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hi, seeing that your kenwood showed up "protect" you may have an audio circuit/amplifier fault within the unit. try resetting the unit to see if unit comes "on" again. if the unit comes on and protect flashes again, then you definitely have an internal audio circuit fault. if not then check all power connections(yellow and red wire voltages, as well as ground connection), as well as the condition of the face pins!
HAVE YOU REPLACED UNIT? IF YOU HAVE THEN IT COULD BE THE SWITCHED / CONSTENT FEED BEING AROUND THE WRONG WAY, YOU CAN TEST TO SEE IF YOU HAVE A CONSTENT FEED WITH IGNITION OFF ON ONE OF THESE, AND A FEED ON THE OTHER YOU TURN IGNITION ON, THE THESE ARE NORMALLY RED AND YELLOW SWAP THEM ROUND, GROUND/EARTH IS BLACK, FUSE N HEAD UNIT NORMALLY BEHIND THE PLUG THAT FITS IN THE HEAD UNIT
it's a Canadian Kenwood. http://inform3.kenwoodusa.com/manuals/KDC-MPV8025.pdf
I had the 925 purchased from Ebay, but I sold the car with it.
it's probably the ribbon wire broken between the face and the unit. I know that on Ebay some they use to offer a repair for these type of units.
I have worked on many of these radios and there is a lever that contacts switch to determine position of face this lever wears out and switch does not operate properly causing radio to lose its mind. This is usually the cause of this failure unless flip gears have been damged somehow. contact firstname.lastname@example.org for additional info
the kenwoods with the motorized face platesdevelop one problem with time. the flexable ribbon cable between the main unit & the face plate. as the face open & closes, over time wares out the cable. problem consists of face plate not opening/closing, display missing & and/or some or all buttons not working. note these can also be intermittent problems. typically the part number is located on the cable itself on the side where it pluggs into the main board. since you have a service manual, you should verify it in the manual.
First check the power fuse as well as the stanby or always on fuse. then if that does not work Try to disconnect the power and standby line and let the unit reset . This should be done for at least an hour or so.. Good Luck