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The Lenovo ThinkPad X1 Carbon 4th Gen is a computer released in 2016 with a fingerprint scanner, i7 Processor, and 512GB of SSD. Its model number is 20FB002LUS.

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Will not turn on

Am facing this issue. I have removed the battery and left it overnight. I have pressed and held the reset button. All to no avail. Can anyone help

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Hi @maspav


Try a full power refresh in case it is a corrupted BIOS and check if that resolves the problem.

I realize that you said that you "...have removed the battery and left it overnight. I have pressed and held the reset button.” but sometimes it is necessary to remove the RTC battery (Real Time Clock) from the motherboard as well to reset the BIOS back to its default state.

Here’s the procedure:

a). Disconnect the charger from the laptop if connected.

b). Disconnect the main battery from the motherboard.

c). Remove the RTC battery from the motherboard.

Here’s the hardware maintenance manual for the laptop. Go to p.73 to view the necessary pre-requisite steps and then the procedure to remove the RTC coin cell battery.

When the battery is removed measure its voltage. If it is <2.6V DC replace it. The part number is 00HN933. If you search online using the part number only, you will find suppliers of the part.

d.) Reconnect the RTC battery (or its replacement).

e). Reverse the above steps to re-assemble the laptop.

f.) When the laptop is completely re-assembled, connect the charger and try to turn on the laptop.

If it starts OK there may be a message about the date and time being incorrect. This is normal as the BIOS has been completely reset back to its default settings. Once the date and time have been adjusted the message won’t appear the next time that the laptop is started.

If you had previously changed any user defined settings in BIOS to suit whatever specific hardware configuration that you had for the laptop, then these will have to be set again.

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I have removed the the RTC coin battery. Yet the problem exists. When I turn on the laptop, the backlit keyboard turns on a second and goes off. However the power button and the red light at the back where the Thinkpad logo is stays on.


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maspav sarà eternamente grato.
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