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... -
I have a Razer laptop (RZ09 MB# CH570_MB_NT) that has a shorted mosfet marked BND M03 E067 that I'm unable to find anywhere online. Does anyone either know what the part number is for this mosfet or have a schematic I can find it in?
Backstory on the whole thing the laptop was plugged into a lamp at a hotel. The lamp got unplugged while it was charging and now the system won't power on anymore. I found the caps around this mosfet shorted and when I injected voltage into the caps the mosfet got hot and my bench psu was pulling 5A. Pretty sure this is all that's wrong with the laptop... -
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...
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