Sunday, May 29, 2016

Lenovo TAB 2 A7-30 – Disassembling procedure – How to test the charger – How to remove the battery – Tablet repair and service

Category: Tablets Repair and Service

Contents of this article 

  • How to remove the battery
  • How to check the AC adapter 
  • How to check battery status 

Lenovo TAB 2 A7-30 

To verify a symptom, follow the steps below:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the AC adapter.
4. Make sure that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the AC adapter and install the charged battery pack.
7. Make sure that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
“Checking the Computer AC Charger”
“Checking the internal battery status”
Checking the Computer AC Charger
When you use the computer AC Charger to charge the tablet but no power is charged, see the instructions in this topic to check the computer AC Charger.
To check the computer AC Charger, do the following:
1. Disconnect the micro-USB cable from the tablet.
2. Measure the output voltage across the connector marked B of the micro-USB cable. Refer to the following figure
Note: The output voltage across pin 3 of the micro-B connector might be different from the one you are servicing.
3. If the voltage is not correct, replace the micro-USB cable.
4. If the voltage is acceptable, replace the system board.
Checking the internal battery status
To check the battery status of the tablet, do either of the following:
Approximate information about the battery status
Get the approximate status of the battery at any time by checking the battery status icon on the system bar in the upper-right corner of the screen. The shorter the green bar is, the less the battery power remains.
Accurate information about the battery status
To get the accurate information about the battery status of the tablet, do the following:
1. Open the Android Settings screen.
To open the Android Settings screen, do either of the following:
 From the main Home screen, touch the Android Settings icon on Lenovo Launch Zone. The Android Settings screen is displayed. Pull down the application icon from the action bar and then touch Settings. The Android Settings screen is displayed.
2. Touch Battery in the Device section on the Android Settings screen.
3. The accurate percentage of the remaining battery power is shown on the screen.
DISASSEMBLING PROCEDURE 
Rear cover and side key
1. Hold the tablet in one hand and use a triangle paddle to unlock the rear cover from the tablet along the joint line as shown in the figure below.
2. Slowly remove the rear cover.
3. Remove the side key from the rear cover using a pair of pointed tweezer.
Battery pack
1. Remove screws 1 on the metal piece for fixing the battery FPC as shown in the figure below.
2. Remove the metal piece using a pair of tweezers.
3. Disconnect the battery FPC from its connector on the main board using a triangle paddle.
4. Remove the battery pack from the front module of the tablet.