No Power In Samsung LCD TV Repaired

By on October 30, 2014



samsung lcd tv repairings

 

 

 

 

 

 

 

 

 

 

 

 

One of the clients in my company called me to check on his 65” Samsung LCD TV and the complaint was no power. I went to his villa and tested the LCD TV and the problem was indeed “no power”. The challenge that I had was about removing the LCD TV from the wall. I managed to remove it and placed it on a soft surface. After that I removed all the screws and successfully opened the back cover.

samsung lcd tv repairsamsung lcd tv repairs

The first component that I have checked was the main fuse and it was tested good. I further checked the main filter capacitor and there was 300VDC.

I continued to check on the standby power supply area and found a resistor 2.2 Ohm open circuit. This resistor was connected to the source pin of the TNY264PN IC (8 pins). All corresponding components were checked to be good. Since I do not have this part number I have used another part number TNY266PN.  TNY266PN has higher specification than TNY264PN- see the below picture:

tny264pn

 

samsung lcd tv repairingsamsunglcdtvrepair

After the replacement of the resistor and the power IC the LCD TV was brought back to life again.

This article is contributed by Fernando Frias from Abu Dhabi UAE. He is currently working in a Technologies company as a technician.

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If you want to know the basic of LCD TV please click on the below link:

http://electronicrepairguide.com/lcd-tv-repair-basic.html

 

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40 Comments

  1. ctctec

    October 30, 2014 at 9:09 pm

    that look like a52inch sharp .it's a normal problem

    Likes(3)Dislikes(0)
  2. Yogesh Panchal

    October 30, 2014 at 9:21 pm

    Fernando Frias , Nice Job done congratulations!!!

    Likes(4)Dislikes(0)
  3. Sethu ramachandran

    October 30, 2014 at 10:09 pm

    Hai Fernando Frias ,

    Good job ... keep sharing in this blog.

    Likes(2)Dislikes(0)
    • Amir Mukhtar

      November 6, 2014 at 3:52 pm

      Good Advise.
      Thanks you

      Amir Mukhtar

      Likes(0)Dislikes(0)
  4. beh

    October 30, 2014 at 10:32 pm

    FERNANDO: as you told the big challenge for servicing the big size lcd/led
    is you need some one to help you to bring down the tv from the wall or from the the stand second challenge you need TIME to open all screws to reach to broad third if the problem is found in psu you are lucky 90% you can fix it but if the problem of tv is in main broad or T-con you can not fix it in the resident of your client other wise you have to bring the main board or T-con same model with you fourth if you want to bring the tv to your company or your shop for repair you will need a big car to handle the case also this require invest... so and so..........

    Likes(5)Dislikes(0)
  5. Humberto

    October 31, 2014 at 12:19 am

    Well done, another set saved from the dump

    Likes(2)Dislikes(0)
  6. mustabz

    October 31, 2014 at 1:08 am

    its so damn new, what could have caused it to fail in such a short period? do you think its a factory defect??? or was it running on a gen set?
    yrs curious

    Likes(1)Dislikes(0)
  7. Osman AlSinnary

    October 31, 2014 at 1:34 am

    Good Job ...

    Likes(0)Dislikes(0)
  8. Corriete

    October 31, 2014 at 1:53 am

    wonderfully done.appreciate this

    Likes(0)Dislikes(0)
  9. sultan ahmed khan

    October 31, 2014 at 2:43 am

    I have been seeing this web site since 1 year. In a week one 0r two posts of rectifying electronic gadgets i receive and intrestingly I see all of them. One day my company's CPU SMPS had burst. I bought a new one and replaced, but the old one I opened to check, there I found main 2 Capacitors and a small found bulged and busted.
    Slowly I removed and replaced new capacitors of the same value and got the SMPS back to life. Hats off to Justine Yong from him I inspired. Thanks.

    Likes(1)Dislikes(0)
  10. Mark

    October 31, 2014 at 4:23 am

    Hey Fernando,

    Nice job. Well written and explained.

    Likes(0)Dislikes(0)
  11. Abdul

    October 31, 2014 at 9:19 am

    Thank you.
    I appreciate your sharing.
    Hope to see more from you.
    Abdul(Singapore)

    Likes(1)Dislikes(0)
  12. Waleed Rishmawi

    October 31, 2014 at 10:43 am

    how did you come to the conclusion that the ic was bad? was it just speculations or you actually tested it? because it is not mentioned in the article.

    Likes(1)Dislikes(0)
    • Robert

      October 31, 2014 at 10:16 pm

      In the picture it looks like it has a hole burnt in the top of the power IC. I may be wrong.

      Likes(0)Dislikes(0)
      • Amendar

        November 1, 2014 at 1:03 pm

        Yes it seems a hole on it, nice point Robert.

        Likes(0)Dislikes(0)
      • Paris Azis

        November 1, 2014 at 7:50 pm

        Dear Robert

        This "hole" in the top of the IC is nothing but an additional marking of the manufacturer, indicating pin no 1 of the IC. Many manufacturers are using the same marking method.

        Likes(0)Dislikes(0)
        • Robert

          November 2, 2014 at 6:01 pm

          Hi Paris,
          Yes, I know. But it looks like a black spot inside the spot.

