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LG 47" 5400 Series LED HDTV - 47LN5400 Questions & Answers
How do I know if my backlight on my LG tv is working
Wait until it is very dark. All lights out. Switch on. The screen should perceptibly change from black to dark grey. Perhaps you will see some light leakage near the edges where glass meets plinth.
And there is the T test where you touch the screen with the back of your hand after it's been on for a while. Although LED backlights are cold, they do generate some heat. So a perceptible change in temperature usually indicates that the backlight is functional.
Tv stopped working
Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
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It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
I have lg 47 tv that sud pic stop has sound when you turn on you see a light for sec
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.
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