Computer Power Supply Repair - DEAD bad capacitor No / Flashing Green Light
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- Опубликовано: 28 авг 2024
- Good replacement power-supplies on amazon → amzn.to/2xzA7QG
How to spot a bad power supply and how to fix it. This one has a Flashing / Blinking Green Light HP P/N. 5188-2622 BESTEC ATX-250-12zZ REV.:D6R
This is an exact replacement for mine→ amzn.to/2x2V2KL
Repair a dead computer.
Absolutely superb tutorial. My old compaq pc power supply had exactly the same fault and the same dead capacitor.made the replacement as directed and the pc is now working perfectly. I cleaned both fans while it was dismantled and it now runs quieter than ever. Can't thank you enough for your instruction. Pete.
You can use down to a 6.3V capacitor to replace this particular capacitor. Usually, Bestec installs a 10V capacitor, but some revisions such as yours had the 16V part. This circuit carries 5V. I've reused 6.3V 2200uF parts from motherboards to replace that cap. It's that one and sometimes the nearby 220uF 25/35/50V capacitor that will cause these units to act up. Also, the caps over on the secondary tend to fail. The Bestec units tend to have capacitors from Jamicon, Teapo, or Capxon in them. The Jamicons usually last longer. I've recapped enough of these 250-12Z units to lose count. The one unit to avoid fixing altogether, is the 250-12E... this unit has a faulty 2-transistor design 5VSB controller that fails with time and takes out the motherboard. eMachines were notorious for these units burning up, sometimes violently.
I had exactly this problem on our old HP desktop. Followed diagnostics from another video and concluded it was the motherboard. Bought a cheap secondhand replacement motherboard but still the same problem. Saw this video so stripped down the power unit. Exactly the same capacitor had blown C63 on the pcb mine was 2200uF but stated 10V not 16V. It had a bulged cap so changed it out. Had a very old pc in the attic to get some spares. when rebuilt it fired up perfect. Just had to reset the clock as I had removed the CMOS battery in my tests but other than that all is back to normal. Time for an upgrade i think before it fails completely. Like you I need to get a solder sucker as that makes soldering so much easier.
FIXED MY DAD'S TOWER POWER SUPPLY and it is still going strong. Thank you very much, we saved a lot of money and hassle.
I have this exact PSU and HP model on my bench right now. Same CAP at fault too... There is another on the other side where the 5V/12V to the peripherals comes out that has bulged. The first indication to me was the dielectric odor.
These BST PSU's in this series suffer from inferior Caps, specifically capXons, but other cheap manufacturers have been a problem too.
The other thing here is the placement of this particular cap near a heat sink. If you notice the power rails it is soldered into, you can drill two holes on the other side away from the heat sink and solder the new cap over there, and electrically it will be the same connection, but physically away from the heat source.
These caps are supposed to have a lifespan of at around 7 years, which is about right for this situation since this unit is at 6 years (2008). The other thing is that the user of this unit hasn't cleaned it out since it's purchase, I blew out a large amount of dust bunnies. I also redid the heat sink goop for the processor, seemed a bit dry...
I'm going to swap out all of these caps with better ones for this PSU.
I used this video as reference before trying to fix my power supplies... I had 2 of them that were broken, found a bulging capacitor on the one but couldn't find out what was wrong with the other, so I took a capacitor from the one that happened to be the same and replaced the bulged one. So from 2 broken power supplies I came out with 1 good one!
It's likely that another component on that other power supply died. It could be a resistor, voltage regulation module, or one of the diodes on the PCB.
Wow, can't believe this PSU needs new caps... the computer doesnt look that old. Congrats and thanx for the upload.
I have seen quite a few PSU videos and this is the most informative. This makes me wanna unsolder all the capacitors off my dead PSU to save them for later.
Nice video! Just FYI, you can use a 6.3V 2200uF cap as a replacement for the bulging capacitor next to the heatsink. This capacitor is part of the 5VSB circuit and when it fails, it shorts out, causing the 5VSB circuit to "blink" seeing this power supply uses an I/C regulated/protected 5VSB rail. Try to use a 105C capacitor for the capacitor next to the heatsink because it's commonly the heat that makes the original cap fail, plus CapXon and Teapo are horrible capacitors to begin with. I've repaired so many of these Bestec ATX-250-12Z units, I've lost count, lol.
