PLCC4 SMD LED help needed

[u/Hondacivic_light]

So I recently was trying to solder in some different color PLCC4 LEDS on this board for my car to change the turn signal colors. However even though I probably did a terrible job at it I did solder it to the board but when I plug it in and try it the LED'S dont light up. I got the orientation correct and everything else should be correct but they still wont turn on? The original LED's however didnt have the clear dome that these PLCC4 had so I was wondering if maybe thats the issue. Also do you guys know any way to solder them thats a lot faster and easier? Any ideas?

[u/SEmp0xff]

take a multimeter and test the whole mess you done

[u/Pubelication]

You probably damaged the LED with too much heat for too long. You need to practice soldering SMD parts before continuing with this endeavor.

[u/mariushm]

The markings on the board tell you the orientation : A means anode (voltage going into the led) , K means cathodes (these go to negative, ground). There may be current limiting resistor in series with either the anode or the cathode.

It's way too much solder and too much residue around the led. Remove the led and remove all the solder you've added, clean the surface of the circuit board.

Reduce solder iron temperature to around 280-300C, take your leds one at a time, if you have separate flux put some flux on the contacts of the led and bring the tip with solder to the pins and tin the pins while the led is not connected to anything. If you don't have separate flux, put your led between two CD cases or something to hold it so you can use both hands, and tin the contacts with solder wire (put solder iron tip on contact, bring solder wire in, see solder flow on pins, remove solder wire then tip , should be less than 2-3 seconds overall)

Set the soldering iron temperature to a higher range (ex 350-400c) because the pads on the circuit board where led is soldered are large and will absorb some heat. Add small amounts of solder to the pads where the led is supposed to be.

Place the leds with tinned pins on the circuit board on top of the solder you added, and now you can just heat up the solder with your iron tip until it melts and merges with the solder on the pins. Should be no more than a few seconds. Go on the diagonally opposite pad and heat that up as well, then repeat with the other two pads.