Disabling LED driver is quite simple. But unfortunatelly you will be no longer protected if something bad happens to LEDs. You will also lose possibility to change backlight level from TV menu.
Firs check if all LED strips are ok.
Now follow these steps:
Step 1. GROUD these pins:
LED_FB
V1a-
V1b-
V1c-
V2a-
V2b-
V2c-
V3a-
V3b-
V3c-
Step 2. CUT signal from ERROR pin
Step 3. (optional) If you want less than 100% backlight remove resistor R261, and put 100 or 200 kohm potentiometer between LED output voltage...