Jamtastic3 Posted March 28, 2009 Share Posted March 28, 2009 Ello BR.I've got a Eurolite Par 64 where the red LED's don't seem to work properly. When you give the can a good knock or two then the red LED's will flicker or come on and then go off after a couple of minutes. So I'm guessing it's a solder issue perhaps...? Anyone got any ideas as to what to look out for as I haven't got a clue as to what could be the suspect componants. Cheers! Link to comment Share on other sites More sharing options...
MrBoomal Posted March 28, 2009 Share Posted March 28, 2009 if the leds come on when you give it a kick, then it sounds like a loose connection. Make sure it is unplugged, take it apart and look for any obvious loose wires or solder joints. Hopefully you will find one. Link to comment Share on other sites More sharing options...
adam2 Posted March 28, 2009 Share Posted March 28, 2009 As above, but note that a defective soldered joint is seldom obvious.If no obvious defect can be found, it might be worth re-soldering any joints assoiciated with the red LEDs. Link to comment Share on other sites More sharing options...
Don Allen Posted March 30, 2009 Share Posted March 30, 2009 A dry solder joint is usually visible with a magnifying glass and a bright work light. If you look at Dry solder joint on Google images you will see a ring or moat around the component lead wire. If you gently wiggle the conponent you will see the lead move as there is a small gap between it and the surrounding solder. The solder will usually be discoloured, not bright and shiny. There are a lot of diferent bad joints but I have found that this is the most common. If you search for dry solder joints on Google you will find pictures and articles on how to fix them. You need to reheat the joint and apply fresh, clean solder. You may need to remove excess old solder before you do the repair. As Adam2 says, rework or resolder any joints associated with the red leds. Link to comment Share on other sites More sharing options...
mutley Posted March 30, 2009 Share Posted March 30, 2009 The first thing I look for in any repair is a broken wire link... I've repaired so many things from DVD recorders to MAC 250s, and the majority of the time, the fault is just a wire that has broken away. Admittedly, I've not seen inside these units to know if they have one, but my guess would be that there are two PCBs; one for the LEDs and one for power and control...? If that's the case, there's probably a bunch of wires (possibly a ribbon) joining the two boards. That would be first point to check. Link to comment Share on other sites More sharing options...
Jamtastic3 Posted March 31, 2009 Author Share Posted March 31, 2009 Cheers for the replies guys!Maintenance day is today so I'll have a look with sharp eyes and a bright light and get back to you. Link to comment Share on other sites More sharing options...
Aaron-Hill07 Posted March 31, 2009 Share Posted March 31, 2009 Also, are all of the LED's out, or is it only a few? Link to comment Share on other sites More sharing options...
Jamtastic3 Posted April 1, 2009 Author Share Posted April 1, 2009 Don, you are a star! Checked out the PCB and there it was: a dry connection on the capacitor for the red LED's. Little bit of a solder and it was fixed. Thanks for the advice. I've got other cans with a few LED's not working in a row, say 3 or four in a row. Could this be another dry solder joint to look into? Link to comment Share on other sites More sharing options...
Jamtastic3 Posted November 20, 2009 Author Share Posted November 20, 2009 Bumping this thread again. So I've got a few LED cans, still the Eurolite's, with some LED's out. Say 3 or 4 in a row. Sometimes when the intensity changes a 'dodgy' row will flicker at various rates and will either go out or flicker really fast at 100%. Any ideas as to how to fix the LED's? Link to comment Share on other sites More sharing options...
Richard CSL Posted November 20, 2009 Share Posted November 20, 2009 if you have leds in a row not working there is almost certainly one led gone open circuit, now I know I am going to get slated for this but this is the quick way to find out which one it is. Identify the row first then in turn short out the leds one by one (breifly) hopefully that will passify the die hards who will probably recomend you short them out with a 1 ohm resistor. when you come across the faulty one the row will light up again. Your next problem is that at some stage you will need to destroy one of your heads to supply parts for the others, because if you start using new leds or even similar ones you will immidiately notice a difference in colour and brightness. so good luck with that. Link to comment Share on other sites More sharing options...
Richard CSL Posted November 20, 2009 Share Posted November 20, 2009 if you have leds in a row not working there is almost certainly one led gone open circuit, now I know I am going to get slated for this but this is the quick way to find out which one it is. Identify the row first then in turn short out the leds one by one (breifly) hopefully that will passify the die hards who will probably recomend you short them out with a 1 ohm resistor. when you come across the faulty one the row will light up again. Your next problem is that at some stage you will need to destroy one of your heads to supply parts for the others, because if you start using new leds or even similar ones you will immidiately notice a difference in colour and brightness. so good luck with that. Link to comment Share on other sites More sharing options...
Jamtastic3 Posted November 21, 2009 Author Share Posted November 21, 2009 if you have leds in a row not working there is almost certainly one led gone open circuit, Care to explain the term open circuit? Link to comment Share on other sites More sharing options...
Modge Posted November 21, 2009 Share Posted November 21, 2009 Care to explain the term open circuit?The opposite of short circuit i.e. infinite impedance, neither current nor voltage pass. Thing of a circuit as a loop. Now open one end and there you have it: open circuit. A precise way of saying a gap in a circuit I guess. One of those must make sense to other people. Link to comment Share on other sites More sharing options...
Jamtastic3 Posted November 23, 2009 Author Share Posted November 23, 2009 Ahhhh ok makes sense now! Cheers for that! Link to comment Share on other sites More sharing options...
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