Pattern to record: Resolution options are wrong or detection repeatedly fails.

Separate the panel from the source

This guide concerns an LCD monitor with LED illumination. Compare the monitor’s own on-screen menu with an external image; a defect visible on the menu is different from a problem limited to one cable or source. One possible explanation is that the source cannot read the monitor's supported modes correctly.

Display-path checks

1. Test another source and cable, open the on-screen menu and separate panel, backlight and input faults.
2. Read identification data through multiple known inputs and sources.

Handling and electrical safety

Monitor power boards can contain hazardous voltage and retained charge. Forcing unsupported timings can obscure the original fault.

Image and input verification

If the checks support this cause, repair the communication line or restore correct monitor firmware data. Verification should cover all inputs, native resolution, brightness range, sleep wake and extended display.

For an assessment of your desktop monitor, contact AEPC in Burswood or call 027 908 8880. Provide the model and the conditions that reproduce this problem. Workshop visits are by appointment.