3437-B Vcore no boot

Mamdouh

Member
I have a 820-3437-B that has 1.7v on Vcore u6100 is missing spi_mlb_clk when u6100 is off the board i get that signal all spi resistors look good no shorts found on chip lines
 

2informaticos

Administrator
Staff member
"when u6100 is off the board"
Did you really test the board without BIOS chip???
What do you expect to find?

When PCH takes access to BIOS, some pins go down to 0V (as normal).
If you really want to see what happens there, need an o-scope.

Try known good working BIOS file, clean ME.
 

2informaticos

Administrator
Staff member
Heat BGA chips with quality flux; try to "burn" eventually accumulated crap.
Better to reball SMC.

Inspect board for broken traces, or knocked off components.
UC can cause this, especially if no sweep funcion available.
 
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