Unit comes on no sound - Pioneer DEH-P6800MP CD Player

What's the unit? Hard to help without knowing what you have.

it may have an internal shout somewhere causing the speaker protection relays to kick out..

the is a 24v wire that feeds from your thermostat to your unit, inside there is a contactor that engages, this makes a click sound as it really is a basic mechanical part the makes metal touch metal to allow current to flow through the system, perfectly normal, your hearing the low voltage engage the highvoltage at the contactor.

If throttling sound comes it may from bearings or non alignment of blower wheel. But in your unit I think, it's freon flowing.Some times it may happens from to non serviced unit for long time. Service your unit. Helpful?

sound like the ribbon to the screen is faulty, take the unit to an Alpine repair center.

Did you install this unit yourself? Also is the remote wire (blue) connected properly?

To me if it's spitting out cds and such sounds like a faulty unit.

Sorry for your luck

It sounds like the fan motor needs lubricating. Do you need help with this?

i would suggest checking the wires on the speaker switch board, thats usually the main cause of this problem..but i dont recommend buying pioneers newer stuff

Check for Squelch Codes you can see on the display channel number and sub chanel number this is the squelch code
Both displays must show the same icons
If both are the same, try with and audio accesorie, if works may be your speaker is broken.

I Had That Happen To Me Its A Ground Problem. Check The Negtive Speaker Terminal And The Ground Wire Runing To The HeadUnit This Should Fix It.