Toshibia 40rv525u Blinking Power light

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  • knoxrebel
    Senior Member
    • Oct 2009
    • 168

    #1

    Toshibia 40rv525u Blinking Power light

    Was given this tv It was missing the power board, but i had the original part number. I installed the new board and the power light blinks but no picture.

    There is a click heard on the power board that is the same rate as the flash of the power light.

    I tested power coming out of the power board to the power switch/video board. Standyby 5v is good when no other boards are connected, but as soon as the video board/power button is connected the voltages pulse with the clicking and blinking of the lights.
    Filter Caps measure 170 across both.




    Sorry I don't have a camera today, if needed these pictures are the same as what i have.
    https://www.badcaps.net/forum/showth...light=40rv525u
  • knoxrebel
    Senior Member
    • Oct 2009
    • 168

    #2
    Re: Toshibia 40rv525u Blinking Power light

    Tested:
    u13-
    Pin 1 12v drops to 2.5
    pin 2 8v drops to 2.5

    u14-
    Pin 1 9v drops to 2
    pin 2 5v drops to .5

    u7-
    1 - 0v
    2 - 1.6 drops to 0
    3 - 3v drops to 0

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Toshibia 40rv525u Blinking Power light

      [Ignore this - I was being silly.] It's not a Vestel chassis. Is it a European or US model?
      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

        #4
        Re: Toshibia 40rv525u Blinking Power light

        Us

        Comment

        • knoxrebel
          Senior Member
          • Oct 2009
          • 168

          #5
          Re: Toshibia 40rv525u Blinking Power light

          Here are the pics of my boards. Wish they would bump up the size of the images allowed.
          Attached Files

          Comment

          • knoxrebel
            Senior Member
            • Oct 2009
            • 168

            #6
            Re: Toshibia 40rv525u Blinking Power light

            Bump

            Comment

            • knoxrebel
              Senior Member
              • Oct 2009
              • 168

              #7
              Re: Toshibia 40rv525u Blinking Power light

              Does this appear to be symptoms of a bad power board or an issue with the video board not allowing the unit to fully power on?

              EDIT: Shorted pwr pin to 5v standby. Tested all output voltages from power board and all voltages look good.
              Last edited by knoxrebel; 08-29-2012, 11:57 PM.

              Comment

              • Rtech
                Badcaps Legend
                • Jul 2010
                • 1095

                #8
                Re: Toshibia 40rv525u Blinking Power light

                |have you tried it with the Inverter disconnected ???

                Comment

                • knoxrebel
                  Senior Member
                  • Oct 2009
                  • 168

                  #9
                  Re: Toshibia 40rv525u Blinking Power light

                  Yes, I tried without the inverter.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Toshibia 40rv525u Blinking Power light

                    Can I see the closed up pictures of the connectors on the power supply board so I can see the function of the pins then I may be able to tell you how to do stand alone testing of the power supply 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

                    • knoxrebel
                      Senior Member
                      • Oct 2009
                      • 168

                      #11
                      Re: Toshibia 40rv525u Blinking Power light

                      Here they are.
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Toshibia 40rv525u Blinking Power light

                        Can you read DC voltage for me at P8 pin 4 (PWR) and the chassis when the TV is plugged in but not turn on, and when power switch is activated? Same for PIN 1 (INV).
                        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

                          #13
                          Re: Toshibia 40rv525u Blinking Power light

                          The pwr pin to ground goes up to 4.5v then to 0 repeatedly. Pin 1 (inv) to ground i get .5 peak then 0 repeatedly. No change when the power button is pressed. The power board is making a sound like it is coming on, the voltage peaks then drops and repeats.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Toshibia 40rv525u Blinking Power light

                            OK, it seems like the PWR on signal is toggling on and off. Put your meter on the 5V Pin and read the voltage when TV is OFF and when TV is on, I want to know what this 5V for the main board is doing steady.
                            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

                              #15
                              Re: Toshibia 40rv525u Blinking Power light

                              5v goes down to ~1.5 when the unit tries to power on. Power button has no effect.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Toshibia 40rv525u Blinking Power light

                                That 5V should be at 5V at all, it is always on the minute you plug the TV into the outlet. I still need to know if 5V is there BEFORE you hit the power switch, what I am trying to find out is: The main board is loading down the power supply, or the power supply just cannot supply enough power to run the board. This is the replacement you bought?
                                You can also disconnect the connector to the main board and put 10 Ohms 5watts to load the 5V output for about 1/2A to see if it can handle that.
                                You can also try replacing the caps in red circles for the 5V power supply section.
                                Attached Files
                                Last edited by budm; 08-30-2012, 11:19 PM.
                                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

                                  #17
                                  Re: Toshibia 40rv525u Blinking Power light

                                  The 5v is steady with no other boards plugged in. With the other boards plugged in the 5v is present as soon as the tv is plugged in, but immediately starts fluctuating. (not pressing pwr button)

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: Toshibia 40rv525u Blinking Power light

                                    Try new caps first. This 5V is always running 24/7 the minute the TV is plugged into the outlet, that is why it is called standby or always on power supply. It can fail after all these years being left plugged in 24/7.
                                    Did you also try loading the 5V line with the resistor? We want to make sure you do not have short circuits in your main board that is loading down this 5V power supply.
                                    Last edited by budm; 08-31-2012, 09:08 AM.
                                    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

                                      #19
                                      Re: Toshibia 40rv525u Blinking Power light

                                      Those are very good Rubycon caps. Why are you replacing them? They hardly ever fail.
                                      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

                                        #20
                                        Re: Toshibia 40rv525u Blinking Power light

                                        Well I see lots of bad Rubycon caps from my experience also.
                                        Even MAC computers failed due to bad Rybycon caps.
                                        Attached Files
                                        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

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