LED Strip Tester
This one is quite simple - a tester for an LED strip for your TV repairs.
I had a bit of trouble with my LED TV. One of the LED strips went out, and my screen went black. Until I shone a flashlight straight into the screen and saw an image I had no idea what was wrong - the LEDs weren't working.
Let me apologise beforehand - I am not an electronics engineer, and I may make a few blunders along the way. I'm happy for any corrections or comments from more experienced makers!
Necessary materials:
3 9V batteries
A resistor
A bit of wiring
Optional\helpful:
A breadboard
Gator clips
Bluetack
Wire Up Your Batteries
My LED strips ran on 27V. For a 32" TV, strips generally have 9 LEDs each, and each LED is a 3V load, and they are connected in series.
If you connect 3 9V batteries in series, you will have a power supply that is just over 27V.
I used bluetac to get the wires to keep in contact with the terminals.
Add a Resistor and Maybe an LED
LEDs don't handle high currents very well, so you need to put a resistor into your circuit.
I used a breadboard for this, but technically you could wire your resistor in series to the terminals of your battery pack. I used a 68k ohm resistor because it was the first one I found lying around. I also found a small blue LED (probably rated at 1.5V) that I put in the circuit. This was to test a strip that had failed short, and was conducting, but not lighting.
Power the Strips
Find the terminals on each LED strip and wire the battery pack to them. Remember, LEDs are diodes and only take current in one direction, so if a strip doesn't work, make sure you wire it in reverse first.
If a strip doesn't light, it's probably broken.