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Display Problems In CRT TV/Monitor

By on May 9, 2010

monitor problem

I suggest that you print out this images of CRT TV/Monitor display problems for reference. To some beginners, they do not know how a pincushion or a keystone distortion problem look like. It is important to know these images so that you will know which section to check when you test the CRT TV/Monitor with a test colour pattern program or generator. Please click on the ebook cover below if you want to be good in CRT TV Repair:

crt -tv



  1. francis Chip

    October 4, 2017 at 2:13 pm

    my philips Tv screen 23 inches is turning on from the center going side ways which can be the problem

    • Jestine Yong

      October 6, 2017 at 3:12 pm

      Hi Francis,

      Without hands on assessment to perform the voltage/signal test, I would not really know what would be the actual cause.


      • Praveen Joseph

        January 27, 2019 at 9:29 pm

        Hello sir,
        My CRT TV is not working.. anode high voltage is coming,crt base r,g, b voltage also ok. But tv screen is in off position. When i adjusted flyback transformer knobs then white colour came on the screen. But no grains.. Please help me sir..

    • Bilawal

      August 3, 2019 at 11:13 pm

      My crt moniter not power on what's the problem?

  2. MD Nazmul huda

    October 5, 2017 at 2:18 pm

    Hi sir, my LG 15 inch crt monitor screen size horizontally has shrinken.
    From the both side almost 1.5 inch. From setting I put it 100. Virtual size is ok, no problem. A local mechanic said it might be flyback transformer, but original one is not available. Could it be other problem? Thanks

    • Jestine Yong

      October 6, 2017 at 3:16 pm

      Hi Md Nazmul,

      If you get a non original flyback it can cause such problem. If the B+ voltage is good, safety capacitor value is within range and modulation diode/pincushion transistor is good then it can be the flyback.


      • MD Nazmul huda

        October 7, 2017 at 1:13 pm

        My flyback is original. Crt never repaired since 2005. How much should be the B+ voltage?

        • Jestine Yong

          October 9, 2017 at 9:36 am

          Hi MD Nazmul,

          Normal B+ voltage should be 110 vdc. Some designs may be higher.


  3. praveen

    October 11, 2017 at 8:04 pm

    got an old crt pc monitor.when switched on there is no display(brightness) nor any osd message.after some 5 mins brightness shows up gradually after heating up.any idea what may be the cause?

    • Jestine Yong

      October 12, 2017 at 9:52 am

      Hi Praveen,

      It could be due to weak pc tube or the heater voltage is low due to bad e-cap.


  4. Arul

    October 13, 2017 at 2:23 pm

    My Crt monitor displaying only one harzontal line how to solve that pbm

    • Jestine Yong

      October 14, 2017 at 10:21 am

      Hi Arul,

      Please visit this link:


  5. david

    October 15, 2017 at 10:17 pm

    my crt LG TV after switch on it when display come to appear gose on stb what's might be the plobrem

    • Jestine Yong

      October 16, 2017 at 10:41 am

      HI David,

      Many factors such as bad power supply, bad flyback, bad Microprocessor or eeprom IC data, and etc.


  6. d s

    November 1, 2017 at 2:26 pm

    Hy sir,
    My ultraslim sansui tv dims britness after 1 minute.please tell me the exact problem.

    • Jestine Yong

      November 2, 2017 at 10:03 am

      Hi Ds,

      What have you checked?


  7. Bhushan

    November 17, 2017 at 9:36 pm

    my AOC -e936SWA led monitor display comes on rain drops type rainbow colour shades and led mdisplay down side black spot wares how its gone please guide us

    with regards

  8. Brighton Thomas

    December 11, 2017 at 7:35 pm

    My 21 inch TV screen is showing black top and bottom suddenly

  9. Subhash

    December 13, 2017 at 3:50 pm

    Hi Jestineyong
    Samsung tv power supply ok no osd and retrace line all voltage regulator ok. On neck ic for rgb replased vertical ic and related capacitors replaced what could problem? Pl guide me
    With regards

  10. mudasir

    December 28, 2017 at 10:43 pm

    hello sir
    front panel of my intex CRT monitor freezes after some seconds and does not respond

  11. Dariel

    January 13, 2018 at 7:05 pm

    Hi sir i have a problem to my crt sharp tv 21 inch no display and no sound if i turn on the tv the red light is on then i turn on the remote the sounds like ok then after a second theres no happen then the filament has no light...the horizontal transistor is ok...plz help me sir

    • Rewel

      December 11, 2018 at 2:24 pm

      Wt could b the problem

  12. Stanford Ledwaba

    January 27, 2018 at 4:39 am

    My neibour sent Hisense TV for repair. Model number TC2100SA. TV not coming on after lightning struck. I first cleaned board with brush. I started looking bulge cps, burned resistors, and other power supply.lfound the following parts burn=IC wc8705,cap 150uf 450v,cap220uf 160v,cap47uf 250v,cap1uf 50v,cap333 and R569,R718 and five diodes (RI57 MCI). I replace all parts TV still not making on. I trust and hope your guide can help me Taking you Stanford Ledwaba

  13. Godfrey

    March 3, 2018 at 3:58 am

    Whenever I turn my CRT TV 21", all the lights gets off in the house and DVD plus others
    What can be the problem?

