Please Help!!

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  • StevieG
    Member
    • Aug 2012
    • 19
    • uk

    #1

    Please Help!!

    Hi could anyone tell me how to fix this please.
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Please Help!!

    What kind of components that fit into those holes? If they are through hole components, I would use 24AWG solid bare wire and wrap the wire aorund the component's legs then solder, then I would apply epoxy glue on top of it.
    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

    • StevieG
      Member
      • Aug 2012
      • 19
      • uk

      #3
      Re: Please Help!!

      Originally posted by budm
      What kind of components that fit into those holes? If they are through hole components, I would use 24AWG solid bare wire and wrap the wire aorund the component's legs then solder, then I would apply epoxy glue on top of it.
      RD15HVF1 RF Power Transistor

      The thing is most of the track as come off as you can see in picture. i gave it to a mate who said he could fix it and ended up coming back looking like that.
      he burnt the tracks with the soldering iron and took the track off. i just can't see where it joins as im not good at this sort of thing.

      http://www.ebay.com/itm/2pcs-MITSUBI...05%26rk%3D1%26
      Last edited by StevieG; 08-15-2012, 08:48 AM.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Please Help!!

        OK, you trying to figure out how all the legs of the components are hooked up to each other and the orientation of the transistor due to the old copper traces are gone.
        Can I see the top side of the board then I may be able to figure out which hole is the the Gate of the transistor.
        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

        • StevieG
          Member
          • Aug 2012
          • 19
          • uk

          #5
          Re: Please Help!!

          Originally posted by budm
          OK, you trying to figure out how all the legs of the components are hooked up to each other and the orientation of the transistor due to the old copper traces are gone.
          Can I see the top side of the board then I may be able to figure out which hole is the the Gate of the transistor.
          Top Part of board.
          Attached Files

          Comment

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: Please Help!!

            What is the board part number and what is it off
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • StevieG
              Member
              • Aug 2012
              • 19
              • uk

              #7
              Re: Please Help!!

              theres no number on the board. its of a fm transmitter. Chinese i think it is.
              Last edited by StevieG; 08-15-2012, 09:21 AM.

              Comment

              • StevieG
                Member
                • Aug 2012
                • 19
                • uk

                #8
                Re: Please Help!!

                ive been looking at the board for over 2 weeks now, but i just can't see whats what. its just a maze to me. i just hope it can be fixed

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Please Help!!

                  OK, This MOSFET is used for the RF Power amp putput stage, Pin 2 of this MOSFET is SOURCE pin instead of DRAIN pin like other MOSFET, but since it is made for RF circuits which need to have minimum stray capacitance in the construction of the silicone die and the internal lead connection, they make pin 2 (middle pin) as a source pin.
                  Please se picture and spec sheet on how to put this MOSFET in place.
                  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

                  • StevieG
                    Member
                    • Aug 2012
                    • 19
                    • uk

                    #10
                    Re: Please Help!!

                    Originally posted by budm
                    OK, This MOSFET is used for the RF Power amp putput stage, Pin 2 of this MOSFET is SOURCE pin instead of DRAIN pin like other MOSFET, but since it is made for RF circuits which need to have minimum stray capacitance in the construction of the silicone die and the internal lead connection, they make pin 2 (middle pin) as a source pin.
                    Please se picture and spec sheet on how to put this MOSFET in place.
                    Many thanks for that i will give it a try now and let you know how it all go's

                    Steve

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Please Help!!

                      Just make to see the spec sheet on the pin out. Good luck.
                      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

                      • StevieG
                        Member
                        • Aug 2012
                        • 19
                        • uk

                        #12
                        Re: Please Help!!

                        Originally posted by budm
                        Just make to see the spec sheet on the pin out. Good luck.
                        hi again. soldered that as in picture. but no power getting through the board when switched on, maybe a break on a trace somewhere ?

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Please Help!!

                          Do you get the power before? Can I see the whole picture of the board so I can see where the power is applied and the way you have install the MOSFET?
                          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

                          • StevieG
                            Member
                            • Aug 2012
                            • 19
                            • uk

                            #14
                            Re: Please Help!!

                            2 mins i get a picture

                            Comment

                            • StevieG
                              Member
                              • Aug 2012
                              • 19
                              • uk

                              #15
                              Re: Please Help!!

                              Originally posted by budm
                              Do you get the power before? Can I see the whole picture of the board so I can see where the power is applied and the way you have install the MOSFET?
                              There was power before my mate burnt the track off the board. but i never tryed it without the rf resisstor.

                              heres a couple of pictures of the board.
                              Attached Files

                              Comment

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #16
                                Re: Please Help!!

                                Might seem a silly question but where does the power feed into the board and what voltage is it?
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Please Help!!

                                  That power cable? (the gray cable on the bottom right of the board as shown in pic1, see if there is shortes circuits there, see if you have any voltage on that blue electrolytic by that gray cable.
                                  I see a DC input jack by the gray cable 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

                                  Comment

                                  • StevieG
                                    Member
                                    • Aug 2012
                                    • 19
                                    • uk

                                    #18
                                    Re: Please Help!!

                                    Originally posted by budm
                                    That power cable? (the gray cable on the bottom right of the board as shown in pic1, see if there is shortes circuits there, see if you have any voltage on that blue electrolytic by that gray cable.
                                    I see a DC input jack by the gray cable also.
                                    No voltage there. the grey cable is to switch it on. and your right thats where the 12v dc power go's. ive got no way in testing the board as i don't have a metre

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Please Help!!

                                      You need the meter for sure, do not leave the power connected since you may have short circuits somewhere or you may have bad power source, power switch, etc.
                                      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

                                      • StevieG
                                        Member
                                        • Aug 2012
                                        • 19
                                        • uk

                                        #20
                                        Re: Please Help!!

                                        Originally posted by budm
                                        You need the meter for sure, do not leave the power connected since you may have short circuits somewhere or you may have bad power source, power switch, etc.
                                        Just tested it by touching the 12v dc wires straight 2 the circiut board and it powers up ok. but when trying to power up through the proper way nothing happens.

                                        Comment

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