acer 5734z freezes at acer logo

[Ova Nadal]

Hi everyone, I bought an used Acer 5734z that freezes on Acer logo. I changed ram, cpu, power charger,......everthing. I removed cd rom, hdd, wifi and nothing happened.
Everytime it turns on, i tried to access to bios pressing F2 and itfreezes again.............I turn it on and I press Esc key and shows bios post and freezes again!!!......I decided to upgrade bios.......but when it starts the bios flashing process (obviously pressing fn+Esc before plug the power charger and turn it on) the notebook turns off and I cant turn on if i dont unplug the power charger.
Suggestions? I tried using the latest bios, the first one, all software includded, only the .fd file.......is all the same......it turns off!!!

 

[BradtheRad]

I cant turn on if i dont unplug the power charger.

Do you mean that the computer does something different when you run it on battery power only?

 

[Ova Nadal]

not exactly, what i mean is that when it turns off by itself, i have to unplug the psu to turn it on again.
Now I found something interesting!!!
Trying to recovery the bios flash memory with an old 4gb mp3 player as a pendrive, The laptop turn on with the fan cooler running at full speed. And it turns off too!! but 5 minutes later. Then I turn it on again (unplugging the psu and re pluggin) but the bios (1.01) is the same old version. I've tried 1.02, 1.05 and 1.06 versions.

 

[D.A.(Tony)Stewart]

Vacuum dust yet?
inspect heatsink?
Reset BIOS yet? reduce FSB?
Try MEMTEST86+ on a burned CD to boot from or any live Linux yet?

Perhaps aging latent fault, means end of the road.

 

[Ova Nadal]

no dust, everthing is clean, heatsink works fine, cant reset bios, cant access to bios, cant boot memtest, cant boot anithing.......stucks on acer logo. before detect hard disk and cd rom...........even if u remove it hdd or/and cd rom

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i'm going to find another same version of 5734z acer. just to remove bios chip and re soldering the new one. Did i mentioned that i'm electronic level technician?

 

[BradtheRad]

The laptop turn on with the fan cooler running at full speed.

Maybe this happens for a heat-related reason? A short-circuit? Or too much current flowing, to cause a drop in power supply voltage? Such things do not always cause a total shutdown, but maybe a system hang.

 

[D.A.(Tony)Stewart]

no dust, everthing is clean, heatsink works fine, cant reset bios, cant access to bios, cant boot memtest, cant boot anithing.......stucks on acer logo. before detect hard disk and cd rom...........even if u remove it hdd or/and cd rom

- - - Updated - - -

i'm going to find another same version of 5734z acer. just to remove bios chip and re soldering the new one. Did i mentioned that i'm electronic level technician?

even with 5 minutes over cooler?
Does POST pass? hit ESC or go to BIOS

if Post fails then isolate problem by removing RAM , 1 at a time, press on MOBO parts gently to check bad solder joints.

LOGO is a bios option often defeated with ESC.

 

[peter_england]

hello have solved your problem ?? if not then try this one check with keyboard and touch-pad connector removed if it pass post then your keyboard is faulty.