TV Repair Tips

Make Model Problem
LG 50LB5900-UV BLACKLIGHTS COME ONTHEN TURN OFF STILL HAD SOUND
LG 47LB6300-U, 49LB5550-UY, 60LB6000-UH, 50LB6000-UH, 50LF6090-UB, 50LB6100-UG, 47LB6100-UG, 50LB6500-UM, 50LB6300-US, 50LB5900-UV, 47LB5800-UG, 50LF6100-UA, 50LF6100-UA, 47LB5900 No LEDs - sound but no picture - picture there when using an external light