iFixit - Answers With Device "Lenovo Thinkpad X240"

Lenovo Thinkpad X240: Lenovo ThinkPad X240 not turning ON

Thu, 05 Oct 2023 20:00:11 -0700

Why doesn't the Lenovo ThinkPad X240 turn on unless the battery is reconnected after being disconnected once?

The laptop will not turn on unless I disconnect the battery and then immediately reconnect it. I'm seeking advice and insights into why this might be happening. Any guidance or suggestions would be greatly appreciated.

⟐ Answered October 05, 2023 at 20:00 MST

Lenovo Thinkpad X240: How to replace thermal grease/paste?

Thu, 15 Feb 2018 04:17:24 -0700

The CPU in my X240 has been getting up to 90 degrees Celsius and even throttles at times in normal use (youtube, Netflix,etc.), so I was wondering how to replace the thermal paste by yourself?

⟐ Answer accepted February 15, 2018 at 4:17 MST

Lenovo Thinkpad X240: boot problem. Only boot if disconnect CMOS battery

Mon, 19 Jan 2026 05:00:45 -0700

Hi everybody, I got a strange issue with my x240.
If detach the cmos battery work fine, ( also done the advanced hardware test via "lenovo Dignostic Evolution", all ok.)
If I connect the cmos battery, when i connect the power cable the led on the power button blink 3 times then do not power up, do noting.
Try more time also using the reset button.
Is pain using it whitout the cmos being forced to insert data time every time powering on.
Thanks for any help.

⟐ Commented January 19, 2026 at 5:00 MST

Lenovo Thinkpad X240: Why is my Lenovo Thinkpad X240 Screen Black?

Mon, 06 Feb 2023 16:48:45 -0700

I found a decent deal on a Lenovo X240 and found it had no HD and no memory. I found online the specifications for the memory and ordered the “Crucial 8GB (1x8GB) DDR3 RAM 1600MHz PC3L-12800 laptop Memory CT102464BF160B” for and installed a 256GB Samsung SSD drive I had already.

Since I don’t have a power supply with the plug needed, I found Lenovo makes an adapter for the older yellow style barrel plugs and ordered one of those and just received.

I plugged in the laptop with the 135W 20V Lenovo power supply and all I saw is the green LED turn on at the power button and the keyboard backlight flashes once and sounds like the fan is turning. The Fn LED flashes once green and stays green for about 4 seconds and then stays off. The red LED on the top of the screen “I” in Thinkpad stays lit red.

I did the same with the 90W 20V Lenovo power supply though noticed the red LED on the top of the screen “I” in Thinkpad blinked red 3 times when plugging in the power supply and not even powering on or doing anything else.

I just tested without the power supply plugged in and the same effect as with the 135W power supply… only with the external and internal battery.

Prior to plugging in, the power supply… the battery was dead and the laptop did nothing. I’m guessing one of the chargers must have charged one or both of the batteries somewhat.

Finally, I tried to plug in an external known working monitor with no difference when I cycled power.

The screen is black and never does anything in all the scenarios. What are your thoughts?

⟐ Commented February 06, 2023 at 16:48 MST

Lenovo Thinkpad X240: What damage by wrong polarity of the power input?

Sat, 28 Sep 2024 15:50:59 -0700

I applied wrong polarity voltage at power connector and the laptop does not switch on. What damage done, what components to replace?

⟐ Answered September 28, 2024 at 15:50 MST

Lenovo Thinkpad X240: Is it possible to add Bluetooth from another laptop to this one

Mon, 31 Jan 2022 03:29:09 -0700

I have this laptop but Bluetooth doesn't seem to be a feature so i was thinking if I could use the Bluetooth thing from a broken laptop i have to make this one Bluetooth compatible?

⟐ Commented January 31, 2022 at 3:29 MST

Lenovo Thinkpad X240: Why is my pc not charging

Fri, 28 Nov 2025 08:36:11 -0700

When I plug it in it says that it has a low battery error

⟐ Answered November 28, 2025 at 8:36 MST

Lenovo Thinkpad X240: New batteries charging very slowly

Mon, 05 Aug 2024 15:50:46 -0700

I purchased two new batteries (internal & external) from ifixit for my Thinkpad X240. After installing them, I charged them up for 8+ hours. One battery charged from 23% to 46%, and the second battery didn't charge at all from the 23% charge it came with. This seems unusually slow, I am using a 90W power adapter which charged my depleted internal battery from no charge to 100% in two or so hours. (original external battery was malfunctioning, so no base line on that. I tried removing the batteries and re-installing them in the device manager, but still no change in the charge rate. Does anyone have any suggestions/troubleshooting?

⟐ Answered August 05, 2024 at 15:50 MST

Lenovo Thinkpad X240: Máy không có blutooth

Mon, 09 Oct 2023 01:34:40 -0700

Tôi không tìm thấy blutooth cảu máy

Google translate:

The device does not have bluetooth

I can't find my device's Bluetooth

⟐ Answered October 09, 2023 at 1:34 MST

Lenovo Thinkpad X240: What does the push button right next to the LCD connector do?

Wed, 27 Sep 2023 22:11:27 -0700

Just wondering: What does the push button right next to the LCD connector do?

⟐ Answer accepted September 27, 2023 at 22:11 MST

Lenovo Thinkpad X240: Left USB port recognises only 2.0 drives/devices

Mon, 21 Oct 2019 01:17:08 -0700

Left USB port recognises only 2.0 drives/devices despite being a 3.0 port , the right one is 3.0 to and recognises both

⟐ Commented October 21, 2019 at 1:17 MST

Lenovo Thinkpad X240: FullHD display for Lenovo X240

Mon, 08 Apr 2019 03:46:04 -0700

Did anyone tried to install a fullhd display into X240? The one it has is just an HD and mine has a a small defect. I wonder if its possible to use a physically fitting 30 pin eDP panel (I’m thinking about LP IPS). One of the local parts sellers said lenovo has a whitelist limitations in UEFI thus I need to buy the panel it supports.

⟐ Answered April 08, 2019 at 3:46 MST