very strange battery and ac behavior: won't charge/no led on magsafe
I just picked up this MacBook, and it looks like it saw some liquid. I had to replace the trackpad cable, but everything else seems to be fine, except:
the battery/charging system. it's driving me crazy.
the MacBook works perfectly off of a battery, but it won't charge a battery.
the MacBook works perfectly off of the ac adapter with no battery installed.
when a battery is installed, I connect the magsafe and it does NOT illuminate.
I have tried four separate batteries (known working) and three different magsafes.
when I install a known working, but discharged battery:
it will not power on, even when magsafe connected. magsafe will not illuminate
when I disconnect that battery, it boots from AC just fine with a solid green light
when I install a charged battery, and connect the magsafe and boot:
MacBook boots fine, works off of battery, but reports no AC power
I have replaced the DC in board, and the battery sensor. battery sensor lights are working fine, reporting various charge states of my different test batteries.
I have reset PRAM, and swapped in a different hard drive with 10.11 installed. I cannot seem to reset the SMC with this situation... I've tried with battery, but I get no magsafe lights to confirm reset. I've tried without battery, but the magsafe never indicates SMC reset.
while typing this, I glanced over and saw an orange LED on the magsafe, while a battery is installed. awesome. I watched the battery go from 90% to 94%, then yanked the magsafe. I cannot duplicate the charging.
is it time to part this bad boy out?