Hisense 55'' Issues Mainboard or Power Supply?

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  • dabushar
    Member
    • Aug 2019
    • 23
    • Kenya

    #1

    Hisense 55'' Issues Mainboard or Power Supply?

    Hi Guys, i have a tv i bought a mainboard for (a hisense 55H8E) because it just stopped working. When i replaced with the new motherboard. The TV comes on displays the logo and starts up fine.

    When i load or connect an input or play a youtbe video the backlight disappears but the audio and video remain. Anyone Experienced such? I have attached some pics of the old board the new board the power supply and the model.

    If anyone can assist id be grateful.
    Attached Files
  • neilc6
    Badcaps Legend
    • Nov 2015
    • 1550
    • Canada

    #2
    Re: Hisense 55'' Issues Mainboard or Power Supply?

    Any issue with the backlight is usually the LEDs failing or intermittent. You can try turning down the backlight level and see if they stay on longer. Running at 100% is what causes them to fail.

    Comment

    • Davi.p
      Hobbist Tech
      • Sep 2009
      • 4282
      • Italy - Milan

      #3
      Re: Hisense 55'' Issues Mainboard or Power Supply?

      In the options menu try to disable something like "dynamic dimming" or similar, then retry with your videos... but still a leds problem remain..

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6355
        • Germany

        #4
        Re: Hisense 55'' Issues Mainboard or Power Supply?

        Originally posted by dabushar
        Hi Guys, i have a tv i bought a mainboard for (a hisense 55H8E) because it just stopped working. When i replaced with the new motherboard. The TV comes on displays the logo and starts up fine.

        When i load or connect an input or play a youtbe video the backlight disappears but the audio and video remain. Anyone Experienced such? I have attached some pics of the old board the new board the power supply and the model.

        If anyone can assist id be grateful.
        this had nothings to do with backlight issue.... hisense had option only audio.. to cut off BL. and widwine key for youtube content.. so..
        yours replacement boards belong to different model.. size.. need to write firmware again by downgrade and then upgrade to register yours screen and T-CON. or try first with service menu option ( Clear Flash )

        its so easy from the photo you can see the replacement boards had double ram.

        Comment

        • dabushar
          Member
          • Aug 2019
          • 23
          • Kenya

          #5
          Re: Hisense 55'' Issues Mainboard or Power Supply 55H8E?

          Originally posted by Diah
          this had nothings to do with backlight issue.... hisense had option only audio.. to cut off BL. and widwine key for youtube content.. so..
          yours replacement boards belong to different model.. size.. need to write firmware again by downgrade and then upgrade to register yours screen and T-CON. or try first with service menu option ( Clear Flash )

          its so easy from the photo you can see the replacement boards had double ram.
          Thanks @Diah, The replacement board is the exact same but a diffrent region, the board is from the US. The Original is from Africa/MiddleEast. SO i think therein lies the problem. I think the replacement board is draawing to much current from the power supply and since the inverter cant handle it, it drains the mosfets below thus shutting off the backlight.

          I was looking at the power supply for the US Hisense and its different. I think thats why its not working as it should. I have attached it.

          My Question now is: Can i lift the IC's from the new board and change the ones i have circled on the new board. My guess is the TCON is the one that died and since its on the mainboard the whole board will not work.

          If i transplant the IC's, Would the old board work? Or is the something else that should be replaced too?

          Thank you
          Attached Files
          Last edited by dabushar; 10-02-2020, 03:48 PM. Reason: Add a photo

          Comment

          • Davi.p
            Hobbist Tech
            • Sep 2009
            • 4282
            • Italy - Milan

            #6
            Re: Hisense 55'' Issues Mainboard or Power Supply?

            The top one is an audio.amplifier, the other ones can't be focused well with so an unclear photograph. the theory of the different drawn of power supply in mainboards is not realistic for me, the boards differences are very little in electrical level, i think and i'm convinced, you have a bad led intermittent. It is not easy.to diagnose this way but the only way like i did is to let the tv run at the lowest level backlight and wait when it no more light up, then.test every led.
            Last edited by Davi.p; 10-02-2020, 05:16 PM.

