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Why can't I get my LEDs to light?
Posted: Mon Jan 31, 2022 10:09 am
by stu_the_flat
I bought two 6.1s boards. Both work well with the current LED's that are on the tanks hull. however they come supplied with LEDs in the packet, that I need to get working but I can't. I am plug them into channel 2 (aim light) and 4 (Head light) I've tired both polarities and holding G + left stick forward encase they where turn off.
They both don't want to light, what else can I try? Its two LED's so I can't imagine that they are both faulty.
Any help appreciated.
Re: Why can't I get my LEDs to light?
Posted: Mon Jan 31, 2022 12:56 pm
by john1970
It possible that they are for the IR system emitter bulbs
Re: Why can't I get my LEDs to light?
Posted: Mon Jan 31, 2022 1:00 pm
by lmcq11
Your control board/LED setup might require a resistor on the + wire.
Re: Why can't I get my LEDs to light?
Posted: Mon Jan 31, 2022 1:11 pm
by Jofaur86
Hello,
Found on this Forum, post "electronics HL" by "Jarndice" may I quote? may be the solution?
by jarndice ยป Thu Mar 11, 2021 3:39 pm
A few points here, LEDs have two wires coming out the back,
One is longer than the other, knowing which is which will tell you which is positive and which is negative,
The Heng Long Version 6.0 control board has a light selector switch so merely plugging in to the correct socket will not work if the switch has not been activated,
Indeed most secondary services on the Heng Long version 6.0 MFU are switch activated so just because everything is plugged in does not mean it will immediately come to life, it has to be switched on.
Re: Why can't I get my LEDs to light?
Posted: Mon Jan 31, 2022 1:28 pm
by stu_the_flat
john1970 wrote:It possible that they are for the IR system emitter bulbs
Doh! Yes you are 100% correct! I'll go and hide in shame now!
Re: Why can't I get my LEDs to light?
Posted: Mon Jan 31, 2022 5:42 pm
by Jofaur86
Re: Why can't I get my LEDs to light?
Posted: Tue Feb 01, 2022 3:42 am
by Herr Dr. Professor
Uh oh: wise guy alert! "One is longer than the other, knowing which is which will tell you which is positive and which is negative." Am I missing something (as usual)? Which polarity is the longer (I'll figure out, then, which polarity is the shorter."
Re: Why can't I get my LEDs to light?
Posted: Tue Feb 01, 2022 9:23 am
by tankme
Longer leg of the LED is the anode (+) and the shorter leg is the cathode (-). If the legs have been cut you can still tell which is which by looking at the plates inside. The cathode is the larger plate looking down through the top of the LED. The cathode can also be designated by a flat spot at the base of the LED on the cathode side.
Most LEDs are around 3V. You can rig up a simple tester by connecting them to a 3V battery source (2 AA batteries in series). I wouldn't try to test them off a main 7.4V battery or will more than likely blow the LED. They make a nice popping sound and smell really nice when they go... If you suspect it's an IR LED, you can look at through the video of your phone. It can see the IR light.
Not enough current or voltage can cause the LED not to light. Too much voltage will blow the LED.