Its now been 4 months and I have had no problems with it at all!
While HillBrosTech is sharing knowledge, he’s missed out key points, the temperature rating of capacitor is also important, he’s replaced 105◦c with 85◦c, like voltage you can usually replace with a higher temperature, but not a lower. While HillBrosTech fix will work the lifetime of the capacitor will be greatly reduced.
Capacitors especially electrolytic (type shown in the video) have the shortest “lifespan” (MTBF) of passive components typically found in circuits. Thus using used ones isn’t really recommended, especially with the el cheapo brands he’s salvaged. Brands like Rubycon, Sanyo, Elna, Nichicon and Panasonic if you’re going to salvage might be worth keeping.
HillBrosTech didn’t cover discharging those large 200 - 500 volt caps which are typical in computer (SMP) PSUs; if your skin bridges the terminals of these caps they can jolt you across a room, burn, or even cause heart failure if they still have a decent charge!! While the battery analogy is okay-ish at a really basic level, a battery cannot dump all its energy into you in a split second while a capacitor pretty much can.
Thanks Lloyd for taking the time to share the info! Yes the caps are lower temp but that is what I had lying around. The computer is still working. The original caps failed when the computer was in storage for about a year. It was put in storage working and came out not working.
keep the effort up HBT ... i'm too lazy to do what you do!
Yeah discharging is very important advise....just get a couple of alligator clip wires and a resistor (higher value the better) for a quick safe caps discharge.
I have done this many times to power supplies, motherboards, monitors, and video cards. The crap capacitors they put on there usually fail before anything else does and can be easily replaced with good quality capacitors like Panasonic and Rubicon. Small caps like the ones in PC components are very inexpensive and could mean the difference between paying a couple of bucks for a cap or a lot more for a new component. Just be safe and watch more tutorials if you are not sure.
Its people like you on youtube that make this website great. Good video, man. I didnt even need this video but it was interesting and I learned, thank you.
Dang! Got any thicker solder?
Just this afternoon I dismantled the exact make and model failed power supply as pictured in this video from my 2008 HP computer. A visual inspection revealed the same bulging capacitor as you found. After scraping the white putty off the tops of the other capacitors I discovered TWO more budging defective parts. After de-soldering the three from the board I noticed that all three were black colored and of the same value (2200/16v). Every other cap on the board was colored a dark reddish brown. This indicated two different manufacturers. There are three more caps of the exact same spec (2200/16v) and one 2200/25v colored dark reddish brown that were perfectly fine. You may want to take a second look.
Be careful with this bestec PSU.
When the capacitor goes bad, the 5VSTBY (purple wire) can go unregulated - I've seen it go up to nearly 30V!
It WILL fry a motherboard in that sad state of operation...
The temperature rating of 105ºC typically means about 2000 hours of life at that temperature. Beyond that temperature (and hours at 105ºC) the cap will degrade and its uF value will drop. Eventually it will be useless and an open (0uF). 85ºC same thing, except all that will happen even sooner. The cap he replaced is right next to the heat sink, this would greatly reduce the caps overall life. Classic issue. Great vid - by the way!
Thats the worst soldering ive ever seen!
I can show you worse.
Hah hah... Practice makes perfect... :p
Who gives a shit what it looks like if it works?
Totally agree with that the soldering is terrible. Guys, at least practice before making video!
I love how everyone is a freaking expert and a vulture, just waiting to say shit. Where's your video? It works.
lol
Thanks for the video, am having the same issue, but actually i cannot find the bad capacitor, any hints?
Thanks for your video. Technical Question: it is a good idea to discharge all capacitors before atempting to repair a power source??
Yes!! Unless you get a rush from running the risk of getting zapped haha
About soldering. After you've soldered the replacement part, hold the pc board flat, and heat the lead from the bottom keeping it flat. The excess solder will run off onto your iron and it will look like it did when it was run over the solder bath when it was made. Does a neat job. Just saying....................'MIke.
