch turns on immediately (without connecting green and black wires), what should be checked? (PSU has been removed from the casing)
Thanks!
thanks for this inf .
You most welcome dear friend. There are some other videos on my channel regarding SMPS power supply repair. You may watch those to get into the subject a little more. Regards,
great job
Thanks. Stay tuned.
Most of these can be repaired without even powering on the scope. Its normaly shorted switching transisitors causing a dead bridge, bad caps, blown PWM and diodes. Good video.
Dooglesman Yes dear friend you are right. A shorted power supply could be tested and repaired using a regular multimeter but reason for using scope here was to show the short circuit behavior. The acquired knowledge will help somewhere else in future repair work. Regards,
LearningZone Thank you :)
Hi I have a Dell smps that has partial functionality but I dont think it is providing full power. My question is should I be able to short out the 12volt power rail to my multimeter and get the amp rating on the spec sheet. What is happening is when I attempt to do this the supply shuts down. I can do this with 5v and 3.3v but the amp rating is much less than spec and the atx psu keeps working.
Very informative video. Same issue happened to my pc. Its been dead since 4 years. Could you suggest me a good brand 450watt ATX SMPS ?
Good lord, the entire input filter stage and input protection is missing from the board in that PSU, they didn't even bother populating it (just a single glass fuse is used). There's no output protection and no PFC which means nasty output transients are possible. And those dinky FETs, output diodes, and heat sinks... 500 watts my ass. I would be amazed if it were stable at 250. I'm surprised only the output caps and inductor died. That thing is a time bomb
Maybe you are right. But it worked and is still working in a PC. Everything can be a time bomb!!!
You're a good tech, and it's your PC. I just wouldn't trust it in mine.
Your shit is the shit!!!Good job. i tried to replicate your job to a slimline power supply with no success because The burnt choke is located right inside the heat sink of the voltage regulators
I agree with Dacke and would like to add: the 330µF input capacitances are pretty much undersized. This PSU is crap, I wouldn't trust it either... Nice video, anyway :)
Yeah it's probably from 1996.
Good job man. You speak very fast but its useful for my English learning. I'm technical electronic too.. Those power supply are cheap and worst for med and high levels PC. I choose for certified power supplies only.
+videosagb Thanks sir. subscribe for future videos.
Thank you so much - it was very helpful - think I got the same problem with a power supply - also I supscribed to your channel :)
That is great my potential subscriber that you are attempting to repair your own power supply. The purpose of the video is to encourage people to get help and attempt their own repair. Regards and wish you good luck with your repair.
Would have loved to see how you did the rewinding, and the soldering.
Yes yes. I'm looking for that power supply and will load that for you. That time it ran the pc.
Rectifier ke liye 2diode RL207 ka or 2diode 1N4007 ka use kr skte h kya sir ...?
Thanks a lot !!!
You most welcome dear subscriber.
I have this true rated PSU that turns on but the thing is doesn't boot that computer, it just turns on the motherboard, CPU fan spinning, GPU fan spinning, keyboard and mouse light not turning on, no beep. I tried other PSU on the same PC and it turns on so PSU is the issue. all connection on every single wire are within the standard, 12v, 5v, 3.3v etc no issue in each connection, PSU fan spins normal. I usually get shocked when holding the CPU when installed in the computer. What may cause this issue and what component to check first?
sir thanks for sharing your knowledge your videos are really nice and clear to understated , I just subscribed to your channel. thanks a lot again
+shaik shamsu Thanks friend. Keep up watching.
Thanks, can you make a video of how pc power supply work especially on the chopping circuit and how the bases of the transistors are being driven
Yes sure. Soon I'll upload.
Hey guys. My pc had shut down a few days ago and I narrowed down the problem today. Everytime I plug in the 4-pin power socket on the motherboard for the cpu, the pc does not boot at all (no fans running etc). When I unplug the cpu 4-pin on the motherboard, everything is fine. The fans run at their at their normal speed (led and gpu). Obviously, there is no post since the cpu is unplugged. Did my cpu 4-pin power socket short circuit?
very very nice sir
Thank you friend.
