Shorted high side mosfet = always a dead CPU or GPU Acer Nitro 5 AN515-55 not coming on or charging

[led-matrix-au]

A simpler method for identifying a shorted MOSFET without removing any component is to connect the coils to the ground. This will cause the faulty component to illuminate under a thermal camera, and it will also protect the CPU/GPU from excessive voltage because it will clamp it to ground. Just a tip.

[Oak]

Doesn't matter if you didn't fix it Sorin, still great tutorial video. Thank you!

[peterjensen]

Good morning, having my coffee and Sorins morning video is just the perfect start of my day.

[trainyourbrain]

Just had the same issue and on the same mosfet today. I actually plugged the power and saw the main power Moffett getting hot because of that little mosfet was shorted. I removed the little mosfet (same as you in the video), and the power actually went and powered the motherboard for a second only to stop right after. Again, under the thermal, the CPU was lighting up like Christmas. Defintly not worth repairing it. It's better to keep it for parts at this point

[mickyparker]

Sorin of I was 50 yrs younger I would love to learn the knowledge you have gathered and given to us. And I'm still learning at 70 because you can't stop learning as it is one of my big interests hobby wise. Thank you Sorin

[petejackson]

I think the manufacturers should do more to protect these bga ICs like cpu and gpu etc from high voltage or these ICs should have sockets.

[kanecrowe]

I’ve got the same kind of laptop, power just shut off all of a sudden and the screen went black, opted for a new power supply still nothing, thank you for this video. You’ve saved me many many hours of heartache

[danielbarcellos]

Eu estou com o mesmo defeito em um LA-K861P. Comprei mosfet novos no aliexpress AON 36352 e ficou no mesmo sintomas que este vídeo tutorial. Obrigado por sua experiência e explicação sobre este equipamento.

[hedpt]

It's ridiculous how manufacturers do laptops so powerfull but there's no safeties for this kind of scenario. As always, awesome video 👍

[tomaskas]

I had same laptop with same issue.. was driving me nuts… after I watched this video I was relieved.. thanks Sorin

[bobtruck]

My gaming laptop last 2 years and it blew a IC chip. Since it's a build in gpu, cost 1000$ to repair. I'm convinced.... NOT MORE GAMING LAPTOPS! Stick to desktops when you want power. And this guy says 80% of his repairs are laptop boards? Enough evidence that too much power in a tight enclosed case will ALWAYS lead to destruction. We don't see this in tower pc's.

[stevenszockson]

Hi Sorin, you are always good at this job

[OnStageLighting]

Hardest part of these cases is giving up. You feel that maybe one more look/test will find something that can be repaired, make the customer happy and get paid full fee!

[optimizelogicrepair]

I just No-fixed an ACER Predator Helios 300 (Same motherboard shown in the video) with the same exact fault. I started by removing the two input MOSFETS and the 2 resistors. I Injected 1V/3A on left PAD of current sense resistors and found the shorted CPU MOSFET to be the one on the Far right. After removing it the short on the +19V input went away, but sadly measuring 0.3 Ohms to GND on the 4 CPU VCORE phases... :( RIP CPU. The MOSFET at position PQB11 was also shorted. When I looked in the barrel of the charger plug, there were scorch marks, and the charger was not outputting 19V. My guess the charger (aftermarket) may have been the fault.

[JazzEnso]

Hi sorin little bit advice I'm watching always your video, if you remove a upper mosfet or high side mosfet don't plug in a charger without new mosfet, because the source of the upper mosfet is 19v, so they chance to wild that area because no mosfet detected by vcore ic, and is possible the lower mosfet will switch the ground in the cpu inductor

[nolastionut]

I wish I could still be in uk to send you my alienware r5, I'm pretty sure you could fix my rgb lights as they are not working at all and it's not a single case, great videos by the way!

[giorgostexnikos]

nice morning sorin with coffe and a lesson for you.thanks

[aqwa]

Careful when heating near those aluminium capacitors... They can pop with little heat 😢

[westsenkovec]

I miss the good old times when Sorin didn't have a thermal camera and he would have to use his hand. It would sound something like this:
We have a proper nice laptop here. i7, separate graphics, SSD, proper nice. Let's connect it to the power supply. No, no, no.. I can't find anything that's getting hot. No... It can't be a faulty CPU. No.. It will be a sad day if it's a dead CPU because this is a nice laptop. *AJAJAAJAJAJAJAJ* this is mad hot! I burned my finger! It's a hot capacitor! The CPU is fine! 😃

Those videos were suspenseful and interesting until the last second 😂

[timothyburke]

The question is what caused the fault. The mosfet blowing the cpu or the cpu causing the most stressed mosfet to short? Up until the last couple of years it was never the cpu especially on desktop boards, now we are seeing a lot more dead cpu's.