That blue one was also the most unsafe one to use. Power supplies require high temp caps, the one you put in is rated for 85c, not like the 105c caps that are required for power circuits.
I understand it's still working but the 105º degree cap used maybe because it's near hot components or heat sink, and needs that rating. It may just be that the 85º is fine and the psu manufacturer only used 105º coz they already had stock. Strictly speaking you should always match or exceed the ºC rating.
Thanks, I found 2 faulty capacitors and replacing them fixt the problem.
Fixed my PSU after watching this. Thanks for sharing!
Nice job. Had a similar capacitor issue in a LED monitor. Replaced it and hey presto, working monitor again. $3 for 10 caps from ebay, with free shipping.
Excellent job, that was truly computer repair to the deepest. You ace it.
Ebay, or specialty electronics stores. I pull them from old radios, tv's and vcr's sometimes.
Thanks for the video.
My Bestec ATX-300-12Z waz flashing the green light.
I changed the puffed 2200uF 10V 105ºC by a 16V new one (same ºC and uF).
Totally woth it.
i'm having the same problem and same computer as your....same HP computer..thanks for showing this clues
Don't PSU store power even when its unplugged? How do you drain out the power??
+Kayemache You are correct. BE CAREFUL WITH THOSE BIG CAPS. Always use a high power rated resistor, hold it with some pliers and connect it directly to the caps leads. Do not short the capacitor leads as it can destroy it and possibly damage other components.
Lazar Šaronjić those big caps jolted me across the fcking room
I always use the of my Soldering Iron ac plug tip to touch the 2 terminal of big capacitor to safely discharged it.
You wait a few minutes. Usually they have a diode or a resistor in the circuit that is supposed to drain them.
One way is a voltmeter with its built in resistors. IF just ripping it apart for parts - drop it in a bucket of water.
You replaced a 105ºC capacitor with one of 85ºC. Did that bring you any long-term problem?
Cause I just did that with the two bigger caps...
My computer doesn't turn on after power outages until about 2 or 3 weeks later. Any ideas on what I could try replacing on the inside?
This has happened with my computer about 3 times now. I have a Compaq Pressario. I tried replacing that battery and that wasn't the problem. Also when the green back light comes back on there's usually no problem with the computer until we get hit with another power outage with the computer on.
can you use those aluminum solid state caps of same value? instead of electrolytic
Thank you ... good info. Repaired 2 pieces.
Hi nice and very informative.I opened my Bestec ATX0300D5WC and found out that my varistor bet the 2 big capacitor burned.I don't know whether to replace it with a 100 v or 220 v? pls help
Can you please tell me the name of the component that is wrapped in black heat shrink tube and connected in parallel to the big bulk capacitors as shown at 1:57. My one is completely blown so could not look for a part number.
Its planned obsolescence placing the capacitors near heatsinks .
Replace it and cover it with some heat resistant reflexive tape . (white glass fibers tape)
dear sir
what a great vedio. same problem i NOTICED IN MY CPU wow 0nly for $1/2 the problem fixed thanks a lot kind regards
Maybe ali has been a little blunt but a bad solder joint can fail. This may just cause the psu to stop working, fine, however it can pose a fire risk. A broken away blob of solder can cause a short that starts a fire. The capcitor falling out may short something, with either the legs or top vent. BTW thats what the white glue is for!!! I applaude the video author for his cost saving video but there safety issues here.
A little knowledge is more dangerous than none!
Good job.
1 year ago, i've changed my old pc power supply switch from 220V to 115V and the only thing i saw was smoke. From then, i haven't used this COMPAQ PC. I really want to repair it now, when i 've got bigger knowledges, but when open the PSU all the capacitors are looking ok. Is there any chance, if i change the fuse, to repair it and it will work again? Thanks in advance.
s11.postimg.org/wegte27j7/cracked_capacitors.jpg
Really helpful tutorial... Thank you very much!!
