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Battery Not Charging, BIL LED error

I replaced thermal Paste on CPU and GPU then put the System back together.

After putting it back together, system did not want to charge the battery. I have reseated the battery several time and same issue. Also, The Battery Indicator Light is stuck on three or six when any type of power is present.

Reset PRAM/NVRAM - Same Issue

Reset SMC - Same Issue (but system turned on with out AC Adapter)

Ran AHT Experienced - 4sns/1/40000000: TB3T-128.000

- System Reports 0 Volts and 0% Charge in AHT

The system still runs fine but Battery charging/using functionality is lost

Any Suggestions/Soultions?

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I have repaired many macbooks with the same or similar problems. Sometimes the macbook wont recognize the battery. Symptoms can include the following:

When you plug in the charger the LED on the magsafe will have abnormal behavior like the LED will be a dull green instead of the normal bright green you see when the battery is fully charged. When the macbook is turned on the fans will be on at full speed and noisy. Monitoring Apps or widgets like iStat pro will not recognize or display battery specifications and temperatures from temp sensors. If you use the macbook without a charger the macbook works but the battery icon on the top right of the desktop will have an "X" through it. The macbook will freeze when you open up apps. When you quit apps they still stay on the dock and show up as still running.

Here are some things I have done to fix theses problems on some macbooks:

  • Disconnect removable devices from the macbook such as USB drives, firewire drives etc.
  • Remove any discs from the superdrive.
  • Disconnect the charger.
  • Remove the battery.
  • Press and hold the power button for 10 seconds.
  • Connect the charger while still holding the power button, keep holding the power button for 10 seconds. (Note: This must be done WITHOUT THE BATTERY)
  • Turn the macbook on and immediately press and hold command+option+P+R keys. Release the keys when you hear the apple chime sound 3 or 4 times. (must be done before you see the white screen at start up)
  • Shut off the macbook when you get to the login screen or the desktop.
  • While the macbook is OFF press and hold Command+Option+Left Shift+ Power Button for 5 seconds. The sleep LED will go crazy and you might hear a loud tone coming from the speakers. Press the power button one more time to restart the macbook.
  • Again shut off the computer and remove the charger.
  • Install the battery and try to turn on the macbook.
  • Check to see if the battery will charge now and if the macbook will recognize the battery.

If doing all these things does not work then there is one more thing that you can do that has worked for me in the past BUT I AM WARNING YOU, IT IS DANGEROUS SO TRY AT YOUR OWN RISK.

  • Remove the charger.
  • Remove the battery.
  • Press and hold the power button for 10 seconds.
  • While still holding the power button connect the charger.
  • While still holding the power button and the charger is plugged in connect the battery.
  • If the LED on the magsafe turns bright green then the problem is solved and the macbook is recognizing the battery again.

I hope this helps, good luck!!

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very helpful!!!!

thank you!!!!

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i got same issue. My laptop was able to turn on for a while while plugged in but and it would stay on even if i removed the charger. However if no charger was plugged in, it couldnt be started.

I tried to fix that issue of needing to having it plugged in for it to work but it didint work. Then the next thing that happened is if i turned it on, then removed the charger it would shut down right away.


And then i still tried to fix it but then what happened is it wouldnt start anymore even if plugged in

Now when I connect to charger, the lightt on the charger and battery indicator is green. When i try Vram reset or smc reset, the light remains green. Any ideas of what could be weong? thanks!!

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