Question about Standard (CRT) Televisions

2 Answers

TV SCREEN VERY DIM

THE SCREEN IS VERY DIM EVEN AFTER ADJUSTING THE BRIGHTNESS TO MAX.
ALSO AFTER ADJUSTING THE SCREEN VOLTAGE AND FOCUS ON THE FLYBACK TRANSFORMER,STILL NO CHANGES NOTICED TO THE
SCREEN.
WHAT COULD BE THE PROBLEM?

Posted by on

  • arienopapa Apr 17, 2008

    Thanks for your solution ,im now going to check the line voltage and change the capacitor.

×

2 Answers

Good day Sir,

Concerning the problem above i.e dim screen, my tube is ok, i replaced a capacitor of 22mfd 250volts but there was a slight improvement.
Im now planning to replace these capacitors around the power circuit.
I hope there will be improvements,please advice.

Best regards,
Maurice.

Posted on Apr 22, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 149 Answers

Is your picture tube ok ? if is ok check for 200 volts line call boost voltage is comon problem 10 mfd 250 0r 350 volts

Posted on Apr 17, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Picture is dark


There is a high voltage transformer(flyback) inside of this set that has two controls on it. One is for focus and the other is for screen control(brightness). You may want to try adjusting the screen control clockwise to see if that will help. The transformer is large, either black or gray, and has a thick red wire going from the top of the picture tube to it. It should be located close to the back of the set.I would try this first before I took it to the shop. Good luck!

Sep 02, 2010 | Toshiba 32AF44 32" TV

1 Answer

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

Mar 06, 2010 | Standard (CRT) Televisions

2 Answers

Picture out of foucs


HIGH VOLTAGE WARNING - open the tv and on the flyback Xformer, there should be a knob that is labeled FOCUS try adjusting it. the flyback has the red wire on top that goes directly to the the top of the picture tube.

Jan 11, 2010 | Standard (CRT) Televisions

1 Answer

Horizonal lines at top of tv screen. what's up..how to fix


If those lines are slightly tilted (diagonal) you may be seeing the retrace of the horizontal sweep which isn't supposed to be visible.
At the loss of some brightness, adjusting the screen voltage on the flyback transformer (large, black block with a fat lead connecting to the forward side of the picture tube) may help but it is likely that there is a (possibly bipolar) electrolytic capacitor is failing. This would be located near the flyback and is marked in some manner as bipolar and will be in the range of 10 - 30 uFd. If you attempt this yourself, it will require a good deal of caution since there are potentially exposed high voltages in this area. Some kind of insulated tool is recommended and the flyback will have two (rarely three) adjustment located on it; one will adjust focus, the other screen voltage.
If you are reluctant to try this yourself, it's OK, this kind of DIY isn't for everyone.

Oct 17, 2009 | Toshiba 27A43 27" TV

1 Answer

Thin diagonal lines on screen. How to adjust whit balance ,screen end focus?


Is that diagonal thin line about 10 to 20 degree slant? And then you have a very bright raster?

Then you set the flyback(for tube tv), I think its "screen" voltage is set too high adjust it slowly to lessen the brightness. It is commonly a small pot on the side of the flyback together with the focus pot.

If you have raster turn the tv on, use insulated screw diver, then slowly turn the knob to the direction(CC or CCW) where your raster go dim.

Be careful your dealing with live and high voltage. If your not inclined on electronics better not to.

Oh BTW, set your settings to normal.

Sep 30, 2009 | Standard (CRT) Televisions

2 Answers

Focus


its the convergence problem in your power supply board

please check out this links

for convergence board ics reparing it your self

http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm

and for convergence settings

http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html


also check out for the convergence bulb if that goes dim the screen becomes out of focus

thanks.



Oct 13, 2008 | Zenith SY2728RK TV

1 Answer

Picture is very dim


there is a problem in the flyback section of the tv set. the fly back has two knobs, one for screen and the other for focus. use the screen knob to adjust the brighness. if it did not help, either check the capacitors around the flyback or change the fly back with a new one. good luck

Jun 01, 2008 | Standard (CRT) Televisions

2 Answers

Screen too dark even with all brightness settings set to max


The picture is very dark it is mostly due to 1 power supply output is low. 2 voltage on crt g2 pin is low. 3 video output supply is low. 4 some components in luminance section might be defective or loose. 5 finally crt getting weak is set is old. good luck

Sep 21, 2007 | JVC AV-27430 27" TV

1 Answer

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.

Aug 21, 2007 | JVC AV-27D104 27" TV

1 Answer

RCA D32F750T TV


Did you adjust the two controls on the new flyback? The top one is almost always the focus control and the bottom is the G2/screen control (brightness) If you adjust the G2 do it until the picture looks normal, too high and you will get retrace lines through the picture.

Jan 25, 2007 | RCA D32F750T TV

Not finding what you are looking for?
Standard (CRT) Televisions Logo

Related Topics:

205 people viewed this question

Ask a Question

Usually answered in minutes!

Top Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

68368 Answers

matt martin
matt martin

Level 3 Expert

1191 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Standard (CRT) Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...