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I had an extra ATC head on which the display was totally dead. I knew it had something to do with dry soldering. Finally got a chance today to take it apart and inspect it with my magnifying glass (lol). Anywho, as suspected I found dry soldering on the voltage regulator and three resistors as seen in the pics, re-soldered the affected components and no more blank display. Though I'd share it with you guys/gals since I seen people complain about dead display on their ATC controls. Here take a look:
*Sorry forgot to take before pic of the resistors*





 

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Thanks for the info Phil! I was planning to pull my old one apart during my winter break to take a look at it. I bought a replacement from Ross a few months ago just because I didn't want to be without one in case I couldn't fix it. It will be good to have a working backup though.
 

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Mine goes out from time to time but I just move the harness a little and it fixes it.. I replaced the harness with one from a local yard..and still happens..so I'm assuming I have bad solder where my harness connects to the board.. I have my ATC sitting on the seat (extended wiring for a future project).
Hey, I'm doing the fix on this for mine right now, and for the life of me I can not get the fan sped knob off. It's supposed to just pull off right?
Maybe it was punched too hard lol.... yes it should slide right off fairly easy
 

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Hah. I said some less than endearing things about it's mother and then gave it an almighty heave and it finally broke loose. Odd.

Anyway, soldered the 3 resisters and now the display is on again. Another satisfied customer!!
Sometimes they need cursed !! .. sounds like you had a little adrenalin rush lol

Unreal....did you just reheat the solder/pins on the board..or did you remove and replace with new solder.. or just add a little?
 

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This is a great thread. I just fixed the ATC in my buddy's 98 Concorde using the info from here. All 3 resistors had bad solder joints, and one leg of the voltage regulator had a bad joint. Like the other poster said, as soon as I began to resolder one side of one of the resistors it came right off as the other side had a bad solder joint too. I soldered the 3 resistors and the one leg of the volt reg on it and it works perfectly now.

The solder joint looked fine at first, but, under careful, close, examination, with the aid of a hand lens, you could see the tiny gap between the solder and the resistor.

I bought a spare ATC just to be safe, as who knows how long the little fan motor will hold out, or some other component, but it is great to know that I have fixed the original.
 

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great post of the soldering job. I have 5 used ones for the 1st gen corde that i got from the boneyard. All backup units. i had to clean and solder alot of the cold solder joints. Certain ones the rear defroster wouldnt work or lights werent lighting up.
 
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