Thank you so much for this video. Very understandable. This was the answer I was seeking. Thumbs Up for You!!
Hello Hill, i have a question for you-can i replace a broken 500 watt power supply with one from 235 watt? thanks in advance
Hi, recently my PSU has become strange where my pc does not power on anymore, sometimes it does.
I particularly noticed this when we have been having many brown outs over months and months.
I do have a good surge protection plug which i spent alot of money on, i use the same for tv etc.
After giving up because my PSU just does not come on and the red LED light is not coming on at ther back either, i decided to take out the PSU and do a test on it.
I bridged the Green pin and the neighboring Black pin with a paper clip.
Plugged in the mains and turned on the plug switch.
Then i turned on the psu switch and the fan started to turn.
I tried to turn it off and on again, the fan does not turn.
I tried to unplug everything and retry a few times waiting a few minutes between each test, it seems the fan spins when it wants too and the red LED light goes on when it wants to.
I opened the PSU up and found that one of the BIG capacitors is swollen and the top is leaking fluid.
Can this cause the PSU to behave this way?
I am wanting to know before i hold my breath and find a capacitor to replace.
Does your Ac input Amps have a impact on your PSU turning on i have a
evga 500W 80 plus. That won't turn also i had a 600w that did not turn
on so i exchanged it for a 500w power supply. Would a power strip help
with the problem?
You can't just replace capacitors. You also have to look at the temperature rating!
Thanks for posting this really helped me.
try thinner solder & also try an old trick of clamping the Iron giving u a free hand
HBT, can you help me, some days ago my pc made a very loud bang, and i am worried that it was my psu. Can you confirm if this kind of bang is caused by explosion of a capacitor inside the psu? There was no visual smoke or smell noticable. Thanks for your reply
hey great video, i have a psu that want turn on while in a computer an when replaced the computer starts up fine. but the original psu will turn on when jumpnig the green an black wires on the 24pin connector while out side the computer an will also start the computer up if i manually jump the green an black wire on the 24pin connector. any idea what could be the issue with this. i spend alil over 100 bux on it an would like to fix it if i could cause its a 1000watt modular psu an the one ive replaced it with want run both of my graphics cards. thanks again
You can swap the live and neutral over in a mains plug and it will work just fine... Because it works doesn't mean it's safe!
You can drive your car only using 1st gear at 7000 rpm, it'll get you from place to place, but for how long?
A little knowledge is more dangerous than none!
Put the solder on the tip and remove any excess before you then touch the connections.
that blinking light isnt programmed to do that if it detects a problem at least i think
my granparents direc tv box has bad psu capacitors and when you plug it in it sends pulses to the power light every 2 seconds
if you connect it to a tv you can make out the channel program search for a millisecond only when it flashes
nice video btw
Voltage rating is important because it has to be filtered. But capacitance is not. A Capacitor has other parameters as well. Capacitance is just one of many!
And CapXon KF is a so called "Low Impedance" series wich is made especially for higher frequency stuff. And there are no 85°C Types from any half way decent manufacturer that are Low ESR or Low Impedance. So replacing that with an "85°C" Cap means that replacing a good low Impedance type that is rated for 2000mA Ripple Current (or more) with some garbage that has half of that or less!!
You can not replace different types of capacitors!! You have to replace a low ESR type with another Low ESR type, you can NOT replace those with General Purpose ones like its done here.
what causes a power supply fan to start then stop?..No power on the secondary side or very little..I know I could buy a new 1 but I would like to learn how to repair instead of filling land fills with this stuff..
Hi. Is there a fuse inside the HP power supply. It's LED isn't lighting at all. Any fix?
Thank you.
God bless, Proverbs 31
Bestic power supplies must be the Best, right?
Can you Fix/replace a power supplies on/off switch? my switch wont stay in the on (-)or off (o) position,but is lose. and once in awhile it will just shut it self off.
