Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

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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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
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 THINKPAD X1 TABLET – AC ADAPTER TEST PROCEDURE – BACKUP BATTERY TEST PROCEDURE – HOW TO CHECK THE INTERNAL BATTERY – RESETTING THE TABLET - LAPTOP REPAIR AND SERVICE

Lenovo ThinkPad X1 Tablet – AC adapter test procedure – Backup battery test procedure – how to check the internal battery – Resetting the tablet - Laptop repair and service

Category: Laptop Repair and Service

Contents of this article

How to test the AC adapter
How to test the backup battrey
How to reset the tablet

Lenovo ThinkPad X1 Tablet

Power system checkout
To verify a symptom, do the following:
1. Turn off the tablet.
2. Connect the ac power adapter.
3. Turn on the tablet. If the tablet can be turned on, it means that either the battery or the ac power adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the tablet. If the tablet is still powered on, it means that the ac power adapter is functional.
5. Turn off the tablet.
6. Disconnect the ac power adapter and turn on the tablet. If the tablet can be turned on, it means that the battery is functional.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
# “Checking the built-in battery”
# “Checking the operational charging”
# “Checking the coin-cell battery”
# “Checking the ac power adapter”
Checking the built-in battery
This tablet supports only batteries specially designed for this specific system and manufactured by Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries designed for other systems. If an unauthorized battery or a battery designed for another system is installed, the system will
not charge.
If the tablet cannot start, do the following to check whether the built-in battery is failed:
1. Ensure that the tablet failure is not caused by exhausted battery power.
2. Reset the tablet by inserting a straightened paper clip into the emergency reset hole. Then press the power button. If the tablet cannot be turned on, continue with the next step.
3. Clear Complementary Metal Oxide Semiconductor (CMOS) by disconnecting the ac power adapter, coin-cell battery, and built-in battery.
4. Connect the built-in battery and ac power adapter, and then press the power button.
# If the tablet can be turned on, disconnect the ac power adapter from the tablet. If the tablet turns off, it means that the built-in battery fails.
# If the tablet cannot be turned on, replace the built-in battery with another one. If the tablet can be turned on with the new battery installed, it means that the original battery fails.
Checking the operational charging
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
2. Perform operational charging. Tap or click the battery status icon in the Windows notification area to display detailed battery information. If it indicates that the battery is not charging, replace the battery.
3. Check the battery status again. If the same error still exists, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the internal battery pack
2. Remove the coin-cell battery.
3. Measure the voltage of the coin-cell battery. See the following illustration

If the voltage is correct, replace the system board.

# If the voltage is not correct, replace the coin-cell battery.
# If the coin-cell battery discharges quickly after replacement, replace the system board.
Checking the ac power adapter
This tablet supports only the Lenovo USB-C 45W AC Adapter. When the adapter is connected to the tablet, the output voltage at the adapter plug rises from 0 V (when not connected) to 5 V. Then the power delivery communication starts. The ac power adapter outputs 20 V according to the tablet output voltage request. When you use the ac power adapter to charge the tablet but no power is charged, see the instructions in this topic to check the ac power adapter.
Note: Noise from the ac power adapter does not always indicate a defect.
To check the ac power adapter when the tablet does not charge, do the following:
1. Disconnect the ac power adapter from the tablet.
2. Connect a new ac power adapter to the tablet.
3. If the tablet charges, replace the ac power adapter

Resetting your tablet
If your tablet does not perform well, you might consider resetting your tablet. In the resetting process, you can choose to keep your files or remove them, and then reinstall the Windows operating system. To refresh your tablet, do the following:
Note: The graphical user interface (GUI) items of the operating system might change without notice.
1. Open the Start menu . Tap Settings > Update & security > Recovery.
Note: Settings might not be displayed in the Start menu. In this case, tap All apps to find Settings.
2. In the Reset this PC section, tap Get started.
3. Follow the instructions on the screen to refresh your tablet