In what order should components be checked if the LCD has passed the BIST but there is still a video problem?

When diagnosing a video problem after the LCD has passed the Built-In Self Test (BIST), it is crucial to follow a logical sequence in checking the components to effectively identify the root cause of the issue.

Starting with the LCD cable is appropriate because this component is responsible for transmitting video signals from the system board to the LCD. If there are any connection issues or damage to the cable, this would directly affect the display output.

Next, checking the inverter board is important, particularly if the screen is dim or not displaying any image at all. The inverter is responsible for providing power to the backlight of the LCD. If the inverter is malfunctioning, the screen may appear black or very dark even if the actual image data is being sent correctly.

Finally, examining the system board is essential as it is the source of the video signal. However, by the time you reach this stage in your troubleshooting process, you have already ruled out the more likely causes (the cable and the inverter) that could lead to a video problem.

Following this order allows for efficient troubleshooting, starting with the simplest and most commonly problematic components before proceeding to check the more complex and integral part of the system.