Nice Nice Video about PC Power Supply. Now why not PC Power Supply that really matter as well.The Name Brand one's the one that power our home made pc's that have awesome gpu's,ram,cpu's as well. dell,hp & so on are ok but pc we as builders actually love.Seasonic,Corsair,Thermaltake,EVGA........ This Power suppliers to pc's & all other brands are worth the money. TY for Video
Pretty good, but you really should spend the $3 on a solder sucker. If you use those needle nose pliers, you might take the whole copper pad along with it. Also, tin yo' soldering iron!
Hi. My computer ASPIRE AX3475-ER30P suddenly shut down and beeps continuously, I know power supply might be the problem. How should I fix it before buying a new one?
Where can I find the schematic of this power supply model?
great video bro-ski. thanks
@BHT : Hoping u are around still ? 10 years later
I always have wondered...how come when we change capacitors the voltage can be higher than the original voltage? Wouldn't the higher voltage have any effect (positive or negative) on... the power supply in this case?
+no way This is because the AC voltage is often measured in RMS, or voltage/sqrt(2). So the peak voltage on a 120v line is about 170v, and it swings about 340v peak to peak.
excuse me HBT. how did u knkow the capacitor was bad? (watching with no audio sorry). It doesnt look bulged or leaked in the video.
I ask because my computer blew out with a loud pop and absolutely no power. So i ordered a new power supply of the corsair 600cxm series. I opened up the existing PS and did not find any blown or bulging capacitors, but i do see a small "something" suspicious on another object inside the PS. I learn fast but I cant find anything online to help diagnose and confirm that the PS is the cause. I have inspected all other components inside my computer. Is there anything you can tell me that I can look for in a bad power supply? PHysically? I have every symptom of a bad PS btw, im pretty sure it is the PS.
odiumimbues In most cases it's better to buy a new P.S. instead of fixing it. But for others it's easier to fix. Especially when you MUST get the computer running immediately and don't have time to wait for shipping. A "pop" could have been a cap blowing but they often don't do that. Mostly they just act half power or leak and totally die. Without seeing it I can't say what the suspicious thing was. Glue maybe? Things to look for are burn marks on the PCB, bulging or leaking caps, bad fuse, and anything fried or cracked. As for the computer in the video; look at this part 2:22 you can see the brown on the top of the capacitor. Thats the leaking fluid oozing out. Then I move the camera to the side and you can see a very small bulge at the top. Like a coke can. It shouldnt look like that. It should be completely flat. A bulge is a dead giveaway that the cap is bad.
Good job very helpful.
how did you know exactly that capacitor not working?
Nice job!
is it weird that i ripped out 2 broken capacitors outside of a dead xbox one s and got it working with a atx psu??? shouldnt SOMETHING happen? there were originally 3 capacitors but 2 of them were dead so i ripped them out and the console works completely fine with only one capacitor near the power plug near of the apu?
I have a cooler master 500w amps for my PC, since winter started the PC abruptly restarts /monitor goes to stand by in the first 10 min, but after 1 hr everything works fine, so today I changed the smps , so far the PC working normally,what could be faulty in the cooler master,it 's expensive piece.
Depends on what you're running, if you're trying to get by on the minimum power, that would be a big issue.
Daniel Kang the cooler master smps ok, removed it cleaned it and resoldered a few points on the pcb which I thought were dry, the culprit was the cpu, some pins were blackened so I cleaned them with an old used soft toothbrush dabbed with wd40, the blackened pins got amazingly clean & refitted the cpu , the system works fine even better than previous.
Also I have soldered the 5V,12V,3.3V,gnd wires from the smps directely to the mobo for maximum secured connection.
Those solder balls are bigger than a set of hairy ones :-D
my psu making buzzing sound what could be the problem ? thanks
I like this vídeo thank you.
My PSU is ticking constantly all of a sudden, should I have my PC off and not be using it until I can find a fix or even get a new one?
You can actually spend money on decent capacitors, not some Xinjiang special no revolutionary engineer would even touch. The Taiwanese ones are decent, Japanese ones like Nichicons and Panasonics are ideal. they cost almost nothing. 2200 micro-farad caps are probably a few cents. They will also not buldge and explode like cheap Chinese caps.
Which makes me wonder why companies who make PSUs would bother using cheap caps when the good ones are so cheap.
