I have two LED stips salvaged from a LED TV. I only have these to LED strips and the ribbon cable that was connected to them from the TVs screen and not other PCB boards or components to help power the LEDs.
I would appreciate if someone can help me figure out how to power these two LED strips. I have very little electrical experience. Most Google searches for Led strip calculation are based on the length of a strip, but these are not the normal led strips from a roll.
The LED stips have various codes printed on them, but the code CL-550-072-V1-L and Google pointed me to this page whith what is seems the exact same model: https://eastern-star.en.made-in-china.com/product/UXyxNGmKYMYf/China-Es-Eled-063-Cl-5500-72V1-R-L-Eled-TV-Backlight-Use-for-Phi-Lips-Cl-55-Inch.html
From that page I gather:
- Power: 0.5W/LED
- Voltage: 3V/LED LED
- Quantity: Rigth:72 LEDs Left:72 LEDs
I could not find information if the LEDs are in series or parallel.
Here is an image of the power connector on one of the LED strips: https://i.stack.imgur.com/uFNwL.jpg
Not the best picture. But each connector has only 1 row of connectors. The connector has a single connector with a pair of (+) and (-) on the strip, and an un-used connector in the center (the cable has no wire there). Additionally what looks like single (+) and (-) exposed for soldering?.
- Does that mean each LED needs 0,17 Amps (0.5 Watts / 3 Volts)?
- How do I calculate the power requirements for the whole strip or both strips?
- Any recommended power supply / driver that supports dimming?
I borrowed a multi meter and measured the continuity of the strip. It seems that a single strip of 72 leds are wired in 4 series sets of 18 Leds each. There was continuity between diodes 01 - 19 - 55 - 72.
Could that mean that my required power supply should be the following?
18 Leds * 3 V = 54 V
72 + 72 Leds * 0.5 W = 72 W
+ 20% overhead = 90 W
90 W / 54 V = 1.66 A