Saturday, March 19, 2016

LENOVO IdeaPad Tablet K1 – Battery charger testing – battery test procedure – How to disassemble the tablet K1 – How to remove the battery

Category: Ipads and Ipods Repair and Service 

Contents of this article 

  • How to test the charger 
  • How to test the battery
  • How to disassemble the tab 


LENOVO IdeaPad Tablet K1

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.
To check your battery, move your cursor to the Power Meter icon in the icon tray of the Windows taskbar and wait for a moment (but do not click it), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the
Power Meter icon.
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 +11.0 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 +11.0 V DC after recharging, replace the battery.
4. If the voltage is more than +11.0 V DC, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 KΩ. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.
Restore of factory default
The IdeaPad Tablet K1 computers come with pre-installed OneKey Rescue System. In order to save application files and the initial backed up files of the system, the hard disk in a Lenovo computer includes a hidden partition when it is shipped. If you need to restore the system to the point of your first boot up, just enter Lenovo OneKey Rescue System and run Restore to factory default.
DISASSEMBLING PROCEDURE 
Base cover
Remove the base cover in the direction shown by arrows 1 2.
Note: Turn off the tablet first. Otherwise, it may cause permanent damage to the tablet.
Battery pack
Remove four screws 1. Disconnect the connector in the direction shown by arrow 2.
Remove the battery pack in the direction shown by arrow 3.
Middle cover
Remove four screws 1 and two screws 2. Remove the middle cover in the direction shown by arrow 3.