Pattern to record: Lower settings work while native high-bandwidth modes flicker or blank.

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 cable cannot carry the selected resolution, refresh and colour format reliably.

Display-path checks

1. Test another source and cable, open the on-screen menu and separate panel, backlight and input faults.
2. Calculate required bandwidth and compare a short certified cable.

Handling and electrical safety

Monitor power boards can contain hazardous voltage and retained charge. Repeated reconnects do not repair a marginal or mislabelled cable.

Image and input verification

If the checks support this cause, use a verified cable and configure a supported signal format. 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.