820-3023 U6100 Help

[rob777]

Hey guys, bought myself another laptop to try and repair. Board doesn't chime, found some corrosion around u6100.
Have my important power rails and have green/orange light on charger.
Removed u6100, pads still ok put it back on as have nothing to change it with.
Same readings before hand and after putting back on.
Pin 1 3.3v
Pin 2 3.3v
Pin 3 3.3v
Pin 4 Ground
Pin 5 0v
Pin 6 0v
Pin 7 3.3v
Pin 8 3.3v

So pin 5 does not have SPI_MLB_MOSI coming in and neither is pin 6 getting its SPI_MLB_CLK

Also probe point XDP_PCH_PWRBTN_L is completely corroded away.

I get no readings either side of r5122, r5127, r5112, I was assuming if I traced it back the problem component would show itself so does this mean U1800 is dead because I can't get SPI_MOSI_R?

Care to share some pointers for next steps?

THANKING YOU!

 

[dukefawks]

You cannot just measure these voltages, they are high speed signals and a multimeter is useless.
Common is that the resistors in series with the data lines are corroded or a trace. Remove U6100 and check on diode mode pins 1,2,5,6 on the board. They all should read something, if not check the resistors/traces to U1800.

 

[rob777]

Thanks again for putting up with me and trying to help out. Appreciation to the max!

In diode mode
Pin 1 05.73
Pin 2 05.70
Pin 5 05.70
Pin 6 05.70