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Kenwood X590 - LCD Display Gone

Tech 48, I've read your instructions regarding how to fix this and I plan on doing this fix myself as I've already had the HU at Kenwood for the same problem about a year ago. I went without my HU for about 3 months! Not this time.

1. I need to know what kind of solder you would recommend for this fix. I used to work at an electronics plant several years ago and we used every kind of solder back then depending on the board that we were working on. What solder size (i.e., thickness) would you recommend? Should it have flux?

2. Do the resistors you mentioned (i.e., the ones with reference code R43, R44, R46, R47, R48, R49, R50, R51, R55, R57) say "2R7" or "2.7"? I'm looking at the manual right now and it suggests that they say "2.7" as opposed to "2R7". I just want to make sure I know what I'm soldering before I see it.

3. Lastly, should I resolder ALL of these resistors or just a select few of them?

Thanks for your help. Ryan

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Resolder all the resistors. They say 2.7 in the manual, but the print on the component is 2R7. For solder use 60-40 rosin core with flux. The thickness should be a small diameter, but most any solder will work, you will only be putting a very small dab of solder on each solder connection. Just enough to make it melt and reflow, no more. This is no guarantee that it will fix your unit, but it is the most common cause. You may find that the display being out for yours is something different. If you have a voltmeter you can put the radio on a bench and check the voltages (DC) on those resistors when it is powered on. You will need a small power supply capable of about 3 amps to power up a car stereo. I don't remember what the voltage are supposed to be, but you should start at one end and have a high voltage and as you go from one resistor to another, the voltage will go down in equal increments. It is a voltage ladder and with all the resistors being the same value, you should have the same voltage across each resistor.

Posted on Nov 24, 2008

  • lmcclymonds Sep 09, 2011

    Will this fix work on an X-715? Same issue, everything works but no lights or display.

    Thanks you


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