No Tuning and Channel Stored In TV Solved

By on August 13, 2015
tvtunerrepair

 

 

 

 

 

 

 

tunerrepair

The complaint of this Singer CRT TV was no tuning and channel stored. No matter how hard you try to tune to the UHF and VHF channel, you still won’t be able to lock on the screen. So what you can see from the TV screen was just the snowy picture-see the below photo.

tuner repair

In order to confirm if it is really the tuner fault, one has to download the Tuner schematic and perform the voltage test. I can’t find the exact diagram so I’m using another TV model for reference.

The first step is to open the cover and access to the tuner. Next, you need to power On the TV and check the AGC, VHF-H, UHF, BM and etc pins. All the voltages seem to be within the specification.

tuner if schematic

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Since all the Tuner pins voltages are within specification so I can now assume the Tuner is the cause of the problem. In my workshop I have a similar TV  (working unit) so I removed the Tuner and replaced it.

tunerrepair6

Guess what? The TV now can be tuned and the channel can be stored-see the photo below. My repair job is done.

tunerrepair7

 

 

suranga

 

 

 

 

 

 

 

This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.

 

Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

P.S-  If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!

 

You can read his previous article in the link below:

http://www.jestineyong.com/no-power-in-toshiba-led-tv-repaired/

 

 

Likes(155)Dislikes(0)

31 Comments

  1. George

    August 13, 2015 at 10:30 pm

    Good job, Suranga.
    How incredibly lucky you were to have an identical TV in your shop. What are you going to do with your newly broken TV now?

    Likes(9)Dislikes(0)
    • Marvin

      August 14, 2015 at 9:07 pm

      Have you try to see for dry joint in the tuner. This was a common fault for sony CRT T.v

      Likes(3)Dislikes(0)
      • Suranga Electronics

        October 26, 2015 at 2:12 pm

        I repaired Some Tuner Replacing IC. But Not Come Drying Solder this Type Tuner. Thanks !!!!!! your comment.

        Likes(1)Dislikes(0)
  2. Albert

    August 13, 2015 at 10:53 pm

    I have at least 5 older CRT tv's portable Color and B&W (60's and 70's models) that I wanted to give to anyone that wants them in perfectly working condition. But nobody wants them. It would give me some space back. And since they are perfectly working, I just hate to throw them away. It would be a real shame since I also repaired them in the past by replacing the defect components.

    Likes(4)Dislikes(0)
  3. Martin

    August 13, 2015 at 10:53 pm

    Now you just need to repair the tuner and document it for us to see 😉

    Likes(3)Dislikes(1)
  4. Yogesh Panchal

    August 13, 2015 at 11:43 pm

    Congratulations! Suranga for another fix.

    Likes(1)Dislikes(0)
  5. sagar sen

    August 14, 2015 at 12:22 am

    sir, is all tv have same problem when this symptom shown..

    Likes(0)Dislikes(0)
  6. Robert Calk

    August 14, 2015 at 12:37 am

    Good job, Suranga. Did you open the defective tuner and see what was wrong with it?

    Likes(3)Dislikes(0)
    • Suranga Electronics

      October 26, 2015 at 2:22 pm

      yes Mr i checked Tuner I re soldered and checked SMD parts But not Success

      i think it's IC defect. ic not available our market. ok thanks Mr. your Comment.

      Likes(0)Dislikes(0)
  7. hongkongpom

    August 14, 2015 at 3:54 am

    Hello there I liked the article very much but am confused.

    You say that the voltages on the tuner pins are all correct but then state that the tuner is faulty?

    If it was faulty wouldn't the pin voltages be incorrect?

    Thank you

    Likes(7)Dislikes(0)
  8. trevor

    August 14, 2015 at 6:05 am

    Good work.
    I try to repair the tuners if possible first, usually flip the can plates off and i find they are plagued with dry joints, rework worst solder joints with iron then i apply liquid flux and apply hot air from rework station to reflow pcb. Then i check for cracked or broken wire from rear of tuner socket to pcb then check dc block capacitor and clipping diodes.
    Then i change tuner if not a worker, tuners in thru plate boards are worse to remove.

    Likes(1)Dislikes(0)
  9. Joe

    August 14, 2015 at 8:22 am

    Great article, but I have a question.. If the voltages were within specs, then why replace the tuner, assuming you were testing the original tuner... otherwise great article...

    Likes(2)Dislikes(0)
  10. dicksy

    August 14, 2015 at 2:58 pm

    nice work suranga.well done .
    dicksy,colombo

    Likes(1)Dislikes(0)
  11. Mark Tembo

    August 14, 2015 at 3:30 pm

    Thanks for the article.

    Likes(1)Dislikes(0)
  12. bruno

    August 15, 2015 at 3:56 am

    Hello in your article you said all the voltages of tuner are within specs. Then you put in a tuner. confused

    Likes(2)Dislikes(0)
    • Almas Shahzad

      May 25, 2017 at 4:02 pm

      I think these voltages are input but not output

      Likes(0)Dislikes(0)
  13. BIRUK AWEKE

    August 16, 2015 at 3:39 pm

    Good job &explanation thanks.

    Likes(1)Dislikes(0)
  14. Humberto

    August 20, 2015 at 12:49 am

    Good repair Suranga. Explanations are excelent. Congratulations.

    Likes(1)Dislikes(0)
  15. aziz ola

    August 20, 2015 at 12:15 pm

    thank you jestine yong your website is very good

    Likes(1)Dislikes(0)
  16. wills

    August 20, 2015 at 6:04 pm

    thanks for your explanations

    Likes(0)Dislikes(0)
  17. Ravindra

    November 11, 2015 at 11:20 pm

    I have LG Flatron tv.during tune that tv display some channels.but after tuning not stored any channel.

    Likes(0)Dislikes(0)
  18. Prasanna Wasalathanthri

    May 30, 2016 at 8:37 pm

    Thanks Bro, God Bless You

    Likes(0)Dislikes(0)
  19. Niro

    June 17, 2016 at 10:21 pm

    Great job and thank you very much for sharing your valuable knowledge with us.

    Likes(0)Dislikes(0)
  20. shanaka

    July 21, 2016 at 12:34 pm

    i have sony 29 crt tv the tv have a no snow & no tuning the channel and audi muting work is av dune but no sound ple. tel me a matter

    Likes(0)Dislikes(0)
  21. sagar

    September 20, 2016 at 1:36 am

    Sir, I have a CRT TV make lg company the problem is that I m unable to store any channel only snow dots in my tunner there is SDA and Scl pin which come fro 24f16 memory ic , sir is this my tunner problem, all voltages are OK there is no B1 Or B2 plz help

    Likes(0)Dislikes(0)
  22. Md s islam

    January 13, 2017 at 8:43 am

    sir how are you? sir i am change an tuner but my tv is on screen display whene i tuning the tv but not any chanel please an solution this

    Likes(2)Dislikes(0)
  23. Chaminda

    September 1, 2017 at 5:23 am

    Dear Suranga,
    Please clarify what BM pin is.

    Thanks

    Likes(0)Dislikes(0)
  24. Belief tamang

    January 3, 2018 at 8:36 pm

    No village in tunner

    Likes(0)Dislikes(0)
  25. Sumith

    February 17, 2018 at 10:03 am

    I have singer led tv 19 inch only flashing singer logo display cannot on can u help.thanks

    Likes(0)Dislikes(0)
  26. AMIR

    June 15, 2018 at 5:38 pm

    DOES UR TV LED INDICATOR FLASHES 5 TIMES? DOES ANYBODY KNOWS WHAT IS THIS MEANS?

    Likes(0)Dislikes(0)

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