Un50mu6070 Mainboard issue

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • petersor
    Member
    • Feb 2020
    • 43
    • United States

    #141
    Reflowed the crystals and processor . . . no change. Maybe one of the boost or buck converters? They appear to be proprietary Samsung ICs so not much else to do at this point, I think. I suppose I could try reflowing those - especially IC401 / VLS1R0A. Voltages are wrong around that one . . . maybe I have a board with that IC on it. to try swapping it out.

    Click image for larger version

Name:	Neg Boost Buck Converter.jpg
Views:	71
Size:	72.0 KB
ID:	3577095
    Attached Files

    Comment

    • petersor
      Member
      • Feb 2020
      • 43
      • United States

      #142
      lotas - any thoughts on this? Anything else to look at before I scrap it?

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4451
        • Russia

        #143
        Oh, I don’t even know, I don’t have the firmware for your panel (T-CON 25Q80) to compare. The problem may be in the eMMC, or perhaps in the processor itself...

        Comment

        • petersor
          Member
          • Feb 2020
          • 43
          • United States

          #144
          Thanks anyway. It was a good learning exercise and I appreciate all your help. Guess this one is destined for the landfill.

          Comment

          • lotas
            Badcaps Legend
            • Jan 2016
            • 4451
            • Russia

            #145

            Try reading the firmware from eeprom 24c512 and posting it.​

            Comment

            • petersor
              Member
              • Feb 2020
              • 43
              • United States

              #146
              Here's the data from the 24C512 eeprom . . . 24C512 Dump UN50MU6070 2-25-2025.zip

              Comment

              • petersor
                Member
                • Feb 2020
                • 43
                • United States

                #147
                lotas were you able to find anything in the 24C512 dump?

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4451
                  • Russia

                  #148
                  Not yet, I haven't had time yet, I'll try to look tomorrow.
                  For now, try these two dumps for 25q80 and 24c512 for diagnostics.

                  Status register for 25Q80 (0x98.0x02).
                  Attached Files
                  Last edited by lotas; 02-27-2025, 05:47 PM.

                  Comment

                  • petersor
                    Member
                    • Feb 2020
                    • 43
                    • United States

                    #149
                    Thanks. I'll give them a try when I get back home . . . travelling this weekend.

                    Comment

                    • lotas
                      Badcaps Legend
                      • Jan 2016
                      • 4451
                      • Russia

                      #150
                      Ok!

                      Comment

                      • petersor
                        Member
                        • Feb 2020
                        • 43
                        • United States

                        #151
                        Updated the firmware on the 24C512 with your file and it's still not working. I'll try the 25Q80 file at some point, but I'm going to shelf this project for now. I started restoring a Pioneer SX-1010 recently and I want to spend time on that. Thanks again for your help. I'll revisit this post when I pick this project back up.

                        Comment

                        • Alex Corps
                          Member
                          • Mar 2025
                          • 25
                          • France

                          #152
                          Hi, when I want to write the status registers I don't have the same thing at all as in your image.Click image for larger version

Name:	SREG.png
Views:	12
Size:	34.1 KB
ID:	3595995
                          Attached Files

                          Comment

                          Working...