If the power supply is connected to the car accessory circuits, but the engine is not turned on, switch the ignition key to “ACC.” 
Check if the fuse is blown. Replace with a new fuse if necessary.
Check if the POWER button on the front of the player is set to ON.
Check if the monitor or TV is switched ON.
Check if select proper mode has been selected (such as Disc Play mode or AV mode).
Check the video connections.
Check the disc for fingerprints and clean it with soft cloth, wiping from center to the edge.
Sometimes a small amount of picture distortion may be present. This is not a malfunction.
The disc format is not the same as the 
The disc format is not the same as the 
Be sure that the disc label faces up.
Clean the disc.
Check if the disc is defective by trying another disc.
Check the audio connections.
Aim the remote control directly at the sen- sor on the front of the player.
Remove any obstacles which may inter- fere with the signal path.
Inspect or replace the remote control battery.
The disc format is not according to the 
Check the digital connections.
Check the Digital Audio menu to make sure that the digital output is correctly set. 
Check if the audio format of the selected audio language matches your receiver’s
Press Reset button on the front panel of the DVD unit.
BV7300 specifications
The Boss Audio Systems BV7300 is an impressive multimedia car stereo designed to enhance your driving experience with its array of features and advanced technologies. This double din unit not only supports a wide variety of media formats but also integrates seamlessly with today's digital lifestyle.One of the standout features of the BV7300 is its large 7-inch LCD touchscreen display, which delivers crisp and vibrant visuals. The touchscreen interface is user-friendly, allowing for easy navigation through your music library, settings, and other functions. The display also includes a customizable illumination feature, which enables you to match the stereo's lighting with the ambiance of your vehicle’s interior.
For audio playback, the BV7300 supports multiple formats including MP3, WMA, and WAV, allowing you to enjoy your favorite tracks without limitations. The unit is designed to work with USB flash drives and SD cards, making it easy to access your entire music collection. Additionally, the Bluetooth technology built into the BV7300 allows for hands-free calling and wireless audio streaming, enhancing both convenience and safety while driving.
An important aspect of the BV7300 is its compatibility with various smartphone platforms. The stereo supports both Apple CarPlay and Android Auto, enabling users to connect their smartphones to access navigation apps, music streaming services, and more. This feature elevates your driving experience, allowing for hands-free control of your devices directly from the stereo.
The BV7300 also boasts a built-in AM/FM radio tuner with 30 programmable stations, giving you access to your favorite radio shows and music. The unit is equipped with an equalizer and preset audio settings, letting you customize the sound to your liking.
In terms of connectivity, the BV7300 provides rear view camera input which enhances safety by allowing drivers to see what's behind them while reversing. The unit also supports a range of auxiliary inputs making it easy to connect other devices.
In summary, the Boss Audio Systems BV7300 is a feature-rich multimedia car stereo that combines functionality with advanced technology. With its large touchscreen, Bluetooth capabilities, smartphone integration, and customizable audio settings, it offers a complete solution for those looking to elevate their in-car entertainment experience. Its user-friendly design and compatibility with various media formats make it a versatile addition to any vehicle.