There is an old-fashioned Kangjia small picture elf TV at home, and suddenly there is no image, only sound. Please tell me how to do it!

According to what you said, you should press the remote control and listen to the mode alone. You have to pair the remote control first, then find the function conversion key and press it to be OK. If you use the universal remote control instead of entering the direct dial code, you have to search again. When you find that function, it will change back. Try it first. It should work.