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I have 20 inches tv there is a sound but no picture,it so dark picture

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  • Noel Jucutan
    Noel Jucutan Oct 15, 2010

    your cathode or led is getting weaker try to replace it.

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  • Master
  • 901 Answers

Since you say dark picture visible, then : Brightness control setting!

Check the resistors on the neck PCB. If you find the resistance value of these resistors high, replace them.

If No EHT is found then also there won't be a picture visibility.

1. Open the back cover and see whether you can observe a faint filament glow in the picture tube neck, close to the picture tube socket.
If there is no glow E H T circuit failure.

2. If the glow is observed check picture tube grid voltages grid no. 2. as said above.

( the points referred above are all for technical people)

Posted on Oct 15, 2010

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