I have an LG42LD790 TV which has all been working with no problems. Earlier this evening the screen went black and came up with "no input". The inputs being used come up on the screen but when any are selected it comes up with "no signal" message. Not had this ever before. Have switched off and removed all connections and left for 15 minutes and reconnected everything but still same problem. Please help as have two sons who are most annoyed

Question 1

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Samsung tv picture goes black to blue and red power button light goes on and off

The device sources and the inputs have not been set to the correct mod.There could be a problem with the TV it's self for it to be turning off like a problem with the power supply for the TV.

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Main systme control PCB. its the board where all of your inputs are in.

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Try to replace the Main Board one more time.

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Question 2

Al York

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Posted on Oct 29, 2013

Al York

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Did you pull the power plug when you disconnected all the connections?

3 more comments
Steve Jones Oct 30, 2013

Yes I pulled all the connections out as well as the mains lead from the wall. TV recognises the inputs but no signal on any.
Al York Oct 30, 2013

Turn it off and unplug the power from the wall. Wait 10 minutes. Plug it back in. Wait 2 minutes before turning on..
Al York Oct 30, 2013

Turn it off and unplug the power from the wall. Wait 10 minutes. Plug it back in. Wait 2 minutes before turning on..
Al York Oct 30, 2013

That is supposedly the process to reset the main board. Hopefully the main board doesn't need replacing. (Sorry for the separate posts, I can't figure out how to edit the comments.)
Steve Jones Oct 30, 2013

Have tried it and still no luck. TV did make a quiet "swoosh" sound up and down and then showed no signal again. Thanks for the suggestion but will need to call someone out to sort

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