Toshiba 23l1350u standby voltage present, won't power up

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  • AcGeorgiegirl
    Badcaps Veteran
    • Jun 2013
    • 202
    • USA

    #1

    Toshiba 23l1350u standby voltage present, won't power up

    There's no standby led lighting up. Without the main board connected, I get 5.14 on the 3 pins labeled for 5v for what I assume is standby(con isn't labeled as such...see pics). With main board connected, I get the following pin voltages:

    1 gnd
    2 5vcc 5.21
    3 5vcc 5.21
    4 gnd
    5 5vcc 5.21
    6 13vcc 12.71
    7 13vcc_AUD 12.71
    8 gnd
    9 PWON 3.03
    10 ACD 3.46
    11 gnd
    12 BLON 0
    13 DIM 0

    I realize that pins 6 & 7 are supposed to be 13v. I don't know what pins 9 & 10 should be, nor 12 & 13. Also, when checking diodes and fuses, I found that D210A on the Secondary side has reading both ways (208 and 1342) I keep running into this, and am wondering if this is normal on the secondary side, or not? I usually don't take the diodes out of circuit when I test them...maybe this is why I get this?
    Attached Files
    Last edited by AcGeorgiegirl; 01-06-2017, 05:35 PM.
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: Toshiba 23l1350u standby voltage present, won't power up

    I would say that the backlight on is missing (around 3V) and also Dim voltage
    Willing to help but I'm no expert.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Toshiba 23l1350u standby voltage present, won't power up

      Originally posted by dick_barton
      i would say that the backlight on is missing (around 3v) and also dim voltage
      +1

      12 blon 0
      13 dim 0
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 7972
        • Canada

        #4
        Re: Toshiba 23l1350u standby voltage present, won't power up

        BLon and the DIM signal are coming from the main board.

        Comment

        • koka0011
          Member
          • Apr 2013
          • 30
          • Sri Lanka

          #5
          Re: Toshiba 23l1350u standby voltage present, won't power up

          try replacing the 1117-ADJ regulator.it is on the main board.located near lvds connector.

          Comment

          • koka0011
            Member
            • Apr 2013
            • 30
            • Sri Lanka

            #6
            Re: Toshiba 23l1350u standby voltage present, won't power up

            i have highlighted the regulator
            Attached Files

            Comment

            • AcGeorgiegirl
              Badcaps Veteran
              • Jun 2013
              • 202
              • USA

              #7
              Re: Toshiba 23l1350u standby voltage present, won't power up

              Ok, I'll start with the regulator. Would it be smart to first test it, before ordering a replacement?
              Last edited by AcGeorgiegirl; 01-07-2017, 02:28 PM.

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #8
                Re: Toshiba 23l1350u standby voltage present, won't power up

                A check first would be useful.
                Attached Files
                Willing to help but I'm no expert.

                Comment

                • AcGeorgiegirl
                  Badcaps Veteran
                  • Jun 2013
                  • 202
                  • USA

                  #9
                  Re: Toshiba 23l1350u standby voltage present, won't power up

                  I get an input voltage of 5.21 and an output of 3.25.

                  Comment

                  • AcGeorgiegirl
                    Badcaps Veteran
                    • Jun 2013
                    • 202
                    • USA

                    #10
                    Re: Toshiba 23l1350u standby voltage present, won't power up

                    Originally posted by koka0011
                    try replacing the 1117-ADJ regulator.it is on the main board.located near lvds connector.
                    I've looked for the label on this regulator, and it doesn't have what you've indicated...does this matter? The number code on the second line reads "17-33"...with possibly being "17-331". The top line isn't readable except the last bit of "3BC". I am wanting to make sure I have the correct specs for seeing if the output I get is good.
                    Last edited by AcGeorgiegirl; 01-07-2017, 03:46 PM.

                    Comment

                    • vinceroger69
                      Badcaps Legend
                      • Mar 2012
                      • 6714
                      • uk

                      #11
                      Re: Toshiba 23l1350u standby voltage present, won't power up

                      Originally posted by AcGeorgiegirl
                      I get an input voltage of 5.21 and an output of 3.25.
                      maybe a IRU1117-33 in a 5V to 3.3V regulator so if it is it working ok

                      Comment

                      • Agent24
                        I see dead caps
                        • Oct 2007
                        • 4913
                        • New Zealand

                        #12
                        Re: Toshiba 23l1350u standby voltage present, won't power up

                        Are there any other regulators? I see some larger parts which could be higher current regulators. (From stock photos, seem to be U11, U13, U15)

                        There are also a few switching regulators, it seems.

