Acer Aspire 5742 Boot loop (restarting)

[kandyan]

Hey guys, recently my friend brought me this laptop which shows common problem of restarting it self.Here are the specifications of the laptop and nature of its behavior.

Model: Acer Aspire 5742
MB Model: LA-6582P



Signs:

when its plug into a adapter 3.3v and 5v are up and after pressed power button power up the notebook with lights with the initial fan spin.
thereafter within 5 or 6 secs its restarting again automatically. no post screen and nothing. ended up with a boot loop.
no sign of heating chips, no wired noises, no shorted caps, no defected mosfets (no shorted ones but i am not sure about open mosfets).
I hv gone through the entire mobo and i hvnt found anything.

Guys plz guide me to some point which i start to looking at this problem.

[dellxps15]

Re: Acer Aspire 5742 Boot loop (restarting)

integrated vga ?
when power on, check all major voltage coil

[zaheer]

Re: Acer Aspire 5742 Boot loop (restarting)

all coil voltage parfect and my mechine after five minuts shut off i change hm55 its short after change come display

[Th3_uN1Qu3]

Re: Acer Aspire 5742 Boot loop (restarting)

Try reflashing BIOS first. If it still doesn't work, change chipset as mentioned above.

[spleenharvester]

Re: Acer Aspire 5742 Boot loop (restarting)

Is there a HDD plugged in? I worked on one of these last year, presumed it would be a board failure, it was actually a faulty HDD causing the boot loops.

[Ishop.tech]

Re: Acer Aspire 5742 Boot loop (restarting)

Hello guys I had the same problem. How did you resolve it?

[RJARRRPCGP]

Re: Acer Aspire 5742 Boot loop (restarting)

Sounds a lot like it's just power cycling, as if there's a bad solder joint or some weird protection circuit making it shut down and retry over and over again, like snow or ice on power lines or the like...

[bachir2004]

Re: Acer Aspire 5742 Boot loop (restarting)

i had once one with same problem, changed the two capacitors in the 3.3 and 5v and it was ok.