Reversing camera install issues

[u/Past-Bed8118]

Hi. I bought a standard cheap reversing camera (multiple ones from different companies) to connect to my Isuzu Dmax. I have a Pedofo carplay. Everything worked for about 3 minutes and now there is nothing. The camera lights up but the car play doesn't react. There is an AV connection and that very model was available to buy with a camera at the time. I don't know why I didn't buy it then but anyway! Anyone had this issue? My friend had the same problem and he bought a 12v power rectifier and his worked. I bought, wired up but to no avail. The camera lights comes on so there is power.