can i do this

Community PCB Design
1

hey i have a ? on an led tv i have found the board which powers the leds, on this board it says led1- led2- nc led+. led3- led4- nc led+. ok, where this comes out of the driver board into the leds, starting with led1- through 4 would it be feasible to install diodes say 1/4 watt inline to each, to prevent voltage feed back into the original circuit. and inject a predetermined current to turn up the brightness on the led strips. say with a pot. we are only dealing with ma. obviously i would run the unit under test to determine its current ma usage. would this not prevent original board damage. of course i would find out the current ratings of the led strips used in this set and stay well under it’s max. hypothetical if rated at 100 ma and using 25, could i not inject say 50 more ma safely.

thanks dboe

2

Regarding the board that controls the leds on the TV, how many volts across VCC and GND are you talking about?

3

I believe these sets carry a dc voltage around 12vdc , I haven’t found a schematic as of yet but i’ll be probing here in the very near future i have to get this done. i didn’t want to go in blind, but i have seen conversion kits that convert from ccfl - led and the power boards are referencing voltage 12vdc . thanks for taking this time to ask

4

I assume the LED are driven with some sort of constant current driver, shouldn’t be too hard to trace the board to find the current sense resistor and parallel it with something to get the current you want