Probably NOT The Best PSU Repair Video On YouTube! Faulty Apple iMAC Computer PSU Part 2
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- Опубліковано 28 сер 2024
- The parts arrived for the Apple iMAC computer power supply. Let's see how this goes...
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Thank you
Richard
![Lp. Сердце Вселенной #1 НАЧАЛО ПУТЕШЕСТВИЯ [Новый сезон] • Майнкрафт](http://i.ytimg.com/vi/380Q7gLWGvk/mqdefault.jpg)
I tell you what man I have been in this industry for over 30 years but I never have laughed as much as I did with this video great work keep up😃
New to the channel, I was always fascinated with electronic when I had a work colleague who was a ex TV repair engineer working in the security industry, he literally pulled a small bag out, removed the cover from the CCTV keyboard, commenced chopping and soldering and in next to no time, system all back up and running. (D.H) Great videos you make it look so simple 👍
Probably the most entertaining PSU repair video on UA-cam. Let's have some more fun with this PSU plus I have the faith in that I am sure you will be able to fix it.
I love your videos,they show what happens under real repair circumstances!
The lack of ferrite beads may have contributed to some high frequency oscillation but I've not known them to cause such a rapid breakdown, more likely a fake FET (but then dim bulbs interact strangely with some PFC designs). As you say, would be worth checking the driver chip, resistor etc and refitting the PFC parts (with beads) to see if that part was working. Those pesky E01 resistors (marked as 103 in the Australian variant, ho, ho).
Since you have the component tester if you have more of those dubious transistors you can test them to see if they are at least FETs and not bipolar transistors or something else.
Also I see comments about an incorrect package, but Infineon made the 6R199P both with metal tab (PG-TO220-3-1) like the spare and isolated (PG-TO220 FullPAK) like the original so you can get genuine ones in both packages. Both say PG-TO220 in the datasheet summary but the drawing at the end of the datasheet shows the actual packaging.
Anyway on the genuine Infineon logo there is an "i" and the dot of the "i" can be a solid circle or a just a circle, but that one seems to have a "V" or a check mark instead of an "i", maybe it's some Chinese character, it must be in the top 10 of the worst fakes 🤦♂
There are a lot TO-220 variants and Infineon uses at least 14 for 3-pin components:
PG-TO220-3-1
PG-TO220-3-31
PG-TO220-3-111
PG-TO220-3-123
PG-TO220-3-253
PG-TO220-3-312
PG-TO220-3-313
PG-TO220-3-317
PG-TO220-3-321
PG-TO220-3-322
PG-TO220-3-901
PG-TO220-3-904
PG-TO220-3-908
PG-TO220-3-909
They make or made the 6R199P at least in:
PG-TO220 FullPAK with part # IPA60R199CP
PG-TO220-3-1/TO220-3-2 with part # IPP60R199CP
PG-TO247-3 with part # IPW60R199CP
PG-TO262 with part # IPI60R199CP
PG-TO263 with part # IPB60R199CP
By the way PG means "Plastic Green" = plastic without halogens
The logo on the transistor is Infineon. The replacement was probably a fake, that only withstood the boosted voltage for a second. The logo on the fake one is deffinitely an attempt at imitating the original, but it can't be the same.
Thumbs up for the pyrotechnics effect !
Looks like an opportunity to crack open the package of blown devices to compare the die size. It is very interesting what you've got from aliexpress and how it matches with the old device. Especially since you have a microscope, it wouldn't be so hard to inspect the die size. Just heat the device as much as you can (500C or higher) and then plastic top comes off with ease.
My bet is that the replacement transistor was originally rated for significantly lower voltages or just could be a completely different type of transistor. That's why it lets the smoke out.
I have been done by Chinese Junk many times, including fake graphic cards. I think that is why it is called Ali Express - get rid of it as quick as possible to another victim.
@@sherlockholmes1121 I don't know why we keep buying this chinese crap! its useless, buy the original part from a reputable source and be done with it!
That’s what I was suspicious of. Buying from Ali Express for customer repairs seems like plying with fire in a dry evergreen forest. Things are bound to blow up. Ali Express is fine if you have made jigs to test components up to their ratings. I’ve got a couple PSUs I copied onto a less dense PCB and added sockets (expensive, sadly) to let me test parts in circuit and change them out easily. No fake mosfet lives long when loaded up properly at high line voltage :) In that respect I follow Mr.Carlson’s advice: functional tests are best. Just don’t do them in what you’re trying to fix.
I’m pretty sure the transistor is definitely a fake.
Fake components on aliexpress? Never! Seriously tho I'm always amazed by your faith in aliexpress components, seems to be your goto supplier. For other people its mouser, digikey hell even lcsc, then aliexpress as an absolute last resort(and by which time you know it's gonna be fake/reject/used/etc if you can't get it elsewhere)
Well it is difficult in the cannary islands....
27:10 I never thought that those rings/ beads are really that important. I thought that is it only for an additional safety reasons (not required for normal operation).
