Re: cctv camera no image

[robertlbass@xxxxxxxxxxx]

On Oct 29, 4:53 pm, resisto...@xxxxxxxxx wrote:
> On Oct 29, 2:21 pm, e.dav...@xxxxxxxxxxxx wrote:
>
> > What could be the cause of a cctv camera suddenly having no image?
> > There is still a power LED coming on, but no signal coming through.  I
> > have tested the voltage on the BNC output and it shows 0V.
>
> Well you should not have any voltage on the BNC connector.

That is incorrect.  At the BNC connector you will typically see about
1V, P/P.

> You should
> have 2 conductors for power. But if the led is on then you have power.
> So either the BNC end went bad especially if it is those junk twist on
> ones

That is also incorrect.  Twist-on connectors have been in use for
years without failing.  You have to strip the cable correctly to use
them effectively.  Soldered or press-on types are better for high def
signals.  However, very few CCTV systems are HD.

> or something blew the camera. I have had that happen twice in the
> last couple weeks

That or a loose connection are the most likely culprits.  If there are
other, functioning cameras in the system, swap the bad with a known
good one.  First try swapping BNC inputs at the DVR or monitor end.
If the problem remains the same the DVR or monitor has a problem.
This isn't as likely but it's the easiest thing to check so do that
first.

If the problem follows the swapped input, restore it and swap the
camera with a known good one.  If the problem stays the same it's a
bad cable or BNC connector.  If the problem follows the swapped
camera, then the camera is at fault.

Regards,
Robert L Bass
www.BassBurglarAlarms.com