Acer Aspire 4738g Sometimes it runs for 3-5 minutes and goes off automatically

Lele02

My Laptop Acer Aspire 4738g goes off automatically by itself.

When I turn on it, most of the time it runs for few seconds & goes off on Startup Window.

Sometimes it runs for 3-5 minutes, before I do something on settings it goes off again.

& Very rare time in a day it runs for upto 10 minutes & goes off after approximately 1 hours to 2 hours.

But Magical Moment is this that My Laptop Doesn't goes off in BIOS .

I left it on BIOS for 4 hours & it didn't gone off by itself.

I Tried these On both Plugged in & Battery.

I also removed my old Thermal paste from CPU & GPU . I applied HY810 Thermal paste all over the Area. My GPU temperature remains 47°C & CPU remains 45°C. (In Average).

So What Could be the Problem & Any Solution?

[Edited the thread to add model name and issue detail]

StevenGen

Have you changed the battery on this old laptop ever? As this laptops battery is not expensive and the Aspire 4738G is an old laptop and its battery doesn't last forever, change the battery first and if that doesn't work it could be the DC port or the laptops power circuitries that are either on their way out like a mosat or capacitor or there is a lose connection or a mobo trace that has come lose and causing these power outages.

Aspire 4738Gs battery 11V 5200mAh - 6 cell

These mosats in photo #1 are just after the DC port and caps that could be damaged, so check those too

This Capacitor is below on the bottom of the laptop an experienced tech has to tarce which cap or trace is faulty