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CRT Television Troubleshooting Guide

By on November 7, 2014










crt tv repair ebook

My good repair friend from Kenya Mr Humphrey Kimathi has just launched his new ebook in CRT Television repair. Below is the list of the content:

List of Content

Chapter 1: Main fuse keep on blowing.

Chapter 2: Power supply is dead, voltage at the main capacitor but nothing at the secondary side.

Chapter 3: Screen takes long for the picture to appear.

Chapter 4: Colored spots on the screen

Chapter 5: Only horizontal line appear on the middle of the TV screen

Chapter 6: Screen partially closed with black stripe at the bottom or top of the screen

Chapter 7: intermittent single horizontal line



Chapter 8: Screen with some white lines across the top part of the screen

Chapter 9: Vertical line appears on the screen.

Chapter 10: Power supply is okay, but HV is missing

Chapter 11: HV is present but the screen is dark.

Chapter 12: Screen is blue but audio is okay.

Chapter 13: Simple test for Cathode ray tube (CRT) bad or not.

Chapter 14: Picture is purple, Yellow, light blue.

Chapter 15: Horizontal output transistor (H.O.T) shorts immediately after replacement:

Chapter 16: Horizontal output transistor (H.O.T) get too hot, then short after hours/days/ or weeks after replacements.

Chapter 17: Picture is okay but no audio.

Chapter 18: No Picture and No audio but on screen display (OSD) present

Chapter 19: Retrace lines on the screen.

Chapter 20: Picture is black and whites (no colour)

Chapter 21: Understanding CRT Television Critical voltage test points

Chapter 22: Installing universal TV board (TV kit)

Chapter 23: Conclusion

Please click HERE or the above ebook cover for more information.




You may check out his first ebook in CRT TV repair in the below link:






  1. Robert

    November 7, 2014 at 11:44 pm

    Congratulations Humphrey.

    • Humphrey Kimathi

      November 8, 2014 at 1:13 pm

      Thank you Robert.
      Regards Humphrey

    • Humphrey Kimathi

      November 8, 2014 at 1:30 pm

      Robert, Kindly ignore the dislike above,i clicked it by mistake and i am not able to undo..may be Jestine will check out on that so that one can be able to undo such an error in future.
      Regards Humphrey

      • Jestine Yong

        November 8, 2014 at 1:56 pm

        HI Humphrey,

        It can't be "Undo" it. No worries Robert will surely accept your accidentally click.


        • mbulambago george

          October 10, 2016 at 3:58 am

          l have a CRT TV which is having a single horizontal line please guide me on how to solve it. thank u sr

          • Jestine Yong

            October 10, 2016 at 3:11 pm

            Hi Mbulambago,

            Please refer to this link:



      • Robert

        November 8, 2014 at 8:03 pm

        No problem my friend.

        • Robert

          November 15, 2014 at 10:08 am

          Also Humphrey, I will be purchasing your e-book soon. Although CRT's are hardly used here now in the USA, I still love learning about the circuits and how to fix them. Plus I want to help support your efforts to bring us good books and add it to my book collection.

          • Humphrey Kimathi

            December 8, 2014 at 9:33 pm

            Thanks and Welcome Robert, Be blessed.
            Regards Humphrey

          • Fred Jacob mmary

            September 25, 2017 at 11:22 pm

            That is so great to continuously increasing the knowledge daily

    • Uttam Sarkar

      June 21, 2018 at 11:55 pm

      Lcd tv book

  2. Luciano

    November 8, 2014 at 2:11 am

    Dear Mr Humphrey,
    You always inspire me when it comes to issues concerning Electronics! I am interested in purchasing and reading this newly launched E book .

    • Humphrey Kimathi

      November 8, 2014 at 1:21 pm

      Hi Luciano,
      Thanks for your compliment Luciano, For your copy i will actually do it by hand delivery to your place here in Nairobi...hahahee

      Regards Humphrey

      • thabu jacob

        April 26, 2018 at 3:42 am

        Can I also get one

      • Jamka

        February 8, 2020 at 2:25 am

        How much is that book

    • Vincent

      September 27, 2021 at 11:35 pm

      Hi Humphrey how can I get hold of the book?

  3. biruk aweke

    November 8, 2014 at 12:46 pm


    • Humphrey Kimathi

      November 8, 2014 at 1:28 pm

      Mr Aweke,
      THANK YOU!

      Regards Humphrey

  4. Austin

    November 9, 2014 at 4:32 am

    congratulation humphrey,can that ebook be download through computer?

    • Humphrey Kimathi

      November 10, 2014 at 1:56 pm

      Austin, the book is downloadable instantly to your computer, tablets,iPhone etc.

      Regards Humphrey

  5. philip

    November 10, 2014 at 5:33 am

    Congratulations Mr. humphrey, more grease to your elbow.

    • Humphrey Kimathi

      November 10, 2014 at 1:54 pm

      hahaheee...that's a good one Philip.

      Regards Humphrey

  6. Jairo Cuellar

    November 12, 2014 at 11:46 am

    Thank you, Humprey for your book i just bought it and look very interested,i just wanders if you make books
    for cloth washing machine and cloth dry machine.
    Thank you
    Jairo Cuellar

    • Humphrey Kimathi

      November 12, 2014 at 9:07 pm

      Hi Jairo,
      Thanks for your feedback and thanks for buying my product, regarding books on washing machine and dry machine? sorry i have not written on that.
      regards Humphrey

  7. Robert

    December 5, 2014 at 6:17 pm

    Hi Humphrey,
    I just purchased your e-book. It has many good tips. I'm glad to add it to my collection.

