macbook pro 13 inch a1278 820-2879 Bios dump

[dellxps15]

hi, i need this bios dump for a macbook pro 13 inch that doesnt power on at all. tryed another bios and fan spin but no display and since there was not reported the mainboard code but only model, i need specifically a bios dump for 820-2879 with that mainboard layout.

[polytek]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

i don't knew if it's the same but this is for A1278 820-2879-B

[dellxps15]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

tnx really appreciate. will try them tomorrow.

ive seen with first bios ( wrong as it was 8mb and it's a 32bit bios) macbook power on with a downloaded 4mb pc is dead

[Comrad_SU]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

i don't knew if it's the same but this is for A1278 820-2879-B

Thank You! It's working, but i can't enter to BIOS. No one combination incorrect.
P.S. Sorry for my english.

[dellxps15]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

update about that macbook:

with bios on it pc power on then off almost immediately. if i remove bios chip, pc stay on with no post, but at least is running. if i put back bios in it it is doing the same all the time...

[ala_borbe]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

maybe try here

https://ghostlyhaks.com/downloads/efi-repository

[dellxps15]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

but ive used dump posted upside and still do the same. when using a dump i hould not have any password right ?

[highpulse]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

dell if with bios attached still not turning on , there is no good communication between smc and bios . do you have osciloscope ?

[dellxps15]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

i dont :S and smc is totally reballed....

[highpulse]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

dell beeing reballed doesn't mean that its ok

[dellxps15]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

i know.... when pc is powered off and bios chip is removed i have volt 3.3 on pins 1-3-8

if i power it on also without bios chip i have voltage on pins 1-3-7-8.

[highpulse]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

3 7 and8 are 3.3 vcc lines so that ok , pin 1 2 5 6 are command pins TX RX , does are the one you need to test . but does only with osciloscope , or try something like replacing bios chip and insert new rom

[highpulse]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

a1278 mcp89

bios

vinafix downloaded

[dellxps15]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

let's try this bios too.... tnx

ps: once i flashed for bad reading a 8mb bios into 4mb rom and even if bios was soldered , pc power on and fan stays on (ofcourse no post)

edit: with this bios dump it does the same..... with soldered bios i have volt on pins 1-3-8 when power off. when i press power on (smc bypass) i have stable volt on pins 1-3-8. pin 7 goes for a fraction of second up to 3volt then 0.

[highpulse]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

chek pin 7 on schematic , to see if its normal to drop to 0 volts

[dellxps15]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

when bios is present it drop, otherwise it didnt.

looks like it's related to gpu..... maybe gpu need new bga instead of just a reballing. for now ive removed smc and will put another one just to be sure it's not an smc problem.


any good source for mcp89-mz-a2 seller that sell new bga ?

gc didnt have any new but just second hand.

[Saidogoid]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

Thank you polytek for the dump.

Mine was chimming and giving white screen, but he dont recognize hard drive and won't give ALT options.

I programmed the bios and do the SMC reset and NVRAM and that solved my problem.

Many thanks,

Regards

[charly22patricio]

Re: macbook pro 13 inch a1278 820-2879 Bios dump

Many thanks