Why does the display screen not light up but the reversing camera does?
3 Answers
Reasons why the display screen does not light up but the reversing camera does: 1. Loose display screen cable: A loose or poor connection in the display screen cable can cause this issue. First, check the cable. If the screen is damaged by external force, there may be cracks, and the display may show distorted images. 2. USB usage issues: For example, some low-quality USB drives may cause compatibility and data transmission problems, leading to poor operation of the host. Or there may be too many non-multimedia files in the USB drive/hard disk. Below is relevant information about car display screens: 1. An important component of the car audio-visual system: The car display screen is a crucial part of the car audio-visual system, functioning similarly to a color TV in a home theater. It can receive in-car audio-visual signals and play them back on the display, while also being usable on similar moving vehicles, making it convenient for use while the car is in motion. 2. Other functions of the car display screen: Due to the unique nature of in-car use, car display screens often have additional functions besides playing programs. For example, when connected to an in-car camera, they can automatically display the scenery behind the car when reversing, making parking easier. Additionally, they may include other features like small speakers, small lights, etc. Given the limited space inside a car and the constantly changing environment while the car is moving, in-car display devices may also come with functions like automatic backlight adjustment, anti-glare, automatic angle adjustment, etc., to adapt to the car's specific needs.
I think this issue is most likely caused by a problem in the main power supply circuit of the display screen. The reverse camera uses a separate independent power supply system that automatically activates when shifting into reverse gear. However, the screen displaying navigation or music usually requires the multimedia head unit to function properly to illuminate. Check if the car audio fuse has blown or if the wiring harness connector has become loose. Last time, my colleague's car had a similar issue where the screen wouldn't light up but the reverse camera still worked normally—it turned out the head unit wiring harness was disturbed during dashcam installation. If you've recently installed any other electronic devices, first investigate whether the new equipment is interfering with the vehicle's original wiring.
It's most likely a malfunction in the multimedia module. The screen display in Hyundai vehicles relies on the host system, but the reversing camera is an independent system triggered directly by the reverse light signal. Try restarting the car's system by holding the power button for ten seconds to force a reboot. Moisture seeping into the dashboard during car washes can also cause poor contact—I've seen cases where the screen interface oxidized. Pay attention to whether the logo lights up during startup; if the brand logo displays, it means the backlight is functioning normally, and the issue lies in the signal transmission part. For safety, it's best to take it to a 4S shop for a computer diagnostic check.
