Family member has a CCTV system which has some type of issue. It started with all four camera feeds on the display having wavy/off coloured interference showing on the monitor. This slowly deteriorated and now there's no feed coming through on the monitor for any of the cameras.
We tried a different monitor to rule it out, but same result. The DVR's menus etc all display fine. I presume the same fault affecting all four cameras at the same time is highly unlikely, so next the common points of failure are the DVR itself and/or the 12v transformer maybe?
We'll get someone to check out the transformer, and if that checks out, I suppose the DVR is all that's left. Is it a case of just buying a compatible DVR, dropping it in, and setting it up? Are there any things to watch out for, or thing to actually look for.....it's a four camera coax system with an external transformer, as seen in the pics below
^^ I know the battery fault light is showing on the transformer there, but we opened the door on it and there isn't a battery in it as far as I can see, so nothing has changed in it.
Any advice would be great