Thermaltake TR2 RX-550 dead

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  • everell
    Badcaps Legend
    • Jan 2009
    • 1514
    • USA
    #1

    Thermaltake TR2 RX-550 dead

    I have a dead Thermaltake TR2 RX-550. This one has me stumped! Fuse OK, 166 volts to the main capacitor, but no 5vsb. For the 5vsb circuit, it has a 6 pin pwm surface mount chip on the bottom of the pc board which drives a TO-220 transistor. I cannot identify this chip. Can anyone tell what it is?????
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    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)
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    • rievax_60
      Badcaps Veteran
      • May 2012
      • 897
      • australia
      #2
      Re: Thermaltake TR2 RX-550 dead

      I went looking for something like that for a TV power supply. I picked the R7731A from this selection.
      http://au.element14.com/webapp/wcs/s...4239,111853290
      I found parts from many other manufacturers that would have worked also.
      The choice was between two basic types where the difference was the function of pin 3.
      With one type, pin 3 is for connecting a resistor to set the frequency. Pin 3 on the other type is to connect a thermistor for thermal protection. Send us a close up photo of the surrounding components.
      Last edited by rievax_60; 12-22-2015, 08:55 PM.

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        • pdavid
          Badcaps Veteran
          • Jan 2011
          • 279
          • Hungary
          #3
          Re: Thermaltake TR2 RX-550 dead

          This looks like a LD7535BL or SG6848TZ1. I replaced these in several bad CWT based Chieftec and Thermaltake units. My guess is that these are the most popular sot23-6 devices used in the standby.
          Last edited by pdavid; 12-23-2015, 02:43 AM.

            Comment

            • rievax_60
              Badcaps Veteran
              • May 2012
              • 897
              • australia
              #4
              Re: Thermaltake TR2 RX-550 dead

              Originally posted by pdavid
              This looks like a LD7535BL or SG6848TZ1. I replaced these in several bad CWT based Chieftec and Thermaltake units. My guess is that these are the most popular sot23-6 devices used in the standby.
              That is functionally the same as the R7731A and a few others that I found. Pin 3
              is used for a frequency setting resistor.

                Comment

                • pdavid
                  Badcaps Veteran
                  • Jan 2011
                  • 279
                  • Hungary
                  #5
                  Re: Thermaltake TR2 RX-550 dead

                  Originally posted by rievax_60
                  That is functionally the same as the R7731A and a few others that I found.
                  You are correct. So far I haven't seen the thermal supervision feature used there in PC power supplies

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