Guest Post- SAMSUNG 32″ LCD TV LA 32R91B IS REPAIRED.

By on April 30, 2013



lcd tv repair samsung

samsung ld tv repairedlcd tv repair samsung

All the functions of this lcd tv were good except  the contrast and brightness controls. When I decreased the contrast and brightness to 50 %, after few minutes it automatically shot up again to 100%. My first suspect was the corrupted program file of EEPROM IC . Since I do not have the original programs I tried to check on the voltages to see if the voltages stable or not.

samsungtv2

 

repair lcd tv

I measured the output voltages from the power supply and found two voltages were good (13v and 12 v). But the 5 volt line seems to be unstable and fluctuated. After that I saw an electrolytic capacitor that was bulged located along the 5 volt line.

bulged ecaps

The cap value was 2200 micro farad @ 10 volt 105 C and when tested with my capacitance meter it showed only 32 micro farad. The capacitance value was way out. I checked the same capacitor again with my ESR meter and it showed 2 ESR ohm. By right it should have about 0.02 ESR ohm. After a new replacement was done the control functions of the contrast and brightness  of the TV was back to normal again.

samsungtv5

Note:  I changed the bad cap with new one.   2200micro @ 16volt 105 c   and this works with no problem.

Conclusion : An  exact  and stable voltage is a must for the supply of microcontroller IC.

Enjoy repairing

beh iran

 

 

 

Beh from Iran

 

Hope you have enjoyed this repair article by Beh and please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

Jestine Yong

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56 Comments

  1. Balkrishna

    April 30, 2013 at 6:17 pm

    thanks jestine , i hav been reading your news letter since last four year your post have always useful information

    thanks for your dedicated posts for electronic which help us

    regds

    Balkrishna

    Likes(0)Dislikes(0)
    • Jestine Yong

      April 30, 2013 at 7:28 pm

      Hi Balkrishna,

      You are welcome!

      Jestine

      Likes(0)Dislikes(0)
  2. ADEFRIS

    April 30, 2013 at 7:26 pm

    IT IS NICE TO HERE U

    Likes(0)Dislikes(0)
    • Jestine Yong

      April 30, 2013 at 7:28 pm

      Hi Adefris,

      Thanks.

      Jestine

      Likes(0)Dislikes(0)
  3. mosab guedira

    April 30, 2013 at 7:29 pm

    dear sir
    do u have corses of how to repair GSM & Laptop and thanks

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 1, 2013 at 3:30 pm

      HI Mosab,

      Sorry we do not have such courses.

      Jestine

      Likes(0)Dislikes(0)
  4. dondonis

    April 30, 2013 at 10:39 pm

    Glad to know that your blog has been repaired. Thanks and more power to you Jestine.

    Likes(0)Dislikes(0)
  5. Labsertec

    April 30, 2013 at 10:58 pm

    Hola Jestine Yong:
    Gracias por toda esta información técnica de mucha utilidad.

    Likes(1)Dislikes(0)
  6. Joshua

    April 30, 2013 at 11:04 pm

    That's so great to hear that. Thanks for helping in solving such cases. Personally, I appreciate.
    Joshua,
    Uganda

    Likes(0)Dislikes(0)
  7. nelson hernandez

    May 1, 2013 at 3:21 am

    hey Jestine,nice to see you again,thanks for the new article.

    Likes(0)Dislikes(0)
  8. victor 4rm lagos

    May 1, 2013 at 4:15 am

    Good work & time dedication yong.thanks.

    Likes(0)Dislikes(0)
  9. james

    May 1, 2013 at 8:44 am

    COMMENT POURAIS-JE VENIR POUR SUIVRE UNE FORMATION SUR PLACE AU PRES DE TOI ?

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 1, 2013 at 9:20 pm

      HI James,

      Just visit the website http://www.noahtechelectronicstraining.com for more information.

      Jestine

      Likes(0)Dislikes(0)
  10. Amri

    May 1, 2013 at 2:33 pm

    thanks for sending us good articles

    Tanzania

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 1, 2013 at 10:01 pm

      Thanks to all

      Jestine

      Likes(0)Dislikes(0)
  11. jhonny

    May 1, 2013 at 3:09 pm

    jestine there is only in ingles be cos i need in espanish please

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 1, 2013 at 3:30 pm

      Hi Jhonny,

      Try use Google translation to translate the website to Spanish.

