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The board starts, however, after 30 seconds shutdown.
I Already check all the rails and the bad one i guess is PP5V S0.
PP5V S0 - 4.0V and sometimes 3.9V
" The board starts, however, after 30 seconds shutdown "
I still don't know if by "start" you mean it chimes and displays a picture. Was this thing touched before it got to you?