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Bad EEprom 24C02 IC In LCD TV

By on November 28, 2019
lcd tv mainboard repair

 

 

 

 

 

 

 

 

LA37A450C1XZN lcd tv repair

I received this TV with no life and when I plugged in nothing happened just the front red LED was blinking and the TV did not turn on!




After opening the cover I faced with three PCB circuit boards such as power supply, main board and t –con board.

mainboard t con repair

First I started with power supply I checked all the output voltages

lcd tv power supply

lcd tv power supply board connector

I found all the output voltages to be good

In this model of Samsung TV, if power supply is good but TV does not turn on, the suspect is usually EEPROM- IC 24c02n and the program of this IC must have been corrupted.

24c02 ic

Since I have the master copy of this  EEPROM IC, by using an EEPROM programmer it was easy for me to overwrite the existing corrupted memory.

 




Once done the TV came back to life again

lcd tv repaired

 

NOTE 1: Since this TV was old, it took me time to resoldered all the bad joints

NOTE 2: I also replace some bulgy electrolytic caps from the power supply before checking the voltages

NOTE 3: LA series of this Samsung TV was assembled just to export to IRAN but same model with another prefix code (LN. Or LE..) were assembled to export  to other counties like USA and other countries

beh new

This article was prepared for you by Mr Beh from Iran




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Likes(67)Dislikes(1)

14 Comments

  1. Robert Calk Jr.

    November 28, 2019 at 2:58 pm

    Good job, Beh!

    Likes(3)Dislikes(0)
    • beh

      November 29, 2019 at 8:01 am

      Thanks Robert.

      Likes(0)Dislikes(0)
  2. Parasuraman S

    November 28, 2019 at 4:27 pm

    Good Job, Beh!

    Likes(1)Dislikes(0)
    • beh

      November 29, 2019 at 8:02 am

      Thanks, Parasuraman.

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

    November 28, 2019 at 4:56 pm

    Good thing that you could obtain the right master copy Beh! Collecting those Bios,Nand, Eeprom copies is easy on modern smart tv sets with the RT809H universal programmer. Just by connecting the RT809H with the VGA or HDMi cable to the tv and saving the content to the harddisk of the connected PC. But it often doesn't work on older monitor or tv's. They have to be opened to read any boot/bios/memory chip. But the RT809H this way also can read the post boot message log file on tablets and laptops to help discover where the device gets stuck. The 24c02 eeprom in your article probably could not have been read through VGA or HDMi connection the easy way with the RT809H so using an eeprom programmer was the only option here. Of course the RT809H can be used as an eprommer too but in this case the tv had to be opened first.

    Likes(4)Dislikes(0)
    • Kostas Dontsios

      November 28, 2019 at 8:44 pm

      Hello Albert.
      Can you tell me the steps how to read the firmware using the programmer connected through HDMI or VGA port?
      Thank you.

      Likes(2)Dislikes(0)
      • Albert van Bemmelen

        November 29, 2019 at 4:40 am

        That is easy Kostas. Just install the RT809H software on your computer, connect your RT809H through USB to it and connect the RT809H to any modern monitor or tv through the VGA or HDMi port on the RT809H.You can find the newest program versions for the RT809H and other programmers on : https://www.hklrf.com/Download.html
        And you can find a user manual there too! But the RT809H is not cheap costing starting at about 100 dollar/euro depending on the extra socket adapters you need. The RT809H has so many programmer tools that it is impossible to know them all! I'm still learning. Cheers!

        Likes(3)Dislikes(0)
        • Robert Calk Jr.

          November 30, 2019 at 2:22 am

          Thanks Albert. It is probably time that I upgrade to a RT809H myself!

          Likes(2)Dislikes(0)
          • Albert van Bemmelen

            November 30, 2019 at 3:38 pm

            The RT809H can even selftest (diagnose/check) itself with these affordable test boards, Robert. Not many testers can even do that! They are sold as kit you need to solder at:
            https://nl.aliexpress.com/item/32907444491.html
            They are also mentioned in the RT809H manual guide.

            Likes(0)Dislikes(0)
    • beh

      November 29, 2019 at 8:03 am

      Thanks, Albert.

      Likes(1)Dislikes(0)
      • Albert van Bemmelen

        November 29, 2019 at 5:12 pm

        Glad to help Beh! PS: In the meanwhile I've collected a lot of RT809H videos from Youtube and other interesting info I could find because mastering all options that the RT809H can do is complex. (About 2 dvd's with videos now already). And the user manual for the RT809H is not what we can call complete nor fully understandable either. Also because much is badly translated into English or still in Chinese. But above mentioned download link is the best there is. They also sell those devices.

        Likes(1)Dislikes(0)
  4. Ray

    November 28, 2019 at 6:19 pm

    You could explain how you reprogrammed the IC. Did you have to desolder it. Your article is not documented sufficiently, more details are required.

    Likes(2)Dislikes(0)
  5. Ramondo

    November 28, 2019 at 11:25 pm

    Please Sir: Where did you get master copy of eeprom? What programmer did you use? I also have same problem<< need help with Samsung Un22F5000afxza.

    Likes(0)Dislikes(0)
    • Albert van Bemmelen

      November 29, 2019 at 6:53 pm

      Hi Ramondo. I don't have the eeprom. But maybe this will help?: http://www.samsungparts.com/Products/Parts_and_Accessories/PID-1103-001563.aspx?model=UN22F5000AFXZA

      Likes(0)Dislikes(0)

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