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Symptoms of Some Most Common Display Problems of CRT TV and CRT Monitors


common deflection problems


These are the common display or deflection problem that you can encounter when troubleshooting a CRT TV and Monitors. You can print this image to serves as your reference when you are repairing a deflection or display problems of a CRT TV and Monitors. For beginners who are new in this field, they don’t know how it looks like a Pincushion or Keystone Distortion problem, that is the reason why they have difficulty in looking the fix on this kind of problem.

Single Horizontal Line

When you encountering a problem like this, all you have to do is to check the Vertical Section. This is usually caused by a loose or cold solder of the vertical IC or any components in the vertical section, a leaky capacitor, open resistor or no power.

Single Vertical Line

When you encountering a problem like this, you have to check the horizontal section. On my experience with this kind of problem, I got problem like this on a TV unit having a loose or cold solder on the pin going to the horizontal deflection yoke. This problem is rare to see because when there is no horizontal deflection activity, it won’t make a display.

Pincushion Distortion

We can find this problem usually to the old model of Sony TV and other TV and monitors having a problem on the pincushion circuits. This is usually a problematic capacitor causing this type of problem. On Sony TV, you can easily find their pincushion circuit, you have find first the JRC4558 which serves as its Pin Amp and the components around it are part of the pincushion circuit.

Keystone Distortion

The cause of this kind of problem is usually a corroded deflection yoke. I have experience this kind of problem on a Samsung TV that I am repairing. I’m glad that it don’t destroy the H-output.

Posted by Ronelex 17 Responses

17 Responses to “Symptoms of Some Most Common Display Problems of CRT TV and CRT Monitors”

  1. SAM says:

    what about power option light blinking in a crt monitor? it way too common too

  2. natharsha says:

    my tv yoke line 25 volt capacitor its blow please give me a solution


    My CRT LG TV sound is good but the picture is dancing and many small waves horizontally… Is there any idea regarding this problem?

  4. joel figuracion says:

    Hi good morning, my samsung tv have this problem, the pinchusion distortion do you have any idea what is the primarily defective or suspected parts do i realy need to replace it? and in what section? tnx

    • ronelex says:

      I suspect the yoke, check if there is some corroded wires inside those wires that attached to the neck of the TV, kayo na po ang umitindi :D

  5. In fact when someone doesn’t understand afterward its up to other people that they will help, so here it occurs.

  6. Vlad says:

    I have a TV Philips CRT with a different problem. Black screen. When i open it, sound is good, but i have no picture, image. Could you help me to figure it out ?
    thanks !

    • ronelex says:

      looks like the problem is the ABL resistor maybe open but I don’t think it is really the problem. I have a problem with that model because it has a lot of protect circuit :)

  7. balamurali says:

    veryg good details

  8. saqib says:

    my monitor dell e771p has a pincushion problem, please advise

  9. Lalisa saron says:

    Hi i have a problem regarding my JVC AV-14UMG9B model tv sound is good but no picture & smoll vertical colored wave at the top of the scrine to the bottom.pleace help me do you have any idea regarding this problem?

  10. zwei says:

    sir i have an old crt tv that when turned on the sound is there but the display takes around 3 to 5 mins before you can see the picture…

  11. Ramesh says:

    I have Videocon 29 ” flat tube CRT TV inwhich every thing allright except picture gets 2″ upward from bottom. Once it had been repaired but fault repeated after one month.
    Whats soln now ?

  12. geoff kachala says:

    hi i have a problem with my screen when testing without connecting to tube its shooting but when connected to tube its not shooting is just standing in standby mode. thanks in advance

  13. Amir says:

    Hi sir ronelex pwede patulong or pwede mka hingi ng diagram ng samsung ct-2013 surplus tv.

    Parang ganito lang po siya sir:


    1. After minutes of veiwing blue screen na.
    2. If pindotin mo any channel button lalabas na naman iyong raster[lamok lamok kung tawagin nila] at video na naman ulit.

    Pasenya na po nagloloko kasi smart net namin dito kaya di ako maka log in sa mga lumipas na mga araw.


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I am a graduate of Bachelor of Science major in Electronics. I work as a computer technician and I am also a blogger.

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