Thank you that you pointed it out - to never forget to apply those rings back to new transistor.
It may not be what caused it - just a possibility I thought i should mention. because no doubt others would if i didn't.
I think it is more likely fake replacement Mosfet
my OCD really wants you to troubleshoot and repair this, can't leave me hanging like this 🙂
Exciting stuff. Keep up the great work 😀👍
The transistor is surely a dodgy knock-off. Here're the evidences and clues:
1. the very top layer of plastic packaging with the original markings was simply grinded off. The original surface is expected to be very smooth almost like having a glaze coating due to the way the plastic case is manufactured.
2. the marking uses a different font type which looks like Arial MT. Every reputable manufacturer use its own custom font, not just a font type that most likely bundled with a typical MicroSoft Office software package.
3. the quality of the laser engraving itself and how deeper the etching was done. The edges and how the whole picture is done. Most likely you'll see a dot/pixel patterns/arrangements that would tell that the cheap hobby-grade laser engraver was used.
Also please be extra cautious. The exploded device package pieces that fly into the air are extremely dangerous as they always have razor sharp edges. Please take care.
Educational indeed. Failures during testing are very handy when trying to work these things out yourself in the home lab. Be interesting to get Louis Rossmann onto it and see if he can solve it for educational purposes. Good stuff.
Wow that was a strange failure, great watching you in slow motion made me think of a tagline 'O̶h̶h̶h̶h̶h̶h̶h̶h̶h̶h̶h̶ ̶F̶F̶F̶u̶u̶u̶u̶u̶u̶u̶u̶c̶c̶c̶k̶k̶k̶k̶k̶k̶ ' but I decided to keep it family friendly ! Yeah bring indutors into the equation and you create food for thought...cheers.
Great video, yes carry on with the PSU repair. I have a mackie SRM450 V2 amp that the PFC works when injecting 18V. But will not power up with mains voltage applied. repair in progress
Loving this channel Richard.
Try rubbing some acetone with a cotton swab over the printing on the suspect mosfet. If it starts coming off black it's a good indication that the original part number has been sanded off and it's been re-coated and relabeled as something different than it actually is (though some fake parts don't always swab black, so it's not a perfect test, but an awful lot will, and genuine parts never do).
I don’t think there’s any question the replacement mosfet was fake. It looks 100% wrong. Doesn’t even need to be repainted - the marking is just not right in any respect. Is screams cheap, and the original doesn’t.
Maybe not the best "repair" video but certainly an excellent instructional video. My money is on bogus MOSFET, in the slo-mo it looks like the MOSFET fails first followed by failures on the bottom of the board. Regards, David
Love your authentic style. Thank fk in this day and age we need it!!
Awesome stuff...thanks for sharing
Great video,thanks, your atlas analyser still has a low battery!
Great video series on this supply. I would love to see a conclusion?
Heya nice spark we don't see firework like that a lot lol
Most definitely lets fixit!!!! i wanna see if we can mod or fixit correctly
@ 18:00 I was shouting at the screen "it's 103 upside down!!!" 😆
i reckon that was fake transistor. wasnt insulated tab like the other, first give away but also look like all the other cheap regualtors and transistors they sell. always good fun fixing power supplies countless back to front caps. good video keep up the good work.
Better to get another power supply it looked like the Vias blew out along with the connections to and third layer in the board
12:19
Its seems the electrons dont like you or would go to bed an you didnt let it 🤣😳🤔.
Nice video 👍🍷
Hello sir, i love your videos im learning alot, am i wrong in saying the diode of the pfc is wrong way around?
good video , please buy a de- solder gun , i think that maybe you miss a high ear capacitor !
"Probably NOT The Best PSU Repair Video On UA-cam"... No, this is just a tribute. :) In all seriousness, I liked it, because it highlights that things WILL go wrong some times, and that some times there are cascading failures.
@ 12:22 ... Way 2 go... ROFL More like this...
The SPARKS R flying 2night...
& That's Y I always carry a spare pair of undies...
12:10 warning, here is the "jump scene" like in the horror movies ❤
Ha ha ,I do the same knowing deep down im not connected ,⚡😅
😳😳🤯🤣🤣
The Slowmo ROFL...
Hi. Would be helpful if you can help with power supply which standby voltage works but when connected to tester the lamp lights up as its shorting out. Cant find on your videos one of these. Maybe missing something. Got 2 psu here with exact same problem evga g2 850 and cougar 850. If possible any help would be appreciated
A video with this problem would be helpful 👍
New subs
You win some and you lose some. That's the nature of the business.
Yes, fix it. :-)
is that really called a PSU though ? I'm sure thats the main power delivery circuit
fix it when you get the other one to compare
Experiment on this one.
You know you have kill the video with the title ?
The slowest whooooaaah ever 😂😂 £25 seems jolly reasonable tbh. Especially for apple stuff.
For £25 it may not be Apple but rather crapple.
your awsome mi g