Question Toshiba Satellite C660-1M blackscreen shutdown fast fan

Aug 25, 2019
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Yo guys

So ive replaced a faulty mobo which had a power problem on my c660 which wasnt even powering on.

After replacement When i power it on with the battery it boots with no display not even backlight. After around 20 to 30 sec the fan spins maximum for around 3 seconds and it shuts down. When i remove battery and run with power instead of shutdown it restarts and repeats. Ive tried booting without Ram and diff Ram slot no diff. Ive removed cmos battery and tried booting and no diff. Ive changed cmos still no diff.
Even with external monitor no diff.

Any help will be appreciated

Heres a video of it

Toshiba c660 shutdown blackscreen.
 

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