westinghouse vr3215

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  • lookimback
    Badcaps Legend
    • Aug 2013
    • 1489
    • USA

    #41
    Re: westinghouse vr3215

    510 ohms 5%. When I test it I get 518 ohms cold. I'll let it get hot and check then too.
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    Comment

    • lookimback
      Badcaps Legend
      • Aug 2013
      • 1489
      • USA

      #42
      Re: westinghouse vr3215

      When powered on I get 0 ohms. When hot, while cooling, I get resistance starting between 0 and 50 ohms and increasing about 3-5 ohms per second. Freeze spray has no effect other than making resistance increase faster when powered off.
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      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #43
        Re: westinghouse vr3215

        That resistor will dissipate a little bit over 1 Watt of power. You cannot check the resistance when circuit is powered up. It is just a bleeder resistor to drain the 24V power supply when the TV is turn off and also gives a little load to the 24V power supply.
        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

        • lookimback
          Badcaps Legend
          • Aug 2013
          • 1489
          • USA

          #44
          Re: westinghouse vr3215

          So its normal to get hot?
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          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #45
            Re: westinghouse vr3215

            1 Watt on small body can be hot. The circuit will function without that resistor in place, you can verify that the resistor is connected in parallel with the filter cap or not by checking the connection between the legs of the cap and the resistor.
            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

            • lookimback
              Badcaps Legend
              • Aug 2013
              • 1489
              • USA

              #46
              Re: westinghouse vr3215

              I did that, it is parallel. I figured there would be some heat since some of the energy passing through resistance is converted to heat. I just wasn't sure what was normal.
              What about the SMD caps C209 and C210 not having any voltage and also not being a negative or ground? I noticed that one side of them is on the same pad as the big tab on 2 of the MOSFETs.
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              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #47
                Re: westinghouse vr3215

                At this point I cannot tell much unless we can get the spec sheet of that PWM IC which drives those 4 MOSFETs. The inverter is just not putting out enough high voltage to drive the lamps right now.
                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

                • lookimback
                  Badcaps Legend
                  • Aug 2013
                  • 1489
                  • USA

                  #48
                  Re: westinghouse vr3215

                  I was trying to find the data sheet for that but no luck. I'll keep looking.
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                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #49
                    Re: westinghouse vr3215

                    By the way, did you test those 4 MOSFET.
                    Looking at it with big tab up
                    pin1 = left pin (Gate)
                    Pin2 = biag tab (Drain)
                    pin 3 = Right tab (Source)
                    Just measure the resistance of
                    1 & 2 =
                    1 & 3 =
                    2 & 3 =
                    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

                    • lookimback
                      Badcaps Legend
                      • Aug 2013
                      • 1489
                      • USA

                      #50
                      Re: westinghouse vr3215

                      I had done 1 & 3 on all of them. I'll do them all when I get home from work (about 9:30 eastern time).
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                      Comment

                      • lookimback
                        Badcaps Legend
                        • Aug 2013
                        • 1489
                        • USA

                        #51
                        Re: westinghouse vr3215

                        OK, resistances of the MOSFETs are as follows.
                        Amp4015p (1) closest to power connector
                        1 & 2 12.02m
                        1 & 3 9.99k
                        2 & 3 9.8m

                        Amp4010n (1) closest to power connector
                        1 & 2 9.98m
                        1 & 3 39k
                        2 & 3 12.06m

                        Amp4015p (2)
                        1 & 2 12.04m
                        1 & 3 10.01k
                        2 & 3 9.9m

                        Amp4010n (2)
                        1 & 2 11.95m
                        1 & 3 42.3k
                        2 & 3 10.10m
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                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #52
                          Re: westinghouse vr3215

                          Well,, they do not have any very low resistance value at all. I really do not know what else for you to test at this point, running out of Idea.
                          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

                          • lookimback
                            Badcaps Legend
                            • Aug 2013
                            • 1489
                            • USA

                            #53
                            Re: westinghouse vr3215

                            My ESR meter got delivered today. I'll go pick it up tomorrow.
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                            Comment

                            • lookimback
                              Badcaps Legend
                              • Aug 2013
                              • 1489
                              • USA

                              #54
                              Re: westinghouse vr3215

                              Well, I didn't want to have to buy a new inverter board but I have a buyer waiting on me so I didn't have much choice. Got lucky and found one on eBay for $32 with free shipping. I think with a working board for a reference we might be able to figure out the other one. In any event, I've learned more from this TV than all the others combined.
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                              Comment

                              • lookimback
                                Badcaps Legend
                                • Aug 2013
                                • 1489
                                • USA

                                #55
                                Re: westinghouse vr3215

                                I got my ESR meter and tested the cap I replaced. Its got an ESR of 0.10 ohms. The meter is telling me its leaky. Maybe that cap won't work after all. I have some Panasonic FCs coming. The cap I took out had an ESR of 0.06 ohms.

                                Edit: The small tan cap that is parallel with the big resistor has an ESR of 0.37 ohms. The meter says its leaky. It is marked 104. What size would that be for a replacement?
                                Last edited by lookimback; 09-24-2013, 08:13 AM.
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                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #56
                                  Re: westinghouse vr3215

                                  Ceramic cap marked 104 will not accurately test on most ESR meters.
                                  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

                                  • lookimback
                                    Badcaps Legend
                                    • Aug 2013
                                    • 1489
                                    • USA

                                    #57
                                    Re: westinghouse vr3215

                                    I have a Peak Atlas ESR70. I couldn't get it to work on the little blue ceramic caps either.
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                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #58
                                      Re: westinghouse vr3215

                                      There are two SMD DC blocking caps in series with the primary side of the inverter transformer (see the SCH I posted), if they are bad, it will also cause the transformers not be driven correctly.
                                      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

                                      • lookimback
                                        Badcaps Legend
                                        • Aug 2013
                                        • 1489
                                        • USA

                                        #59
                                        Re: westinghouse vr3215

                                        C209 and C210? I tested them and the meter didn't say they were bad. I'll test them again and post the ESR when I get home tonight.
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                                        Comment

                                        • lookimback
                                          Badcaps Legend
                                          • Aug 2013
                                          • 1489
                                          • USA

                                          #60
                                          Re: westinghouse vr3215

                                          OK, I read the instructions that came with the ESR meter. It wasn't telling me the caps were bad. It was saying in circuit/leaky because it couldn't read the capacitance. So, the DC blocking caps both read 370uf 0.06 ohms. They are parallel so this doesn't really tell me if one is bad.
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                                          Comment

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