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.


  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


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