What’s the matter with the black screen of car navigation

When the car's car navigation is black, first, the driver needs to check the car's power supply voltage to rule out voltage instability, and then look at the car's car navigation cable. If there is no picture on the screen but there is sound, it is a problem with the display. .

The black screen of the car's car navigation can be easily eliminated in the following two ways: 1. When it is not started at all and the screen is not bright: 1. First check whether the car insurance is blown, and replace it after the insurance is broken. Check whether the navigation keys (including the RSET key) are glued and stuck. If stuck, the power cannot be turned on; 2. If the screen is still black and the power cannot be turned on, use a multimeter to measure whether the voltage of b+ and ACC is normal (12V). 2. Only the screen is not bright but the sound is normal: 1. Click the touch screen with your hand to confirm whether there is a response to the touch; 2. If the function is normal, check the problem of the inner screen separately; 3. If the touch is not normal, check the touch screen The circuit, generally the decoding chip or core module does not work or is damaged.