Ive never done that mod but im sure u would use the same contacts as your Volt/Ground contacts u ran to your chip. U see those 4 contact points in a row that u used 2 of the 4 to run power and ground to your chip, well there is another row of 4 contact points next to the one u used for your chip, "may be vertical or horizontal depending on what row u wired to the chip". What u should do is get a voltage reader and set the ground on the volt reader to the known ground "that being the ground wire u ran to the chip". Next use the postive on the voltage reader and tap it on all 4 contact points of the other set row of contacts. If the voltage reader reads 0.0 then u found a ground to run to the ground wire to the led your installing. When u hit another contact point that reads 5.0 or 4.7 (voltage may vary) then thats the contact point u will want to run your wire to power the led. Its hard to explain this in words without a visual ex. but i think u will know what contact points im talking about if you had the controller open and were looking at it. (Remeber if u use a voltage reader the controller must be powerd on to find the 5v power and the ground). Only 2 out of the 4 contact points will be a ground and a 5v power contact point. The other 2 contact points might be a low level voltage like 2.7v or 3.7v somthing in that nature but im sure the led you will be using will want to be powerd with at least 4.7v/5v contactact point. (voltage varies) I hope this information makes some sense to you or somewhat aids u in the right direction in what your trying to achomplish. Im mentioning these other alternative ground and power points to find because i dont think it would be a good idea to draw that kind of power out of the same connection thats hooked up to your chip. Hints dont run your led mod on the same V and G connections your chip is opperating off of. U can get a simple voltage reader at any hardware store for like 5 dollers. There not that big about pocket size and have two metal prongs usually one coated in black for ground and the other coated red for power.