Sony KD-55X8505 not able to start

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden

    #21
    Re: Sony KD-55X8505 not able to start

    Originally posted by Diah
    you have BL_error on the sockt. if its goes high at boot then you need to be ready for the hard work BL LED
    BL_ERROR show +2.4V at boot. The same with leds disconnected. But shouldn't it blink a led on the front ?

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6354
      • Germany

      #22
      Re: Sony KD-55X8505 not able to start

      you need to take look from down side of the boards to see the OUT1+ & OUT2+ are share same source.. OUT1 (1-4)- are separated same to OUT2(1-4)-

      and your caputre messurments of V high and low should be as following

      each time you messure OUT1+ to OUT1 line 1- then line 2- till 4 same way to OUT2+ with its group
      do in total you have 8 groups you need to messure each at boot to find one are different

      so you need 8 time messure at boot

      Attached Files
      Last edited by Diah; 06-27-2022, 10:32 AM.

      Comment

      • PowerAmpFreak
        Badcaps Veteran
        • Feb 2010
        • 977
        • Sweden

        #23
        Re: Sony KD-55X8505 not able to start

        All 8 measurements gives a value of 1.2-1.5V only. CN6801 voltage is only 63V during boot and will not change. I guess this is too low to overcome all the series leds voltage drop.
        By this I think also the BL diagnostic can't detect failure in BL since MB does not turn on the higher BL voltage...

        EDIT: Tested each of the 8 led lines with constant voltage 90V and draw 40mA each so I guess the BL is OK
        Last edited by PowerAmpFreak; 06-28-2022, 03:18 AM.

        Comment

        • William1967
          Badcaps Veteran
          • Nov 2017
          • 203
          • Netherlands

          #24
          Re: Sony KD-55X8505 not able to start

          Try the recovery mode, If after the recovery mode the device starts up and works properly, immediately make a copy of the EMMC and load it into a new EMMC. If that does not work, the EMMC must be replaced and equipped with properly working software.
          Have had dozens of these models all doing the same thing and all in need of a new EMMC, the part has reached an "END OF LIFE" status and therefore the bootloader can't start.

          Comment

          • PowerAmpFreak
            Badcaps Veteran
            • Feb 2010
            • 977
            • Sweden

            #25
            Re: Sony KD-55X8505 not able to start

            Originally posted by William1967
            Try the recovery mode, If after the recovery mode the device starts up and works properly, immediately make a copy of the EMMC and load it into a new EMMC. If that does not work, the EMMC must be replaced and equipped with properly working software.
            Have had dozens of these models all doing the same thing and all in need of a new EMMC, the part has reached an "END OF LIFE" status and therefore the bootloader can't start.
            Thanks for posting. How do I enter recovery mode?

            The set won't even be in a normal standby state, nor reacting on any keys nor remote

            Is there perhaps a jumper to short on the MB perhaps ?
            Last edited by PowerAmpFreak; 06-28-2022, 03:48 AM.

            Comment

            • Diah
              Badcaps Legend
              • Feb 2013
              • 6354
              • Germany

              #26
              Re: Sony KD-55X8505 not able to start

              unplug the wifi module socket on the IR reciever boards and trace the 3.3V

              you can follow the 3.3V on MB (Page 136 service manual)
              Attached Files
              Last edited by Diah; 06-28-2022, 09:00 AM.

              Comment

              • William1967
                Badcaps Veteran
                • Nov 2017
                • 203
                • Netherlands

                #27
                Re: Sony KD-55X8505 not able to start

                Originally posted by PowerAmpFreak
                Thanks for posting. How do I enter recovery mode?

                The set won't even be in a normal standby state, nor reacting on any keys nor remote

                Is there perhaps a jumper to short on the MB perhaps ?
                Search the internet, there is a lot of info about "Sony tv recovery mode" for example here

                Comment

                • PowerAmpFreak
                  Badcaps Veteran
                  • Feb 2010
                  • 977
                  • Sweden

                  #28
                  Re: Sony KD-55X8505 not able to start

                  Originally posted by William1967
                  Search the internet, there is a lot of info about "Sony tv recovery mode" for example here
                  Yes, but the problem in this case is that recovery mode involves a remote sequence and since the set does not even recognize keys nor remote, it will be hard...

