Hi! An urgent help is needed for Toshiba A205-S5825 regular shut down issue.
Platform : ISKAA LA-3481P Rev : 2A

Steps already taken :

1-cleaned fan system (was a little dusty but not clogged), removed dried paste and applied new one to CPU and GPU.

2-Tried naked mobo with a working ram, CPU, KB and Lcd display, enter bios screen, lap always shut down after about 1'50s.

3- Scanned mobo with an infra-red thermometer, Max temperature registred 42° at SB, so no heat issue.

4- Checked Thermal Sensor ADM1032ARM :
VDD : 3Vs
D+ 2.38V
D- 0v
EC_SMB_CK2 and _DA2 : 5.6V each
pin 4 "Therm#" and 6 "Alert#" not connected.

Please note that CPU of A205-S5825 series doesn't use big "Nec-Tokin cap" but 330uf small caps.

Also Tried with Mobo +ram +fan but without CPU it also shut down at about same time.

Has any one dealt with the same issue, or any clue as where to dig further

Thank you

This is the 4th day since I posted, and no suggestion from colleagues seems to be coming !!!

Has no one encountered the same issue ?

I'll be waiting for any help, hope not to be disappointed.

Bios ?