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LG 47LN5400 47" LED TV 1920x1080, 120 Hz. HDTV - Page 3 Questions & Answers
My lg 49UH850V screen has gone crazy
Hi Leigh, I can give you some useful advice on your TV. First thing to do is unhook the ribbon cables going from the tcon to the panel boards one at a time ( they will be flat cables) , then power the set on, if you see a normal half a picture on the side that's still hooked up and white or black on the unhooked side you have a bad panel and the set won't be repairable, if you don't get a good half a picture most likely the panel is ok, then there is 2 other possibilities, bad tcon or main board, this 100% will NOT be a power supply issue like the other posted advised. I'd replace the tcon first as it's much less costly than the main, if that doesn't fix it it's the main, unfortunately there isn't a way to test either board without several thousands of test gear, only option is order a good board. Best place to get boards is shopjimmy.com, however if they're out stay away from ebay, a lot of sellers on there get sets that don't work and part them out with no idea of what boards are bad or good, it's very possible you would get another bad board. Hope this helps.
Clock has first number partially out on LG stove/oven
Sad to say, there are many more displays where LED's fail. Lights have limited lifetime. Even when they are not so bright.
The red, yellow or green characters consist of small LED chips on tiny wires inside a number of colored tubes. LED has individual cells mostly connected in series. Therefor one LED element can go out completely, even when it consists of more then one LED. You can repair by interchanging the display unit as a whole but only on the occasion when the display could be removed, the cable has a connector and when made readily available as part.
It is wise to disconnect a device with such a display from the power when not in use. As I understand this display is comprehensive so you better rest your case and do as advised.
NO picture on my tv screen
First off, 126 vdc is the backlight B+ voltage using frame as ground, if you measure across the + and - pins on the plug with it connected you should be seeing a couple volts if the backlights are bad, what's happening is the inverter overload is shutting down the minus side, you will always see the hot side voltage of around $125 vdc if the inverter is working. Very good chance you have bad LED backlights as they are known for failure on this and a lot of other LG model sets.
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