Looking forward to receiving your feedback soon
hello sir your videos are really nice and clear to undrstand sir.. as im very new to the elctronics i dont have much knowldge.. sir show some more videos on pc smps sir.. how to repair the dead smps sir
Govind Katwa Thanks friend for liking videos. Keep on watching even automotive repair videos. You will get the best knowledge from them. Also subscribe if didn't yet. I am shooting videos according my work flow and requirement. Sure there videos will come as I will do more and more work on different systems. Regards,
Too cool...
+RIPSAWONE Thanks.
thank you mister for these information , please tell me how to rewind this shock coil at home ??
Thanks for liking video. Wind coil with hand, same number of turns in same orientation with enameled copper wire. Regards,
Nice work. I know that people can/will find things in this video they will try you to change (like the wires inserted without a plug in the wall and powerstrip) :) but don't worry.
I also like the lady voice playing (i think) with the baby in the background. Just like when i try to make a video at home, my baby decides to cry and scream :)
My only suggestion to the video would be to give more advise to the people watching, to not try to do this without proper knowledge of the dangerous voltages in the mains and entrance big capacitors.
***** Yes you are very much right. Some people are just trying to catch a small mistake and trying to make it an issue. There is one example that flies are sitting only on dirty wound and they just ignore nice and healthy parts of body! Same applies here. Terrorists are everywhere and are trying to lay down others. Your advise is nice and I will apply that in such future videos. Regards,
I changed the termister and the rectifier bridge that was bad and when i pluged one of the transistor and a resistance blew up do you think all the problems was from the transistor?
There could be a short circuit in primary or secondary circuit. Test for shorted components. Regards,
That is Good & well
Thanks for liking and subscribing. Regards,
On pin 13 on the 24 pin atx connector, is the ORANGE +3.3 V wire and the BROWN +3.3 V sense wire basically the same wire? Can i use a BROWN +3.3 V sense wire on pin 13 instead of a ORANGE +3.3 V wire? I'm making a adapter and i only have a BROWN +3.3 V sense wire for pin 13, so will it work just the same as a regular ORANGE +3.3 V wire?
Late, but ..... the brown is IMHO like a remote sensing compensating on cable loss and should reach the connector in your adapter. If not possible, just tied orange and brown, then continue with brown.
Very nice video. I have a problem with a PSU (thermaltake tr2 600w) after low voltage on input AC 220 (160 or less) my power supply Die, but my motherboard show green light when connected. PSU won't turn on even manually with green+black wire together. Do you know what can it be? What can I test? No sign of burnt or smell. Thxs in advance!
It seems some problem with your psu. Repair or replace if possible. Regards,
Hi, if the capacitors measure 20-30% more of the printed value, they are still ok or it's better to replace them? no bulge etc. on them.
Not a must but if they went bad in ESR value, for sure you will replace them. Regards,
unfortunately i don't have a ESR meter, thanks for the reply.
You should mention and know that most of the ATX power supplies need some decent load to really start up and keep their specs. If you start it with no load it will shut down immediatly and even can be damaged in some cases. The earlier versions 1.0 just need a little load in the 5V rail but the newer ones need more minimum load on nearly all rails separatly. They probably will come up for short time but run instable and can be damaged.
thanks
sir three transistor are used in SMPS power one of transistor has blown off number not tracable other two ransistor which are ok are TT2146 can you tell me the number of blown off transistor
how to wind that torroid choke coil.. what are the turns specifications and winding directions.
+ubedlohani I guess he counted the number of turns and noted the winding directions while unwinding the damaged coil. Since there is only one coil he must've wind it by hand. This was the way that I used to do so many years ago.
my atx smps near the main power supply 03 pin socket spark and sound is coming i can not connect the power supply how to check or trouble shoot this
Sir what about the rezistors at the output ,is it possible the choke burned because of rezistors ?
+raziel x2k They could be but in very rare case. Mostly caps and inductors are going bad.