                        Can we have a better photo of the mainboard?
                        Last edited by Agent24; 01-07-2017, 05:41 PM.
                        "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                        -David VanHorn

                        Comment

                        • AcGeorgiegirl
                          Badcaps Veteran
                          • Jun 2013
                          • 202
                          • USA

                          #13
                          Re: Toshiba 23l1350u standby voltage present, won't power up

                          Originally posted by Agent24
                          Are there any other regulators? I see some larger parts which could be higher current regulators. (From stock photos, seem to be U11, U13, U15)

                          There are also a few switching regulators, it seems.

                          Can we have a better photo of the mainboard?
                          I couldn't get in close enough for clarity, but here's some pics I hope will help.
                          Attached Files

                          Comment

                          • AcGeorgiegirl
                            Badcaps Veteran
                            • Jun 2013
                            • 202
                            • USA

                            #14
                            Re: Toshiba 23l1350u standby voltage present, won't power up

                            Originally posted by Agent24
                            Are there any other regulators? I see some larger parts which could be higher current regulators. (From stock photos, seem to be U11, U13, U15)

                            There are also a few switching regulators, it seems.

                            Can we have a better photo of the mainboard?
                            The three regulators you've indicated are correct...they read:

                            U11 no input voltage
                            U13 no input voltage
                            U15 input 4 v
                            output 2 v
                            *this one, at first was reading 3v as input, but a couple of minutes later was 4

                            Comment

                            • AcGeorgiegirl
                              Badcaps Veteran
                              • Jun 2013
                              • 202
                              • USA

                              #15
                              Re: Toshiba 23l1350u standby voltage present, won't power up

                              I am understanding this looks like a main board issue, right? Any suggestions as to what I can test for failure, or do you guys suggest just replacing the board? I'd much prefer learning how to repair what's wrong, which is what you guys are so good at helping with!
                              Attached Files
                              Last edited by AcGeorgiegirl; 01-12-2017, 10:51 AM. Reason: adding new picture

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Toshiba 23l1350u standby voltage present, won't power up

                                Yes, the main board problem, the key is to get the schematic diagram of the main board to do the component level troubleshooting of the complex main board.
                                Never stop learning
                                Basic LCD TV and Monitor troubleshooting guides.
                                http://www.badcaps.net/forum/showthr...956#post305956

                                Voltage Regulator (LDO) testing:
                                http://www.badcaps.net/forum/showthr...999#post300999

                                Inverter testing using old CFL:
                                http://www.badcaps.net/forum/showthr...er+testing+cfl

                                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                http://s807.photobucket.com/user/budm/library/

                                TV Factory reset codes listing:
                                http://www.badcaps.net/forum/showthread.php?t=24809

                                Comment

                                • dick_barton
                                  Badcaps Legend
                                  • Aug 2015
                                  • 6642
                                  • Wales

                                  #17
                                  Re: Toshiba 23l1350u standby voltage present, won't power up

                                  What's the resistance between Pin 12 (BLON) and Pin 1 (GND) at the power supply connector and the equivalent positions from the main board?
                                  Willing to help but I'm no expert.

                                  Comment

                                  • AcGeorgiegirl
                                    Badcaps Veteran
                                    • Jun 2013
                                    • 202
                                    • USA

                                    #18
                                    Re: Toshiba 23l1350u standby voltage present, won't power up

                                    Originally posted by budm
                                    Yes, the main board problem, the key is to get the schematic diagram of the main board to do the component level troubleshooting of the complex main board.
                                    Ok. Can you tell me, on the board, where the PN is, so I can start searching? I see two white labels that might be it, as well as what's written directly on the board at the far left top.

                                    Comment

                                    • AcGeorgiegirl
                                      Badcaps Veteran
                                      • Jun 2013
                                      • 202
                                      • USA

                                      #19
                                      Re: Toshiba 23l1350u standby voltage present, won't power up

                                      Originally posted by dick_barton
                                      What's the resistance between Pin 12 (BLON) and Pin 1 (GND) at the power supply connector and the equivalent positions from the main board?
                                      I'm not sure what I would put my DMM on as far as mode...would I use Ohm's mode and then set it to range at 200(the lowest setting)?
                                      ...and should the power be plugged in and turned on, etc?
                                      Last edited by AcGeorgiegirl; 01-12-2017, 11:13 AM. Reason: adding something

                                      Comment

                                      • vinceroger69
                                        Badcaps Legend
                                        • Mar 2012
                                        • 6714
                                        • uk

                                        #20
                                        Re: Toshiba 23l1350u standby voltage present, won't power up

                                        no power on as testing resistance then test between pin 12 and pin 1 and yes ohms mode

                                        Comment

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