            Comment

            • dabushar
              Member
              • Aug 2019
              • 23
              • Kenya

              #7
              Re: Hisense 55'' Issues Mainboard or Power Supply?

              Originally posted by Davi.p
              The top one is an audio.amplifier, the other ones can't be focused well with so an unclear photograph. the theory of the different drawn of power supply in mainboards is not realistic for me, the boards differences are very little in electrical level, i think and i'm convinced, you have a bad led intermittent. It is not easy.to diagnose this way but the only way like i did is to let the tv run at the lowest level backlight and wait when it no more light up, then.test every led.
              With the Replacement Board the TV starts very well, Backlight only disappears when you try any load (hdmi,aerial,youtube) When you restart the TV It starts up fine. Sorry about the bad photos. What i know about the leds is one is bad they all dont light up.

              Comment

              • Davi.p
                Hobbist Tech
                • Sep 2009
                • 4282
                • Italy - Milan

                #8
                Re: Hisense 55'' Issues Mainboard or Power Supply?

                If the video input requests more light since it's a dynamic dimming maybe, then an half shorted led goes short circ. Check for the PSU connector signals to force the bl-on whitout a mainboard.
                Last edited by Davi.p; 10-02-2020, 07:38 PM.

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6355
                  • Germany

                  #9
                  Re: Hisense 55'' Issues Mainboard or Power Supply 55H8E?

                  Originally posted by dabushar
                  Thanks @Diah, The replacement board is the exact same but a ......If i transplant the IC's, Would the old board work? Or is the something else that should be replaced too?

                  Thank you
                  Short answer NO. !!! are you going to develop Main boards !!
                  you have now just issue with soc I2C address which its designed & a signed by firmware.. so..

                  1-before we lost in BL subject.. you need to tell me whats wrong / Fault you have with yours original main boards..
                  2- with out any source ..log in your service menu and upload photo on pages:
                  A-Design - MAINCHIP SSC
                  B-Design- DRC & PAGAIN

                  3- check on Factory page all Key written and marked with OK
                  Last edited by Diah; 10-03-2020, 01:10 AM.

                  Comment

                  • Diah
                    Badcaps Legend
                    • Feb 2013
                    • 6355
                    • Germany

                    #10
                    Re: Hisense 55'' Issues Mainboard or Power Supply 55H8E?

                    Originally posted by dabushar
                    Thanks @Diah, The replacement board is the exact same but a diffrent region,
                    Thank you
                    NO. different NAND / RAM = different soc I2C at firmware.
                    Attached Files

                    Comment

                    • dabushar
                      Member
                      • Aug 2019
                      • 23
                      • Kenya

                      #11
                      Re: Hisense 55'' Issues Mainboard or Power Supply 55H8E?

                      Originally posted by Diah
                      Short answer NO. !!! are you going to develop Main boards !!
                      you have now just issue with soc I2C address which its designed & a signed by firmware.. so..

                      1-before we lost in BL subject.. you need to tell me whats wrong / Fault you have with yours original main boards..
                      2- with out any source ..log in your service menu and upload photo on pages:
                      A-Design - MAINCHIP SSC
                      B-Design- DRC & PAGAIN

                      3- check on Factory page all Key written and marked with OK
                      I removed the heatsinks and took a better photo. I have shared the photo below..

                      Original - https://ibb.co/C6YdvVk
                      Replacement - https://ibb.co/NSFJJCX

                      Comment

                      • Davi.p
                        Hobbist Tech
                        • Sep 2009
                        • 4282
                        • Italy - Milan

                        #12
                        Re: Hisense 55'' Issues Mainboard or Power Supply?

                        No different nand / ram... only cpu heatsink mounted in different way that covers chips.

                        Comment

                        • dabushar
                          Member
                          • Aug 2019
                          • 23
                          • Kenya

                          #13
                          Re: Hisense 55'' Issues Mainboard or Power Supply?

