How do I fix........Getting rid of background noise coming from my JVC KWV21BT?

One red Light means your system is overheating, The reason why its overheat is because your GPU chip is getting separated from your motherboard as these console are very common with these issues. You must have a professional handle your system.

Thanks

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You probably have the 959 that has a MOSFET final. It is not recommended that you try to get more power/mod by just turning pots. This can shorten the life of the MOSFET drastically. I normally set the power output to 7 watts and the mod to 100%. This give around 30 watts peak on AM and around 25-30 watts sideband. You need proper test equipment to align the radio.

As far as background noise, this type of radio does have more that others. Make sure the Noise blanker and ANL are turned on. If you are getting noise from equipment in the vehicle, you should take your truck to a good CB shop. They can find out what is causing the noise and fix it.

....Don at NTCB, Inc.

its was trying to tell you it needed cleaning and now a reset has to be done get the manual and reset the unit

Yeah the water that has pooled underneath is being hit by the fan, and throwing it everywhere. Don't be alarm it wont hurt nothing except the noise is irritating specially at night. Getting rid of the water will get rid of the noise.

YES YOUR LAMP OR BULB NEEDS TO BE REPLACED.

Have you been using a flashlight behind the TV. These TV's have a sensor that shuts off the unit when the rear cover is removed (by sensing light). You may have tripped this. I think you can fix this in the service menu somehow but I can't remember.

I'm not an expert but I am a daily operator. First check your ground connection, just because the radio turns on doesn't mean the ground is good enough. If this unit is mobile there are several things you can do to reduce the noise. First you need to find out if the noise is coming in thruogh the antena or the power supply; turn on your radio and vehicle, unhook the antena. If the noise goes away or is reduced you know that it is RF noise. this is interference from some outside source, powerlines, TV, just about any thing that uses electricity or electronics can cause noise. relocating the antena may help. Check you antena connections. Check your SWR. This is only a few of the things you can check.

Managed to clear it myself. After making several cell phone calls to my machine last night and unplugging it over and over, etc. I gave up. This morning I again unplugged everything, reset all the settings and called the machine several times. At first I kept getting the "noise", but eventually I was able to call and leave a normal sounding message. Can't really explain what "cured" it! In desparation I did shake the machine and give it a hard slap, but who knows what did it!

cheak audio setting try hitting the audio buton flip throw the modes it has ok in manel shows how to do factory reset also or in menu in the unit

Sounds like you're not getting voltage on the accessory power lead. This is the red wire at the back of the deck, and it supplies power whenever the key is switched on. It's possible that your vehicle's radio fuse is blown.