Toshiba Satellite not have +5v and +12v

nyn1979

Commendable
Jan 10, 2017
2
0
1,510
Hi guys,
I have a Toshiba satellite L50D-B-15 k to a friend who does not work.
When I press the power button start for 30 seconds, the screen stays black and then turns off.
My post card says:
signal error check the pcu and power box. The power voltage work for 3.3v but not have signal to +5v and +12v.
I tested with a multimeter the PSU external and it works correctly.
I don't know what to do and what to think.:??::??:
Thanks for listening.