Dead Bay Trail SOC? Compal la-b481p

[luke10050]

hey, i have a 15" inspiron with a bay trail SoC. it seems like the soc is bad as even in an S5 state the SoC gets extremely hot. i have 5VALW present and 3VALW, noticed the RTC circuit was shorted too and it seems to only go to the SoC (RTC not populated on this PCB). i do also get 1.35V for the dram if i press the power button. but no SoC_VCC

Just curious if anyone's seen bay trail SoC's die. if it were working correctly i'd at least expect it to keep cool when its not on.

edit: i should clarify the SoC gets EXTREMELY hot even in an s5 state. all voltages appear normal however i was not getting any signs of life with the RTC circuit connected (RTC circuit pulling 3VLP down to about 1v).

[shovenose]

Re: Dead Bay Trail SOC? Compal la-b481p

I have NEVER seen any bad Intel SOCs in the past few years. Not to say it can't happen, though.

[kc8adu]

Re: Dead Bay Trail SOC? Compal la-b481p

saw 1 that took lightning through the lan.it was a industrial sbc.

[luke10050]

Re: Dead Bay Trail SOC? Compal la-b481p

This laptop has been pretty abused, no liquid damage, though practically every port is mangled beyond recognition, none of them are shorted iirc, probably should check better. Just trying to fix it in my spare time

My thought was the same, i've never seen Intel silicon fail, this is just behaving odd. Something did let a bit of smoke out once the 3v rail was connected, had a bit of a look but could not find any particularly ruined passive components. I'll probably just go around and look for weird behaviour. I've noticed already I don't have 0.65v but i"'m not sure if that's generated at the same time as the 1.35v for dram.

All the s5 voltages are there minus rtc voltage (dead short, can't find anywhere it goes bar CPU.) And I don't have a board view file for this board. Just seems weird, I'll get there eventually or give up on the cheap board I guess.

[luke10050]

Re: Dead Bay Trail SOC? Compal la-b481p

okay, so i had a bit of a look, VR_ON (enables SoC VCC) is pulled low, seems to come from the embedded controller. however DDR_PWROK is at +1.35V, not sure what the go is to be honest. as i get DDR_PWROK but no VR_ON and no obvious damage on the PCB