Sir: Do you have any blown PSUs for Dell Optiplex 745 SFF? I need a connector that is on that supply, to power a dvdrom.
I am sorry at the moment I don't have one. But if I would get one in future, I would let you know. Regards,
Search Internet for "sata power splitter". And if you have access to old PC parts and soldering iron, you can make your own in 15 minutes.
I would replace that PSU with good one. Bad PSUs destroyed two of my PCs so far.
Can i use one ground for all voltages like +12v to a boost converter and +5v for lighting led with just one ground cable?
Yes sure. But consider current rating. The circuit current shouldn't exceed the negative cable current carrying capacity.
@@JahanZeb1976 i have another question if u help me i will be gratefull can i combine gnd of power supply with gnd of phone charger ?i wanna make lab bench psu with fast charger by 2way switch and volt amp meter to swithc between them
Yes you can as long you may not combine positive along with ground conbined.
Someone has warned me to NOT open the CPU to blow away the dust. Let it rest for a couple of hours. As there can be electricity in there? Is it dangerous? How would you go about it? I've seen people hit the power button when it's turned off to discharge.
I have the same problem like the one in the vid. Replaced the burn choke filter and runs like a champ. BUT, it runs very hot, easily 70 degrees (cant touch it). It runs hot even under no load. Voltages are PERFECT. Wondering if the choke will burn again and way ... Could you help me ?. Thanks. Nice vid.
Seems you have bad capacitors after filter. Replace those electrolytic capacitors with new. Stay tuned and blessed.
@@JahanZeb1976 Many thanks SIR. Im reparing this ATX to make some money and sometimes I stuck so bad on some of them, can figure out what is going. One question sir, what is the expected freq. The PSU now is at 29Khz and dutyv cycle is 78% (Im using a multimeter with Hz and duty cycle measurement). I changed the set resistor to get 50Khz, now duty is 25% (seem more reasonable). But the toroid is still too hot. I will check caps today. Any other suggestion will be very welcomed. Many thanks and bless for you. EDIT: Added info. Chip is ATX2005, is very similar to SD o SG6105 (not sure if this is the correc number for it) TL494 + 339 combo chips. Its PWM + supervisor. Both inputs work. Input transistor not shorted. Diodes not shorted (at least measuring in the PCB). The choke is for 12V and 5V and -12V. The 3.3V is in a separete choke. It runs hot too, but not as hot as the one I told you. Interesting fact, not sure if you have used this ATX testers (the ones with a blue screen showing voltages and a couple of alamrs), the TESTER ALWAYS have a warning on Power ON delay being 0ms. Normally is 300ms, 350ms .... ummmm It turned off and back on (alone) a couple of times and in one oportunity it took like 3 seconds to start. Thanks again for you patience and time.
Great. You have excellent knowledge and research! Hope replacement of output strip caps may help cool down the toroide. Let me know your findings and success. Best regards.
What capacitors volts and uf types are replaced
Thanks man. cool video. My Pc's power supply burned recently. I found the input voltage was set to 120 and plugged to a 240 source. I opened the PSU and found one of the two big capacitors on the primary side(640uf 200V) with the adjacent resistor and blue two legged flat component( reads RV) is burned. Can this be fixed or ........ please comment Thanks again
+Jesus saves Yes dear friend it could be fixed if you troubleshoot it with patience. Better if you watch my other recently uploaded one video on power supply repair. It will give you some more idea of testing and troubleshooting. Regards,
Please upload more videos on circuit repair
Sure. Stay tuned and blessed.
How did you change induction, my toroid inductor looks black and always heats up, what do i do ?
Can you do a tutorial on how to change it ?
Hey my power supply won't turn on at all could you maybe help I can't find the problem?
maybe you didnt plug the ground cable? A.K.A yellowgreen
Ground cable is not necessary for powering PSU. You can get electrical shock or damage your oscilloscope through earth ground cable.
Maybe the green wire is damaged
To rewind the choke, you just have too get the same number of passes around with a bare copper wire?
Enameled (Magnet) wire is required.
