If completely dead with no indication light then it could be a simple fuse. If TV comes on but with red stand-by light then this could be a power board problem. If so you can send me the board and I'll repair it for you. But first tell me if the stand-by light comes on or not.....
http://tvtechwork.webs.com/
SOURCE: My 42" Vizio LCD Tv Turns on/ wont turn off or display picture.
If you haven't tried it yet, pull the AC plug and let it sit overnight.
Your set and most later ones do have microprocessors in them that can have 'lockup' problems similar to a resonal computer crashing.
If it still isn't responding to set-mounted or remote controls, you may have hada power supply failure.
SOURCE: how do i use my lg flat screen tv as a computer
Hook it up as u would hook up a regular monitor,Turn on the tv power.U the remote see a button said function press it selected PC in.Now u use as a computer monitor.
SOURCE: Have a 42" LG LCD
Sometimes this is an indication of a bad LCD Controller Board (or TCON board). Sometimes it's even just a loose or improper connection with one of the ribbon cables leading into it. When the set heats up the connection expands and makes better contact and functions somewhat better. If you remove the rear access panel you might be able to see the Tcon board. It will probably be under its own metal shield / cover plate. It will have a bunch of wires wrapped in a steel braided shielding cable leading into one side of it through a connector. It will also have 2 or 4 thin flat ribbon cables leading out the other side of it via plastic connectors going to the actual LCD panel. You can google it to see pictures of a Tcon board, it will look similar to the one at this link: http://cgi.ebay.com/LG-6870C-0080D-LCD-DRIVER-BOARD-MDL-42LC2D-UD-APUSLL-/170504013027?pt=LH_DefaultDomain_0&hash=item27b2d4c4e3 You can try flipping up the little plastic retainer clips that hold these flat ribbons in place and gently pulling the ribbons straight out. There will be some gold / copper contacts right on the tips of these ribbons. Sometimes they get oxidized and need to be gently cleaned with a pencil eraser to make them shiny again. Then just slide them straight back in the same connectors and flip down the little plactic retainer clip to hold them in place again. I am assuming of course that the unit is unplugged while you do all this and that the warranty has already expired. If you have any more questions or require additional assistance, please comment back on this page and I will endeavour to help you. Good luck, and if this was at all helpful, please click on the 4 Thumbs Up rating icon above. Thank you very much. Joe.
SOURCE: My LG 42" flat screen TV has sound, but no
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From what you described either the screen driver has failed or the backlight has.
If you get a bright torch and shine it close to screen, you may be able to see a very dark picture.
If you can its the screen backlight that has failed.
Either way you will have to take it be be repaired but you may find the cost rather high and will have to decide if it is worth it or to get a new TV.
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