Hello,
After 2 years of no issue, my reverse camera from China started to act up in the morning, the image is black and whine and flickering. Most likely due to fluctuation in the voltage from the car, because later in the day, it works just fine.
A solution is to install a 12v  power filter on the + and - but i have no idea exactly where these wires are. The camera is plug and play, no wire cutting so the power comes straight out of the MIB 2 box, I got a picture of where the + wire is from the Chinese guy, will attach a picture but would like some one that knows the wiring loom to confirm this is + and where the - might be.

I’d like to know this, too, because while mine doesn’t flicker or whine (sic) it does tend to choose when to work, giving a blank black screen when it chooses not to.

 

So thanks for posting the question