Yes same number of turns, with same orientation. But the wire must be anamelled insulated and not bear copper wire.
Which colour you short it to switch on power supply green and....
G and b
hi its great video i need you little help please must reply. i have codegen atx supply model 250xa1 similar in your video but little bit different in circuitry. suddenly its stop working. every thing is fine no faulty caps no burnt coil, but when i turn on it nothing happened. stay off. but i have 5vsb. what should be possible fault. its schematic diagram available on net u can see the schematic and help me. hope for your positive response sir.
Thorough testing is required. Maybe you would have defect in the main smps section. Look for burned components, pcb tracks, loose connections on the main smps primary. On the other hand secondary switching can go defective which is responsible to switch on the main smps primary section. Also check optocouplers in the circuit. Make intense testing to figure out the fault.
What about powersupply that had red option (115) volts and then were connedted to 230 v outlet! How do you find the dead resistor or transistor?
In such a situation it will make a catastrophic damage to the circuit board. You may test for all shorted components and replace them with good new ones. Regards,
LearningZone Ohh thanks, Can you make a tutorial video how to diagnouse circiut board and how to check the components and reglage them?
After I replaced burnt capacitor 5 v standby disappeared , am guessing was not careful enough and destroyed a surface mount component , was a compact PSU with pfc , components packed in like sardines.
Since posting this comment I have found a transistor near the standby transformer that has no conductively what so ever so am hoping a replacement will at least bring back standby ,,
SIR...its my humble request...kindly suggest ANY substitute MOSFET for SSP2N60A for Computer Power Supply.....
REPLY
You may try easily available and cheap IRF730. Regards,
I have a power supply. lc power 550w. It wants to power on but the protection circuit powers it off. Ive checked the inside carefully and I cannot see anything wrong. I dont know whats wrong... plz help
Sure there will be some short. Check again the secondary and primary circuits for any possible short. sometimes capacitors have dynamic short which is not coming in troubleshooting using ordinary methods.
I got only 5V standby, what's wrong with it ?
Yesterday, I connected to a bad motherboard ....can it be 12V rail broken ?
Any ideas ? thank
I can hear high pitch from power supply...
Probably there would be a short on 12V or 5V rails. Check it and repair whatever is shorted. Regards,
so how do you check for shorting? do you check at each individual capacitor level?
I got problem on push pull transistor for switching, fixed already, thanks
Sir, Would u upload a video how to repair the power supply for Copier IR6000 please. Almost video just showed how to change it.
Sure dear friend. But I don't have this particular power supply so that I would try to repair it. If you have one spare and you are able to send it to me, I will try to explain its repair. This will be an opportunity to many more people looking into this subject. Regards,
sir can you make video tutorial about motherboard desktop how to test in multimeter and also can you determine about the diode voltage or give me schematic motherboard i appreciate your work and i want to be your student i want to learn what you have....thank you sir
Meri atx k 12v ki bajay 9.5v aarahy hein .kya problem hy??
Hi, I am using old dell pc smps as 12v 7ah power supply, initially works well. Now the issue is when I connect 12v 35w lamp the smps turns off until it's power on. But VSB 5V power only available and all other turn off. I tried same lamp connected turn on the main supply lamp is glowing and disconnected the lamp n connected again little spark coming and turn off smps expect 5v VSB. Pls help what needs rectify
You burned some components inside. They need replacement.
@@JahanZeb1976 thanks sir, I found issue in shunt resistor. So I have shorted that its working now.
My supply turns On for a second and then switches off. Happens every time I try to turn it on. Do you have a solution for this.
There will be sure some short on the secondary side. Check and repair. Probably bad electrolytic capacitor.
ok thanks
Having the same situation. I read a lot of articles and found that possibly the compacitors may be dead or exploded.
I have ATX 450 watt power supply will this technique work in ATX 450 watt power supply and what is the cost for a new power supply
This may work where there will be a bad output inductor regardless of make and model. Maybe you have some other problem with your supply! test and troubleshoot. The cost for new supply vary from model to model. Regards,
Biggest transformer is for main rails middle size one is for stand by voltage for 5vsb and pwm controler :D and smallest one is gate drive transformer. :D
+N!cky Nice explanation. Thanks.