  14. Michael Mesmer

    March 11, 2018 at 11:49 am

    Weird one, here... 1992 Sony Trinitron KV27EXR 20. On TV mode, static fills the screen... Hook a console up to it (via RF, S-Video or Composit RCA) there's slight keystoning. I cleaned about 26 years of dust out of it, but if course that didn't help. Any ideas? Thanks in advance!

  15. Fred

    April 20, 2018 at 11:06 pm

    My Hitachi TS-6442 26" CRT TV has a picture which is dark on the left and bright on the right. Any suggestions?

  16. Njuguna

    May 15, 2018 at 10:48 pm

    how do i check whether the signal from the driver transistor is reaching the H.O.T using a multimeter?.

  17. Subair

    July 3, 2018 at 12:34 am

    Sir my crt tv picture is ok but after few seconds series bulb going
    to bright and going to off. After restart automatically and continous this process. How to repair this problem

  18. vlad

    July 14, 2018 at 7:38 am

    hello i have a 1995 samsung tv works great perfect colors good tube but no osd it doesnt show channel number,volume,menu. i need osd to search new channels do you know a fix for it thank you!

  19. nkokana

    May 2, 2019 at 2:46 pm

    i have a sumsung crrt tv that had a horrizontal line and i changed a vertical ic.after that a tv developed an on an off problem.if i place a series globe it lihgts and dims simulteniousely.what can be the problem

  20. Bind

    May 18, 2019 at 9:23 pm

    Hi sir, my crt tv has no display, no sounds, I already replaced the transistor of powersupply section, but still nothing happen, what should I do, thanks

  21. rom

    May 25, 2019 at 6:49 pm

    good day sir any advise on crt tv with no video or menu display but sound ok.the screen is all white all voltages from G2,RGB,H are all good

  22. sajjad shah

    July 14, 2019 at 1:01 am

    My sony tv turning on and displays volume line and channel number .but not picture is shown and audio is also on.what can be the problem please???

    • Jestine Yong

      July 16, 2019 at 7:59 am

      Hi Sajjad,

      It could be missing heater voltage, too low the G2 voltage, G1 voltage could be improper, no high voltage, bad Video pre-amp IC and etc.


  23. Teddy Ayto

    July 30, 2019 at 4:35 pm

    Hi sir!
    I have 21" crt tv. Half of the screen left side is black and the right side is works fine. There is "tik tik" sound. What will be the problem?

    • Jestine Yong

      August 2, 2019 at 7:23 am

      Hi Teddy,

      The screen problem might be due to lack of B+ voltage, dry joint or bad components in the horizontal linearity circuit. The sound could mean the flyback have problem.


  24. skip rick

    September 9, 2019 at 8:48 am

    i have a an old crt computer monitor that switches on shows a "no signal video cable connected" message then it goes back to sleep /idle as if its vga cable is not connected to anything even though it is ,its OSD don't show up when i click the menu button during that brief message,the monitor was fried trough its vga cable by a faulty computer psu that also fried another LCD that someone fixed for me

  25. Italo oliveira

    September 11, 2019 at 6:22 pm

    Hi, my crt tv samsung is a litle stretched on the sides, when im playng retrogames, as the object goes moves from the center to the left or right it stretchs, it can be solved on sercice menu? How can i fid this? Thank.

  26. abdu

    March 29, 2020 at 5:41 am

    Sir Jestine
    how R U? am from Ethiopia my question is I have Samsung 21 Crt tv unfortunately after the drops down of the tv is not able to deliver sound and picture except blinking of starting power but the screen is still black. I open the cover but nothing is broken. so what i shall do to fix this problem and what you advice me as a technician?

    • Jestine Yong

      April 1, 2020 at 2:17 pm

      Hi Abdu,

      I'm fine thanks. In your case you need to check if there is any hairline cracks. Power blinking can be due to many reasons. I suggest thhat you make sure the power supply produce good and stable output first before check on other parts. No picture can be due to the flyback not energized or even broken picture tube.


  27. Joseph

    May 20, 2022 at 3:07 am

    Good day engr jestinyong, I'm Joseph from Lagos Nigeria. I have 29" crt tv. The picture is not full by the left and right side top.i have changed the complete tv panel board but still same problem, please guard me.


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