    • Humphrey Kimathi

      December 8, 2014 at 9:13 pm

      Hi Robert, thank for buying my product Robert,glad to note you have found it a useful companion at your work bench. all the best!
      regards Humphrey


    July 2, 2015 at 10:03 pm

    Do I need to buy one book or both in order to be good in CRT repair?.In short which book would you recomend me to buy first?.
    Thank you

    • Jestine Yong

      July 3, 2015 at 9:48 am

      HI Joseph,

      Get this ebook first: then ask support from him so that he can guide you.


  9. george ngulube

    August 19, 2015 at 1:56 am

    Have enjoyed reading the crt contents in that book.All what i need is all E-books for electronics.Can you guys give me the total figure for the all books for electrons?

    • Jestine Yong

      August 20, 2015 at 10:03 am

      Hi George,

      I suggest that you visit this link and choose the ebook you want to buy. After that send an email to me.



  10. Musembi

    January 5, 2016 at 6:03 pm

    Hi Mr. Humphrey Kimathi.

    Am from Kenya and what am humbly requesting is whether you can teach someone about electronics. To be specific, to me practicals is what I need most.

    Thanks in Advance.

  11. mugisa

    February 22, 2016 at 10:06 pm

    hi humphrey,its quite unfortunate that we people in uganda have nt had any access to such books not even in our renowned bookshops. can u send a copy to uganda,kampala after full payment?

  12. Raphael Kachingwe

    April 4, 2016 at 11:44 pm

    Help me with this book please...!

    • Jestine Yong

      April 5, 2016 at 9:50 pm

      Hi Raphael,

      You can buy the ebook from the link provided at the end of that post.


  13. Jonathan

    May 9, 2016 at 7:54 pm

    Hi I'm new here. I like the good work you are doing , i hav a little problem with a dvd player whose lense i was replacing. Everything was going fine until i inserted a disc to test the drive.The loader didn't close as it seemed stuck.I would like to know how to set the loader so that it can open and close normaly....any help please ???

    • Ahmed

      October 10, 2016 at 6:39 am

      sir my china tv problem picture tube screen green and nagative picture sound ok


    June 25, 2016 at 1:27 pm

    Kimathi iam Kenyan iam interested in electronic repair I leave in Nanyuki 200kms North of capital city Nairobi.... This is my passion...please advice me accordingly... thanks

  15. stan Salamba

    August 10, 2016 at 5:19 pm

    where can I get mr Kimahi`s book here in Malawi?

    • Jestine Yong

      August 10, 2016 at 10:09 pm

      Hi Stan,

      His book is an ebook thus you will not find it in any bookstore. You need to contact him to get his ebook online.


  16. girmachew

    August 22, 2016 at 1:28 pm

    hello Mr.
    Am girmachew and I want to buy in Ethiopia. so do I can bought your book. pls help me

    • Jestine Yong

      August 22, 2016 at 5:56 pm

      Hi Girmachew,

      You can visit Humphrey's website and contact him. He will tell you how to get his ebook.


  17. Elliot

    January 6, 2017 at 1:18 pm

    Hi Humphrey my name is Elliot I have have this China crtv which I'm repairing tthe problem was the power supply which kickoff manage to fix it thanks to your ebooks and also there was a ceramic capacitor 471 2k which was totally burned .After I changed it I checked all the other circuits around and the voltage on the FBT it was 110v .But when I switch it on it just stays on standby what could be the problem the standby led is on please can you help me ? Thanks

  18. marc mphepo

    October 7, 2017 at 5:05 am

    mr kimath and mr justine eish ....ur the greatest in the field .i would like to thank u for ur humble and help .im getting where i want to be because of u .be blessed

    • Jestine Yong

      October 7, 2017 at 9:46 am

      Hi Marc,

      You are welcome.


  19. Sunshine

    November 4, 2017 at 6:46 pm

    good morning Sir.... sir I have a TV CRT model 21SA6RG if I power the TV it will boast and drop at that moment the red light will on and off immediately pls help... but if I connect external power board, it will boast normal... I have changed the ic with this number STR w6554 and some resistors in its power board please help me

  20. Godwin

    November 8, 2017 at 9:20 am

    Hello Sir
    My CRT TV is showing red light indicator but sparking around where the flyback transformer head cap is connected. What will I do sir.

  21. Prem

    October 10, 2018 at 7:44 pm

    Hello sir..
    I have samsung 21 inch ultra slim crt tv problem is that H pulse is not constant like, for two second it remain 0.33volt and then increase to 0.56volt and again decrease to 0.33 volt this cycle continues....when its volts is 0.33 flyback try to turn on but when 0.56 comes it stop again...what could be the problem??? And i change the smd ic also but same problem

  22. Godwin Nelson Ebong

    February 17, 2019 at 5:57 am

    Am finding it difficult to download.the CRT TV textbook

    • Jestine Yong

      February 19, 2019 at 12:30 pm

      Hi Godwin,
      Once you have paid for the ebook and have problem in downloading it then you need to contact the author. His email can be found in the receipt that has been sent to you.


  23. dennis rollo

    July 27, 2019 at 11:15 am

    sir how much will it cost me this crt book.from philippines.thnx

    • Jestine Yong

      July 28, 2019 at 6:21 pm

      Hi Dennis,

      It is USD34.00



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