I don't see it in the list of posted videos or do I have to do some extra search(the new vid)
+Jesus saves This is the third last video uploaded some two weeks before. The title is Router 9V supply repair. Maybe you will get some understanding from that repair as it is a repair on the primary side of the power supply and also latter in the end of the video I show how to use series lamp testing after your repair. Regards,
plz help i have bought a compaq deskpro en and the mobo flashes MEANING that there is a problem with the PSU and i readen that i need to replace it but the other psu i got DOSENT MATCH THE FACTORY PSU WIRING
In such a case you must have to repair the existing bad power supply.
nvm its a bios prob when i booted it up first time i cant pass the test so i added the 32 megs ram and saved then the 128 and the 256 so i can boot up
it is qinda sucks
What do you mean it doesn't match the factory PSU wiring? Are wires with other voltages in places where they shouldn't be? If so, you could just rewire the ATX connector to match the old PSU. No need to cut wires, you can remove the female pins in the connector with a Molex tool or a steady hand and a needle or a tiny flat screwdriver, like 1 or 2 mm wide screwdriver.
Aristarco Palacios lemme see late 1 year? OH WELL i already fixed that problem by doing a trick
insalling only 32mb of ram and letting it memtest so it dosent crash
then add the bigger ram and it dosent need to redo the test
oh well IM INSTALLING WINDOWS 98 ON IT NEW XD
btw how
can
i
burn
a
frikkin
floppy
on
a
laptop
I'm going to repair my Powermac G4 PSU since those are kinda unobtainable
Wish you very good luck 😘 with your repair. Hope you will bring it back to life.
All of my damage PSU's get low voltage output like 4.7v in 5v rail or somtimes 11.4v in 12v rail.. but when i open it i don't see any bulging capacitor.. can you spot the problem?
You should check your capacitors using ESR meter and then replace all bad value capacitors with new good ESR value capacitors. This may fix your problem.
LearningZone does transistors had nothing to do with it? i had replaced capacitors with new one but the voltage is still the same.
Have a power supply only giving 5volts out-put what could be the problem any help
If the only standby 5V is available but the supply is not giving output on shorting those 5V to ground, Sure the is some problem in the power side. check for any possible short in the output and input stage.
Sir mere pass dell t3500 working station he usme jese hi me pc start karta hu to 2-5 seconds me off ho jata he or dekha to psu shot ho gya he to me usko kaise repair karu plzzz sir ans.....
The three yellow parts you called "power supply" is what went wrong on mine.
One of them threw sparks. Do you know what those are called or how to repair them ¿
+The Sqoou The three yellow parts are transformers. The bigger one is the main transformer and the smaller are standby power and other associated power supplies transformers. All are necessary for perfect operation of the power supply. They go bad very rare. They are not common replacement part as the failure rate is very rare maybe 1 out of 1000! The replacement process is easy and is simple de-soldering and soldering. But the main problem is their availability. The only one way to find them is to look for a badly failed power supply having same transformers and then salvage them from that board. Hope you would understand what I expressed.
+LearningZone Yes. Thanks you. I looked in a few old power supplies to see if any match. I will likely buy a new one soon. I still want to fix the broken one to see if I can.
Thanks for the information. and help.
+The Sqoou Sure that is the great way of learning to fix old things instead of throwing them away without looking into them. This is my way as well if I am replacing something with a new one, even I am looking inside the older one and that older one is greater than the newer one as it is increasing my knowledge.
You can dismantle your broken transformers and rewind them in custom way if you are careful and skilled enough. The rule for rewinding will be what and how you are removing, same and same way you would have to fix back in. Better make a note while dismantling.
So wish you good luck with your repair and share your success results here with us.
Could anybody help, one of the pins on my 20 + 4 plug is twisted and I can't plug it in to the motherboard properly
Seems nothing so bad that can't be fixed with small pliers and flat screwdriver (or knife).
