Macbook Pro 13 2010 A1278 EMC:2351 wont power up

[kennethf]

Hello
Great forum
Iam working on a water damaged macbook pro 13 2010 A1278 EMC:2351.
The mac charges the battery and G3hot is good. But it wont start Great if someone could help me out where to look.

Thanks

[lord]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Well, I didn't yet worked on these newer macs, but i can see that you don't have 5V anywhere. Are there components on the other side of the board?
Try to measure resistances on the caps that have 0V.

[kennethf]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Well, I didn't yet worked on these newer macs, but i can see that you don't have 5V anywhere. Are there components on the other side of the board?
Try to measure resistances on the caps that have 0V.

Thanks I think you are spot on when you spotted that I dont have any 5V but I have problem to find out where the 5V supply is on the PCB.

[lord]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Did you measure what i told you in post #2?
Aldo measure voltages on all the coils. The coils next to a 3.3V coil is the 5V coil. Then check the mosfets near it.

[kennethf]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Did you measure what i told you in post #2?
Aldo measure voltages on all the coils. The coils next to a 3.3V coil is the 5V coil. Then check the mosfets near it.

I think I have found one of the problems, there is a chip (TPS51125) that makes 3.3V and 5V and this only produce the 3.3V. So I have ordered a new one and hope this will make the macbook happy

[lord]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

That chip doesn't make 3.3 nor 5 V. It can control the components that do.

Also are you sure that the chips output is 3.3V not the input?

[kennethf]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

That chip doesn't make 3.3 nor 5 V. It can control the components that do.

Also are you sure that the chips output is 3.3V not the input?

Iam not sure. Here is a schematic of this chip. I mesured (12.38V on VIN) and (3.3V on V02) and (0V on V01) is V01 the output of 5V?
I mesured (4.99V at VREG5)

[lord]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

https://cdn.badcaps-static.com/pdfs/...c3b552ae45.pdf

Here is the datasheet for your chip. VREG5 is the 5V output.

This is the explanation for the VO1 and VO2 (page 6):
Output connection to SMPS. These terminals work as fixed voltage inputs and output discharge inputs. VO1 and VO2 also work as 5 V and 3.3 V switch over return power input respectively.

[kennethf]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

This is tricky. I have taken some mesurements you guys can have a look at. Thanks for helping me

[kennethf]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Anybody have a clue were to look for errors?

[spatimouth]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

I had a MacBook Pro that wouldn't show any charging led or power on. I used a light prober on the board to see how far power was flowing through to the end of the board. Turned out power would stop at the charge board at a very specific small doohickey. Cleaned the thing very carefully and it now the laptop works perfectly.

So, my advise is to use a light prober and see which areas on the board are receiving power and go from there.

[MBVR6]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

At spatimouth

Do you still remember what spot/part that was.
Because i have the same macbook it also will not charge the battery.

All the fuses are good.

Any help and or advice is welcome

thanks in advance.

[spidey]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

5v will be there after swtiching on. first try flashing bios, then check EC.

[thodoris10]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Has anyone efi fimware to flash it ?

[polytek]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

hi,
before starting the flash, the bios chip is programmabe in place

[macattack600]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Has anyone efi fimware to flash it ?

do you have all efi firmware for apple?

[polytek]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

just this one i have repaired it and i read the bios chip,

[dellxps15]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

just this one i have repaired it and i read the bios chip,

what is your macbook mainboard code?

i have one 2008 c2d and one i7 working, so maybe mainboard i have here is one same as yours.

[techman1025]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

Hi
Always the first steps would be to ultra sonic cleaning board 65C with A1 cleaner then put by dehumidifier to dry most likely corrosion from spill go's under chips where you can't see it ...if you don't have a ultra sonic cleaner i would invest paided for mine in the first two mac books years ago. look at crest model's
Techman1025

[highpulse]

Re: Macbook Pro 13 2010 A1278 EMC:2351 wont power up

i got one doing the same , alltough , mine the magnetic tip is always green even ifs attached to the computer, and the battery chek indicator when i press it , nothing happen and no led is displayed there .
my bios is also a 4mb version