No Display In Samsung 32″ LED TV Repaired

By on April 3, 2017
how to repair led tv backlight problem

 

 

 

 

 

 

 

 

 

 

SAMSUMG 32'' LED TV no display

This Samsung 32″ LED TV came in for repair with the complaint of no display. When i used a torch light to shine at the panel, I could see faint picture (TV Channel logo). This means the power section, mainboard and even the panel are good.




The problem is either the LED backlight or the LED driver circuit. The photos below are the mainboard and power supply board. The LED driver board is built into the power supply board.

fix led tv

repair led tv

I have checked the dc voltage to the LED backlight and found that the DC voltage came and dropped back to zero. This indicated there was problem with the backlight LED. If one of the LEDs in the backlight strip have problem the voltage will drop.

fixing led tv

Next, I dismantled the panel and you must take great care of it otherwise if  the TAB bonding breaks, it would be difficult to repair it unless if you have a special machine for this.

how to replace led tv backlight

how to check backlight led

I checked each LEDs and found only one that was not lighted at all when test it with meter set to diode mode.

how to test led backlight

bad led tv backlight

I do not have the ready part for this LED so I installed a used LED from another junk LED TV .

led tv backlight replacement

Once the LED is fixed and powered On, take a look at the photos below:

how to repair led tv backlight

how to fix led tv backlight problem

Conclusion- It is not tough to repair LED TV with dim display problem. Just follow my procedure and I believe you can repair it very fast. If you want to be good in repairing LCD/LED TVs, you can check out Kent’s ebook here.

 

suranga

This article was prepared for you by Suranga Bandara who owns an Electronics repair 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. If you have electronic repair articles to share with us, please contact us HERE.

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!

Note: You may check out previous post about fixing active speaker in the below link:

http://jestineyong.com/horizontal-line-problem-in-crt-tv/

 

Likes(164)Dislikes(1)

11 Comments

  1. Parasuraman S

    April 3, 2017 at 10:34 pm

    A Good repair work! Information shared is very useful!

    Likes(3)Dislikes(0)
  2. Albert van Bemmelen

    April 3, 2017 at 11:48 pm

    Because of the TAB bonding I've not done such a repair myself yet. In my opinion TVs with backlight problems are just not made to fix without greater risk of extensive damage. So well done Mr.Suranga!

    Likes(3)Dislikes(0)
    • suraga Electronics

      April 4, 2017 at 8:13 pm

      Hi. Mr- Albert van,
      Thank you so Much !

      Likes(1)Dislikes(0)
  3. James

    April 4, 2017 at 1:52 am

    So did you let them know you had used a second hand part and informed them that there is a possibility that because you had fixed the tv with a used part that it might happen again. And also did you give them a discount for using a used part and not a new one

    Likes(3)Dislikes(2)
  4. angelo

    April 4, 2017 at 5:53 am

    thank you sir

    perfectly done

    we all (the learners) appreciate the hard work
    of all of you (the experts)

    Likes(1)Dislikes(0)
  5. Des Gilham

    April 4, 2017 at 5:33 pm

    No need to inform a client of any funny thing regarding a second hand part.
    A repair has been carried out, immaterial. A Different diode could pop tomorrow! Same sympton, different part, same circuit!
    Well done repair wise!

    Likes(2)Dislikes(0)
  6. Luciano Khware

    April 4, 2017 at 5:37 pm

    Suranga,

    Thanks for sharing your repair experience. Keep it Up.
    Regards!

    Likes(1)Dislikes(0)
  7. Asif Gokak

    April 8, 2017 at 2:49 pm

    Hi

    I have a Sony Bravio EX72KDL46 model TV and 1 vertical line on full screen appears and the upper half screen shows multiple lines. So how can repair such problem. Please provide email ID I can send you the pictures of my TV.

    Regards

    Likes(0)Dislikes(0)
  8. reza

    April 12, 2017 at 1:13 pm

    Hi mr Suranga Bandara
    thank u

    Likes(1)Dislikes(0)
  9. Humberto

    April 13, 2017 at 2:07 pm

    Great repair Suranga.

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

    April 15, 2017 at 6:00 pm

    Good job, Suranga.

    Likes(0)Dislikes(0)

Leave a Reply

Your email address will not be published. Required fields are marked *