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LED TV T-Con Board Problem

By on October 6, 2017
display fault in led tv repair











display problem in LED TV

how to fix led tv

This 32″ Videocon LED TV came in with the complaint of many color vertical lines across the screen. Take a look at the two photos above. This kind of problem can be caused by bad LCD panel or faulty T-con board. In order to confirm that the LCD panel is not the cause of the problem you can actually press on the menu button.

If the OSD menu appeared then you know the problem is not in the LCD panel and T-con board is the cause. From my testing, the faulty part was the T-con board. I took out the T-con board for visual inspection and  found that one of the LVDS connector area had ant’s nest-see the second photo below:

led tv tcon board repair

how to repair led tv

What I had done was to clean the board with a brush and sprayed at the connectors with a contact cleaner. Next I reflowed the ICs with a SMD rework station.

fixing led tv

The T-con board now is clean and I had to hook it up to check if The TV will get back to normal.

how to repair and fix led tv tcon board

After putting everything back and powered it On, the problem still remained the same-see the photo below:

videocon led tv repair

This means the problem is either due to bad components, Improper DC supply or signals and etc where I need to troubleshoot and find it out. Initial testing of basic components and DC supply voltage were found to be good.

My guess was that one of the main T-con board ICs could have problem. The problem now is that my customer need this TV back urgently and I got no choice other than to buy a new T-con board from Ebay and fixed it-see the photo below:


Once the new board is replaced, the problem was gone and this had proved it was indeed the T-con board was the main culprit. If more time is given to me, I will perform an in-depth checking on this faulty board. I will first target the Main T-con board IC.

videocon led tv fix

Conclusion- All customer are different. Some are very demanding, some friendly and some don’t bother to take back their equipment even if the equipment is already been repaired. If you have run this kind of repair business for sometimes I’m sure you would be understood what I’m saying. All the best!



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

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  1. Randy Warren

    October 6, 2017 at 9:57 am

    "and some don’t bother to take back their equipment even if the equipment is already been repaired", so true! That is why I never repair a piece that I can't sell the piece on ebay or wherever to recoup all my costs on!

  2. Albert van Bemmelen

    October 6, 2017 at 2:40 pm

    Thanks for this interesting T-Con repair Suranga. I only wonder how you are able to buy a new T-con board from Ebay so quickly if the problem is that the customer needs his TV back urgently? Normally it at least takes a week or 2 before the ordered items arrive.

    • suranga Electronics

      October 6, 2017 at 6:44 pm

      Hi, Mr,Albert.

      Yes you are correct. I have bought this T-CON Board from online market about one year ago. I had been working for the last few years as a sub service agent for this brand of LED TVs. There were many over warranty tvs' with various display faults.

    • Suranga Electronics

      October 7, 2017 at 12:34 am

      Thanks Mr,Albert .

  3. Yogesh Panchal

    October 6, 2017 at 3:01 pm

    Good job! Suranga

    • Suranga Electronics

      October 7, 2017 at 12:35 am

      Thanks Mr.yogesh

  4. Claudemir.siqueira

    October 6, 2017 at 5:46 pm

    Muito bom.obrigado pela dica

    Very good.Thank you for the tip.

  5. Waleed Rishmawi

    October 6, 2017 at 7:54 pm

    i have an LG tv with similar problem but I can not see the menu therefore it is the bad panel. the customer does not want to be fixed. thanks for sharing.

    • Calum

      October 10, 2017 at 9:31 am

      check 12v regulator ic

  6. Steve

    October 6, 2017 at 8:02 pm

    Great repair article very informative as always.



  7. Justice

    October 6, 2017 at 9:16 pm

    T-con board and OSD mmmm, I'm still a long way to fully understand, but tnx for your wonderfull expirience.

  8. mahmoud_tajpour

    October 7, 2017 at 4:08 am

    Hi dear Bandara this repair was very very useful for me because I have two TV these are similar fault now I can repair these TVs thank you very much and hope you are happy and healthy.

    • Suranga Electronics

      October 8, 2017 at 1:09 am

      You are Welcome


  9. Parasuraman

    October 8, 2017 at 2:47 pm

    Excellent! How I wish I could be in your neighborhood so that I can learn many things from you!

    • suranag Electronics

      October 9, 2017 at 4:02 pm

      ok. Mr Parasuman,
      Thank you !

  10. Robert Calk

    October 8, 2017 at 4:21 pm

    Good job, Suranga. It would be interesting to know if the bad IC on that T-Con board had adhesive underneath it, like the ones that I always see, that would pull the top layer of the PCB off with it when you try to remove it.

    • suranga Electronics

      October 9, 2017 at 4:10 pm

      Hi. Mr Robert Calk,
      yes Some time May be that.

  11. Ali

    October 10, 2017 at 8:05 am

    Great job brother man.I have the same problem with 32inch sansui, but mine differs slightly.It switches on well i can see pictures, but after some few minutes it show the same image you have just shown us (vertical lines), at this moment all buttons are not functioning.aim puzzled.Wish for advise on where to check.Thank you.

  12. Tito

    October 12, 2017 at 6:40 pm

    Good job Suranga, but what if the tv is showing one vertical line, should the problem point to the t-con board also? Any help?

  13. nandhu

    October 24, 2017 at 5:56 pm

    good job ,in my Oneida 40" tv the panel and Tcon are connected by cof connector ,how can I seperate the board for replace

  14. Wayne

    April 17, 2018 at 8:48 pm

    Thank you for this diagnostic info. I have a toshiba 48" LED LCD Set in for repairs. Back light works but no picture or OSD Menu. 12v is reaching the T Con board. Any advice please. I suspect the T Con board but need to make sure.

  15. Jason Dorrington

    June 18, 2018 at 1:28 am

    Hi my tv is displaying a 3 to 4 inch section of vertical and horisontal lines at the top of my tv. Is this the T con board or ribbon that needs replacing. Thankyou in advance

  16. Yolanda Jonas

    January 11, 2019 at 8:14 am

    I have a Panasonic 32 inch needs a tcon board I think as I have the same issue I'm having problems listing a tcon board can u guys help tcon 32as600x

  17. Ramakrishnan. E

    September 9, 2019 at 11:00 pm

    good narration. suggestion is wealthy. very useful to technicians.

  18. vipul

    November 22, 2019 at 2:04 pm

    I have sony KDL-50w800c.I was facing same problem so i replace t-con board. After replacing T-con, issue is no picture but sound & slow dim white LED light. I talk to the supplier about the T-con issue, he asked to replace the encryption ship on the T-con board. I am not sure if i need to synchronize new T-con with BMX board. Can you please help me?

  19. Andre De Guerin

    June 3, 2022 at 5:08 pm

    Once had this fault where instead of lines it was noise, appearing in all the sub menus. You could still see something but it clearly wasn't right.
    Ended up finding a similar TV with a broken screen and simply swapping the LCD wafer itself, modifying the casing slightly to take the slightly wider cables for panel drivers and swapping T-Con board. Worked well!
    Essentially a free TV for basically my time.


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