(347) 552-2258 help@rossmanngroup.com

820-2796 Kernel panic

tlough75

tlough75

Member
On the bench I have an 820-2796 that had an EFI lock on it. I desoldered the EFI IC, soldered it to a little breakout board and backed up the BIOS then removed the EFI lock. Before I did this the laptop did not kernel panic and now it does randomly, and after every time I shut down after it restarts it says "your computer restrted because of a problem". I realise I did something to the BIOS or the IC so my question is, should I dump the original back onto the board, or shold I replaced the IC? I imagine I may have heated it too much or something because it was working fine apart from the EFI before. I am currently buying one of those clips so I do not have to remove the IC in the future. I ususally use my Medusa 3 but this LB is from 2010 so it is out of the range for the Medusa 3.
 
2informaticos

2informaticos

Administrator
Staff member
Desolder/resolder SPI chip with hot air should not be the reason.
I always did this on 2010/11 boards without problems.
But depends on your hot air station settings too.

You must discard BIOS mod reflashing backup.
 
S

SMMRepair

Member
I don't think it's the case in this situation, but you CAN overheat the SPI chip with hot air. This is VERY EASY to do with the Micron N- chips! They will die/damage very easily if you apply too much heat too directly. Usually it just damages/corrupts the BIOS dump itself, but you might see the erase/write process fail, or no chip detected, etc. But yes Micron chips suck. The Macronix and Winbond chips are much, much more resilient to heat. I do not know why, but I have killed several Micron chips even when being extremely careful with the hot air. Your issue sounds different, but honestly I wouldn't be surprised if the chip is damaged, IF it's a Micron chip.
 
tlough75

tlough75

Member
I don't think I overheated it, and the BIOS wrote back to the chip without errors. I used a soldering IRON to put it back on the LB. I have one of those clips that clamps over the legs so I do not have to take it off the board again but I need to build a header or something for the other end to plug into programmer. I think I may first put original dump back on, check to see if it KP, then if not my altered file might be bad. if not, then I think it is safe to assume I need a replacement EFI...
 
You must log in or register to reply here.
Top