                  Comment

                  • dskall
                    Badcaps Legend
                    • Oct 2016
                    • 2905
                    • usa

                    #29
                    Re: Sony KD-55X8505 not able to start

                    Have you watched any of Nick's TV Repair videos? He has a few on sony.
                    I assume no responsibility for any stupid suggestions I might post.

                    Comment

                    • PowerAmpFreak
                      Badcaps Veteran
                      • Feb 2010
                      • 977
                      • Sweden

                      #30
                      Re: Sony KD-55X8505 not able to start

                      I am following the fault trace chart in the Sony service manual and many of the start-up failures does lead to -> Replace IC9017 which happens to be a PIC mcu P/N PIC16F527.
                      Anyone knows if this is programmed with firmware by the main mcu during start-up if the part is changed to a new one?
                      Or do I need to find the correct flash and pre-program the device?
                      Attached Files
                      Last edited by PowerAmpFreak; 07-05-2022, 09:30 AM.

                      Comment

                      • MICROTECHSERVICE
                        Member
                        • Jun 2016
                        • 36
                        • United Kingdom

                        #31
                        Re: Sony KD-55X8505 not able to start

                        sorry for late late reply as i do lot of these main emmc is at fault replace it should fix it

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12087
                          • U.S.

                          #32
                          Re: Sony KD-55X8505 not able to start

                          @William1967 or MICROTECHSERVICE, do you get voltage on bl-error pin when emmc is the problem and can it come on with the android music but no display or backlights? or does that indicate a different problem?
                          Last edited by nomoresonys; 07-25-2022, 06:07 AM.

                          Comment

                          • William1967
                            Badcaps Veteran
                            • Nov 2017
                            • 203
                            • Netherlands

                            #33
                            Re: Sony KD-55X8505 not able to start

                            Several problems can occur when the EMMC is faulty, the most common is no function or start up with only the Sony logo.

                            Comment

                            • nomoresonys
                              Badcaps Legend
                              • Jan 2013
                              • 12087
                              • U.S.

                              #34
                              Re: Sony KD-55X8505 not able to start

                              ok, thanks.

                              Comment

                              • nomoresonys
                                Badcaps Legend
                                • Jan 2013
                                • 12087
                                • U.S.

                                #35
                                Re: Sony KD-55X8505 not able to start

                                I see now, that's one of the most heinous acts of planned obsolescence I have seen, will never buy a new sony.

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12087
                                  • U.S.

                                  #36
                                  Re: Sony KD-55X8505 not able to start

                                  my chip has density of 16GB and a storage capacity of 64GB, would it do any good as in last longer if I replaced it with 128 GB or would there be a problem?
                                  Last edited by nomoresonys; 07-25-2022, 06:42 PM.

                                  Comment

                                  • PowerAmpFreak
                                    Badcaps Veteran
                                    • Feb 2010
                                    • 977
                                    • Sweden

                                    #37
                                    Re: Sony KD-55X8505 not able to start

                                    In my case, as the OP, the set does not even try to start-up, either BL or any form of sign of life. All the voltages from PSU are OK.
                                    @Microtechservice do you have the details for this set how to replace the EMMC ?

                                    Comment

                                    • TobiasG
                                      Member
                                      • Sep 2022
                                      • 16
                                      • Deutschland

                                      #38
                                      Re: Sony KD-55X8505 not able to start

                                      Does anyone have the service manuel for the KD-55XF8505?
                                      I have the same problem but i couldnt make a new post

                                      Comment

                                      • Davi.p
                                        Hobbist Tech
                                        • Sep 2009
                                        • 4278
                                        • Italy - Milan

                                        #39
                                        Re: Sony KD-55X8505 not able to start

                                        Hi, this is clearly a case of bad main board, my guess, as poweramp says the problem appeear to be obviously the standby software and needs to be reprogrammed the pic microchip with an eprom programmer like TL866II +.. the hardest thing is to recover a copy of the dump.. maybe a fool hacking try could be made, supposing a software update by usb can be made only by inserting usb storage, then one can try to force supply lines from psb (Power amp already has 3v+12v) and force a reset signal on an external supposed reset chip or reset pins by pic chip, short it to gnd for a sec then hope main software starts..

