Repair Logic Board MBP 13'' A1278 - K24

[jpdo]

Hi,

I have an macbook pro and only works with charged battery, no power or charge with a magsafe.

I have read some voltages as you can see in the pictures attached.



With the DC-IN adapter out of logic board i have the correct voltages but when i connect it i dont have the voltages correct and are unstable.



What i need to verify to try solve this problem?

Can anyone help-me please?

Thanks

[jpdo]

Re: Repair Logic Board MBP 13'' A1278 - K24

Hi,

Anyone can tell-me what is this component (in yellow circle) and what serves

[DJduck]

Re: Repair Logic Board MBP 13'' A1278 - K24

Looks like a SMD resistor/diode/capacitor. Can you take a closer picture of it?

[jpdo]

Re: Repair Logic Board MBP 13'' A1278 - K24

Looks like a SMD resistor/diode/capacitor. Can you take a closer picture of it?

Hi,
unfortunatly i cannot take a pictur more closer because my motherboard have this missung component.

[DJduck]

Re: Repair Logic Board MBP 13'' A1278 - K24

Since it is black, its a resistor or a diode. If you can get a schematic for this laptop, then you could maybe identify that.
I found this: http://schemalaptop.blogspot.com/201...cbook-pro.html

[DJduck]

Re: Repair Logic Board MBP 13'' A1278 - K24

If any of the regulators/mosfets are causing problems (unstable voltages) you should replace them.

[ben7]

Re: Repair Logic Board MBP 13'' A1278 - K24

Tried a different charger?

[jpdo]

Re: Repair Logic Board MBP 13'' A1278 - K24

Tried a different charger?

Hi,

Yes i tried an different charger and doesnt work. Is the same thing.

Thanks

[jpdo]

Re: Repair Logic Board MBP 13'' A1278 - K24

If any of the regulators/mosfets are causing problems (unstable voltages) you should replace them.

But i dont know for where start because when i measure the dc-in board when is connected to logic board the voltages are unstable (between 0 and 15v) but when isn't connected the voltages are ok (stable 6.25v) in dc-in board.

[robrock1]

Re: Repair Logic Board MBP 13'' A1278 - K24

have you checked for any shorts? maybe something is getting hot?

[jpdo]

Re: Repair Logic Board MBP 13'' A1278 - K24

Hi,

My macbook now charges and turns on but with external monitor everything works fine, but with macbook display only appears white with some black stains, do you know what can be?.

Thanks

[jtamad44]

Re: Repair Logic Board MBP 13'' A1278 - K24

in that case, change screen panel

[jpdo]

Re: Repair Logic Board MBP 13'' A1278 - K24

in that case, change screen panel

But can't be a lvds display cable?

Thanks

[jtamad44]

Re: Repair Logic Board MBP 13'' A1278 - K24

if its lvds cable just pure white on screen without stains.

[DJduck]

Re: Repair Logic Board MBP 13'' A1278 - K24

Move the screen and see if anything changes. Did you replace that blown component next to the cable? That might be an issue.
Post a picture of the screen. I they are "artifacts" then you have a bad video chip. I had a Dell XPS M1530 that stripes and spots on the screen (the panel was fine) but it worked with an external monitor.

[jpdo]

Re: Repair Logic Board MBP 13'' A1278 - K24

hi.
Now my keyboard isn't working fine.
The 'P' Key and caps Lock Key doesnt work. And the AHT says that dont have any problem with logic board.

Anyone can help-me? What i need to check?

Another Problem is the display, i replace the lvds cable and continues with backlight but no picture, can be the component that i have missing?

Thanks

[crazypepe]

Re: Repair Logic Board MBP 13'' A1278 - K24

Hi Sir!

I am having the same issue with my macbook pro a1278 not charging I have changed the charger and the battery and tried resetting the smc still the same. I also swapped the magsafe terminal with a working one but still no charge. Whats was your solution?


thanks in advance!

[cyberhack]

Re: Repair Logic Board MBP 13'' A1278 - K24

here