820-2936-b efi bios chip replace

[opethfan]

hi, i have a macbook that requires efi pin password.

so i do these actions:

- desolder old efi chip (u6100)
- solder a new one

now when i power on the white led blink and it power off after one second

- so i put the old efi chip but now i have the same result

what i'm doing wrong?

[rookieme]

Re: 820-2936-b efi bios chip replace

Any chance you put it wrong direction?

[dellxps15]

Re: 820-2936-b efi bios chip replace

do fan spin for some times or just spin a bit and immediately shut down?

without bios does it stay on ?

looks like same problem i have with a macbook pro.

[opethfan]

Re: 820-2936-b efi bios chip replace

do fan spin for some times or just spin a bit and immediately shut down?

without bios does it stay on ?

looks like same problem i have with a macbook pro.

yes, fan spins for 3 seconds and then stops

[dellxps15]

Re: 820-2936-b efi bios chip replace

that aint great soldering. use hot air for desolder that kind of ocmponent and use good flux. plus clean whole part with ipa.

so without bios it stay on for 3 seconds only ?

[opethfan]

Re: 820-2936-b efi bios chip replace

no, it won't stay on also without bios, but i found c6603 burnt...
i hope that it is the problem...

[opethfan]

Re: 820-2936-b efi bios chip replace

replaced c6603 but same result...

@dellxps15 i'm from italy too, can i send it to you?

[dellxps15]

Re: 820-2936-b efi bios chip replace

macbook received and fixed

have to check if efi password is removed, but should be fine. (put anothe rbios chip on it), but unfortunately one macbook hard drive i had is dead....