Toshibia 40rv525u Blinking Power light

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Toshibia 40rv525u Blinking Power light

    Originally posted by budm
    Well I see lots of bad Rubycon caps from my experience also.
    Even MAC computers failed due to bad Rybycon caps.
    I've seen bad Rubycons too, just like I have seen bad Panasonic, bad Nichicon and bad Chemicon. The failures have only occurred (in my experience) on motherboards, which are brutal places for capacitors to operate, especially with the high ripple current and high temperatures. In general, in a power supply, they are excellent caps, with very good reliability.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Toshibia 40rv525u Blinking Power light

      I will never rule out any brand of caps, if it is made by human, it can fail.
      At this point he needs to put dummy load on the 5V line to see if it can even handle 1/2A load.
      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

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Toshibia 40rv525u Blinking Power light

        Originally posted by budm
        I will never rule out any brand of caps, if it is made by human, it can fail.
        At this point he needs to put dummy load on the 5V line to see if it can even handle 1/2A load.
        Most caps are machine made now. But I would generally look elsewhere before suggesting cap failure with good caps. The dummy load is a good idea. Three (1.5V) torch bulbs in series provides approx 300mA load for reference.
        Last edited by tom66; 08-31-2012, 12:59 PM.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • knoxrebel
          Senior Member
          • Oct 2009
          • 168

          #24
          Re: Toshibia 40rv525u Blinking Power light

          I tested the power board with a long string of leds. The power supply turned on and supplied good stable 5v, 12v and 24v without voltage dropping.

          Could the problem be a 8-pin soic power mosfet right near the connector on the video board?

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #25
            Re: Toshibia 40rv525u Blinking Power light

            LED's will only draw about 0.02A (or 20mA), very very low current.
            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

            • knoxrebel
              Senior Member
              • Oct 2009
              • 168

              #26
              Re: Toshibia 40rv525u Blinking Power light

              Would a 10ohm 2 watt resistor suffice? Don't have any bulbs that work
              On that little of a voltage.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #27
                Re: Toshibia 40rv525u Blinking Power light

                Yes, try 10 Ohms first (this will draw 0.5A, power will be 2.5Watt), just long enough to see if 5V will stay at 5V.
                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

                • knoxrebel
                  Senior Member
                  • Oct 2009
                  • 168

                  #28
                  Re: Toshibia 40rv525u Blinking Power light

                  Hooked up a 4.75v .5A flashlight bulb between pwr and 5v. Board is supplying steady 5v,12v, and 24 output from all connectors.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Toshibia 40rv525u Blinking Power light

                    It looks like your 5v is OK, but how did you get the 12V/24V reading without having the main board hook up to get the PS_ON signal from the main board to turn on the 12/24V power supply section.
                    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

                    • knoxrebel
                      Senior Member
                      • Oct 2009
                      • 168

                      #30
                      Re: Toshibia 40rv525u Blinking Power light

                      not sure, thought it used the pwr pin?

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: Toshibia 40rv525u Blinking Power light

                        So If you hook every thing back together, will the 5V go low again? If it does, then the main board must be drawing too much current than the 5V power supply can handle, that is the only reason I can think of.
                        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

                        • knoxrebel
                          Senior Member
                          • Oct 2009
                          • 168

                          #32
                          Re: Toshibia 40rv525u Blinking Power light

                          How can we determine where the short is on the video board?

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #33
                            Re: Toshibia 40rv525u Blinking Power light

                            http://www.youtube.com/watch?v=_1pxf4faLAY
                            and/or
                            http://www.youtube.com/watch?v=XhqwC3BFBug
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

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