Question about Standard (CRT) Televisions

1 Answer


Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 1,139 Answers


The answer is yes, if all you have to do is to adjust the horizontal hold control (usually located on the back of the TV)

The answer is no (with caveat) if you have to open up the set. This problem occurs when the horizontal oscillator is drifting off its set frequency of 15,750 Hz This can be caused by a component or components changing in value, or the problem could be caused by the loss of or decrease in the amplitude of the horizontal sync pluses within the video signal. Such a loss of amplitude can take place from the output of the Video detector to the Horizontal mixer stage (uses the Video pluses and the Horizontal oscillator to sync the picture). This means that you will be working around a hazardous section of your TV.

The caveat is if you have a background in electronics and you have the proper equipment.
1) schematic diagram of the TV to see where TV test-points are
2) multimeter to measure DC voltages at test points
3) oscilloscope to view waveform patterns in the horzontal section of the TV
4) Signal generator to produce a know good signal into the TV set.
5) Isolation Transformer to connect the TV power plug to to isolate the Tv ground from earth ground and allow proper connectivity for test equipment (plug the unit under test into the isolation transformer and the test equipment into the wall outlet.)

I hope this answers your question,
Thank you,

Posted on Nov 26, 2007

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

1 Answer

The horizonal hold is not working it rolls up and down

I understoof about your problem of Mitsubishi CS-35503* TV , I think you should change your interlace scanning frequancy by remote control t0 50Hz

if there will not effect then change your horizontal hold IC

Thank you!!

give your rate!!!

Feb 20, 2011 | Mitsubishi CS-35503 TV

1 Answer

Continuous vertical roll on tv

Wow 5 months without a solution. NOT GOOD.. Well I hope I can help...
This sounds like a vertical hold problem, and is normally easy to fix.... There should be a couple of nob's on the lower back of the TV. One for vertical and one for Horizontal hold. You need to find the vertical hold nob and adjust it, until the rolling stops and stabilizes. If however these nob's are not visible you will have to take TV to an engineer to fix it.
Hope this helps..

Nov 11, 2010 | Zenith B27A11Z 27" TV

1 Answer

Horizontal hold needs an ajustment

Horizontal rolling is your problem I thinks. In modern TVs there is no horizontal hold control like they wer in old one. All the adjustments are digital, that is related to a very accurate crystal oscillator frequency, and its cound downs. Therefore if your TV is not so old, its main Ic may be faulty, or horizontal synchronisation pulse does not reach the appropriate pin of that Ic. First check it, and if it is ok, replace the Ic.

Oct 18, 2010 | Durabrand DU1301 TV

1 Answer

Picture displays horizontal roll

It's the Satellite Disk that is the problem. Just call the guy..

you can also try to unplug and plug it back in.

Oct 23, 2009 | Philips Magnavox 20MS3442 20" TV

1 Answer

Picture keeps rolling

do you have cable to the set or are you on rabbit ears if on ears adjust antenna for the strongest signal.

Mar 27, 2008 | Sony KV-32S16 32" TV

2 Answers

Tv roll

Are you sure the roll isnt Vertical? as if it is then all you need to do is adjust the VERTICAL HOLD PRESET POT which should be located on the PCB somewhere, its very unusual for TV.S to roll horizontally as then the picture just goes out of sync. and you would not see a picture at all. When you find the pot turn it ( with a small screw driver) slowly until the rolling stops, if it does not stop then you have a faulty component in the vert. sync. circuitry.

Feb 04, 2008 | Standard (CRT) Televisions

1 Answer

Continuous rolling screen.

check out and find the error code

Dec 24, 2007 | Mitsubishi VS-60607 TV

1 Answer

Horizontal lines across the top 2 - 3" of the screen

Sounds like you have some capacitors that are needing to be changed in the vertical circuit. The cost I cannot quote but, it probably won;t be worth the cost as replacement TV's are much cheaper now. Zeniths and other brands for the longest time have used not controls inside the TV, they are technician adjustments through a service menu only.

Apr 19, 2007 | Zenith C27A24T 27" TV

2 Answers

Horizontal roll on mitusbishi 35" tv

is this a horizontal black line going up or down? if yes, this sympton is caused by a trouble in the integrated circuit or in the vertical oscillator circuit. this symptons has 2 variations. one is the intermittent rolling of the picture. this referred to as the "loose vertical hold" the other variations is the continuous upward or downward rolling of the picture

Jan 15, 2007 | Mitsubishi CS-36509 TV

1 Answer

Picture has a horizontal row

this symptom is caused by a trouble in the integrated circuit of in the vertical oscillator circuit. try to look if your tv has a vertical hold control at the back or inside, if it does not have, u have a problem in the vertical oscillator circuit. by the way, its not the horizontal that u should concentrate into, its the vertical. coz this is a vertical sync problem.

Jan 12, 2007 | Konka K2001UM TV

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

Related Topics:

482 people viewed this question

Ask a Question

Usually answered in minutes!

Top Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

66352 Answers

matt martin
matt martin

Level 3 Expert

1187 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