Acer Aspire 5532 Laptop running a 1.6 GHz Athlon TF20xxx processor.
Problem cropped up a few weeks ago. Turn on laptop and If you run the BIOS SETUP and leave it there, it shuts down. Won't even get to the Windows 7 login or splash screen.
Opened up the laptop and ran it with just the motherboard on the bench and Bezel with power switch and external monitor. No hard drive, no DVD-ROM drive, no peripherals hooked up. Just power, power switch and external monitor.
Did this to observe if the fan or peripherals were causing the system to shut down.
Fan will run for a few seconds then shuts down. Monitor then goes blank within a couple of seconds, no display, no cursor, basically no signal.
Checked the heatsink and reapplied heatsink compound.
Checked CPU fan, spins freely, runs momentarily then stops. No dust in radiator or fan shroud.
Replaced processor and RAM.
Tried running a Linux boot disk but could not boot due to system shutting down after BIOS start up.
Seems to be a heating issue. Fan runs but stops (seems to be the reason). Replacement CPU has no effect. Replacement RAM has no effect.
Question: Is the fan supposed to stop on boot up?
If not I can see why the system would shut itself down. I've Googled this problem and some techs say this is normal. One hobbyist even went as far as replacing the cooling fan itself with the same result: Fan shuts down after 5-seconds of powering up the Mobo.
If the fan is SUPPOSED TO shut down after a few seconds the answer is that it will turn on when the CPU's sensor indicates a higher than normal operating temperature. But after a few minutes after shutting down, the motherboard refuses to power back up or display anything on the monitor. Basically it's not turning back on.
I'm suspecting if the fan is operating normally and the CPU and RAM is fine could I be looking at a bad motherboard, specifically bad capacitors?
Sorry for the long diagnosis but I've spent an entire day troubleshooting this laptop and am starting to believe the mobo is the problem and not the CPU Fan.
Anyone had a similar situation and what was your solution? I'm stuck and ready to consider replacing the entire motherboard or e-recycling the whole thing.