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Hi everyone. I bought this MacBook Pro Late 2011 defect on ebay for 50 USD. I took out the motherboard and cleaned EVERYTHING on it (looks brand new) I popped In a 120GB SSD and 4 GB of Memory, booted It up and It now “PARTIALLY” works. The Problems I have Is the following:

  1. Trackpad Settings Is missing, It pops up with the “Wait for a bluetooth trackpad”
  2. Battery Is not detected at all, as soon as I take out the power cable It shuts completely off.
  3. Really slow on normal boot, but when I hold down the power button for 10 sec, plug in the cable, and then release the power button, the fans blow at full speed, but the MacBook runs a perfect speed without any issue. Have been trying to research this for about a week, but haven’t found anyone with the same issues, hope someone can help :-)

It sounds like the logic board was liquid damaged in some way. Your symptoms cover a few different areas of the logic board. Your MagSafe port may need to be replaced. do a proper inspection following this Apple T/N: Apple Portables: Troubleshooting MagSafe adapters Also make sure you have correct unit. The magnet is glued to the case as long as the glue is not interfering with the mounting of the connector you should be OK. Did someone re-glue it in? Starting with the battery the charging logic on the main logic board is damaged. There are a few MOSFET’s which can be damaged when they get wet (short out). The trackpad cable and/or the trackpad its self is damaged. Here is the IFIXIT guide to replace it: MacBook Pro 13" Unibody Late 2011 Trackpad Replacement Liquid spills often kill them. You’ll need to pop it out and inspect it for corrosion even still the liquid could have seeped into the layers of the trackpad. A slow system maybe a SMC type of issue. Your system has quite a few thermal sensors and some will cause the system to drop into Safe Mode to protect the system from overheating. You’ll need to get a good app to monitor what these sensors are telling you. Here’s what I use: TG Pro Post a screen capture of the main window so we can see what TG Pro is telling us.

On the battery, did you remember to plug it back in? I always forget to do that when working on my MacBook Air. Also, what did you use to clean the logic board?