Board was powering up intermittent with black screen (chime) so replaced U7701 and Backlight was ok so began installation of Os.
After reboot it wouldnt turn on again so found some corrosion around Y1915. Replaced both resistors and board still powering intermittent.
Board stopped turning on the only drawing 250ma black screen no chime but usb boot hdd has activity (Blink a couple of times).
All rails have correct voltages except for backlight (PPVIN_S0SW_LCDBKLT_FET) .
PPbus has 8.58v
U1950 PM_PCH_SYS_PWROK 3.43v
Reflowed SMC then reballed but still same.
Any point in relacing Smc or what am I missing?.
After reboot it wouldnt turn on again so found some corrosion around Y1915. Replaced both resistors and board still powering intermittent.
Board stopped turning on the only drawing 250ma black screen no chime but usb boot hdd has activity (Blink a couple of times).
All rails have correct voltages except for backlight (PPVIN_S0SW_LCDBKLT_FET) .
PPbus has 8.58v
U1950 PM_PCH_SYS_PWROK 3.43v
Reflowed SMC then reballed but still same.
Any point in relacing Smc or what am I missing?.