0

Only 2 of the 4 LEDs on my circuit turn on. Please help!!!
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Only 2 of the 4 LEDs on my circuit turn on. Please help!!!

by crohlffff on Wed Apr 23, 2014 6:42 pm

I can only get LED1 and LED3 to turn on. The rest of my circuit is fully functional and those two LEDs can turn off TV's but I would like to get all four working. I have tried fixing the solders, changing batteries, and adjusting everything.
Attachments
front.PNG
Front
front.PNG (411.26 KiB) Viewed 1426 times
backsolder.PNG
back
backsolder.PNG (288.78 KiB) Viewed 1426 times
LEDs.PNG
led
LEDs.PNG (88.63 KiB) Viewed 1426 times
crohlffff
 
Posts: 2
Joined: Wed Apr 23, 2014 6:30 pm

Re: Only 2 of the 4 LEDs on my circuit turn on. Please help

by adafruit_support_bill on Thu Apr 24, 2014 5:51 am

The soldering looks OK. Double-check the LED orientation. A reversed LED would not light.

Re: that last photo - powering it up with all those un-trimmed leads is asking for a short circuit. That could have damaged some of the output transistors.

adafruit_support_bill
 
Posts: 72783
Joined: Sat Feb 07, 2009 10:11 am

Re: Only 2 of the 4 LEDs on my circuit turn on. Please help

by crohlffff on Thu Apr 24, 2014 11:45 am

Is it possible to unsolder the non working LEDs and their transistors and put new ones in and resolder them? I have extra pieces at the parts shop at uni. Or would it not be worth it?
crohlffff
 
Posts: 2
Joined: Wed Apr 23, 2014 6:30 pm

Re: Only 2 of the 4 LEDs on my circuit turn on. Please help

by adafruit_support_bill on Thu Apr 24, 2014 12:44 pm

That is possible. If you have some solder wick and/or a solder-sucker handy, that will make the job easier.

adafruit_support_bill
 
Posts: 72783
Joined: Sat Feb 07, 2009 10:11 am

Please be positive and constructive with your questions and comments.