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How to run the LCD Self-Test - ThinkPad

Steps and instructions to Run LCD Self-Test on ThinkPad - Step by Step Guide

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Steps and instructions to Run LCD Self-Test on ThinkPad - Step by Step Guide

Description

The LCD self-test is for testing the functionality of the LCD panel of a ThinkPad laptop without the need of an external display. The test can be used if the machine shows a blank screen when powered on. Use this test as part of the LCD diagnostic testing. Note: Check the Hardware Maintenance Manual to see if your model supports the LCD Self-Test.

For example: T490s Hardware Maintenance Manual (page 39 and 40  or 45 and 46 on document outline).

Applicable Brands

ThinkPad

Applicable Systems

X Series

  • ThinkPad X390 Yoga
  • ThinkPad X390

T Series

  • ThinkPad T490s
  • ThinkPad T490
  • ThinkPad T590/ThinkPad P53s

L Series

ThinkPad L390 Yoga FO

Solution

Use the following steps to run the LCD Self-Test:

  1. Turn off the computer.
  2. Connect the AC power adapter.
  3. Press Fn, left Ctrl, and the power button at the same time. If the LCD panel displays at least five solid colors in sequence across the entire screen, it indicates that the LCD is functioning normally.
  4. The test lasts for about 20 seconds and then the computer turns off automatically, or press the power button to exit the test.
    Keyboard keys for test

If the LCD displays various images with colors similar to the following when testing, then the LCD is working as expected.

Successful test

Contact Us for support and provide the information from the LCD Self-Test.

Document ID:HT514978
Original Publish Date:02/23/2023
Last Modified Date:11/05/2024
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