Chosen Solution
Hey! I have a Macbook air and I am trying to figure out what is wrong with it. The macbook doesn’t work without the AC plugged in. The battery does charge after I disconnect and then reconnect the battery and the I/O flex cable. But when I reboot it after that it stops charging again and only shows a green indicator. Hardware test, SMC reset, PRAM reset and complete factory reset did not do anything. Battery info is: Battery Information:Model Information:Serial Number: D8612460820DKRNA7Manufacturer: SMPDevice Name: bq20z451Pack Lot Code: 0PCB Lot Code: 0Firmware Version: 406Hardware Revision: 1Cell Revision: 162Charge Information:Charge Remaining (mAh): 3356Fully Charged: NoCharging: NoFull Charge Capacity (mAh): 5888Health Information:Cycle Count: 727Condition: NormalBattery Installed: YesAmperage (mA): 18Voltage (mV): 7739 Everything is original in the macbook and I have already tried it with other chargers. My main question now is: can I find out if it is the battery, the I/O board or the I/O flex cable?
The laptop should be able to run off the charger only when battery is disconnected.
- If you disconnect battery and laptop works using charger only, replace the battery.
- If you disconnect battery and laptop cannot run from the charger, it means it has a board level failure. The failing part may be the I/O board, the main logic board, or like as I just recently encountered, both I/O and main board. Furthermore, the battery info as you’ve shown us seems to indicate that it is fine but not being charged by the laptop. There is no easy way to diagnose I/O vs. main board except by testing with known good ones to narrow it down.
You most likely have a issue with your CSO current sense lines or ISL6259AHRTZ (U7100) chip. Try a new battery and if it still does it you have a board issue. This is pretty common on older machines. The ISL fails over time and causes issues like this. Best of luck!
It’s because it’s overheating
