Can someone point me at the blink codes matrix for this LG line?

Have you checked your power supply voltages?...if so what are they?

Take the screen off connect power and watch LEDs if any don't flash its LEDs only needed to change faulty strip if they all flash its probably t con boards.

The Red (L+) and White (L-) wire on the LEFT are for the main Bright White LED. The wires on the RIGHT are for the LEDs. Black (BT=Blue LED), White, (R-= Red LED) and Red, (L+).

NOTE: I mixed up the wiring for the red and blue LEDs so you should be able to flip the black and white wires on the right-hand side but other than that everything should be good.

hi in a dark room shine a flashlight on the screen see if you can still an image if you can, the led or leds has shorted in the panel thanks

shaun

Hi Randy,
Since you have replaced all boards and the TV still does not work, The LED's strips have failed and will need to be replaced.
Check the link for more info about how replace the LED strips.

The backlight is not working. Either power supply or led's

Before backlight, I would always suspect TCON board

Invariably a bad or defective back light inverter in LCD tv.
or LED driver board.

Perform a flash light test and follow the steps as shown in the LCD LED TV Repair No Image Blank Black Screen Flashlight Test How to Fix...

If it was the LEDs, then you should still have some working. My first thought would be the LED driver circuits.

Best of luck.

usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs