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Old 11-09-2021, 02:34 AM   #1
xxphgpxx
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Default Alienware la-d751p gpu or mosfet?

Quick disclaimer, I am nowhere near being able to fix any broken hardware or will I attempt to fix this myself. I just want to diagnose this as much as I can to see if it is even repairable (before i pay someone just to tell me itís not fixable).

This is an alienware 17 r4 i bought for spare parts like ssd, hdd, memory, wifi etc. the laptop does not turn on and the charger turns off (safety mode) as soon as itís plugged in to the laptop. (Short to ground?)

Opened the laptop and found the Current Sense Resistor has an excess solder, thinking someone has already attempted to inject voltage into this. This resistor beeps on the continuity mode.

Measurements.

Capacitor (positive side) to cpu vrm: 26ohms, 26ohms, 28ohms, 28ohms, 28ohms

Capacitor (positive side) to gpu vrm: 24ohms for all i believe

Ground to cpu vrms: 4ohms

Ground to gpu vrms: 0 ohms

2 mosfets circled in yellow are shorted and beeps with continuity and reads 0 ohms.

Could the mosfets be the culprit?
Ty
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Old 11-09-2021, 04:46 PM   #2
ktmmotocross
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Default Re: Alienware la-d751p gpu or mosfet?

inject 1V 10A+ and check what is heating
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Old 12-29-2021, 10:11 AM   #3
adamski1952
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Default Re: Alienware la-d751p gpu or mosfet?

Maybe i'm wrong but those look like bios chips to me.
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Old 12-29-2021, 02:33 PM   #4
ktmmotocross
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Default Re: Alienware la-d751p gpu or mosfet?

Quote:
Originally Posted by adamski1952 View Post
Maybe i'm wrong but those look like bios chips to me.
yes they are
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Old 12-31-2021, 09:27 AM   #5
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Default Re: Alienware la-d751p gpu or mosfet?

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Originally Posted by ktmmotocross View Post
yes they are
How did you test the mosfets were shorted?
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