820-3476 ppbus 1v

[No-Clean]

Board had very little liquid damage near J6100 so I removed it, other than that rest of the board is clean.

pp3v42 is 3.4v

U5110: 1 and 3 are 3.4v and pin 5 is 3.4v

ppbus is 1v and there is no green light

I went thru all the rails on page 100 and there are no shorts anywhere, Im thinking this could be a bad SMC

 

[2informaticos]

PPBUS_G3H should have 12.2V even without SMC.
Check resistance (ohm value) between pins 17/18 and 27/28 of U7100.
Post voltage for basic pins; 1, 2, 3, 9, 12, 13, 14, 15, 19, 20, 27.

 

[No-Clean]

17/18 3.8o and 27/28 20o I checked this first and saw it was fine and now you tell me that ppbus should be 12v then the problem should be the isl, I replaced it and done!

Thanks!

 

[No-Clean]

Well I spoke too soon, I get fan spin but no image/usb activity

New clean BIOS from forum before posting here

PPVCC_S0_CPU 1.7v
PLT_RESET_L is 3.4

 

[2informaticos]

Check all (more than 20) SPI Bus Series Termination resistors and their traces.