820-3115-b board dont boot white led

turbo

Member
820-3115-b board, had slight water damage, all cleaned good now , now its turns on ...does not boot, white led keep on ,


cpu vcore good,


any idea , where to look

pls chk picture
 

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Alan.L

Member
remove the BIL to see if still turns on. any image on screen, shine light to screen?
also SMC_LID value?
 

2informaticos

Administrator
Staff member
No drop at VCORE, board is not functional; no need to check USB mouse.
Check around SPI chip, for corroded resistors, traces.
Don't forget R7403...
 

turbo

Member
usb mouse=no light ,

cpu vcore 1.12v,

aux cpu vcore....=0......


both ton register good, R7403 etc
 

SMMRepair

Member
Just for testing, swap the BIOS/SPI ROM chip from another 3115 onto this board. If it chimes, you have either bad BIOS or dead/faulty chip.

If you DO get a chime/boot, then load up a new BIOS with the original/correct serial number, MLB and a clean ME region. PRAM on 1st start.

If you DON'T get a chime/boot, then you can eliminate BIOS/SPI ROM chip as the cause, and replace the original chip back on the board.
 

ALB-Repairs

New member
Try ram slots one by one, Reseat Ram.ect

You have high v-core. It can be:
Ram not so good
SPI ROM
And often can be caused by a bad SMC.
 

turbo

Member
Just for testing, swap the BIOS/SPI ROM chip from another 3115 onto this board. If it chimes, you have either bad BIOS or dead/faulty chip.

If you DO get a chime/boot, then load up a new BIOS with the original/correct serial number, MLB and a clean ME region. PRAM on 1st start.

If you DON'T get a chime/boot, then you can eliminate BIOS/SPI ROM chip as the cause, and replace the original chip back on the board.
did that , no boot/chime
 

turbo

Member
No Title

here im posting some original water damage pic . b4 cleaning ....... pls chk the pic and let , know, i took out and thunderbolt chip and those is, those are good, also i put it back,

fan spinning high speed no, boot... which region i should chk first...spi chnged still the same, ......


cpu vcore good, 1.12v....

aux vcore 0v
 

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