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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- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

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!

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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 !

Monday 4 March 2019

LENOVO LAPTOP - LENOVO THINKPAD T450S – BUSINESS ULTABOOK LAPTOP - AC ADAPTER VOLTAGE TESTING PROCEDURE – BACKUP BATTERY TESTING – BACK COVER REMOVAL TO REPLACE THE BUILT IN BATTERY - KEY BOARD REMOVAL – DIAGNOSTIC PROGRAM - LAPTOP REPAIR AND SERVICE

LENOVO LAPTOP - Lenovo ThinkPad T450s – Business Ultabook laptop - AC adapter Voltage testing procedure – Backup battery testing – Back cover removal To replace the built in battery - Key board removal – Diagnostic program - Laptop repair and service

Category: Laptop repair and Service

Contents of this article

How to run Diagnostic program
How to test the AC adapter
How to teat RTC battery
Keyboard removal

Lenovo ThinkPad T450s

Bootable diagnostic programs
If the computer is not installed with the UEFI diagnostic program, you can download a bootable diagnostic program from the Lenovo Support Web site. The bootable diagnostic programs enable you to test computer memory and internal storage devices, view system information, and check and recover the internal storage devices. To use the bootable diagnostic programs, you can create a bootable diagnostic medium on a USB device or CD.
To create a bootable diagnostic medium, do the following:
1. Go to lenovo
2. Click Lenovo Bootable Diagnostics.
3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device or CD.
To use the diagnostic medium you have created, do one of the following:
# If you have created the bootable diagnostic medium on a USB device, do the following:
1. Attach the USB device to the computer.
2. Turn on the computer.
3. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key.
4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program will be launched automatically.
5. Follow the instructions on the screen to use the diagnostic program.
# If you have created the bootable diagnostic medium on a CD, do the following:
1. Turn on the computer.
2. Insert the CD into the optical drive.
3. Restart the computer.
4. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key.
5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program will be launched automatically.
6. Follow the instructions on the screen to use the diagnostic program

Power system checkout
To verify if a battery pack or an ac power adapter is functional, do the following:
1. Turn off the computer.
2. Connect the ac power adapter.
3. Turn on the computer. If the computer can be turned on, it means that either the battery pack or the ac power adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is still powered on, it means that the ac power adapter is functional.
5. Turn off the computer.
6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means that the battery pack is functional.

Checking the ac power adapter
You are here because the computer fails only when the ac power adapter is used.
# If the power problem occurs only when the docking station or the port replicator is used, replace the docking station or the port replicator.
# If the system status indicator does not blink three times when an ac power source is connected, check the power cord of the ac power adapter for correct continuity and installation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration:

Note: Output voltage of pin 2 of the ac power adapter might differ from the one you are servicing.

3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, replace the system board.
Note: Noise from the ac power adapter does not always indicate a defect.

Checking the battery and operational charging
To check for detailed battery status information, do the following:
#For 7: Open the Power Manager program and click the Battery tab.
# For 8 and Windows 8.1: Open the Lenovo Settings program and click Power.
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. Connect the computer to ac power to charge the battery. If the battery status icon in the Windows notification area indicates that the battery is not charging, remove the battery and let it return to room temperature.
3. Reinstall the battery. If the battery is still not charging, replace the battery pack.
4. Check the battery status icon 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 built-in battery.
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.

Disabling the built-in battery
Before replacing any FRU, ensure that you have disabled the built-in battery by doing the following:
1. Disconnect the ac power adapter and all cables from the computer.
2. Restart the computer. When the ThinkPad logo is displayed, press F1 to start the ThinkPad Setup program.
3. Go to Config > Power > Disable built-in battery.
4. Press Enter. A Setup Confirmation window is displayed.
5. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off automatically. Wait three to five minutes to let the computer cool.

DISASSEMBLING PROCEDURE

How to remove Base cover

Remove the external battery

Loosen the screws 1 in ascending alphabetical order (a to h) as illustrated.

Pry up the latches 2 in ascending alphabetical order (a to h) as illustrated, and then remove the base cover.

How to remove Keyboard

1. Use the flat end of the multi-tool to remove the rubber stoppers. If your computer does not have the rubber stoppers, ignore this step.

2. To reveal the screw heads beneath the frame, use the flat end of the multi-tool in the shipping package of the new keyboard to slide the keyboard forward by 2.5 mm (0.1 inch).

Note: Do not press and hold the keys while sliding the keyboard frame, otherwise the keyboard frame cannot be moved.

3. Use the cross end of the multi-tool to loosen the screws.

4. Slide the keyboard to the direction of arrow 4.

5. Remove the keyboard in the direction arrow 5.