I have 4 cameras. 2 work great, 1 sometimes, has lines running from bottom to top. And 1 camera works sometimes and then suddenly lines start running thru,and then picture gets so bad it goes blank and I have black screen... Then as soon as that happens my DVR starts peeping to let me know there is no camera working. I spoke to Lorex tech service, they said it might be static!!!. I changed channels, outlets, have power strip, but nothing... What can be the problem. Pls help.
First make sure all connections (Both at the cameras and the DVR are connected properly, hand tight.
Next I would make sure they system is up and running.
To ,narrow down the problem take 1 of the malfunctioning cameras and hook it up to where a working camera is hooked up (I would strongly recommend putting a label on each Camera (Working and not working)with masking tape and a black marker, same for the cables at the back of your dvr. i;e. Camera 1, Camera 2, Camera 3...ETC) And as for the cameras write known working on a piece of masking tape attached to each and if possible the cable it's hooked up to (just like you did earlier, camera 1 -4)
Now, with everything running, disconnect one of the no working cameras and walk over to one of the working cameras. IF there all the same cameras just unplug at the camera and leave everything esle as is. Now unhook the working camera, set aside, and plug in the non working camera. If this does not fix it, I would look at both working and non working cameras and make sure any switches that may be behind a panel are EXACTLY the same.(dont change the working cameras settings, just non working) If you have to change the non working cameras buttons try it again. Repeat with second non working camera. If the cameras still do not work then they are faulty. If they did work with or without making any changes to the non working camera then your cable ends and/or cable is bad)
IF none of this helps, try going to the back of the DVR and switching 1 known working cameras cable with a non working cameras cable. IF this fixes it then you unit is bad, if not, then camera and/ or cable is bad as discussed earlier. This should narrow down your problem and put you on a path to getting the system working, not that you know for sure where the problem is.
SOURCE: Dell E173FP - After sometime the screen switches off
Mine does this too...honestly if you hit the back of the monitor with some force it will clear up... It sucks but it works for my Dell monitor.
SOURCE: Monitor suddenly goes black
Is this monitor and LCD flat Panel? If so this is due to a bad power supply, an inverter board going bad or LCD backlight bulb blown. When the backlight goes bad it gets just enough power to start up, but when it is on for a long period of time it goes black because the bulb is not stable enough to hold the charge because it is going bad. These bulbs can be changed, but they also can be costly!
SOURCE: Acer AL1916W 19" LCD Monitor Blacking out
This is not a setting or driver issue! The best way to determine this is to connect the monitor up to another device to see if the same thing occurs! If it does then your backlight is in bad shape and it is starting to go bad. It will generate enough power to display some images, but when it continues to be on for a certain peirod of time it goes black. This is common when the backlight is starting to go bad!
SOURCE: HP Pavilion - the monitor flashes off and on
Pls uninstall the video card drivers and reinstall them.
Also pls look for any graphics driver updates from the manufacturer.
Also pls check if the cable from the power supply for the graphics is connected on the motherboard.
Pls check with another monitor if it is doing the same thing.
If the same happens with another monitor, then it is an issue with the video card..
SOURCE: screen displaying a thin white very bright horizontal line.... plz help
problem in vertical section.
1. Solder the vertical ic
2. vertical ic supply capacitor problen.
3. dry points in neck board.
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