Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

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  • beetle1303
    Badcaps Veteran
    • Jul 2019
    • 279
    • Singapore

    #101
    Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

    With jumper wires on:
    PD-15 (BU5V) ----- 14 PS_ON ( turn on UR13.2V )
    PD-15 (BU5V) ----- 16 PNL_POW (turn on PNL12V )
    PD-15 (BU5V) ----- 24 (STB) ( turn on BL_ on ) IC7700
    PD-15 (BU5V) ----- 21 OFL
    *PD-15 (BU5V) ----- 19 Dimmer (983ohm resistor)


    PD Connector:
    PD-1 (PNL12V) : 11.92V
    PD-2 (PNL12V) : 11.92V
    PD-3 (SGRN) : 0V
    PD-4 (SGRN) : 0V
    PD-5 (UR13.2V) : 13.05V
    PD-6 (UR13.2V) : 13.05V
    PD-7 (UR13.2V) : 13.05V
    PD-8 (UR13.2V) : 13.05V
    PD-9 (SGRN) : 0V
    PD-10 (SGRN) : 0V
    PD-11 (SGRN) : 0V
    PD-12 (SGRN) : 0V
    PD-13 (AC_DET) : 3.27V
    PD-14 (PS_ON) : 4.95V
    PD-15 (BU5V) : 4.95V
    PD-16 (PNL_POW) : 4.58V
    PD-17 (NC) : 0.04V
    PD-18 (NC) : 0.04V
    **PD-19 (DIMMER) : 4.55V**
    PD-20 (NC) : 0.04V
    *PD-21 (OFL) : 1.74V*
    PD-22 (ERROR) : 0V
    PD-23 (NC) : 0.04V
    PD-24 (SBY) : 4.3V

    Added PD-15 to PD-19 with 983ohm resistor and read 4.55V, and value of PD21 changed from 0V to 1.74V.
    Still the same - screen flashes for a split second then off.
    Last edited by beetle1303; 04-23-2022, 07:25 AM.

    Comment

    • lotas
      Badcaps Legend
      • Jan 2016
      • 4463
      • Russia

      #102
      Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

      These SHAPRs have bad contacts (connectors) on the LED strips (you need to solder them)

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6343
        • Germany

        #103
        Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

        at this moment i wouldn't care of this since PD-22 (ERROR) =0 V mean no error.
        MB signal are not only V. its pules freq. we can see there are several pins need signal..

        i never read some one successfully to run the BL on at this PCB all are one click.. one things more this BL had nothings to do with main fault.. because MB just one signal send PS_ON no other signal as the cpu communication failed.

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12084
          • U.S.

          #104
          Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

          the mystery deepens, lol.

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6343
            • Germany

            #105
            Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

            Originally posted by nomoresonys
            the mystery deepens, lol.
            good points... OP need to dive deep to see whats going on this second blink..

            Comment

            • beetle1303
              Badcaps Veteran
              • Jul 2019
              • 279
              • Singapore

              #106
              Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

              Originally posted by lotas
              These SHAPRs have bad contacts (connectors) on the LED strips (you need to solder them)
              So I re-soldered all the pins of L1 and L2 connectors.

              Some of the pins has got tiny bubbles when heated up, not sure if those are signs of bad contact?

              But now it doesn't flash at all... Value of OFL changed from 1.74V to 0.8V, all others remain the same.

              Comment

              • Diah
                Badcaps Legend
                • Feb 2013
                • 6343
                • Germany

                #107
                Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                check again yours soldering work that no short between pins...
                remove the dimmer jumper they will flash again
                wait for yours MB.

                Comment

                • beetle1303
                  Badcaps Veteran
                  • Jul 2019
                  • 279
                  • Singapore

                  #108
                  Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                  Originally posted by Diah
                  check again yours soldering work that no short between pins...
                  remove the dimmer jumper they will flash again
                  wait for yours MB.
                  Cleaned up my shoddy act on L1 & L2, and Tada - BL ON!! Such a beautiful sights!!!

                  Thank you every one - your guys are magicians to me

                  And yes sir - waiting for my MB.
                  Attached Files

                  Comment

                  • Diah
                    Badcaps Legend
                    • Feb 2013
                    • 6343
                    • Germany

                    #109
                    Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                    Originally posted by beetle1303
                    Cleaned up my shoddy act on L1 & L2, and Tada - BL ON!! Such a beautiful sights!!!

                    Thank you every one - your guys are magicians to me

                    And yes sir - waiting for my MB.
                    so you can sleep today on the screen light LOL

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12084
                      • U.S.

                      #110
                      Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                      VERY nice, mystery solved.

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12084
                        • U.S.

                        #111
                        Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                        I was pretty sure I saw this model with forced on backilghts on some forum somewhere.

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12084
                          • U.S.

