please I really need help and don't know what to do,I have this HP 15 laptop which the power MOSFET is really burnt on the motherboard and i can't replace another one at the burnt area,please what can i do to make my board work again? this is the board number DAU88MMB6A0 REV:A
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Re: Hp 15 with burnt mosfet
will most likely be more things burned . new board is easiest if its that bad as you say . -
Re: Hp 15 with burnt mosfet
i just did a razor laptop with a burnt bad mosfet. it burnt so bad that the char was creating a resistance to ground, which had a plane right under the + rail. i pulled up and scraped away what i could untell the resistance went away on the + rail. unfortunately it also took away the traces to the battery monitoring chip which controlled the mosfets. i had to run a wire to them. i used a lifed trace and some wire to place a new mosfet.Attached FilesLast edited by IDislikemakingLogins; 04-05-2017, 06:52 PM.Comment
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I tried to use this method:
Testing an N-channel MOSFET:
Step 1: Discharge the Gate (turn off the MOSFET)
Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.
Step 2: Charge the Gate (turn on the MOSFET)
Now, place the red probe on the Gate (G) and the black probe on the...09-27-2024, 03:31 AM -
Hello everyone, I recently found this badcaps site and super Learn Electronics Repair youtube channel. And I wanted to learn how to troubleshoot power supplies and VGA cards and how to practice soldering, since I already have a properly defective piece of them. I am currently trying to solve two problems:
I have a Gigabyte GV-RX460WF2OC-4GD type card. I managed to find the faulty MOSfet (AON6414A) on it, which I replaced. The card starts up, but after about half a minute, the MOSfet in the same position will be shorted again. Is it possible that the PWM controller driving the MOSfet... -
So I have this Asus GT531GT whose pad is burnt and it shows short to ground 0.8 even after removing all the connected mosfets and capacitors.
Image attached . The mosfet where the pad is burnt is PQH8102... -
Hey guys,
i have a asus motherboard here and as the title says after the first mosfet (in the picture) there is nothing more than 3.15v.
I injected 19v and max. 1 amp at the charging port and there is not voltage drop or smth. It's just taking 19v and 1 milliamp.
Then i tried to inject 19v and max 1amp after the current sensor and there it first takes 19v and 4 milliamps and after 2 seconds it is taking nothing (no current).
I measured on the coils on board everything seems fine. Also the main power rail is not shorted (infinite resistance).
Now i thought something... -
The board number is GU502DU. I repaired this a couple weeks ago and it came back with the same issue, same mosfet failed (PQH9201). I'm hoping that the GPU was spared this time.
I used the same replacement part (purchased from Mouser) and I'm certain the soldering was done properly since it took just as much effort to remove as before. What could cause this same mosfet to fail? I'm thinking if it was unsuitable then the others would fail too. I looked for similar failures on YTube and the mosfet was replaced with AOE6930 in one instance and AOE6932 in the other but it's possible that the...
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