Question about LG 42LC7D-UB Television

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Replace main board on LG 42LC7D-UB

TV went dead and called service tech. he told me that I need new main board.... this will cost me around $650 plus $109 for in home service... what a guy....... what a guy......
but...
I can not find the main board.
can someone help me to order online or from store?
thanks

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  • Anonymous Mar 27, 2014

    Take to long tk turn on

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  • 8 Answers

Not sure what you're referring to as a "main board", but heres the LCD Control Board for the TV

http://cgi.ebay.com/LG-42LC7D-UB-LCD-CONTROL-BOARD-6870C-0119A_W0QQitemZ150277759127QQcmdZViewItem

Posted on Mar 13, 2009

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dsacco86
  • 1077 Answers

SOURCE: replace main board on LG 42LC7D-UB

Try this place, http://www.shopjimmy.com/catalogsearch/result/index/?q=42lc7d-ub&p=2

I the best place I know of to get parts at a good price.
There are a couple of boards that have different part numbers. You'll have to match the part# with yours. It maybe out of stock, but click on it. Then click on "find other products with this part number". Then all the main boards show up with that part number. A couple of them should be should be in stock.

Posted on Apr 17, 2009

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LG 42LC7D-UB after few minutes the sound goes off and channel change by itself


When heats up, the supply voltage from the main power supply board goes less. Check all the soldering to this board for any loose solder terminals. Resolder all the suspected solder terminals by applying a little more solder. If it do not help you, replace the board as card basis.

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Replace main board on LG 42LC7D-UB


Try this place, http://www.shopjimmy.com/catalogsearch/result/index/?q=42lc7d-ub&p=2

I the best place I know of to get parts at a good price.
There are a couple of boards that have different part numbers. You'll have to match the part# with yours. It maybe out of stock, but click on it. Then click on "find other products with this part number". Then all the main boards show up with that part number. A couple of them should be should be in stock.

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Cuts off


Most likely the power supply board.

Lie the tv down on a bed and unscrew the back. Its only about 9 screws around the edge and look at the power board, on the left, see if theres any burn marks.

I have a brand new board I bought the other day for the same issue but before I replaced it, stupidly, I checked with LG and turns out mine is still under warranty so I'm stuck with a new board.

Let me know if you want it. I'll match any price you can find online.

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1 Answer

LG 42LC7D TV does not want to chg channels after 5 min of use


There are some inductors that are out of spec. LG's original SB said to replace some of these with a jumper, but it only lasted a couple months.

You need to have the Total Main Assy replaced.

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