SOURCE: KDC-MP919 No display
You probably have a break in the flexible ribbon cable that goes between the flip face and the mother board. Try partstore.com for a replacement cable.
SOURCE: cd player locked
It has a defective ribbon cable between the face and the motherboard. This is a common repair, but must be done by a repair shop. My shop charges around $60-70 for parts and labor for that repair, to give you a ballpark of what to expect.
SOURCE: No power to Kenwood KDC-4019 faceplate
It sounds like the stereo does not have the "ACC" voltage. It could have blown a fuse. The "ACC" voltage goes to the red wire on the harness and you get that voltage turned on only when the ignition is turned on in the car.
The symptom of the disc ejecting and nothing else works is an indication that only the constant voltage for the yellow wire is connected. Check the voltage on the red wire with the car turned on, if you have that 12 volts at the red wire, then you need the radio serviced.
It is not very likely that the faceplate has gone bad. Just because the radio will not turn on is not an indication that the faceplate is bad. It could be a voltage regulator in the radio or a circuit trace is blown, or almost anything else. There are many reasons that the radio would have the problems you describe and it can only be found out for certain by troubleshooting the radio on a test bench with the proper tools. If you have a multimeter and a power supply I can guide you thru troubleshooting the radio and even email you the service manual in PDF format if you would like to take a crack at it yourself.
Let me know how you want to proceed.
Dave
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