Liquid damaged laptop; power problems after fix
So I received a friend's liquid damaged laptop and offered to try and fix it. Apple wanted to replace the logic board which wasn't a cost-effective option so my friend decided not to have it fixed. I offered to take a look and determined that having the keyboard and trackpad connected on startup was the cause of the panics.
Bought a new trackpad / upper case and installed it. The computer runs well now but there are a few quirks:
- The fan always runs on high
- The computer tells me there is "no battery available" even when the MagSafe is disconnected and it's clearly running off the battery (it even says "power source battery")
- The MagSafe charger light doesn't turn on when plugged in
2 and 3 sound like DC in board problems but I'd like to do some more troubleshooting first to make sure this is the case (sometimes old batteries report as not existing and sometimes the charging light doesn't turn on for whatever reason). What troubleshooting steps can I take to figure out these problems?
New symptoms: the computer won't go to sleep by either the apple menu nor closing the lid. The fan continues to spin and any activity will wake the screen to the password screen. I don't know if this is related to any of the above points or is useful.
When taking apart the computer again to continue troubleshooting I re-discovered something that may be corrosion on the left side of the logic board:
I've got an unused toothbrush and some 99% isopropyl alcohol, should I start cleaning?
I had taken off the logic board again in order to clean it when I figured out where and how to use the multimeter (somewhat). So I wiggled the DC in board connector and put the thing back together. I tried booting it up but nothing happened! So I plugged it in and - wonder of wonders - the MagSafe light comes on and the computer boots!
I was able to read "1." off the 2 DCV setting (so 2 direct current volts?) for pin 14 of U7000, which seems to be correct. Also read "1." off pin 12.
Considering that one of the symptoms has changed, I'm going to see what other symptoms might remain.
All symptoms are gone. I'm going to chalk it up to the wiggling the DC in board connector and call it good. It's been a wild ride and I've learned a bit about the circuitry in computers. Thanks for the help!