      Jestine

      Likes(0)Dislikes(0)
  12. Mohammed Kasim C M

    May 1, 2013 at 5:01 pm

    Thanks for the valuable article. Is it a way to check whether it is a software problem or hardware problem for this case?

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 1, 2013 at 10:04 pm

      HI Mohammed,
      It depends on the problem. If the hardware no problem then you have to suspect software/firmware.

      Jestine

      Likes(0)Dislikes(0)
  13. mansoor

    May 1, 2013 at 6:47 pm

    good to here you've retrieved your website thanks for the information you've been giving me though am an electrician i find it useful since it makes me repair few electronic gadgets. Do you have a school where you train people to become expert in electronic repairs?
    i would like to enrol and how much would it cost me?

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 1, 2013 at 9:19 pm

      Hi Mansoor,

      Yes you can visit the website at http://www.NoahtechElectronicsTraining.com for more information

      Jestine

      Likes(0)Dislikes(0)
  14. Henry

    May 2, 2013 at 12:24 am

    Hi Beh, that was a very good trouble shooting you did there, but let me ask, what of people without esr meter, how will they get good reading of capacitors? secondlty can anyone tell me how to convert pal to ntsc, i have just received samsung 60' lcd with one system.
    Henry

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 3, 2013 at 10:07 am

      Hi Henry,

      They must have otherwise they would not know if the e-cap is good or bad. Or they can just direct replace and retest. Nowadays ESR meter is not expensive and every repairers should own one. As for the conversion sorry i do not have info on this.

      Jestine

      Likes(0)Dislikes(0)
      • Austin

        May 6, 2013 at 4:58 am

        Hi Mr Yong in respond to the question asked how to detect a fuulty cap without an ERS meter particularly in switch power supply, mesurement of the voltage at that point always show lower than normal voltage also a scope will show high waveform almost as high as that at the input of the rectifier.
        Substituting with a known good cap of equal value and voltage will confirm doubt

        Likes(1)Dislikes(0)
        • Jestine Yong

          May 6, 2013 at 2:47 pm

          HI Austin,

          You are right but in many cases it would cause no power and there is no chance for you to perform voltage/signal test with your meter or scope. Having the ESR meter is still a better way in finding those bad e-caps without turning the power on.

          Jestine

          Likes(0)Dislikes(0)
  15. teboho

    May 2, 2013 at 5:13 am

    hi jestine thank a lot by helping us and im so happy that you being able to repair your blog thanks

    Likes(0)Dislikes(0)
  16. Benyamin Hosseini

    May 2, 2013 at 6:29 am

    Thank you for everything .

    Likes(0)Dislikes(0)
  17. francoise

    May 2, 2013 at 1:56 pm

    thanks for additional information that you have been given to us.and we are glad that you have been back and post an article in your blog.

    Likes(0)Dislikes(0)
  18. Joe Hana

    May 3, 2013 at 12:06 am

    Thankyou sir....you much give me knowledge for sending article

    Likes(0)Dislikes(0)
  19. corriete

    May 3, 2013 at 4:59 am

    I was so happy that your blog was restored. Whilst some repair others destroy. They can't prevail.Glad you are a great helper.

    Likes(0)Dislikes(0)
  20. Prakash Patel

    May 3, 2013 at 11:24 am

    Hello Jestine,
    Your newsletter are really useful.

    Likes(0)Dislikes(0)
  21. Samir Das

    May 3, 2013 at 4:41 pm

    It is really very good and I got new idea from it thanks sir.

    Likes(0)Dislikes(0)
  22. Abdoulie Bah

    May 3, 2013 at 9:33 pm

    Thanks for the good work you doing and kind mind you got to share your ideas with us.

    Likes(0)Dislikes(0)
  23. abbey

    May 3, 2013 at 10:43 pm

    Thank u so much for this piece of information. I luv it !

    Likes(0)Dislikes(0)
  24. ansumana sesay

    May 5, 2013 at 8:07 pm

    thank you for your relentless effort that you have been sending various information to people all over the world may God grant you more wisdom so that you will continue to share tis knowledge to the rest of mankind.

    Likes(0)Dislikes(0)
  25. zed

    May 5, 2013 at 8:41 pm

    great repair beh. Thanks sir jestine for posting this article by beh.

