Question about LG 47LG70 42 in. LCD TV

2 Answers

I have an 47LG70. It was working fine until two weeks ago. When I turn it on I can hear my TV through my surround sound stereo but no picture appears the screen, not even any kind of display such as a menu, channel numbers or even static. In an attempt to reset the TV I left it unplugged for a week. Still no luck.

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  • mattblackerb Sep 17, 2010

    The are no outputs from the unit. I have the satilite box connected to the surround sound and the surrond sound connected to the TV with an HDMI cable. I went as far as disconnecting the HDMI cable from the TV and connected it to a second TV I have. It worked fine so I know it isnt the box or the surround sound. Im not tech savvy at the least so I dont really feel comfortable taking the thing apart. The TV is less than two years old so if there is no easier fix I'll try to get a replacement from the store. Please let me know if there is anything else I can do so i dont look like an *** when i try to return it. Thanks

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  • Master
  • 10,515 Answers

Hi,

I am sorry to hear regarding the problem. To begin with, this is an internal failure and unplugging would not resolve the problem. It has to be repaired. As the unit is less than 2 years old, repair makes sense - if the cost of repair is less than half the cost of the TV.It would be really tough to speculate whether this is a problem with the inverter or with any of the electronic circuitry. I agree that these products are not made in the same way as it used to be and i have seen many products being failed within 18 months. This is why i usually prefer extended warranties on these sets.

The ball is in your court.As you cannot open the TV and repair or test the components, it would be hard to determine the exact fault.However, this is an internal failure.

Looking at the cost of the TV and other stuff, i would prefer you to get this unit repaired. However, if you wish you could also go in for a replacement.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Sep 17, 2010

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  • Master
  • 456 Answers

At first the problem sounds like it could be the main printed circuit board, but is odd, because the audio outputs come from the main printed circuit board. Does the TV have the audio output running from the unit? Is the main question.
What I would suggest is, depending on how old the unit is, for instance, if it is only a few months out of warranty, contact LG and they may offer a once off 'Parts Only' or 'Labour Only' warranty for this problem as a gesture of good will.
The unit is getting power, we can tell because the audio still works through the surround sound, so the power supply printed circuit board is ok.
The main printed circuit board, the one with all the outputs and and inputs, seems to be working as it still delivers sound to the surround sound system.
It may be the LCD panel, the logic printed circuit board, a small printed circuit board attatched to the LCD panel or in a less likely case (or not) a component on the main printed circuit board.
I suggest if you are tech savvy and have access to a multimeter or a voltameter, you can remove the back of the unit and test the voltages running from the power supply printed circuit board to the main printed circuit board and from the main printed circuit board to the logic board and also to the voltages leading from and to the LCD panel.
Also keep and eye out for any blown capacitors, the look like a battery with the top bulging out when faulty as they are a common cause of certain issues becoming faulty and other issues still functioning properly.
I hope this helps, good luck.

Posted on Sep 17, 2010

  • Adam Jerome_lagudi
    Adam Jerome_lagudi Sep 17, 2010

    Test the TV using different inputs from the satellite box, AV1, AV2, etc to determine if possibly it may be a set up issue in regards to the HDMI, like the dpi settings.

    A lot of LG units have a habit of becoming temperamental with the HDMI cable, when using my LG unit as a monitor for my laptop I may sometimes need to insert and remove twice before it functions with picture and sound, annoying yet just the way it is as I have pulled it apart several times after frustration getting the better of me.

    Also try using another HDMI cable and also if possible even a games console with using a HDMI cable to determine where the fault may lay, TV settings or otherwise.

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