We have the main unit open. We can't see any resistors that are burnt out and we can't specifically locate the resistors for the KDC- MP632U display. Can you please assist? What are the numbers for the resistors?
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Re: No display and trying to find resistors.
They are surface mounted and are located on the top of the board in the front right area with the face of the radio towards you. They do not look burnt or anything like that, they just have some heat stressed solder on them and they are not the shiny silver color that solder is supposed to look like. They are small rectangle shaped about an 1/8 of an inch by 1/4 inch (estimate, not exact size) and are all connected in series. They start at an area that is right next to some white glue that holds another component to the board about two inches from the front of the board and less than an inch from the side of the board. You will see two of them right there and they are all connected to one another going to the front of the board. some are mounted in one direction and some in the other direction. If you would like, I can post a picture for you later today with the proper resistors marked for easy identification. Just let me know by addressing your next post to me.
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I also created a tutorial on fixing faceplates with 2R7 resistors (refer to my tip).
But, your unit will have a different chassis, as the faceplate is also a video display.
First you need to determine if the buttons on the faceplate are operating the various functions. If the buttons are NOT operating, then the faceplate itself (or connection to the main unit) can be considered faulty.
It's highly probable that the RIBBON cable (which connects faceplate to the inside of the unit) may be defective - this is common in some Kenwood units.
Try searching Google or youtube for ribbon cable repairs etc.
Look on line for service manual. Display problem is usually traced to 1, or more, of 3 resistors in the AC supply to the display. It appears that the resistors are supposed to be 1/2 watt but the one I removed from my unit was only 1/4 watt. The resistors are mounted on a small board mounted on the front side of the main transformer - right most board. I had to unscrew the transformer to access the resistor. I looked at voltages coming out of the transformer and the the same voltages leaving the circuit board. There is a 1 Ohm, a .47 Ohm and another that supply AC voltage to different parts of the display. I found one resistor open. Replaced it and I now have an operating unit.
the neptune unit has a control board located on the bottom of unit called a motor controller ...
it is possible the motor controller has failed.. prior to looking at it though check the main control board for failure such as a burnt resistor on board... usually jp4 resistor on board.. if the board looks good then probley going to be the motor controller board.... good luck to you...
where exactly are these resistors located? any idea about the circuit board resistor numbers? sometimes burnt resistors do not go completely bad and is still possible to measure their values. why not take them out and try measuring their values. otherwise u have to b very specific about the rsistor numbers
Check for dc voltage to the display first and last pins should be (-20v to -30vDC) to ground.Then check for ac voltage across the first an last pins of the display should be (3v to 5vAC)
If you are missing them check for open fuses or resistors often on a board on the main transformer. But there are several other possibilities (shorted diode, transistor, capacitor or open resistor).
Only a couple of times have I seen a new display fix it.
Always look for bad solder connections on the display.
As for replacement parts I dont know if they sell to the public or only to service centers.
I don't recommend this, but the resistor you speak of is probably a small fuse. Try jumping out the fuse, then turn on unit for brief moment. If it powers up, fine. Replace jumper wire with 1 amp fuse. If not, take to prof. tech.