                          Originally posted by Davi.p
                          No different nand / ram... only cpu heatsink mounted in different way that covers chips.
                          What if i give the backlight a signal and another direct inverter so that when switched on the backlight comes on irregardless of the source on the power supply.?

                          Comment

                          • Davi.p
                            Hobbist Tech
                            • Sep 2009
                            • 4282
                            • Italy - Milan

                            #14
                            Re: Hisense 55'' Issues Mainboard or Power Supply?

                            I don't undrrstand, do what i have suggested earlier.. if you are not familiar post the silkscreened table of the pins on the power supply..

                            Comment

                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6355
                              • Germany

                              #15
                              Re: Hisense 55'' Issues Mainboard or Power Supply 55H8E?

                              Originally posted by dabushar
                              I removed the heatsinks and took a better photo. I have shared the photo below..
                              Originally posted by Davi.p
                              No different nand / ram... only cpu heatsink mounted in different way that covers chips.
                              original set A6100 series replacement boards come from H8000 series.. hisense not so dumm to sell TV witj just heatsink flip up.... we are not judging by looking on beautiful woman with same eyes and lips... but the hearts (FW) are different. this why i asked to see her hearts value. LOL

                              Comment

                              • nomoresonys
                                Badcaps Legend
                                • Jan 2013
                                • 12093
                                • U.S.

                                #16
                                Re: Hisense 55'' Issues Mainboard or Power Supply?

                                Save yourself from pulling all your hair out and just get the correct mainboard.

                                Comment

                                • dabushar
                                  Member
                                  • Aug 2019
                                  • 23
                                  • Kenya

                                  #17
                                  Re: Hisense 55'' Issues Mainboard or Power Supply?

                                  Yes, I think i will just have to get the correct mainboard for the A6103.. I saw the power supply for the american version and it's totally different. So the structuring of the backlights is very different, so my power supply wouldn't suffice. Even if I add an external inverter, it still would have some issues, Thanks for the help. You guy's are awesome..
                                  Last edited by dabushar; 10-05-2020, 01:18 AM.

                                  Comment

                                  • Davi.p
                                    Hobbist Tech
                                    • Sep 2009
                                    • 4282
                                    • Italy - Milan

                                    #18
                                    Re: Hisense 55'' Issues Mainboard or Power Supply?

                                    When you will spend extra money for a new board and you will see that is not enough? And with a test of few minutes you have the answer maybe.. testing the BL can be a very easy task.. i don't understand you.

                                    Comment

                                    • dabushar
                                      Member
                                      • Aug 2019
                                      • 23
                                      • Kenya

                                      #19
                                      Re: Hisense 55'' Issues Mainboard or Power Supply?

                                      Originally posted by Davi.p
                                      When you will spend extra money for a new board and you will see that is not enough? And with a test of few minutes you have the answer maybe.. testing the BL can be a very easy task.. i don't understand you.
                                      I already tested the backlight, i tested the board off the TV with other BL strips. Its shuts down.. I took photos of the TV working and loading content below
                                      https://ibb.co/KzqLTrm
                                      https://ibb.co/56Z3NtF
                                      https://ibb.co/S72Zqw2
                                      https://ibb.co/mR1fjmk
                                      https://ibb.co/LtJrN8C
                                      https://ibb.co/pJj1tHB

                                      So problem is the different mainboard... Below is its power supply..
                                      https://www.ebay.com/itm/Hisense-Pow...-/223495628051

                                      as you can see the power supply has an extra board on top for connection to backlight board.. Only found this recently

                                      Comment

                                      • Davi.p
                                        Hobbist Tech
                                        • Sep 2009
                                        • 4282
                                        • Italy - Milan

                                        #20
                                        Re: Hisense 55'' Issues Mainboard or Power Supply?

                                        ok this is a good test, so with external strips its shuts off after how much time or in which condition?

                                        Comment

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