How to know a bad sattelite dish?

Step 1
Turn on your satellite receiver and your TV. Make sure your TV input
selector is set for the input where you are connected. If you don't see a
picture at all, check the cables between the receiver and the TV. If they
are good and you still see no picture at all, your receiver is bad and
you must get it fixed before you can check your dish. If you see a
warning that you have no receive signal, your receiver is OK and you
can continue checking.
Step 2
Look outside at the weather. A heavy thunderstorm between your dish
and the satellite may cause a temporary loss of signal, even though it
may not be raining where the dish is located. If there is a storm, wait
until it passes.
Step 3
Look at your satellite dish to see if it may have been knocked out of
position by a heavy wind or a falling object. If the dish seems to be out
of position but not broken, call your satellite company to have it
aligned. If it is bent or the feed horn is bent or broken, the dish is bad.
Look from the dish in the direction of the satellite to make sure no
trees have grown into the path, or new houses or buildings have
blocked the signal.
Step 4
Look at the cover on the feed horn to see if it is cracked or broken.
Water or moisture inside could damage the LNB. Some have a
translucent cover that may show condensation on the inside that could
cause a failure.
Step 5
Check the cable connections at the receiver and the dish. Remove them
and look for a bent or broken center conductor, a damaged connector
that doesn't make a ground connection, or dirt or corrosion that could
block a signal. Replace any bad connectors or call your satellite service
company to do it.
Step 6
Check the cable for cuts, breaks or crushing. Follow it for its entire
length and look carefully. A crushed cable could have the center
conductor shorted to the shield and block the signal. If the cables and
the receiver are OK, and the dish is properly aligned and not physically
damaged or blocked, you probably have a bad LNB in your dish and it
needs to be replaced.

Hope it helps...

Good for the learner

Thanks for the info.

Good for everyone