kostikas

i have made the installation i have put the cameras i have connected to the internet i have installed the app in my android and it is connected but no picture in the monitor or in my app i ntested the voltage that goes too cameras its ok any help????

what do you mean.remove all cameras from the back?and leave only one bnc from one camera?but i must give voltage to this camera from one of the 4 jacks that are available in the power supply of the cameras.right?

i dont have them near me they look the same but i changed them for sure i put the one to dvr and the other to cameras and viseversa the cables are 18 metres long it was all in the kit https://www.gearbest.com/surveillance-camera-system/pp_1253461.html

i have 4 cameras i bought from gearbest the set https://www.gearbest.com/surveillance-camera-system/pp_1253461.html first i thought i put the bnc that was for camera to the dvr but this was all right the hard dsik is ok now i think maybe was wrong to put the bnc to the back of the dvr while this was powered on i dont know what to do really

i have analog system monitor vga xconnection i see the menus ok i see also in app but its black picture in camera and in app blank i checked the voltage from pak to cameras its 12v.i dont know what is wrong..its impossible 4 cameras to me off.maybe the circuit inside .the plaket of the dvd