packard bell tm85 easynote , well random shutdown

[highpulse]

we've cheked that fan is always on , after some schematic cheking , we tough could be bad me region on bios , replaced bios , but the same issue .
Replaced HM55 with a new one , doing same thing
replaced KBC , D3 the same
simple stupid computers have this anormality of random shutdown .
any ideas ?

btw this board is the same as aspire 5742zg

la5891p
rev 1.0

if anyone have an idea of what the problem is or had this problem before and solved i apreciate the feedback

[magneh]

Re: packard bell tm85 easynote , well random shutdown

we've cheked that fan is always on , after some schematic cheking , we tough could be bad me region on bios , replaced bios , but the same issue .
Replaced HM55 with a new one , doing same thing
replaced KBC , D3 the same
simple stupid computers have this anormality of random shutdown .
any ideas ?

btw this board is the same as aspire 5742zg

la5891p
rev 1.0

if anyone have an idea of what the problem is or had this problem before and solved i apreciate the feedback

Hello!
Seems to be a cold joint...
could you monitor the Vcore with Oscillo?

If that's not that, maybe a problem on thermal sensoring circuit.
Try checking the responsible diodes that deliver signal maybe...

If you notice some oscillation on Vcore, try reflowinfg the PWR chip (ADP ...)

Good luck!

[highpulse]

Re: packard bell tm85 easynote , well random shutdown

well since i dont have osciloscope yet , i reforced all solder on main power lines , and cpu core , including all mosfets , all coils , all caps , (main ones) even replaced the ADP cpu core IC , the things i notice , having 2 board here one working well and this abnormal one , is that this random board , fan is always on , usually start working , then stops working then start working once it needs , but here its always on ..
its now testing after adp change , fan always on and never stoped , (not starting good) but didnt disconnect yet , lets see how long it hangs