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The screen of my Sony Trinitron CRT Colour TV,has become dark with very low light, brightness and contrast.

The screen of my Sony Trinitron CRT Colour TV, model no. :KV-L34MF1, has become dark with very low light, brightness and contrast. Rest of the functions of the TV are ok. Please kindly advise me where to look for trouble, thanks.

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  • 24 Answers

Slightly adjust the LOT........

Posted on Nov 27, 2014

Testimonial: "Do you mean Line Output Transformer? If yes, do you mean screen or focus adjustment? I am afraid fiddling with these controls might increase the EHT and thereby X-rays."

  • michaelmural Dec 09, 2014

    switch off TV ..........sligtly turn the LOT CONTROL clockwise... then switch on again.....if there is any change in brightness.... repeat the process....

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SOURCE: Sony Trinitron Picture Tube replacement

I think that you will find the picture tube to be more expensive than a replacement TV, if it is still available (unlikely). That being said, it is also unlikely that the tube itself is the problem, The more common problem is the horizontal output transistor or the flyback transformer. Either part should still be available for a reasonable cost. Check with a local servicer for the part numbers and costs. These are common parts.

Dan

Posted on May 19, 2009

  • 1348 Answers

SOURCE: Sony Trinitron kv-27HFR blurry

the picture tube is gone.
i repaired 150 sony xbr and kv series with that problem.sony has a single gun not three and has a great pix,but burn out faster.
there is a main screen control that you can adjust ,but the tube is gone.
on the back of the crt there is 3 gun drives r g b .
turn the color all the way down so it is black and white.
if there is a green ore purple tint,one gun is out of balance.
ajdusting the r g b controls so that black and white is normal is what you want to do.
the crt board has the screen bias voltage 800volts on it so be very careful and use an insulated screwdriver to adjust the drive controls.

Posted on May 13, 2009

TVtechmaniac
  • 140 Answers

SOURCE: The picture on my JVC TV is too dark

On the inside of the TV, on the flyback transformer there should be two controls. Turn the one that says "screen" very slowly clockwise while looking at the pix. The pix should get brighter as you turn it up- if you go to far you will see lines in the pix or the TV may shutdown.

Posted on Aug 30, 2007

palaboy
  • 5807 Answers

SOURCE: no. of part EHT of sony t.v. model no.KV-L34MF1

here:

SONY FLYBACK 8-598-916-10, Electronix

Posted on Aug 28, 2012

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