Can someone help me find this component so I can get my fan working on this HD 7950

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  • Rob
    Member
    • Oct 2005
    • 47
    #21
    Re: Can someone help me find this component so I can get my fan working on this HD 79

    I soldered the 2N3904 Surface mount transistor on and all the fan does is twitch. It never did twitch so it tells me that maybe the transistor is not allowing enough current perhaps? I did solder it twice with 2 different transistors to make sure I didn't mess up. Both same outcome.

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 31138
        • Albion
        #22
        Re: Can someone help me find this component so I can get my fan working on this HD 79

        meter the fan wires to check the voltage.
        and it may sound obvious, but did you actually test the fan?

          Comment

          • SteveNielsen
            Retired Tech
            • Jun 2012
            • 2327
            • USA
            #23
            Re: Can someone help me find this component so I can get my fan working on this HD 79

            See post #3

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA
                #24
                Re: Can someone help me find this component so I can get my fan working on this HD 79

                Check the Base-Emitter voltage to see if the base drive is pulsing also.
                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

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