    Likes(0)Dislikes(0)
  26. yudi

    May 5, 2013 at 8:52 pm

    thx u so much for information, you had gave alot of knowledge for me

    Likes(0)Dislikes(0)
  27. Henry

    May 7, 2013 at 5:58 am

    I repair Samsung Plasma screens and this tip was excellent,,,, added to my samsung flat screen experience and knowledge.

    Likes(0)Dislikes(0)
  28. Peter

    May 7, 2013 at 10:56 pm

    Thx beh and Jestine for sharing ur experience.

    Likes(0)Dislikes(0)
  29. maya

    May 9, 2013 at 9:57 pm

    Thanks and more power to you

    Likes(0)Dislikes(0)
  30. kevin

    May 10, 2013 at 3:55 am

    Great blog,I had a similar problem with a polaroid 50 inch,the power just went off,found out it was the four main caps,why do these big manufactures use substandard components. Replaced them with the same farad value but slightly higher voltage rating,no problems since.
    thanks Jestine

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 10, 2013 at 10:48 am

      HI Kevin,

      Most probably is the overall manufacturing cost. This is why my friend that sell TVs told me that nowadays LCD TVs quality was not as good as those days. By the way, if they fixed good and long lasting capacitor we may have less repair work to do.

      Jestine

      Likes(0)Dislikes(0)
  31. Patrick

    May 11, 2013 at 6:12 pm

    I think your articles are amazing

    Likes(0)Dislikes(0)
  32. Ganesh

    May 16, 2013 at 2:11 pm

    thanks jestine Sir, i have been reading your news letter since the day i heard from the website ads your post have always useful information

    thanks for your dedicated posts for electronic which help us

    regards
    Ganesh

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 16, 2013 at 3:44 pm

      Hi Ganesh,

      You are welcome!

      Jestine

      Likes(0)Dislikes(0)
  33. kingsley

    May 16, 2013 at 9:19 pm

    jestine yong you are doing a great job. you are a blessing to our generation. knowing you through the internet is the greatest thing that has ever happened to my me in my engineering career. i wish you could come to my country, NIGERIA to establish electronics engineering company, we will be glad to have you. i want to buy every book you have written on electronics guide and repair. pls send me list and price and the quickest way of making payment so that i can have them. and thanks for all the electronics news letter; they have been helpful.

    Likes(0)Dislikes(0)
    • Jestine Yong

      May 17, 2013 at 10:39 am

      Hi Kngsley,

      You are welcome and I have sent an email to you.

      Jestine

      Likes(0)Dislikes(0)
  34. Amir Mukhtar

    May 22, 2013 at 1:39 pm

    Dear Beh
    Iam very Glad and Thankfull to you for your valuable and Learnable article sharing.
    Also, i do appreciate your positive approach for new comers and daily experienced getters who is is field but want to learn new updates comings.
    Thanks you again Mr Beh and Mr. Jestine.
    A small Electronic Repairer
    Amir Mukhtar

    Likes(0)Dislikes(0)
  35. beh

    May 25, 2013 at 1:50 am

    HI AMIR
    you are welcome . and thanks for supports.
    beh

    Likes(0)Dislikes(0)
  36. beh

    May 25, 2013 at 1:53 am

    HI ZED
    you are welcome . and thanks for supports.
    beh

    Likes(0)Dislikes(0)
  37. beh

    May 25, 2013 at 1:55 am

    HI ALL
    thanks you all .
    beh

    Likes(0)Dislikes(0)
  38. peter djuh

    July 19, 2013 at 10:09 pm

    thank you for that wonderful article Mr BEH, Its so inspiring,GOD bless you.

    Likes(0)Dislikes(0)
  39. reza

    September 10, 2013 at 9:10 pm

    hi mr beh
    your article was very good
    i love repair lcd tv
    i utilize your article

    Likes(0)Dislikes(0)
  40. PRUDENCIO G. PERITOS JR.

    October 6, 2013 at 7:05 pm

    thank you so much for your very interesting articles with regards to TV troubleshooting ideas.

    Likes(0)Dislikes(0)
  41. beh

    February 12, 2014 at 4:15 pm

    HI PRUDENCIO G. PERITOS JR.
    You are most welcome
    beh

    Likes(0)Dislikes(0)
  42. beh

    February 12, 2014 at 4:17 pm

    HI peter djuh
    you are most welcome
    beh

    Likes(0)Dislikes(0)

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