Question about Kenwood Car Audio & Video

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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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I just fixed my head unit and now none of my speakers are working.. can someone give me advice on what i should try to do next??


HI, would really need more info in what you have done to your head unit and what your current set up is.

Regards,
Carl - www.carheadunit.co.uk

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Hello grammagrisbo, hi your Kenwood head units will show "protect" when there's a problem with the speaker outputs so check to see if the impedance load meets your radio, 8ohms or 4 ohms?. having parallel two speakers on a single channel may cause this dilemma. This might also mean a shorted speaker wire, a blown speaker, or an internal defect in the head unit. Once the condition that's causing the "protect" mode is fixed, the CD player should be back to normal, the next time you turn it on.
If it's staying in "protect", then you'll definitely have to remove the stereo and do something to fix it. Many car audio stores will do system troubleshooting, for a fee. If you want to do it yourself, here's what you need to do:

Pull the Kenwood unit from the dash and disconnect all the speaker wires. power it on and see if the "protect" message displays. If it does, the stereo has an internal defect and will need to be serviced. If it doesn't, then turn it off, and re-connect one speaker only. Turn it on again and see if it will displays "protect" message.

If the radio works with one speaker connected, connect the other speaker to the second channel, you may have now the idea where the problem begun, you will identify the speaker that's causing the problem. There may be a wiring problem or defective speaker in that channel.

If it displays "protect" with a single speaker connected, then disconnect that one and try the other one. If all the speakers cause a "protect" mode, then you're probably back to a defective head unit.

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1 Answer

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If you have high quality after market speakers with a lower impedance (2 ohm and 4 ohm) versus the factory speaker impediance (8 ohm 12 ohm and 16 ohm) your headunits sound out device is probably fried inside your head unit. that or all your speaker leads are fowling out at the same time which i would find that hard to believe. But the good new is, some of the newer head units have a low impediance fail safe, so you could have one speaker that is fowled out that is sending the head unit into protection mode which is muting the output until the fowled wires are cleared. Disconnect your speakers and turn the head unit up playing a cd or something, then connect each speaker one by one. You should have sound. hope this helps.

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