Re: LG 65lb7100 Popped backlight broken SMPS

I was given (and repaired!) an LG 65LB7100 with intermittently failing backlight. Basically the screen would go blank after a few seconds or minutes, and the red LED would blink 4 times. I learned a lot about how the power supply board works while fixing my TV, so wanted to share that knowledge here:

There are taps for the 8 LED- outputs, and LED+ and LED-. If the LED current or voltage is too high on any of the 8 strips, the board will disable that strip and flash error 4. Too low gives error 3. If more than 3 strips...