lenovo t420 lcd panel replacement instructions free sample

This is not the Lenovo Thinkpad T420. You can Tell by the RAM memory Slot Cover and the Position the RAM is put into its slot. the T420 RAM is Vertical Compared with being Horizontal in this Picture. that includes the cover also. Then the Battery Slot is a Dead Giveaway clue. The T420 Battery slot is in the middle. and this Picture has the battery slot to bthe left. Sorry Not Even Close. None of the screws he removes are on the T420. so this is Completely Useless. Thanks

I have managed to connect two external monitors (in addition to the built-in panel) to my ThinkPad T430 on Ubuntu 13.04, with Optimus ("Switchable graphics") enabled (option 3 in your list). The monitors are connected via the DVI interface, one of them is rotated. In contrast to other solutions, all monitors are attached to the same window manager, so windows can be moved freely between the monitors. This achieves the goal of enhanced battery life if disconnected and using external monitors if connected.

NOTE: force_I_want_a_brick is not scary. Do not be scared! This merely disables the safety checks in flashrom. Flashrom and coreboot change a lot, over the years, and sometimes it’s necessary to use this option. If you’re scared, then just follow the above instructions, but remove that option. So, just use -p internal. If that doesn’t work, next try -p internal:boardmismatch=force. If that doesn’t work, try -p internal:boardmismatch=force,laptop=force_I_want_a_brick. So long as you ensure you’re using the correct ROM for your machine, it will be safe to run flashrom. These extra options just disable the safetyl checks in flashrom. There is nothing to worry about.

Lenovo BIOS restricts write access, but there is a weakness in it. With a specially patched flashrom binary, you can easily flash it but the top 64KiB region of the boot flash, containing your bootblock, cannot be flashed just yet. However, there is a register called the Backup Control or BUC register and in that register is a status bit called Top Swap or TS.

WARNING: if flashrom complains about /dev/mem access, please run sudo ./bucts 0. If flashrom is complaining about /dev/mem, it means that you have CONFIG_STRICT_DEVMEM enabled in your kernel. Reboot with the following kernel parameter added in your bootloader: iomem=relaxed and try again with the above instructions. DO NOT continue until the above works, and you see the expected flashrom output as indicated above.

If you did run flashrom and it failed to flash, but you set bucts to 1 and shut down, don’t worry. Just remove the yellow coin-cell battery (it’s underneath the keyboard, connected to the mainboard), wait a minute or two, reconnect the coin-cell and try again from scratch. In this instance, if flashrom didn’t do anything, and didn’t flash anything, it means you still have Lenovo BIOS but if bucts is set to 1, you can flush it and set it back to 0. BUC.TS is stored in volatile memory, powered by that CR2032 coin-cell battery.

If you messed up, there are external flashing instructions. See main navigation menu on this page. These “external” instructions teach you how to flash externally, using special equipment (requires disassembling your laptop and removing the mainboard).

NOTE: Internal flashing is also possible, on this machine, from vendor firmware, but it’s still recommended to use a clip and a SPI flasher. However, follow internal X230 flashing from Lenovo firmware if you wish.

Read board documentation for disassembly. (same instructions as X230, for this purpose of external flashing, but full disassembly will differ slightly)

Summary: The Lenovo laptop black screen of death issue may occur due to various reasons. However, if you deal it with caution, you can resolve it on our own. In this post, we have mentioned the probable causes behind the black screen of death issue in Lenovo laptops and discussed some effective solutions to fix this issue.

In this post, we will be discussing about ‘what causes the Lenovo laptop black screen issue’, ‘what are the early warning signs’, and ‘how to resolve the Lenovo black screen of death issue’.

Hard disk errors are one the most common causes behind the Lenovo laptop black screen issue. The typical causes for the hard disk errors, include power outages/ fluctuations, hardware failures, poor system maintenance, viruses, or manual negligence.

If your Lenovo laptop is not starting up and showing a black screen, the faulty battery could be the reason behind it. The early signs that your laptop battery is going to fail include overheating, failing to charge, short-run times and shutdowns, replacement warnings, etc.

Sometimes, the Lenovo laptop black screen problem occurs due to the peripheral devices connected to the laptop viz. external hard drive, printer etc. that might be malfunctioning or corrupted due to some error or infection.

One of the reasons for the black screen issue in Lenovo laptops is the loss of connection between the screen display and the Windows operating system. However, you can fix it easily by resetting the display mode of your laptop. All you need to do is to press Windows () + Ctrl + Shift + B.

If the Lenovo laptop is not starting usually and showing a black screen, there may be an issue with the display itself. You can conduct a display check by connecting an external monitor or Smart TV or check BIOS and RAM.

The Lenovo laptops are one of the best devices available and trusted by users for their optimal performance. Like every machine, Lenovo laptops might develop some issues. The Lenovo laptop black screen is one such issue that the users have reported. In this article, we have mentioned the solutions to resolve this issue. In case you have lost the data, you can use the Stellar Data Recovery Professional software to recover the data.

First Edition (February 2011) © Copyright Lenovo 2011. LENOVO products, data, computer software, and services have been developed exclusively at private expense and are sold to governmental entities as commercial items as defined by 48 C.F.R. 2.101 with limited and restricted rights to use, reproduction and disclosure.

For details, refer to the instructions in “Using the media card reader” on page 79. Media card reader slot Depending on the model, your computer may have a media card reader slot. The media card reader supports the following cards: •...

Your computer might include a PCI Express Mini Card in the PCI Express Mini Card slot which enables wireless WAN communications. With Lenovo technologies advancing to provide you with the best engineered systems, some models are equipped with a mSATA solid state drive for data storage.

100. Getting connected in different locations is a challenge? • To troubleshoot a wireless networking issue, see http://www.lenovo.com/support/faq. • Take advantage of the networking features by use of “Access Connections” on page 20.

Note: If you have logged on with an administrator user ID in Windows XP, and you press Fn+F3, the panel for selecting a power scheme appears. If you have logged on with another user ID in Windows XP, and you press Fn+F3, the panel does not appear. •...

For Windows 7 and Windows Vista: 1. Click Start ➙ Control Panel ➙ Hardware and Sound ➙ Sound. The Sound window appears. 2. Click the Playback tab or Recording tab, and then click a device, which you want to customize. 3.

The battery pack is a consumable supply. If your battery begins to discharge too quickly, replace the battery pack with a new one of the type recommended by Lenovo. For more information on replacing the battery pack, contact your Customer Support Center.

Your computer can be wireless upgradeable. This means that your computer has an antenna that can support wireless LAN access when wireless LAN access points are available. Wireless devices are available from Lenovo. For more information, refer to “Finding ThinkPad options” on page 149. Using wireless WAN connections Wireless Wide Area Network (wireless WAN) enables you to establish wireless connections over remote public or private networks.

Some other virtual device drivers will be installed on demand when you use certain Bluetooth profiles for the first time. Using the Microsoft Bluetooth software If you are using Windows XP and want to use the Microsoft standard Bluetooth features, install the software by following the instructions in “Installing the Microsoft Bluetooth software in Windows XP”...

2. Click Start ➙ Run. 3. Type C:\SWTOOLS\Drivers\TPBTooth\Setup.exe (or specify the full path to the setup.exe file you have downloaded from http://www.lenovo.com/support); then click OK. 4. Click Next. 5. Select I accept the terms in the license agreement; then click Next.

For Windows 7: To start the Access Connections wizard, see “Accessing applications in Windows 7” on page 19, and follow the instructions on the screen. For Windows Vista and Windows XP: To start the Access Connections wizard, click Start ➙ All Programs ➙ ThinkVantage ➙...

Lenovo cannot reset your passwords or recover data from the hard disk. You must take your computer to a Lenovo reseller or a marketing representative to have the hard disk drive replaced. Proof of purchase is required, and a fee will be charged for parts and service.

Attention: You might want to note your password and keep it in a safe place. If you forget your supervisor password, Lenovo can not reset your password. You must take your computer to a Lenovo reseller or a Lenovo marketing representative to have the system board replaced. Proof of purchase is required, and a fee will be charged for parts and service.

If you forget your hard disk password, Lenovo cannot reset your password or recover data from the hard disk. You must take your computer to a Lenovo authorized servicer or a marketing representative to have the hard disk drive replaced. Proof of purchase is required, and a fee will be charged for parts and service.

ThinkPad Web site at: http://www.lenovo.com/support/site.wss/document.do?sitestyle=lenovo&lndocid=tpad-matrix If you do not have a diskette drive, you can install Intel Rapid Storage Technology Driver by the following...

