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Dark picture on quasar sp5133b

Tried ajusting brightness picture color and sharpness

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  • 26 Answers

There are two possibilities the first is A bad picture tube which would be too expensive to repair or it could be the capacitor in the 220 volt source which is derived from the flyback transformer most likely it is 10MFD @ 350 WV or close to that

Posted on Nov 27, 2012

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Posted on Jan 02, 2017

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techman
  • 3130 Answers

SOURCE: dark picture (HELP)

Open up the back of the set but be very carefull. Notice a large black block with a large red wire that runs up to the picture tube. on one side of that large block where the thick red wire is comming out of are two controls, one should be marked focus or F and one should be marked screen or S. With the set operating normally and not touching anything else, slowly turn the control marked screen or S clockwish till the picture gets bright enough. If you go too bright the set will shut down or you see small thin white lines so back down on the control. then touch up the focus and your good to go. good Luck.

Posted on Mar 20, 2007

techman
  • 3130 Answers

SOURCE: Dark screen/picture.

This 30" flat screen TV set may have a problem in the high voltage circuit of the TV set. You may be able to adjust this by taking off the back of the TV set. Look for the block where the large red wire runs up to the top of the picture tube. On this block will be two controls. one will say screen and one will say focus. Try and slowly turn the control that says screen or S on it clockwise and see if you can make the picture brighter. Turn up the control till you just start to see faint lines in the picture, then back the control down till the lines go away. If the picture does not come up when you turn this up, and all you get is a blank screen, you will need to have this set repaired by a qualified repair person. Good Luck

Posted on Jul 15, 2007

MikeNJ1964
  • 398 Answers

SOURCE: brightness of picture

If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.

Posted on Aug 21, 2007

  • 74 Answers

SOURCE: tv picture is too dark- worked with contrast and

This sounds like low screen voltage(A1)try adjusting the a1 voltage bottom control on flyback transformer if you have a voltmeter, voltage on crt base possible market screen or A1 shoud be beteen 350/500 volts when making adjustment remember to take into account current taken by meter If voaltage will not adjust flyback transformer will have to replaced

Posted on Mar 06, 2010

Raditronic
  • 196 Answers

SOURCE: Quasar 20yr old color tv sound but no picture, is it repairable

try adjust screen up, in you see horizontal line in bottom, the tv have the vertical ic with cold solder or bad.

Posted on Apr 21, 2010

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