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I have a Magnavox 15MF400T/37 LCD TV operating with a cabel connection. As of yesterday it has no functions but when I turn it on I get a message that says Attention No Signal. I have checked the cable connection and it is good. I can't get the TV to give me a menu and none of the troubleshooting hints cover this message. I can change channels but after a few seconds, the TV automatically goes to standby mode. when I turn it on again I get the same No Signal message and the screen is black.

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  • je25williams Jul 21, 2008

    I have tried turning the TV on through a DVD player. That does not work either. It is not the cable connection. I have checked that with another TV.

  • je25williams Jul 21, 2008

    So if the tuner has failed, what does that mean? Does the TV require repair or is it gone?

  • je25williams Jul 21, 2008

    I have done all that you suggest with the disconnect, cable checks, etc. Still No Signal.

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  • Master
  • 19,396 Answers

Do the following to test your tv:

Disconnect all devices, including cable, DVD , tuner etc.
Unplug (turning off is not enough ) poer cable from tv for 20 or 30 minutes.
Get a portable aerial, old coaxial cable.
Start tv with only portable aerial and power cable plugged.
If it stays on connect back cable and dvd.
Cable cable carries power along with the signal, cable and sctellite devices sometimes cause similar problems.

Posted on Jul 21, 2008

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  • Master
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In the event that you have a defective tuner, the part itself might not be available but the whole assembly where the tuner is mounted could be available from philips.
If your TV is less then a year old, still under warranty by the manufacturers.

Posted on Jul 21, 2008

  • Jaime Hernandez Jul 21, 2008

    The cost for the repair might not be economical if the entire assembly needs to be replace.

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  • Master
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If you have verified that there is a good signal on the cable (try the cable on another TV) then it looks like there is a problem with the tuner. Something in the tuner has failed and the set is detecting a loss of signal.

- Jim

Posted on Jul 21, 2008

  • SHARCNET-USA
    SHARCNET-USA Jul 21, 2008

    A defective tuner can be repaired/replaced but it will require a qualified technician to do it. The technician will also have to have access to the replacement parts and a schematic/Interconnect. You will need to take it to a service center and obtain an estimate. You will then be able to determine whether or not it is worth fixing or buying a new unit. If it is under warranrty, your repair will be covered.



    - Jim

  • SHARCNET-USA
    SHARCNET-USA Jul 21, 2008

    Also, if this is a problem that just happened out of the blue, without the user moving the set or bumping the RF input connector, I would still say you have a tuner issue.



    A bad RF input connector would be loose. This is more critical if the jack is soldered directly to the main PCB rather than using a cable from the jack to the main PCB.



    The user didn't mention if the set had been moved or jarred, so I am assuming the problem just happened without any external influence. If that's the case, then I would try doing a power reset. If that doesn't work, then have the tuner looked it.



    - Jim

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  • Master
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Some of the newer TV's dont turn on if there is no input signal. Try a DVD player and see if that works. If it does, then the issue is most likely with the cable jack on the TV, which may need to be replaced..

Posted on Jul 21, 2008

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