                          #112
                          Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                          well I should have mentioned checking the solder joints, I guess I preach it so much I just assumed I already did, I must be slipping.
                          Last edited by nomoresonys; 04-23-2022, 10:48 AM.

                          Comment

                          • nomoresonys
                            Badcaps Legend
                            • Jan 2013
                            • 12084
                            • U.S.

                            #113
                            Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                            Originally posted by Diah
                            at this moment i wouldn't care of this since PD-22 (ERROR) =0 V mean no error.
                            MB signal are not only V. its pules freq. we can see there are several pins need signal..

                            i never read some one successfully to run the BL on at this PCB all are one click.. one things more this BL had nothings to do with main fault.. because MB just one signal send PS_ON no other signal as the cpu communication failed.
                            This was a very good clue too, the first part that is. lol.

                            Comment

                            • nomoresonys
                              Badcaps Legend
                              • Jan 2013
                              • 12084
                              • U.S.

                              #114
                              Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                              Knew there was something wrong on powerboard side, NEVER saw on you couldn't turn on.

                              Comment

                              • beetle1303
                                Badcaps Veteran
                                • Jul 2019
                                • 279
                                • Singapore

                                #115
                                Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                                After a good night sleep rejoicing the romantic backlight, we thought of summarizing which PD pins must be jumped in turn on the BL. So a created a matrix, and start testing each combination.
                                To my horror - none of the combinations work and no more BL!!!

                                After several trial and errors - all jump wires are with 850ohm resistor, and only one with 983ohm, and it turns out, PD-21 OFL on only work with this 983ohm resistor, not the 850ohm ones!

                                Also, PD-19 Dimmer is not necessary for this work on also.
                                Attached Files

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12084
                                  • U.S.

                                  #116
                                  Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                                  ok, interesting, was wondering what combo was needed.

                                  Comment

                                  • beetle1303
                                    Badcaps Veteran
                                    • Jul 2019
                                    • 279
                                    • Singapore

                                    #117
                                    Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                                    While waiting for MB, I was googling for a Sharp TV boot sequence/hand-shaking, but did not find a complete documentation.
                                    This is what I guessed based on the conversions:
                                    1) Powered up - PD15 BU5V gets 4.96V to MB
                                    2) MB send PD24 STB 4.7V, turns on red standby indicator light
                                    3) Pressed power button, MB sends PD14 PS_ON 4.95V to PSU
                                    4) PSU turns on PD5-8 UR13. 2V 13.05V, and sends PD13 AC_DET 3. 27V to MB
                                    5) MB sends PD16 PNL_POW 4.58V to PSU
                                    6) PSU turns on PD1-2 PNL12V 11. 92V
                                    7) MB sends PD19 Dimmer 0.14V and PD21 OFL 4.16V
                                    8) PSU turns on BL!

                                    Besides obviously more and various checks and sensing for and between each step, is this close enough, or far from being correct?

                                    Comment

                                    • Diah
                                      Badcaps Legend
                                      • Feb 2013
                                      • 6343
                                      • Germany

                                      #118
                                      Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                                      poists 2, not exactly, becuase the LED indicator connected to MB not PCB, and the first points when PCB send BU5V this will be used to LED indicatore and to start the SPI Flash.

                                      i thinl STB they mean start BL circuit. because other to tuen on 13 and panel 12 are clear.

                                      any way. its good if you rework the socket on MB take it out clean the solder and resolder it again correct... who knows could we have different sign. since LED BL worked after rework soldering then do it on the MB socket too.

                                      Comment

                                      • beetle1303
                                        Badcaps Veteran
                                        • Jul 2019
                                        • 279
                                        • Singapore

                                        #119
                                        Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                                        Originally posted by Diah
                                        poists 2, not exactly, becuase the LED indicator connected to MB not PCB, and the first points when PCB send BU5V this will be used to LED indicatore and to start the SPI Flash.

                                        i thinl STB they mean start BL circuit. because other to tuen on 13 and panel 12 are clear.

                                        any way. its good if you rework the socket on MB take it out clean the solder and resolder it again correct... who knows could we have different sign. since LED BL worked after rework soldering then do it on the MB socket too.
                                        So not surprisingly, after re-soldering the PB connector on the MB side - no indicator lights, power backlights, nothing..

                                        Anyone has any document or reference to Sharp booting sequence/hand-shaking protocols? I personal feel this would be a very help guide on focusing problem solving on Power Board first or Mainboard first.

                                        Comment

                                        • nomoresonys
                                          Badcaps Legend
                                          • Jan 2013
                                          • 12084
                                          • U.S.

                                          #120
                                          Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

                                          well it was working, then you messed with the mainboard connector, I think you tried to over-fix it, not good, maybe same as before re-check your work.
                                          Last edited by nomoresonys; 04-26-2022, 07:50 AM.

                                          Comment

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