If you have a LG SmartTV read this. If not read always, you can avoid unexpected costs.
Step 1: Problem: My TV Go on and Off Permanently
Please excuse me if I have errors in writing. (I speak spanish)
A few days ago I had problems with SmartTV LG 42 "with two years of use. He began to restart every 1 or 2 minutes. If pressed the off button, it restarted again. After this disconnect power and I went to the service, but when conte my problem, tell me that the power supply is blocked. I think US $ 40 (equivalent) for diagnosis and US $ 120 for the power supply can be a lot and started to open (I'm related to electronics)
Never before was opening an LED or LCD TV, but when I see the cards, I detected some loose screws. As? ¿LG Electronics leave or without locking screws loose?
First check the power supply (card cafe) and has 3 screws loose .... if all screws are grounded, it could be that?
Then I see other loose screws on the card signals (red, HDMI and tuner), and also connected to ground with screws ...
At this point I start to tighten the screws, being careful not to touch the capacitors to avoid risks, use latex gloves as an insulator.
I check all connectors and screws. TV plug in the mouth down on a table and watch you turn and I connect via WiFi .... it works !!!
I really thought I had saved $ 160, until the last weekend, where my nephew arrived with his TV (like mine) to accompany him for service. Check it quickly and the situation was the same (loose screws).
At the end of the week it had saved $ 320 on TV's and in gratitude my nephew invited me to dinner ...
All thanks to the defect of this TV. Poor quality control? Save US $ 0.1 in locking bolts?
I think all LG Smart TV may have this problem, and eventually those of other manufacturers, driving signal chassis with loose screws
These screws can loosen due to temperature after the TV. Improve your TV using threadlocker, the cost is US $ 3-4
If you have a Smart TV LG open the back side, and apply threadlock to avoid future problems, and unexpected costs.
Have a nice work!!