We have a LG 50UH5500-UA which has stopped working.
When first plugged in, press power button... LG logo appears for less than a second, then screen goes black. The red light at the power button also comes on, turns off, then blinks twice.
Watching from the back with the cover off, the backlight quickly flashes on and then off. A red light on the main board under the heat sink turns on and then off, as does the red optical port light. Subsequent attempts at powering on the TV without unplugging it first will show the same except the backlight never comes on, and the logo doesn't appear. If I unplug the TV and let it sit for a minute, then next attempt at powering on will produce the brief logo again.
Have replaced power board. Cleaned and reseated connections. Tried flashlight test, could not see any picture. Tried baking main board for 10 minutes at 385F.
No burns or obvious issues visually apparent in TCON or main board. Cables all seem intact.
Any ideas where to go from here? I've seen suggestions for similar issues for both main board and LEDs...
Pictures are attached and also here.
Thanks!
When first plugged in, press power button... LG logo appears for less than a second, then screen goes black. The red light at the power button also comes on, turns off, then blinks twice.
Watching from the back with the cover off, the backlight quickly flashes on and then off. A red light on the main board under the heat sink turns on and then off, as does the red optical port light. Subsequent attempts at powering on the TV without unplugging it first will show the same except the backlight never comes on, and the logo doesn't appear. If I unplug the TV and let it sit for a minute, then next attempt at powering on will produce the brief logo again.
Have replaced power board. Cleaned and reseated connections. Tried flashlight test, could not see any picture. Tried baking main board for 10 minutes at 385F.
No burns or obvious issues visually apparent in TCON or main board. Cables all seem intact.
Any ideas where to go from here? I've seen suggestions for similar issues for both main board and LEDs...
Pictures are attached and also here.
Thanks!
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