Lenovo IdeaTab S2109A-F – Disassembling procedure – How to test the Battery pack – How to remove the battery pack – How to remove the back cover – How to test the charger – Tablet repair and service

Category: Tablet repair and Service 

Contents of this article 

  • Checking AC adapter 
  • Checking the battery charger
  • How to remove the battery 

Lenovo IdeaTab S2109A-F

Checking the AC adapter
You are here because the computer fails only when the AC adapter is used.
If the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity and installation.
To check the AC adapter, follow the steps below:
1. Unplug the AC adapter cable from the tablet.
2. Measure the output voltage at the plug of the AC adapter cable. See the following figure:

Note: Output voltage for the AC adapter pin No. 2 may differ from the one you are servicing.
3. If the voltage is not correct, replace the AC adapter.
4. If the voltage is acceptable, do the following:
Replace the system board.
Note: Noise from the AC adapter does not always indicate a defect.
Checking the battery pack
Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life.
Tap the battery icon in the icon tray, and the percentage of battery power remaining is displayed. To get detailed information about the battery, tap Battery under Settings In the applications list, to enter the battery information interface.
Note: If the battery pack becomes hot, it may not be able to be charged. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it.
To check the battery pack, follow the steps below:
1. Turn off the computer.
2. Measure the voltage between battery terminals 1 (+) and 14 (-). See the following figure:
3. If the voltage is less than +3.7 V DC, the battery pack has been discharged.
Note: Recharging will be continued for at least 3 hours, even though the indicator does not light on.
If the voltage is still less than +3.7 V DC after recharging, replace the battery.
How to remove Base cover
Note: Turn off the IdeaTab before you begin. Failure to do so may cause permanent damage to the IdeaTab.
Remove the four speaker coverings in direction shown by arrows 1.
Remove two screws 2, two screws 3 and three screws 4.
Insert the plastic plate tool between base cover and the panel module, then slide the plastic plate tool around the tablet in the direction shown by arrows 5 6 7 to separate the base cover from the rest of the tablet.
Remove the panel module in the direction shown by arrow 8.
Remove the speaker in the direction shown by arrow 9.
Remove the combo audio jack in the direction shown by arrow 10.
How to remove Battery pack
Disconnect the battery connector in the direction shown by arrow 1.
Remove the battery pack in the direction shown by arrow 2