Announcement

Collapse
No announcement yet.

Sanyo DP55441 - No brightness control

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Sanyo DP55441 - No brightness control

    Recently picked up a Sanyo DP55441. Set has a few issues:
    1. When I turn it on, I always have to select either "Store" or "Home" on the menu (see attachment).
    2. It forgets which input I was using last, so I have to change the input setting everytime.
    3. The controls for Brightness, Contrast, Saturation, Hue and Sharpness are not available from the menu (see attachment).

    Besides these issues the set works good, no other issues that I know of.

    I am thinking all three are related and its probably the main board. I have looked at the main board and the power board, but see no visible damage.

    Any ideas?

    Thanks
    Attached Files

    #2
    Re: Sanyo DP55441 - No brightness control

    This is usually due to bad memory (Eeprom, Spi Flash).

    Comment


      #3
      Re: Sanyo DP55441 - No brightness control

      How do I fix it?

      Comment


        #4
        Re: Sanyo DP55441 - No brightness control

        Originally posted by karthur View Post
        How do I fix it?
        If you have a programmer, then you need to unsolder this spi flash (from the photo of your motherboard, I no longer saw other Eeprom and spi flash). Read the contents in your memory and save the dump. Buy a new flash and load your saved dump into it and solder it in place of the old flash.
        Attached Files

        Comment


          #5
          Re: Sanyo DP55441 - No brightness control

          https://www.shopjimmy.com/sanyo-431c...8aAkWZEALw_wcB
          I assume no responsibility for any stupid suggestions I might post.

          Comment


            #6
            Re: Sanyo DP55441 - No brightness control

            probably bad memory as mentioned, did you try an update and or factory reset?

            Comment


              #7
              Re: Sanyo DP55441 - No brightness control

              Originally posted by nomoresonys View Post
              probably bad memory as mentioned, did you try an update and or factory reset?
              I did do a reset from the onscreen menu, but I have not tried an update. Is there a certain key sequence to get into a service mode or some other way to get into a deeper reset?

              I searched on Sanyo-av.com for my model No. There is no update listed there.
              Last edited by karthur; 06-19-2022, 10:46 AM.

              Comment


                #8
                Re: Sanyo DP55441 - No brightness control

                Originally posted by lotas View Post
                If you have a programmer, then you need to unsolder this spi flash (from the photo of your motherboard, I no longer saw other Eeprom and spi flash). Read the contents in your memory and save the dump. Buy a new flash and load your saved dump into it and solder it in place of the old flash.
                Here is a picture of my board. There are several of those on the board.

                I don't have a programmer. Would one of these work?

                Thanks
                Attached Files

                Comment


                  #9
                  Re: Sanyo DP55441 - No brightness control

                  If you see microcircuits on the board 24Cxx, then this is Eeprom, if there are 25Xxx, then this is Spi flash, but the markings are not visible in the photo, rather these are DC / DC converters in the Sop-8 package. As for the programmer - yes it will do.

                  Comment


                    #10
                    Re: Sanyo DP55441 - No brightness control

                    Originally posted by lotas View Post
                    If you see microcircuits on the board 24Cxx, then this is Eeprom, if there are 25Xxx, then this is Spi flash, but the markings are not visible in the photo, rather these are DC / DC converters in the Sop-8 package. As for the programmer - yes it will do.
                    Let me get the back off again and I will take a closer look.

                    Comment


                      #11
                      Re: Sanyo DP55441 - No brightness control

                      Originally posted by karthur View Post
                      Let me get the back off again and I will take a closer look.
                      You can also look at the back of the board.

                      Comment


                        #12
                        Re: Sanyo DP55441 - No brightness control

                        Usually, the eeprom or spi flash is marked with a dot or a strip of paint (indicating that the microcircuit has been programmed and tested).
                        Attached Files

                        Comment


                          #13
                          Re: Sanyo DP55441 - No brightness control

                          Originally posted by lotas View Post
                          Usually, the eeprom or spi flash is marked with a dot or a strip of paint (indicating that the microcircuit has been programmed and tested).
                          The only one I found with "25" on it (see attachment) and it has the paint mark. I did not see any with "24" on them. Do I need to look on back of board for one with "24" on it?
                          Attached Files

                          Comment


                            #14
                            Re: Sanyo DP55441 - No brightness control

                            Went ahead and flipped the board over. Found this one with a paint mark on it too, Number on it reads 25L8xxxx if it matters. I think the xxxx is 036F, but its covered by the paint.
                            Attached Files

                            Comment


                              #15
                              Re: Sanyo DP55441 - No brightness control

                              Maybe, maybe not. But rather it is not there.

                              Comment


                                #16
                                Re: Sanyo DP55441 - No brightness control

                                On the other hand, we do not need 25xxx, it is rather responsible for scarlet (matrix settings).

                                Comment


                                  #17
                                  Re: Sanyo DP55441 - No brightness control

                                  Originally posted by lotas View Post
                                  On the other hand, we do not need 25xxx, it is rather responsible for scarlet (matrix settings).
                                  Both of them are 25xxx. Is the one on the front the one that possibly needs to be replaced? Are there certain specifications that I need to look for to replace it with? Surely there are other sources for this that are not $16.

                                  Thanks

                                  Comment


                                    #18
                                    Re: Sanyo DP55441 - No brightness control

                                    Wipe off the paint so that the full marking can be seen.

                                    Comment


                                      #19
                                      Re: Sanyo DP55441 - No brightness control

                                      Originally posted by lotas View Post
                                      Wipe off the paint so that the full marking can be seen.
                                      Here is close-ups of both chips. The numbers are:

                                      Front Chip
                                      MXIC MX
                                      25L3206E
                                      M2I-12G
                                      3F652000
                                      L111676

                                      Back Chip:
                                      MXIC MX
                                      25L8006E
                                      M2I-12G
                                      3E660500
                                      Z105075
                                      Attached Files
                                      Last edited by karthur; 06-19-2022, 12:48 PM.

                                      Comment


                                        #20
                                        Re: Sanyo DP55441 - No brightness control

                                        For 16 bucks there is an already programmed flash, you need to find the same or an analogue (the size of the internal memory), they cost a penny.

                                        https://aliexpress.ru/popular/mx25l3206em2i-12g.html

                                        Comment

                                        Working...
                                        X