My power supply turns on runs fine(for the mos part) but my pc reboots(sometimes shuts down) when I try to play Games or put load on my gpu. Could it be a PSU or GPU problem?
Clean your PC. I thing it is due to dust and dirt in the processor heat sink area.
It's either heating problem or your PSU. It may not provide enough energy to power your PC
this psu has 15A on the 12v rail, meaning it can barely reach 250w continuously properly. Even at peak wattage for a few seconds, i can't imagine it will reach 500w. Just to give a comparison, my 400w gold rated psu has 32A on the 12v rail. So, this is a very good video, showing you have superb skills, but i would advice to get another psu because it is of very bad quality and will damage the whole system.
Yes you are very much right. This was only for demonstration. Thanks for liking.
I have one just like this in the video.. And me accidentally did not switch from 110 to the 230 volts side. When I plugged it into the outlet here which is 230 volts And now it won't work and I am confused on how to fix it. Not to knowledge of where to start. Not many repair shops here where I am here. Note this not going in a Pc. But a duplicator unit
Great to watch video. How did you find it? Useful?
You must check components on primary side. Replace defective power transistors, IC, rectifier diodes and big smoothing capacitors. Hope will lesson from you after repair. Stay tuned and sub.
주제와 벗어났지만 오실로스코프 브랜드가 골드스타네요...
Smashing recovery of a quite usable switchmode psu :-))
I think the label is telling lies, it does not look strong enough to cope with the power levels stated, larger heatsinks and a really good fan would have been my choice.
But manufacturers love to cut corners :-(
I have also repaired switchmodes, but most of them have been dead output capacitors and earlier stage capacitors that prevented correct operation.
Another typical problem for old supplys is the standby sub smps, the pc is off but the 5v standby smps can be on for years without a break!!, it dies and there is no primary power to the control pwm chip.
I have fed 5v through the the standby 5v line to test the rest of the supply, but later supplys use the standby smps to deliver a second voltage, so i cant do that.
The input rectifiers and resivour capacitors can explode, it makes you jump but often its repairable (as long as the chopper transistors are alive).
Sorry im rambling again lol.
zx8401ztv Again your knowledge is rock! You performed amazing works in your life. Always happy to see your comment. You are absolutely right. 5V Standby power supply is always on to make the PC soft on and off through software way. I experienced trouble with those circuit as well. Some times it is really tedious and time consuming as well as expensive to restore such power supplies. It is recommended to restore them if you have some junk supplies to grab parts from and in other case if the power supply is something special and is not easy to obtain new. Regards,
LearningZone
But like yourself im not appreciated, so any amazing repair is often forgotten by the owner, i dont mind as im used to the effect, im pleased with the repair and may have learnt something in the process :D
I have learnt that "Somethings are not worth it, its not because im not good enough." took years to learn this simple lesson.
The other issue with the cheap PSUs not being able to put out enough power is too small of a transformer. The main transformer (the biggest one in the PSU is the main power transformer) gets overloaded, and it "saturates", causing the switching transistors to fail catastrophically. Also, another failure is where a poorly designed 5V standby regulator has a bad capacitor. Because of a poor circuit design, the capacitor failure causes the output voltage to increase, even up to 20 to 30V, frying the motherboard....!
Benjamin Esposti
Ooow ive never seen a standby circuit do that before, but there is time lol.
I would imagine the over saturation of the core would create a massive current overload for the driver transistors, booooom!! lol.
Ive repaired them but never really looked too close at the technical side.
I have a mates pc motherboard with a couple of the mosfets rather ill, well dead lol, for no apparent reason it went pop and the main switchmode was shorted out by the high current cpu psu on board.
As there are 4 parallel sets of mosfets and driver chip i removed the dead mosfets, and the mobo works with all voltages correct, any ideas on why it went pop?, everything was stone cold, perhaps its just a crap asus mobo lol.
More elektronic vids, pls
Stay tuned. Soon more video will come.