Samsung LE32B350F1W starting PROBLEM

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  • saddle_au
    Waste Warrior
    • Jan 2013
    • 121
    • Australia

    #21
    Re: Samsung LE32B350F1W starting PROBLEM

    Just adding 2cents worth here.

    I would also suspect this regulator because the 5 volt generation comes off the same transformer and the feedback off this goes back through PCM801S opto. The circuit shows either feedback from the 5v or from the unregulated 12v through the opto.

    If there was any other instability in the whole circuit, the 5volt line would also bounce around. Also measure the voltage on the feed side of the regulator, is it stable?

    Check the feedback resistor divider values and connections. RM864 (10k), RM863 (1k) and RM865 (100R). There should be a stable 1.3volts between the junction of RM863/RM864 and ground pin 3 of the regulator.
    Output = 1.3*(10k + 1k + 100R)/(1k +100R) = 13.1v

    The output capacitor also needs to be present to ensure stability. CM856 (470uf) and CM857 (470uf), check ground connections (look for solder cracks) and cap values.

    Lastly, check ground connection of regulator pin 3.

    ==========

    You can also put in a cheap LM7812 regulator with two diodes from the tab to ground (isolate the tab from ground) to try it, or use a LM317 (isolate the tab from ground) with two different resistor values to set the 13.1v.

    Comment

    • mr.cool
      Member
      • Dec 2013
      • 22
      • Austria

      #22
      Re: Samsung LE32B350F1W starting PROBLEM

      ....sorry but the tab is connected to pin 2 of the LM7812 ?!

      Comment

      • mr.cool
        Member
        • Dec 2013
        • 22
        • Austria

        #23
        Re: Samsung LE32B350F1W starting PROBLEM

        I tested it with the mc7812.....
        And it starts normally !
        All voltages are stable !

        Now iยดm still waiting for the KIA......

        Comment

        • mr.cool
          Member
          • Dec 2013
          • 22
          • Austria

          #24
          Re: Samsung LE32B350F1W starting PROBLEM

          So my dear friends !
          Waiting has ended now !
          And the TV is working fine again with the new KIA....

          Fu***** LDO

          I say THANK YOU to ALL who helped me !
          Great Thanks to BUDM and SADDLE_AU !!

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #25
            Re: Samsung LE32B350F1W starting PROBLEM

            Thanks for the follow-up, glad that it was just the bad regulator, not the EEPROM or the main board.
            Last edited by budm; 07-13-2015, 02:04 PM.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • polykarp
              New Member
              • Jul 2012
              • 1
              • slovakia

              #26
              Re: Samsung LE32B350F1W starting PROBLEM

              Originally posted by victor_cj
              BN44-00289A with soldering problem or main board with 24C512 eeprom problem.
              Hi, all there.
              I just want share my experience whit this TV.
              In my case was two problems.

              The first one was that i have no back-light , that was solved by replacing the defective HV transformer for CCFL. I tested the power board an back-light so that i disconnected it from logic(main)board, and back-light was working just fine.

              The second was with eeprom 24c512. When i connected power board to main board, tv turns on with that fancy SAMSUNG sound, and after 3-5 second back-light goes off, but tv stays on.
              After desoldering the eeprom i not changed it for new one, but erased it with programmer and put it back to main board.
              The next start of tv was just fine an tv works again.

              Comment

              • WhiteWolfHellas
                Senior Member
                • Jun 2019
                • 95
                • Greece

                #27
                Re: Samsung LE32B350F1W starting PROBLEM

                Originally posted by polykarp
                Hi, all there.
                I just want share my experience whit this TV.
                In my case was two problems.

                The first one was that i have no back-light , that was solved by replacing the defective HV transformer for CCFL. I tested the power board an back-light so that i disconnected it from logic(main)board, and back-light was working just fine.

                The second was with eeprom 24c512. When i connected power board to main board, tv turns on with that fancy SAMSUNG sound, and after 3-5 second back-light goes off, but tv stays on.
                After desoldering the eeprom i not changed it for new one, but erased it with programmer and put it back to main board.
                The next start of tv was just fine an tv works again.
                I also have the same issue. I replaced the HV transformer to repair the no backlight problem, but after 7 months the TV now has a bootloop problem. I don't see a 24C512 eprom though.

                Comment

                • vinceroger69
                  Badcaps Legend
                  • Mar 2012
                  • 6714
                  • uk

                  #28
                  Re: Samsung LE32B350F1W starting PROBLEM

                  Originally posted by WhiteWolfHellas
                  I also have the same issue. I replaced the HV transformer to repair the no backlight problem, but after 7 months the TV now has a bootloop problem. I don't see a 24C512 eprom though.
                  post 11 has a good picture of the eeprom location

                  Comment

                  • WhiteWolfHellas
                    Senior Member
                    • Jun 2019
                    • 95
                    • Greece

                    #29
                    Re: Samsung LE32B350F1W starting PROBLEM

                    Originally posted by vinceroger69
                    post 11 has a good picture of the eeprom location
                    In my board this chip is labeled ATMLH922 2GB 1.
                    I put it in my RT809H and it is only identified as 24_04. I cannot read it.

                    Comment

                    • vinceroger69
                      Badcaps Legend
                      • Mar 2012
                      • 6714
                      • uk

                      #30
                      Re: Samsung LE32B350F1W starting PROBLEM

                      Originally posted by WhiteWolfHellas
                      In my board this chip is labeled ATMLH922 2GB 1.
                      I put it in my RT809H and it is only identified as 24_04. I cannot read it.
                      what is the mainboard number used in your set in post 11 now im on my laptop i can see that their are 4 different 8 legged ics fitted too the pcb

                      Comment

                      • WhiteWolfHellas
                        Senior Member
                        • Jun 2019
                        • 95
                        • Greece

                        #31
                        Re: Samsung LE32B350F1W starting PROBLEM

                        Ok, I just repaired the TV. The bootloop problem was cold joints on the PSU.

                        Comment

                        • vinceroger69
                          Badcaps Legend
                          • Mar 2012
                          • 6714
                          • uk

                          #32
                          Re: Samsung LE32B350F1W starting PROBLEM

                          Originally posted by WhiteWolfHellas
                          Ok, I just repaired the TV. The bootloop problem was cold joints on the PSU.
                          Thanks for the update and glad the tv is working again.

                          Comment

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