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Jvc tv I replaced the projection lamp and my picture is dark and takes 2 or 3 hrs. to warm up.It won't get bright like it use too.??

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  • Master
  • 12,223 Answers

FOLLOW this steps and fix it. God bless you

  • 1
    Power down the TV. Let it cool down for several minutes to avoid touching anything hot. There are many parts inside the TV that could be hot.

  • 2
    Unplug the TV and all media devices attached to it. Let the TV sit again for several more minutes just to be safe. The lamp receptacle and other components could still be hot.




  • 3
    Unscrew the back cover of your TV with a screwdriver. Have someone help if the cover is big. The lamp's housing unit on most TVs is located towards the bottom. Refer to your TV Owner's Manual for specific instructions.

  • 4
    Unscrew the lamp's housing unit with your screwdriver. Take your time to avoid damaging the housing unit. You'll see the lamp once you open the housing unit.

  • 5
    Use a soft cloth to unscrew the lamp out of the housing unit. There's a possibility the lamps- could still be hot. The cloth will help protect your hand.

  • 6
    Screw the replacement lamp into the housing unit with the same soft cloth. The oils from your fingers could ruin a rear projection TV bulb.

  • 7
    Reattach the lamp's housing unit and TV back cover. Make sure no wires are loose or get caught when screwing the back cover on.

  • 8
    Attach all media devices like cable or satellite boxes. You should now be able to watch your TV with a brand new picture.


Posted on Jul 25, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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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

  • 1694 Answers

SOURCE: screen too dark even with all brightness settings set to max

Try turning up screen voltage with control on transformer....
one is for more brightness and one is for focus.......T.

Posted on Dec 11, 2007

  • 149 Answers

SOURCE: dark picture on toshiba tv 32af44

Sound like the back light has gone, its what gives the picture brightness. Sounds like a technician job. Sorry........

Posted on Apr 10, 2008

JollyRoger00
  • 59 Answers

SOURCE: Hi. I have a JVC tv model AV27430, and the picture

What he was refering to is called the "FLYBACK"

It is a voltage regulation circuit that has 2 controls, 1 for brightness or "GAMMA" and one for focus.

WARNING:: TV'S HAVE HIGH VOLTAGE THAT CAN KILL YOU

To locate your flyback simply remove the back from your tv and look at the main tube, off the main tube will be a cord that looks like it comes from the top inside of the tube and goes down to a circuit board, that is the flyback, and if you look on it it should have 2 turn knobs or potentiometers , some manufactures glue these in place but the glue is easily removed. 1 of the 2 is the brightness, it's eisier to put a mirror up so you can see what your doing other than ask someone to tell you.

This is a picture of a flyback outside of the TV
http://www.fixya.com/uploads/images/767D93D.jpg

Posted on Sep 23, 2009

SD Tech
  • 14553 Answers

SOURCE: jvc av-27432, the picture on this tv is very dark.

There is a way to adjust this but it requires removal of the entire back cover-----YOU HAVE TO BE VERY CAREFUL WHEN YOU DO THIS AS THE SET HAS TO BE HOOKED UP AND TURNED ON!

IF the problem occurred over a period of time you have a good chance-----if it happened suddenly--you have a problem in the set.

With the back removed locate the HIGH VOLTAGE TRANSFORMER- it will have a large red wire coming out of the top of it that snaps into the top center of the picture tube (this is the anode lead) DO NOT GET ANYWHERE NEAR THAT LEAD WITH THE SET TURNED ON---ABOUT 25 THOUSAND VOLTS IS THERE

IF YOU LOCATE THE TRANSFORMER(ABOUT THE SIZE OF YOUR FIST) IT WILL HAVE TWO CONTROLS ON THE BACK---the upper one is Focus and the lower is SCREEN

With the set on turn the lower control (Screen) slowly to the right until the brightness comes UP---DO NOT TURN TOO FAR OR YOU WILL GET TRACE LINES AND THEN THE SET WILL SHUT OFF!

If adjusting the master screen does not solve the problem---you have a circuit problem and the set may or may not be worth fixing. Usually if the picture got darker over a long period of time--just adjusting the screen control up A LITTLE will restore things to normal.

I cannot tell you how important it is not to touch anything in the set---keep one hand in your pocket and use the master screen slowly.

Let me know what happens and if you have any questions ask before you attempt this.

Regards, SD TECH

Posted on Oct 10, 2009

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