A technician replaced a broken LED screen on a mobile computer.
The operating system can be seen perfectly on screen, but the touch screen is non-responsive.
Which of the following are the MOST probable root causes for the given failure? (Choose three.)
Click on the arrows to vote for the correct answer
A. B. C. D. E. F. G.ACD.
The correct answers are A, B, and C.
A. The hardware replacement used is a non-touch-screen version: This is a possible cause if the technician replaced the screen with a non-touch screen version, which would mean the hardware required for touch functionality is not present.
B. The touch screen must be calibrated after a replacement: Calibrating the touch screen is essential for proper functioning. This process aligns the touch screen with the device's operating system, and if not done correctly, the touch screen may not respond properly.
C. The digitizer cable is not seated properly on the motherboard: The digitizer cable is responsible for transmitting touch signals from the screen to the motherboard. If the digitizer cable is not properly seated or is damaged, the touch screen will not function.
D. The new touch-screen drivers must be installed: This is an unlikely cause since touch-screen drivers are usually installed automatically by the operating system. However, if the operating system is outdated or the drivers are not installed automatically, this could be a cause.
E. The replacement part is dead-on-arrival: This is also an unlikely cause since the operating system is seen perfectly on the screen, indicating that the replacement part is functional.
F. The LCD panel firmware must be updated: This is an unlikely cause since firmware updates rarely affect touch-screen functionality.
G. The grounding screws are not securely attached: This is also an unlikely cause since grounding screws are not related to touch-screen functionality.
In conclusion, the most probable root causes for the non-responsive touch screen are A, B, and C.