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The MacBook start normally if I disconnect the trackpad cable.

Can you help me?

I am working on an A1398 Mid 2015. I've seen someone working on it. The bios had been replaced but not the right bios. Then I ordered the correct and placed it. After I've set up, I want to reset the PRAM and I let go of the chime sound 1 times. Start up and load the status bar icon and stop and restart. If I run this 2 times PRAM and I hear the chime twice, the Apple logo does not start. Now I tested the following.

If I disconnect the trackpad flex cable he will start. The battery will not charge and the keyboard will not work. But he works either. When I put the flex cable back on while it's on, the trackpad and keyboard will work but the battery will not charge.

Now I want to know if this could be the problem of the bios. The trackpad and cable and keyboard and battery are perfect in order. Have tested the logic board in another Mid 2015 and gives the same problem.

Could it be that the problem is in the bios or somewhere else.

I do not see any other problem outside the bios and all the components look very good. The bios affect the operation of your keyboard trackpad and battery? Would you like to let me know something?

Thank u

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Often a system with an altered EFI (BIOS) was stolen. When I note there was an alteration I always see if the 'About This Mac' S/N matches the systems S/N on the bottom cover.


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Have you tried replacing the ribbon cable? I would do that first.

Sadly, Apple makes it really hard to replace the trackpad in this series. At this point the trackpad is most likely damaged and/or the keyboard it's self was damaged due to liquid damage. Inspect the markers to see if they offer a clue.

Here is what you'll need to do to get the to trackpad: MacBook Pro 15" Retina Display Mid 2015 Battery Replacement.

If you think the keyboard is also damaged it might make sense to just replace the complete upper case assembly. While more expensive from a parts perspective. The probability of repairing the keyboard after liquid damage is not that high and the amount of labor is quite high getting it all apart and back together working as it was.

Here's the IFIXIT guide: MacBook Pro 15" Retina Display Mid 2015 Upper Case Assembly Replacement

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