Saturday, March 26, 2016

Lenovo TAB3 7 Essential – How to test the AC adapter – How to disassemble – How to remove the battery – Tablets repair and service

Category: Tablets Repair and Service 

Contents of this article

  • How to test the AC adapter
  • How to check the battery status  
  • How to disassemble the tablet 

Lenovo TAB3 7 Essential 

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 Tab AC Charger”
“Checking the internal battery status”
Checking the Tab AC Charger
When you use the IdeaTab AC Charger to charge the tablet but no power is charged, see the instructions in this topic to check the IdeaTab AC Charger.
To check the IdeaTab 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 microB 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.
Touch the application icon from the action bar and then touch Settings.
The Android Settings screen is displayed.
2.Touch About Tablet on the Android Settings screen.
3.Touch Status to view the accurate percentage of the remaining battery power. You also can touch Battery to check what applications are consuming battery power
DISASSEMBLING PROCEDURE 
How to remove Back cover
Insert the blade tool and slide along to release the back cover as shown below.

Remove the back cover.

How to remove System Board
Remove the 2 screws from the battery pack connector and the metal frame.

Then, unsnap the battery connector.

Peel off the Mylar for all connectors with a blade tool

Insert the blade tool to unsnap and release three cables.

Remove the four screws.

Lift up the system board from one side and remove it.

How to remove Battery pack
Remove adhesive tape following the direction of the arrows in the picture.
Make sure the tape is kept as parallel as possible to the battery.