Polaroid TV - PSU HA220T2A1 repair

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  • tn245
    Badcaps Veteran
    • Oct 2013
    • 530
    • UK
    #1

    Polaroid TV - PSU HA220T2A1 repair

    Quick question. Got this TV PSU with the primary mosfet Q5 shorted. Going to change the mosfet and smps ic. The gate resistors and diode have exploded so unable to read their values. What values should be used here for R74 R35 and D6? The mosfet is 6n60 and smps ic l6565.
    Attached Files
    Last edited by tn245; 03-14-2017, 08:05 AM.
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Polaroid TV - PSU HA220T2A1 repair

      You can use what the application circuit uses.
      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

        • tn245
          Badcaps Veteran
          • Oct 2013
          • 530
          • UK
          #3
          Re: Polaroid TV - PSU HA220T2A1 repair

          Thanks. The configuration here seems slightly different from the application circuit. In that on the board R74 is in series with R35 and D6 which are in parallel with each other. Does that make any difference?

          Application gate drive:
          Attached Files

            Comment

            • Andrew F. Ali
              Badcaps Legend
              • Jan 2014
              • 2450
              • Trinidad & Tobago
              #4
              Re: Polaroid TV - PSU HA220T2A1 repair

              No it shouldn't...Try it...you have nothing to loose.
              Last edited by Andrew F. Ali; 03-14-2017, 04:53 PM.

                Comment

                • tn245
                  Badcaps Veteran
                  • Oct 2013
                  • 530
                  • UK
                  #5
                  Re: Polaroid TV - PSU HA220T2A1 repair

                  There seems to be a bit more going on with this PSU. I fired it up with a 100W bulb in series. It lights bright then goes out, but I've got no +5V standby. Main cap is at 330V. Which part of the circuit is responsible for +5V? I find it hard to figure out without a schematic. Nothing else seems to be shorted.
                  Attached Files

                    Comment

                    • tn245
                      Badcaps Veteran
                      • Oct 2013
                      • 530
                      • UK
                      #6
                      Re: Polaroid TV - PSU HA220T2A1 repair

                      Pin 8 Vcc of IC5 is fluctuating between 10 and 12V so it is not starting up. Have replaced start up cap and zd1 but still fluctuating. Start up resistors, 3 in series at 255K each measure ok. What else could be causing the fluctuating Vcc?

                        Comment

                        • dick_barton
                          Badcaps Legend
                          • Aug 2015
                          • 6642
                          • Wales
                          #7
                          Re: Polaroid TV - PSU HA220T2A1 repair

                          There's a repair kit which may be able to guide you.
                          http://www.ohmsupplies.co.uk/epages/...roducts/KIT198
                          Willing to help but I'm no expert.

                            Comment

                            • tn245
                              Badcaps Veteran
                              • Oct 2013
                              • 530
                              • UK
                              #8
                              Re: Polaroid TV - PSU HA220T2A1 repair

                              Thanks. Looks like I've replaced or tested everything listed in that kit so far. They don't list the smd resistors and diode I had burned interestingly. Maybe I should replace the start-up resistors anyway even though they are testing ok on the meter.

                                Comment

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