820-3435 board fan spin all rail there , no external disply or turn on

[turbo]

got this mac air with 820-3435 board , fan spin , all power rail is there, cpu voltage is there, it might have slight liquid damage, copper round pad are slight discolour, all rail have power, PPVRTC_G3H there,

only missing power rail is l3095, and L7701, cpu turn hot, , All_pwr is good, any idea what is wrong ?

 

[2informaticos]

Try new BIOS first.
PLT_RESET_L and BUF_PLT_RST_L both present?
Do you get USB activity?

 

[turbo]

Try new BIOS first.
PLT_RESET_L and BUF_PLT_RST_L both present?
Do you get USB activity?

both present, , when i connect or turn on board usb blink once , bios is u6100 right ? i tried with a 3437 board bios no luck,


also i notice, Y1915 PCH_CLK24M_XTALIN, and CH_CLK24M_XTALOUT ohave .374v ... are those Volt correct?