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Display is out on KDCX590. Someone (tech48) said the problem is not head unit but inside main unit and that something could be soldered...Need directions please.

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I would need to look at the service manual to be sure this model number is the same problem, but I think it is.

If you take the radio out of the car and open the top on it by removing the gold screw on top near the back middle, the top metal plate will pull off and you will see the cd player.
After that you look into the cd player and it is held in by 2 gold screws. One on each corner in the front of the cd player. After removing those 2 screws you will be able to take out the cd deck. Be careful pulling it out, you can damage the ribbon cable connecting it to the main board. Set it over to the left and look into the unit on the main board at the front right area of the board. If you see a series of surface mount resistors, this is the same fix as the other model. If there are not a series of resistors the problem is something else. Maybe the connector for the display or the lcd itself.
Those surface mount resistors need to be resoldered. If you do not know how to properly resolder them, I advise you to take it to a service center to have it done. If you do know how to resolder surface mount components then go ahead and give it a try. Make sure you don't make any solder bridges that could short out another component.
Those surface mount resistors are heat stressed and need a touch of new solder put on them. You can do it without taking the main board out of the unit. They are on the top side of the board in plain site in the front right corner all lined up one after the other and in one spot two that are side by side.
I have fixed this problem over a hundred times, It applies to several models, but I can't remember off the top of my head if yours is also one of them, but it does ring a bell.
I will check in the service manual tomorrow when I am at work and get back with you if it is something different.

Posted on Jun 17, 2008

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The solder on these resistors get heat stressed and stop conducting properly. They just need a tiny little touch of solder. 
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I just followed tech48's solution by resoldering the resistors on the main board.

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Solution from Tech48:

The problem is not the faceplate for any of you, it is inside the main unit. If you know how to solder, you can fix is very easy. First take the top off the unit, there is 1 screw in the back middle. Then take the CD player out. It has 2 screws holding it in at the front corners at the bottom of the CD deck. Use a number 2 phillips and take out the gold screws holding the CD deck in place. Then you can pull out the CD deck, and be careful not to damage the ribbon cable connected from the CD deck to the main board. The deck can just sit up and over to the left to get it out of the way for what needs to be soldered.
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10 Answers

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I read up on this and saw Tech48's post related to a different model. He's the one who deserves the credit. I'm just the rookie who has the soldering iron. However, here's a picture of the 5 resistors that you need to reflow and "top up"

My model is the KDC-MP532U (same as the 532, but with the USB option).

Here's the overall view. The CD-Player is standing on its edge at the bottom. The resistors are on the bottom right by the brass screw post.

81d7a18.jpg

...and here's a close up of the board and the resistors....

f84a560.jpg

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The problem is not the faceplate for any of you, it is inside the main unit. If you know how to solder, you can fix is very easy. First take the top off the unit, there is 1 screw in the back middle. Then take the CD player out. It has 2 screws holding it in at the front corners at the bottom of the CD deck. Use a number 2 phillips and take out the gold screws holding the CD deck in place. Then you can pull out the CD deck, and be careful not to damage the ribbon cable connected from the CD deck to the main board. The deck can just sit up and over to the left to get it out of the way for what needs to be soldered.
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