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Phillips 50PF7220A/37B - seven red flashing lights.

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    #21
    Re: Phillips 50PF7220A/37B - seven red flashing lights.

    Originally posted by Th3_uN1Qu3 View Post
    Now, please test the primary transistor(s) to determine whether they need replacement as well.
    Am glad to do so if you could be so kind as to point out their location and description, thanks.
    Stolen Sig: I want my own Law, like Ohm, Murphy and Cole.

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      #22
      Re: Phillips 50PF7220A/37B - seven red flashing lights.

      Originally posted by Spock View Post
      Am glad to do so if you could be so kind as to point out their location and description, thanks.
      See post #5, point 2. Once you find it, list the part number and look for its datasheet for confirmation. The datasheet will say powerfet or something like that.

      If you can't find it, provide more pictures of the front side on the board. We may need to see the chips attached to the heatsinks.

      PS. The fet will be on the hot side of the board.
      Last edited by retiredcaps; 01-15-2012, 07:20 PM.
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        #23
        Re: Phillips 50PF7220A/37B - seven red flashing lights.

        Just noticed on the backside, there are two brown/black spots on these transistors. Is that flux residue or physical damage?

        See red circles.
        Attached Files
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          #24
          Re: Phillips 50PF7220A/37B - seven red flashing lights.

          Originally posted by retiredcaps View Post
          Just noticed on the backside, there are two brown/black spots on these transistors. Is that flux residue or physical damage?

          See red circles.
          Whilst I'm no expert, I can't see any physical damage so I suspect it's flux residue as I can see other components with similar but smaller marks. Most of the marks will rub off with an alcohol swab.
          Stolen Sig: I want my own Law, like Ohm, Murphy and Cole.

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            #25
            Re: Phillips 50PF7220A/37B - seven red flashing lights.

            Originally posted by retiredcaps View Post

            See red circles.
            Those are numbered Q8001 and Q8003. The component at Q8001, again cleverly hidden under a heatsink, is numbered DE3523 which Google tells me is a Power MOSFET. How should I test it? Remember I'm new to this so I would appreciate the "idiots" guide.

            Thanks.
            Stolen Sig: I want my own Law, like Ohm, Murphy and Cole.

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              #26
              Re: Phillips 50PF7220A/37B - seven red flashing lights.

              Originally posted by Spock View Post
              How should I test it?
              1) Number the pins 1, 2, and 3.

              2) Measure the resistance between pins 1-2, 1-3, and 2-3. You can perform this in circuit.

              3) Any reading under 30 ohms suggests a short and requires you to desolder the component and retest out of circuit.
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                #27
                Re: Phillips 50PF7220A/37B - seven red flashing lights.

                Hello gents. I have a similar issue. The symptoms is that I get the red flashing light. When I unplug and replug the power cord, I can hear a relay or switch inside the TV. The light start off green but it will disappear then the red light comes on without the tv powering up. The funny thing is that unplugging the TV works sometimes. I opened the back of my tv to look for any obvious damage but there isn't any visual damages or burnt smell. I know it has to be a switching device but I haven't troubleshoot a circuit board in many years plus I have no schematic. Just looking for some kind of help. I know has to be a simple fix. Thanks in advance.

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