Sanyo DP47840

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  • apexlights
    Member
    • Sep 2015
    • 13
    • USA
    #1

    Sanyo DP47840

    Thanks to anyone and everyone that can help.

    Would heating a capacitor up with a heat gun / hair dryer give it some extra life it was on it's way out?
    It show no signs of bulging at all.

    I have this 47" Sanyo tv Model#dp47480 and it won't turn on.
    I had a feeling it was the first 2 resistors in the power section and so I replaced them.
    Then the TV turned on.
    After I turned it off and it would sporadically turn on and off when i pressed the power button.
    So then I went and got a hair dryer and heated the 2 main capacitors and bam the TV turns on instantly.
    I am in the process of checking all the solder point in that are but what I am thinking is when i soldered in the new resistors it heated the caps a bit and that's why it turned on. There are a few other components in the area but my real question is.
    Last edited by apexlights; 10-14-2015, 05:43 PM.
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Sanyo DP47840

      "So then I went and got a hair dryer and heated the 2 main capacitors and bam the TV turns on instantly." Are you talking about the 450VDC main filter caps in the primary side of the power supply? Pictures?
      When cap is heat up the ESR will go down, so if the bad cap has high ESR the circuit will not function properly so when the ESR goes down the circuit will work again.
      Bad cap can look normal, that is why you need to at least test the capacitance and the ESR of the suspected bad cap.
      May it is the strat-up/running caps close by that are bad.
      Last edited by budm; 10-14-2015, 09:50 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

        • apexlights
          Member
          • Sep 2015
          • 13
          • USA
          #3
          Re: Sanyo DP47840

          Sorry I have a basic multimeter that does ohms, volts, and amps.
          It does not have an option for capacitance.
          I have the service manual and they are capacitors c608 and c614.
          They are 250v - 470uf.
          I have considered I could be heating something else up and I am not sure how to go about figuring out which caps they are without upgrading to a new meter. I would say that it is the start up caps that are bad since once the TV is on it runs fine. Had it on for 2 hours today after it started. Not sure which caps are responsible for starting it. I am uploading a picture of the power section and the area I heated up. There are some other smaller caps in the area.

          Here is a link to the manual.
          http://support.karat-service.net/TV/...0-00%20N8VE%20[SM].rar
          Attached Files

          if you find these attachements useful please consider making a small donation to the site

            Comment

            • fzabkar
              Badcaps Veteran
              • Mar 2009
              • 772
              • Australia
              #4
              Re: Sanyo DP47840

              I would replace C619. This capacitor develops the auxiliary voltage that powers the PWM IC after the initial kickstart. These capacitors are often responsible for intermittent startup problems.
              Attached Files

              if you find these attachements useful please consider making a small donation to the site

                Comment

                • apexlights
                  Member
                  • Sep 2015
                  • 13
                  • USA
                  #5
                  Re: Sanyo DP47840

                  OK hit that one with some heat and the TV popped on right away!
                  Gonna check it again in a bit.

                  Think this is the cap!

                  http://www.digikey.com/product-detai...302-ND/3134258

                  Thanks a ton for your help fzabkar. Got this 47" tv on craigslist for $50.
                  Last edited by apexlights; 10-15-2015, 07:49 AM.

                    Comment

                    • apexlights
                      Member
                      • Sep 2015
                      • 13
                      • USA
                      #6
                      Re: Sanyo DP47840

                      Got the new cap in the mail and it works perfect.
                      Thanks again. If the TV goes out or anything else happens I'll let you know.
                      I'm about to get the 42" Sanyo DP42849 off craigslist for $40 hopefully just as easy a fix.

                        Comment

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