Smd led types

[angelos]

Good day all,
I did some research on this topic but i cannot get suitable information. Is there a comprehensive web site that has information on SMD LED datasheets.
For example, i have backlight failure on a tv and order the exact same edgelit strip then when i put them in the set and start up the power supply shuts them down immediately. If i fix the old strips then it works fine. If i use a LED tester then if i power a segment (4 x 12) the tester voltage settles down on 40.4V (original) and the replacement strip (44.4V). So that should mean that their forward currents differ. I guess its impossible to know what LEDS the supplier of the back lights used. Communication with chinese suppliers is non existent on aliexpress.

[diif]

Re: Smd led types

LEDs are either 3v or 6v. I compare their look under a microscope and the light they give off with a spectrometer. There are data sheets for smd LEDs but with no way of identifying what LED is on what strip they seem pretty pointless IMO.

[angelos]

Re: Smd led types

So why are the chinese replacement leds causing the power supply to trip whereas the original is not doing that? Also when i connect my LED tester there is a difference between the two strips. The tester drive voltage is slightly different between the original and replacement.

[diif]

Re: Smd led types

Unless it's one of the latest LED testers that outputs 300mA it is just a quick test tool carrying out a part test. LEDs need the correct voltage and current if you want to test fully.
With your replacements, perhaps you are fitting the wrong voltage LEDs ? Maybe detail your strip and the replacements so it can be figured out, it's hard to say without knowing the details.

I use the LED tester for a quick test then use my bench power to test properly.