You would try to obtain a service manual. That would have the points to measure and troubleshooting tree. I'm sure as a tech you've seen such manuals.
There are starting primers on Youtube from shopjimmy. I will supply a single example and you can find more.
Hi LG forum, this is my first post and I'm hoping somebody can help me please.
Watching TV last night and the screen went from perfect to a black screen, I still had sound. I tried to restart and unplug the unit a few times and still only sound and no picture apart from the odd dull flickering in the background.
Today I tried the TV, when I press the power button the red standby LED is very dull and is pulsing on of or intermittent.
Any advice would be great guys. I repair and build laptops and computers but I have no idea where to start with TV's. If I need to install a Tcon PCB or any other part I feel capable enough, if it's the panel I'm guessing it's going to cost more that the TV is now worth.
Is their anything I can check, ie ribbons, fuses ect.
Thanks in advance for any help.