10. Install Windows XP Service Pack 3. You can install the Windows XP Service Pack 3 using the Windows XP Service Pack 3 Installation CD or download it from either Microsoft Download Center or Microsoft Windows update Web site. 11. Visit the Lenovo Web site at: http://www.lenovo.com/support/site.wss/document.do?sitestyle=lenovo&lndocid=tpad-matrix 12. Download Intel Rapid Storage Technology Driver from the Web site.

Table 8. Config menu items (continued) Display Boot Display Device • ThinkPad LCD Select the display device that is to be active at boot • Analog (VGA) time. This selection is • Digital on ThinkPad effective for boot time, password prompt, and •...

Take care in setting passwords • Remember your passwords. If you forget a supervisor or hard disk password, Lenovo will not reset it, and you might have to replace your system board, or hard disk drive or solid state drive.

2. Click Control Panel ➙ Hardware and Sound. 3. Click Device Manager. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. 4. Double-click Modems. 5. Right-click the device, and click Enable. For Windows XP: 1.

1. Click Start ➙ Control Panel. 2. Click Hardware and Sound 3. Click Sound. 4. Click the Recording tab in the Sound window. 5. Select Microphone, and click the Properties button. 6. Click the Levels tab, and move the Microphone Boost slider upwards. 7.

• Lenovo hardware repair - If the problem is determined to be caused by Lenovo hardware under warranty, trained service personnel are available to provide the applicable level of service. • Engineering change management - Occasionally, there might be changes that are required after a product has been sold.

Table 12. World-wide telephone list (continued) Country or Region Telephone Number Norway 8152-1550 (Warranty service and support) (Norwegian) Panama 206-6047 001-866-434-2080 (Lenovo Customer Support Center- toll free) (Spanish) Peru 0-800-50-866 (Spanish) Philippines 1800-1601-0033 (Local number only) +603 8315 6858 (DID) (English and Filipino) Poland...

If you want to replace it with a new one, contact your place of purchase or ask for a repair service provided by Lenovo. If you have replaced it by yourself and want to dispose of the disused lithium battery, insulate it with vinyl tape, contact your place of purchase, and follow their instructions.

ThinkPad is a line of business-oriented laptop computers and tablets designed, developed and marketed by Lenovo, and formerly IBM. The line was originally sold by IBM until 2005, when a part of the company"s business was acquired by Lenovo.

Notes: tpacpi-bat is already covered in tp_smapi. tp_smapi#Supported laptops also already covers supported ThinkPads. (tp_smapi is already mentioned in the parent page at Laptop#See also, so it may be unnecessary to mention it here again to avoid duplication.) (Discuss in Talk:Laptop/Lenovo)

Battery Conservation Mode is a feature that limits battery charging to 55-60% of its capacity to improve battery life, being most useful when the laptop tends to run on external power much of the time. This works on many Lenovo laptops like IdeaPad and Thinkbook series. To check if your laptop is supported, try to set the battery conservation mode in the Vantage app on Windows. If it works on Windows, it can be enabled or disabled on Linux in the following manner:

To solve all these issues mentioned here easier just install the latest BIOS update from Lenovo support website. Missing IVRS map in ACPI Table, add amd_iommu=pt ivrs_ioapic[32]=00:14.0 in kernel parameters. In order to get X to work correctly, add iommu=soft in kernel parameters (Linux 4.20 only). In order to get microsd (SDHCI) working, echo "options sdhci debug_quirks2="0x8000"" > /etc/modprobe.d/sdhci.conf and change module load order MODULES=(sdhci sdhci_pci) in /etc/mkinitcpio.conf (line 7). Do not forget to run mkinitcpio -p linux afterwards. Bluetooth does not work until a suspend/resume cycle occurs.

I recently purchased a used Lenovo Thinkpad T420 laptop to replace the Lenovo Thinkpad T400 I was previously using as my main platform for researching open-source network simulators and emulators. The T420 is a five-year old product but it offers all the ports and performance I need. Because it is well past its depreciation curve, anyone can purchase a used T420 for a very low price.

I wanted a computer that supports high-resolution external monitors so it required a DisplayPort output. I also wanted to expand the number of VMs I can run concurrently with adequate performance so I needed a processor that supports HyperThreading. I wanted to switch to the Ubuntu Linux distribution and the Ubuntu Unity desktop environment needs just a bit more processing power to run smoothly. The Lenovo Thinkpad T420 meets all these requirements.

The Lenovo Thinkpad T420 is a business-class notebook produced in 2011 that was leased in large volumes by companies for use by their employees. Now, these companies are returning these computers to the leasors so Lenovo T420 laptops are available at used-computer re-sellers and on eBay at very low prices.

