REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Thursday 28 February 2019

LENOVO TAB3 7 ESSENTIAL – HOW TO TEST THE AC ADAPTER – HOW TO DISASSEMBLE – HOW TO REMOVE THE BATTERY – TABLETS REPAIR AND SERVICE

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.