Where is the battery sensor in an A1304?
I have a problem with a MacBook Air 2,1 A1304.
The MacBook runs fine from the power supply, but the battery will not charge and the computer will not run from the battery (even though a battery is present, working, and has over 60% charge). MacOS shows no battery present.
Running Mac Hardware Test results in error code:
Error code: 4SNS/1/40000001: TB1T-0.000
This is a temperature sensor error and - I presume - therefore the battery temperature sensor?
The question then is what, if anything, could be done about this?
I have searched widely but cannot find where the battery temperature sensor is located on an A1304. Any tips most welcome!
These photos illustrate the problem:
Coconut Battery - note the temperature!
No battery recognised in MacOS
System Report
But when booting with Ubuntu...
Battery is recognised - and has charge, but is NOT charging (MagSafe shows green LED)
More detail
Further update
The question was raised below if this was simply a battery problem. No - the same happens with other batteries I have tried, and the batteries are new or new-ish. These two screenshots show Coconut Battery and the Ubuntu battery overview - but with a different battery installed. The same faulty temperature reading in Coconut Battery.
Cette question est-elle utile ?
8 commentaires
Lets install this gem of an app: CoconutBattery and paste the main window here for us to see Ajout d'images à une question existante It will allow us to see whats happening a bit better.
par Dan
Hi Dan - Thanks! Photos now added. Data from both MacOS and Ubuntu.
par Jon Worth
@jonworth remove the battery and run the AHT and see what code you get. I am not convinced of this being a sensor error. If your MB does not recognize your battery it is possible that the sensor will give you erroneous results. What is the 820-xxxx number on your logic board? What happens if you unplug the Magsafe from your MBA while it is running?
par oldturkey03
@oldturkey03 Thanks for the reply! See also the discussion with @arbaman under his answer below. This looks more like a SMC problem than a battery problem in the end.
I have just run AHT again, without a battery, and that gives the very same error:
Error code: 4SNS/1/40000001: TB1T-0.000
So I think we can eliminate battery problems, and limit it then to SMC issues...
par Jon Worth
@jonworth that is correct and that is what my expectation was. I really don't care about the battery. I am not after the battery at all but trying to determine if it is the sensing circuitry between your battery and the SMC that has failed. For as long as your MBA does not recognize the battery it will most likely have issues with the sensor as well.
Would you mind to humor me and let us know what happens if you unplug the Magsafe from your MBA while it is running?
par oldturkey03
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