Toshiba Satellite C855-27U dead

[prospa]

Hello.
I have problem with a toshiba C855-27U. Motherboard model is PLF/PLR/CSF/CSR DSC MB REV:2.1 (H000052630 WK1327) (7C050790814B).

MOTHERBOARD is full led and after some second close without anything in screen (black screen). i have rework both chip vga and PCH .tried already CPU+ram + reset + bios program nothing. laptop has no screen.
i notice that a power chip TPS51225C is very hot so i have ordered and i change it but still the same behaviour.this chip is near in PCH near to JP8101 also.

I want to find SCHEMATICS but nothing.
Now i have a second laptop with exact the same behaviour. so its a standard problem.

Please help for schematic or any help....

[tiubxray]

Re: Toshiba Satellite C855-27U dead

Same as me, but my chip is tps51123 (Toshiba C640). And i'm not sure if i change the chip the board can be turn on. Right now the chip will heated up of i plug in the power adapter.

[pcbmaniac]

Re: Toshiba Satellite C855-27U dead

Καλησπέρα.

See if this is the diagram you look for.

[sparker1]

Re: Toshiba Satellite C855-27U dead

There is also this one.

[andalusi]

Re: Toshiba Satellite C855-27U dead

thanx

[im4m]

Re: Toshiba Satellite C855-27U dead

thanks

[Tefer]

Re: Toshiba Satellite C855-27U dead

I have the same problem, have you find a solution ?