          Likes(0)Dislikes(0)
  13. Joshua Oloo

    October 31, 2014 at 12:01 pm

    Nice article.thanks for sharing.cheers

    Likes(0)Dislikes(0)
  14. biruk aweke

    October 31, 2014 at 12:54 pm

    HI Mr. Fernando It is so good repair and nice explanation thanks for sharing BIRUK FROM Ethiopia.

    Likes(0)Dislikes(0)
  15. moshe

    October 31, 2014 at 1:36 pm

    nice fernando, thanks for sharing...but as waleed says, how did you discover the ic was bad??

    Likes(0)Dislikes(0)
  16. jasfer

    October 31, 2014 at 2:18 pm

    What's the main reason of LED TV Samsung Brand.With Audio sound but no Video on screen?

    Likes(0)Dislikes(0)
    • lester

      November 8, 2014 at 1:37 pm

      check the led driver board

      Likes(0)Dislikes(0)
  17. george

    October 31, 2014 at 4:09 pm

    Hi fernando nice job another repair guide for technicians...by the way im george here in dubai work as tecnician in one of amusement company here.i would just want to know how did you get your esr meter from jestine and how much did it cost you including courier.
    Thanks

    Likes(1)Dislikes(0)
  18. Mircea

    October 31, 2014 at 4:29 pm

    Nice job! Hi Fernando!

    Likes(0)Dislikes(0)
  19. Andre Gopee

    November 1, 2014 at 1:07 am

    Nice Job, Keep up the good work. Why did you change the IC? Did you test it before?

    Likes(0)Dislikes(0)
  20. shahid ahmad

    November 1, 2014 at 1:32 am

    goood

    Likes(0)Dislikes(0)
  21. Niyaz

    November 1, 2014 at 1:42 am

    Could you please let us know how did to know the IC was faulty?

    Likes(0)Dislikes(0)
  22. michael Dacres

    November 1, 2014 at 2:18 pm

    great job

    Likes(0)Dislikes(0)
  23. beh

    November 2, 2014 at 12:46 pm

    .. by testing the voltages on the pins of ic he found out that the ic is not good that is all.........

    Likes(2)Dislikes(0)
  24. l.boopathiraj

    November 2, 2014 at 9:24 pm

    good job

    Likes(0)Dislikes(0)
  25. syphou

    November 4, 2014 at 9:09 am

    I repair blog power of dvd portable but can not ic that broke
    number of ic JH 8100 and have not ic for change .I have not diagram pleae brother help instructions

    Likes(0)Dislikes(0)
  26. daniel osiobe

    November 5, 2014 at 2:28 am

    how did you come across the site for the equivilent i.c in which you used to replace the old one.

    Likes(0)Dislikes(0)
    • lester

      November 8, 2014 at 1:34 pm

      google your part number,click on dealer spec sheet page then look at similar part numbers for an equal or higher tolerant part, many electronic part suppliers out there.

      Likes(1)Dislikes(0)
  27. Amir Mukhtar

    November 6, 2014 at 3:54 pm

    Thank You Mr. Fernando Frias

    Good Article and Please Keep more sharing your Experiences to Learn Repair and its Solutions.

    thanks you
    Amir Mukhtar Ashrafi

    Likes(0)Dislikes(0)
    • Fernando Frias

      December 13, 2014 at 6:00 pm

      Thanks Mr. Amir sorry for delayed
      replay I hope it's clear for you all the details of troubleshoot

      Thank you,

      Fernando

      Likes(0)Dislikes(0)
  28. Pete Singh

    December 9, 2014 at 1:27 am

    Hi Fernando
    What component you tested to pin point out that IC was bad and it needs replacement?

    Likes(1)Dislikes(0)
    • Fernando Frias

      December 13, 2014 at 5:52 pm

      Hi Mr.Pete thanks your question!but first of all I am so sorry for delayed answer because I am not open my email long time from last October end of the month.My company we had a couple of project so I don't have time to open my personal email because I am using my outlook email in the company,so about your question regarding to pin point the problem of the ic actually I am using only my analog tester when I started to trouble shoot from primary to secondary supply I found the fuseble resistor is open I trace the connection of that resistor it's going down to HV of the regulator that I've mention above although this IC is having 7 pins but only 3 pins are working from pin 1 there is ceramic connected to pin 8 and pin 2,3,7 and 8 are connected to the negative ground of mother Capacitor and pin 5 is connected to primary transformer and pin 4 is connected to optocoupler for trigger the power so that means there is diode reading between the ground and pin 5 when I am using my tester to check both pins are shorted so i conclude that's why the fuseble resistor is open because of this shorted since I don't have the same part number I replaced the higher one number of ic and I never found another component there is problem so I hope it's clear to you how can I pin point the problem of the TV.

      Thanks

      Fernando

      Likes(0)Dislikes(0)
  29. Josué

    January 8, 2015 at 1:08 am

    Thanks researching thought and I appreciate people like you.

    Likes(0)Dislikes(0)
    • admin

      January 8, 2015 at 9:16 am

      Hi Josue,

      You are welcome!

      Jestine

      Likes(0)Dislikes(0)
  30. Chris

    December 29, 2016 at 6:43 am

    Where can I get the exact same parts you used?

    Likes(0)Dislikes(0)

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