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Problems after replacing Battery and Trackpad

C

charlyem

macrumors newbie
Original poster
Hi Everyone,

I recently bought a 2nd-hand Macbook Pro 2012. My previous computer was the same model,I was happy with it because I could replace most of the parts and I thought buying another I could reuse some parts of the old one.
The Story:
1 - The computer I bought worked fine but the battery lifetime was shorter than my older one
2 - The trackpad was also worst than my old one
Then, I decided to change both parts and replace them with those of my old computer

The Result:
1 - The trackpad works but the system doesn't recognise it
2 - The system neither recognizes the battery, therefore it doesn't charge (the computer works plugged)

We've tried:
1 - to use the battery inanother laptop and it works
2 - to replace again with the original ones and the same problem persists
3 - to reset nvram and smc and the problem persists

Any idea? It doesn't seem a hardware problem but I have no idea how to solve the software issue
 
In fact the mac they came from (my old one) didn't worked anymore (board problem). So I can't do that. However, the original battery and trackpad from the new one (I wanted to change them but they were working) don't work anymore when I put them back again.
 
Sounds like there is an issue with the logic board since the battery is working in another MacBook.

I suggest carefully examining the trackpad and battery connections and the surrounding area for possible damage.
 
I mean, I don't think it's a problem of connections because the trackpad "work" (I mean I can use it) but the system doesn't recognize it, so, for example, I can't configure it
 
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