Knowledge Base

How to Run the Laptop LCD Built-in Self Test

Table of Contents

  1. How to Run the LCD Built-in Selft Test from PSA / ePSA Diagnostics
  2. How to Initialize the Stand-alone LCD BIST Diagnostics

How to Run the LCD Built-in Selft Test from PSA / ePSA Diagnostics

To run the Pre-boot System Assessment (PSA) diagnostics and obtain the PSA error code, perform the following steps:

  1. Shutdown the computer.
  2. Press and hold the Fn key, then press and release the power button. Release the Fn key when the message "Diagnostic boot selected" is displayed in the upper right corner of the screen.
  3. Release the Fn key.
    • The PSA diagnostic sequence begins.
    • The system produces a number of alert tones.
    • You will now see a series of horizontal and vertical color bars across the entire screen.
    • You will be prompted with a question if you see the color bars. Press N to forcibly invoke the LCD Built-in Self Test
      You will need to respond to the question within 30 seconds.
    • Diagnostics of the remaining components within your computer will continue.
  4. Note the sequence of beeps or error codes.
PSA diagnostics will prompt for input during some tests. The resulting error message does not necessarily indicate hardware failure.

For example: User input is required during the color bar test. Failure to input a response will eventually result in a timeout error: 1000-0333 Graphics test timed out waiting for keyboard response. This does not indicate a graphics failure has occurred.

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How to Initialize the Stand-alone LCD BIST Diagnostics

To run the LCD BIST (Built in Self-test):
Press and hold the D key on the keyboard while pressing the Power button, then release both at the same time.

This will initiate A grey screen, then Red, then Blue, then Green then White, to allow you to inspect the entire LCD for color purity on each screen and to better identify defect such as cracks in the LCD or stuck pixels that may not be apparent in a normal viewing mode.

Systems built after mid-year 2012 may also display a white screen with black text to help identify focus/clarity issues.

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Article ID: SLN131497

Last Date Modified: 05/25/2015 01:16 PM

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