When purchasing a used Lenovo T420, you need to be aware of what you will get for your money. The Lenovo Thinkpad T420 was originally produced in many different configurations. When comparing prices, take into account the features added to the computer.

When looking for a used T420, I suggest you purchase a model with the 1600×900 LED screen. Other parts of the T420, such as the hard drive and memory, are easy to upgrade. Some models of T420 come with a discreet NVIDIA graphics chip, which is not important for most users so don’t pay extra for it. Some models offer a fingerprint reader, which is a convenience.

Upgrading memory on a Thinkpad 420 is very easy. When Lenovo installs the base level of memory in a Thinkpad, it only uses one memory slot so it is inexpensive to upgrade the laptop to 8GB by purchasing one more 4GB DIMM — and the second slot is very easy to access.

Replacement parts for the T420 are still available and Thinkpads are made to be easily repairable. You can download the T420 maintenance manual from the Lenovo web site. For example, the T420 I purchased has a few keys on which the letters are fading. If I decide to replace these keys, I can find multiple online stores that sell replacement keys just by searching for “thinkpad T420 key replacement” on Google.

The T420 I purchased was a well-equipped model with the Intel i5-2540M processor, a 1600×900 HD+ LED screen, Intel HD Graphics 3000 and NVIDIA NVS 4200M discreet graphics with Optimus graphics switching technology, a fingerprint reader, a webcam, 4GB memory, and a 320 GB 5400 RPM hard drive. It also has four USB2 ports, a Firewire port, a VGA output, and a DisplayPort output that supports an external monitor with up to 2560×1600 resolution. It came with Windows 7 Professional already installed.

As mentioned above, the T420 I purchased has an NVIDIA NVS 4200M discreet graphics chip. In Windows, the laptop will switch between the Intel graphics and the NVIDIA graphics as required by programs running. Unfortunately, the graphics switching technology does not work well in Linux so we must do some extra configuration to enable manual graphics switching, or just disable the NVIDIA graphics in the BIOS settings.

The T420 I purchased came with Windows 7. When I booted up Windows 7, it offered a free upgrade to Windows 10. I chose not to upgrade to Windows 10 because it is not clear if the NVIDIA Optimus graphics switching technology will be supported in Windows 10.

Lenovo does not officially support the T420 with Windows 10 so they will not provide updated Windows 10 drivers. Without the right drivers for the NVIDIA chip and for power management, battery life may be much shorter in Windows 10.

For now, I will keep Windows 7 so that the NVIDIA switchable graphics and Lenovo power management features continue to provide good battery life when I run Windows.

I am very pleased with the performance of my used Thinkpad T420 laptop when running Ubuntu Linux. In two or three years, I will upgrade to a Lenovo T450 or X1 Carbon when those models are close to the same US$200 price point that the T420 is at today.

“The LenovoT420s is an excellent laptop for business users, and also well worth the consideration of consumers who prefer an excellent keyboard and durable design to flashy aesthetics.”

IBM’s original T20 was offered only with a 14.1-inch display, but over the years the line has expanded. High performance and 15.6-inch variants were made available. More recently, Lenovo decided to spin off a thinner, lighter version — resulting in the T420s.

Though this is the thin-and-light version of the T420, don’t mistake it for an Ultrabook. The 14.1-inch display and maximum thickness of just over one inch seemed modern when the original T400s arrived in 2009, but today it’s merely average. It does allow for a standard Core i5-2520M processor, however, which means performance should be much better than what is provided by today’s thinnest laptops.

Lenovo is debuting an Ultrabook version of the T-Series, called the T430u, later this year. Which raises the question: Is the T420s a good choice, or is this thin and light losing ground to more modern designs? Let’s find out.

When Lenovo took over the ThinkPad line from IBM there was widespread fear that the brand would be watered down. Instead, the company has remained shockingly stubborn. This T420s is thin, but its appearance is otherwise not much different than the laptops made ten years ago.

The T420s’ designation as a thinner version of the T420 is literal. We’ve had the chance to see both, and the design elements are the same right down to the size of the display bezel, the hinges used and the location of the latch (yes, this laptop has a display latch, a feature long gone from consumer products).

