Expensive Gigabyte Aero Laptop Repair Nightmare. Thermal Paste killed it.

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[lordjohnpp]

I don't know if I'm the only one that saw that, but you have solder the OLD MOSFET instead of the replacement one. 13:24 it is visible that the MOSFETs are all the same. and on 18:30 you have put the replacement MOSFET for the first time 😀

[frank]

Its not the thermal paste that killed the laptop. My theory is, he sent the laptop to another repair shop before, that's why there's a missing component right next to the broken one. He just made a story with the thermal paste so he can send the laptop to you.

[rodneyknaap]

Possibly the CPU heating up really quickly in the thermal test is also a sign that it somehow received too much current from the mosfet which has killed it already before you received it, so there's nothing you could do. By coincidence I also decided to fast since yesterday. Fasting is super healthy, and everything you mentioned is 100% correct, it's great to hear your comments about this, and more people should do it.

[windowsxpprofessional]

Shorted mosfet sent 19 volts straight to cpu. Rip

[Pieterpk]

My theory of what happened: The resistor that was knocked off was the gate resistor of the high-side mosfet of this buck converter. By removing this resistor, the gate of that mosfet could have been open or closed (it is floating at this point, maintaining its open/closed state), in this case most likely open. When the low-side mosfet (in the same dual mosfet IC) was closed, it shorted VCC to GND through both mosfets. In this process, the low-side mosfet likely burnt open and the high-side mosfet let VCC flow directly into the CPU, which explains the high-side mosfet as well as the CPU getting hot like the thermal camera revealed. The CPU is designed to run on something around 1V, so the likely around 19V VCC ending up on the CPU has killed it straight away. So all damage was caused by knocking off this resistor and then powering the laptop.

[reggiedixon]

I wonder if he didn't disconnect the battery and shorted components? I was once careless changing laptop ram on a lenovo that has a metal shield over the ram assembly and I accidentally shorted nearby caps. Amazingly luckily I didn't cause terminal damage but easily done. Lesson learned.

[icr]

Good job as always, Im pretty sure this laptop is a gigabyte aorus 15 not Asus Tuf. ramadan mubarak.

[DiJAndy]

My guess is customer did not unplug battery connector, while replacing thermal paste and shorted something by accident. That cause damage to dual channel mosfet

[Dohcoms]

Thanks Alex, If the charger does not go into safemode @ 18:00 then that's the culprit, Excellent craftsmanship and fast work, And the cap didn't blow up in your face, LOL, Keep it up!

[cah]

Not that I have a schematic for it or any proof, but I can't help but wonder if that knocked off resistor had something to do with the feedback for that phase, and that if the laptop was powered up with it missing, then that caused it to go wonky, kill the MOSFET, and the CPU.

[tajamalhusain]

I want to learn your skills
Master class 😊

[Firestorm]

I have to admit, I've very curious what kind of thermal paste they were using, I've not really seen the non-conductive kind of thermal past be pink colored.

[lyricaljudge]

Asalam aleykum from the UK brother Hussain. Love your content ..

[gaineredison]

That's why we charge a bench fee.

[robertoruiz]

GOOD VIDEO ALEX, i like it when you put out video's even though you are NOT successful in the repair.Today i learned to look for missing parts, look for burned parts.I like to practice with 30 year old laptops i got when volunteering at a computer club that repaired them for POOR poeple.i have about 30 old junkers, at that time they didn't recycle them they went to the dump.Ya i know all the fish die and the landfill will never grow another tree for 1000 years.haha Anyways please keep putting out the video's where you aren't successful because to me they are as valuable as the ones where you do succeed.thanks from the bay area.

[ralphj]

Guesswork on my part, I wonder whether the floating mosfet gate (resistor knocked off during heat pad change) put paid to this one. Some mosfets are being produced with very low gate charge voltages / currents, susceptible to surges / spikes on the other pins.

[yummy_blueberry]

Happy Ramadan, I'm also fasting. Alhamdolillah I nevery miss any. Love from Pakistan.

[laidman]

Nice that you shared that you're fasting for Ramadan.

[kthwkr]

Our mechanical engineers did a study of thermal paste. The factory's application of white silicon thermal paste was getting all over. It didn't hurt anything but it was messy. How much paste is actually necessary? The subject was a power amplifier chip used in car radios. They found that if the paste was gently wiped off the surfaces leaving only a haze of paste the thermal characteristics were just as good as a thick glob of paste. And they tested no paste at all and it was not good. But a thin film was all that was needed. Now the question is how do we get production line workers to apply a thin film and not apply too little? They eventually changed to silicon thermal conductive pads. Way more expensive but worked just fine and not messy.

[Gaety]

Mi dispiace molto che tu non sia riuscito a riparare il pc, vedo nei tuoi occhi tutto il dispiacere ma sono cose che possono capitare.Sei comunque il migliore in assoluto.