LG 42LN5400-ZA TV stopped working

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.


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As a laptop technician, repair person.

Post was last edited on August 2, 2017 4:06 AM PDT

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Fixed (I think)

I couldn't obtain a service manual for free. I tried all the voltages on the PSU which were fine, checked for dry joints.

Thought I'd cook the BGA chip for a couple of hours under an electric heater to re-ball any broken solider and it seems to have worked.

Thank you for the input and guidence, Seems TV's are just a simple computer inside but no harm in coming over here to ask the experts before I started pulling the TV apart Happy

Thanks again.


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