                                        Comment

                                        Related Topics

                                        Collapse

                                        • mmartell
                                          Sony KDL-65W850C is this a Mainboard issue ??
                                          by mmartell
                                          This sat around for quite some time after the backlights died with the six blink error code. I bought replacement strips and eventually swapped them in.

                                          Backlights appear to be working fine now. However the tv only powers on with the "Sony" logo for about two seconds after which it goes away and the panel with backlights stay powered for about twenty more seconds then it shuts off. Tv can only be powered again after power cycling at the outlet.

                                          It will not program via usb, the stick flashes but there is never any indication that it has entered programming...
                                          11-19-2023, 10:27 AM
                                        • TerraPhantm
                                          Sony A8H to A80J mainboard upgrade possible?
                                          by TerraPhantm
                                          I have a Sony 65A8H. Always bothered me that it doesn't have HDMI 2.1. I noticed the A80J board appears quite similar. And comparing some wiring diagrams in the service manuals (albeit A9G vs A90J since I couldn't find the A8/80 manuals), things appeared quite similar. And my understanding is the panels between the two TVs are more or less the same.

                                          So I decided I'd experiment a little bit.

                                          I bought an A80J board. Left the speaker connection unplugged because it doesn't fit. Changed the power connector to fit the new board. Plugged in everything else.

                                          When...
                                          08-15-2023, 08:10 AM
                                        • noinimod
                                          Sony 55X900E no standby light, no power. Replaced mainboard already
                                          by noinimod
                                          No standby red light, nothing
                                          This Sony has a separate AC->DC power adapter supplying 19.5V to the TV power board (JK3)



                                          Disconnected JK3 power board from main board, checked voltages on all the pin outs

                                          At a few pins I can see the power supply providing 19.5V to the main board



                                          Based on the service manual triage.. it seems to be pointing towards the power board (JK3) being the most possible culprit


                                          LED light turns on when I disconnect LED driver board ribbon from mainboard (so i thought it is the mainboard,...
                                          12-22-2021, 12:58 AM
                                        • Carlos#2003%
                                          Schematic de una Sony VAIO PCG-41217u, Sony VPCSB45FL (MBX-237), 1p-0117j01-a012 mbx-237.
                                          by Carlos#2003%
                                          Buenas mi nombre es carlos me uni al foro porque estoy buscando el schematic de una sony vaio pcg-41217u otras formas de escribirlo son 1p-0117j01-a012 mbx-237 numero de placa revision 1.2 o Sony VPCSB (MBX-237), en fin me gustaria y ayudaria un monton si alguien me puede dar dichi svhematic para hacer las mediciones de una laptop de la mencionada anteriormente(Sony VAIO PCG-41217U) con el fin de repararla dejo de funcionar solo prende el led de la bateria al pulsar el boton de power el disco empiesa a hacer ruido de actividad pero los leds del frontas no reflejan acividad y no enciende la pantalla....
                                          02-15-2024, 07:52 PM
                                        • dkneyle
                                          Sony KDL-46HX850 Can't upgrade/update firmware
                                          by dkneyle
                                          Diagnosed this TV as having a failed main board which I've replaced with one from a KDL 55HX850. They are (supposedly) the same board.

                                          Being 'Smart TV' it requires a firmware reboot when you swap out boards such as T-Con or main board. It starts with a black screen and flashing yellow and green LEDS, indicating it needs that firmware boot. The procedure described all over the web is to put the software into the root directory of a FAT32 formatted USB drive and it should load that up once plugged into USB1 port. But not for me. I can see the LED on the USB chip flash for about...
                                          09-25-2024, 10:44 PM
                                        • Loading...
                                        • No more items.
                                        Working...