*****
Ah, yes. Screw the consumer. Always the way to go!
Soldering skill's had me cringing also. Reminded me of myself when I started. Hint: get yourself a scalpel or Stanley knife to cut across traces that you accidentally bridged. Buy a cheap roll of solder wick. It looks like braided copper and will suck the solder off the board when heat is applied to the back of it.Over on the uf is OK as it just more head room. The higher you go on heat %C is better. Cheap anything from China will try to place the voltage too low to save cost jump one level up.
where can you purchase the capacitors?
My psu fan working 100% all the time any ideas; its a new corsair hx850i
That looks so identical to mine!
thanks bro this helped a lot
this happened to me once, and the capacitor causing that was a CapXon, that proves that they suck real bad
just remember... if you're watching this video, you should still buy a new power supply. even if you manage to fix the problem, you're putting the rest of your PC components at risk. use the fixed one as a backup for your new one, or do whatever you want with it, but power supplies are very fickle...
Guess you haven't seen/done a lot of soldering? - given that he's working with what he has, I thought he did pretty well actually, and most importantly, it worked, I don't see any video's on your channel showing your superior skills, perhaps you just prefer trolling? Maybe you need to watch Bambi if your parents overlooked some basic manners in your upbringing!
90% of the time when this happens nothing is wrong you have to have the power supply plugged in unplug the 24 pin press and hold the power supply then while holding the power button plug back in the 24 pin and it should work
Thanks man it worked
i have had the same thing happen to 3 computers i have, personally it is the best trick in the book.
yeah remember that it will happen again whether the same computer or another one.
this trick looks to be tested! mine to made a sound when i tried to power up my pc and now nothing! there's no power coming out of the wires !
+atstech if it made a sound your supply may be poached
When replacing capacitors, make sure you install it correctly otherwise you risk damaging it.
I have seen some sstrange liquid coming from the psu (CM B700).Some capacitor is damaged but im still using the psu.Should i change it fast,buy another one or just replace the capacitor ?
Will Antec VP450P-EC hold on this system ?
Intel Core i5-3470 3.2GHz
6GB DDR3 RAM
GeForce GTX 960IX-OC
2x500GB HDD
Thx for info :D
+Mise Sapphire buy a power supply if you can afford it but if you want to gamble your chances buy the capacitor and do it yourself but if your fixing the computer for a friend or a customer you better off just replacing the power supply with a new one. less chances to fail unless they shipped you a dead powersupply that can sometimes happend .
rdbagaming
I have bought a new Antec psu :D
+rdbagaming And the Antec started leaking like the CM WTF ?
-Why every f***** psu is leaking in my pc ?
Ah you're supposed to pull it out while it's heated, I was trying to remove the solder first and hoping it would fall off
when I try to open my pc and fan spins but keyboard and mouse have no sign Also the monitor says no signal do you think it's my power supply?
Stick Run- HowTo i think the problem here is the motherboard
man i got same problem,but in my psu there is no bad capacitor,and my pc won't start.But when i take my friends psu and plug everithing back in than pc work's.My PSU:
LC POWER 550W Black NON-MODULAR
think id buy a new psu, poking around 400v caps on the prime side!! not good
My PSU was storing 100 or more volts on the main capacitors for a while, what can be damaged when that happens? For sure is on the primary but I can't find anything damaged :(
+hqdefault Found it, the transformer that connect to the secundary have a corroded broken pin :(
I have replaced obvious bad capacitors on like 5 different PSU and I never have any luck at all.
My PC made a small explosion sound and I smelled smoke. I just don't remember exactly if it happened when I plugged in the the power cord to the wall outlet or if it was already connected and it happened after pressed the "on button" on the PC but I was something like that. Anyone have any idea what can be wrong?
nice videos
The capacitors in PSU or motherboard shut be reading at 105'C and LOV ESR,its wery important !.
pls can u tell the schema
Hello my brother, am having this gigabyte power supply, its 550w, but it doesn't power my graphics card geforce 970.. Please, tell me what must i do to resolve the problem