What Causes the Reversing Screen to Go Black?

[Wren]

There are two scenarios for a black reversing screen: 1. Completely black screen and no power-on: Check if the car's original fuse has blown. If the fuse is blown, replace it. Check if the navigation buttons are stuck, including the RSET button, as stuck buttons can also prevent the device from powering on. Additionally, if you're skilled, you can remove the navigation unit and check if the tail fuse of the navigation system has blown. If it has, replace it. If the screen remains black and doesn't power on, use a multimeter to measure whether the B+ and ACC voltages are normal (12V). If the voltage is normal, then the issue lies within the device and requires internal repair. 2. Black screen but sound is normal: Switch to a familiar interface and tap the touchscreen to see if it responds. If the touch function works normally, focus on the display screen. Check if the LCD screen is damaged, whether the LCD backlight driver is functioning, if the signal circuit is normal, if the display decoding is working, and if the core module is operational. If the touch function is abnormal, first suspect a damaged touchscreen and replace it if necessary. Then inspect the touch circuit to confirm there are no issues with the wiring. Generally, the problem could be that the decoding chip or core module is not working or is damaged.