Connectivity is the only major change. Due to its thinner profile this laptop offers only three USB 2.0 ports, DisplayPort, VGA, Ethernet and a card reader. That’s down a couple ports to the normal T420, but it’s also much better than what is provided by most laptops of similar size. Better still, the ports are mostly along the rear of the laptop. That’s beneficial because it means peripheral cords are less likely to get in your way.

Similarities between the T420 and T420s continue with the user interface. The keyboards on both appear to be identical, which means that the thinner model has the same excellent key feel. While most of the competitions — including HP’s own business-oriented Elitebooks — have transitioned over to island-style keyboards, Lenovo has continued on with beveled keys. The result is not as visually attractive, but we think this design is better for high-speed touch typing.

Users new to the ThinkPad brand will undoubtedly be tripped up by the location of the function key, which is located where the Ctrl key is on every other keyboard ever produced. This strange layout has been used for years, so it’s unlikely to be changed soon. On the other hand, the T420s offers dedicated buttons for speaker mute, microphone mute and volume as well as double-sized Escape and Delete keys. These enhancements more than make up for the layout’s other oddities.

The T420s is a business laptop, and as such it comes with a matte display, making it possible to use the laptop in many different environments. Even outdoors use is possible with the display’s brightness turned to maximum.

At idle, the fan of the T420s isn’t audible. At load, the fan spins up a bit, but still remains quiet. This is one of the least audible cooling systems that we’ve ever heard.

Though built to be thin and light, the T420s isn’t the most portable laptop around. Its 14-inch display puts it at a disadvantage compared to 13.1-inch or 13.3-inch laptop. The laptop’s weight of about 3.9 pounds is far from classleading, as well.

With that said, the T420s is reasonably small. It will fit in most bags that accommodate a 13.3-inch laptop and is light enough to tote around on a regular basis.

All ThinkPad T420s laptops come with a standard six-cell battery. In our Battery Eater’s Standard Test it lasted just one hour and nine minutes, but in the Reader’s Test is lasted a reasonable five hours and thirty two minutes. Typical mobile use will result in between four and five hours of endurance.

As with other ThinkPads, our T420s came with Lenovo’s bundled ThinkVantage software. It includes a wide variety of software such as ThinkVantage Connections, which is a replacement to the standard Windows wireless manager. Unlike most such bundled solutions, the software offered by Lenovo is actually better than the standard Windows solution. This is also true for the Power Manager.

Not everything about the included software is great, however. Lenovo includes advertisements for other ThinkVantage services in portions of the bundled software interface by default, which is annoying. In addition, the Virus Protection section recommends Norton Internet Security. It’d be more useful to recommend Microsoft’s free Security Essentials software.

Though thin, the T420s is not so thin that it prevents the use of normal Core i5 processors. That’s a major advantage older and thicker ultraportables have over newer Ultrabooks, and its shows in the performance numbers. SiSoft Sandra’s Processor Arithmetic test achieved a combined score of 43.44, which sets a new record among the laptops we’ve reviewed. The 7-Zip score of 8,247 MIPS is also the highest we’ve yet recorded.

No one has ever mistaken a ThinkPad for a gaming laptop, however, so the lack of 3D gaming prowess isn’t a problem. Overall performance from the T420s is extremely strong, held back only by the mechanical hard drive. Solid state drives are available as an option. We highly recommend them if you’re interested in maximum performance.

The ThinkPad T420s is another example of Lenovo’s stubbornness. Besides the hardware, which is quick, there’s nothing about this laptop that is particularly modern. The entire design philosophy, from the boring matte black surfaces to the beveled key caps, could easily be at home on a laptop built five years ago.

But being stubborn isn’t bad when you have it right. This is a laptop built for people who use their laptops for work every day, and for that use the T420s is perfect. It’s simply a miniaturized version of the T420, offering the same performance in a more portable package. While the T420 might be used around an office, the T420s can be taken nearly anywhere.

You might expect to pay a higher price for the slimmer chassis, but that doesn’t seem to be the case. Right now our review unit can be yours for just $999, while a similar T420 is $949. That’s not much of a difference.

The only weakness of the T420s is battery life. It’s not terrible, but it’s a little below average for a modern ultraportable. The included three-cell extended battery does extend life, but it requires the removal of the optical drive and is an additional cost. It’d be nice if this laptop managed six or seven hours in real-world use without additional juice.

One minor disadvantage can’t spoil this party, however. The T420s is an excellent laptop for business users, and also well worth the consideration of consumers who prefer an excellent keyboard and durable design to flashy aesthetics.