Bush IDLCD26TV16HD POS120 blowing F2

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  • Ralph Green
    Senior Member
    • Feb 2013
    • 66
    • UK

    #1

    Bush IDLCD26TV16HD POS120 blowing F2

    Hi all. I'm having problem with this PSU it keeps blowing F2. Does anybody know what is causing this?
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Bush IDLCD26TV16HD POS120 blowing F2

    Where is F2? Pictures?
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • Ralph Green
      Senior Member
      • Feb 2013
      • 66
      • UK

      #3
      Re: Bush IDLCD26TV16HD POS120 blowing F2

      Is next to big cap EC2

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Bush IDLCD26TV16HD POS120 blowing F2

        I don't have this power supply in front of me so you'll have to help me and others out by providing pictures.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • Ralph Green
          Senior Member
          • Feb 2013
          • 66
          • UK

          #5
          Re: Bush IDLCD26TV16HD POS120 blowing F2

          I put glass fuse, but it will blow up straight after power on the TV.
          Attached Files

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Bush IDLCD26TV16HD POS120 blowing F2

            Checked the bridge rectifier?
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • Ralph Green
              Senior Member
              • Feb 2013
              • 66
              • UK

              #7
              Re: Bush IDLCD26TV16HD POS120 blowing F2

              Yes and is ok. There is red LED and is blinging only.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Bush IDLCD26TV16HD POS120 blowing F2

                What about the FETs for the PFC?
                How is the PFC capacitor?
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • Ralph Green
                  Senior Member
                  • Feb 2013
                  • 66
                  • UK

                  #9
                  Re: Bush IDLCD26TV16HD POS120 blowing F2

                  All capacitors are new. This is something to the backlight I think.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Bush IDLCD26TV16HD POS120 blowing F2

                    The primary (PFC) capacitor is an original CapXon. I can see the disc bulging on it, which can sometimes indicate the capacitor is bad. (If the disc can be pushed back down, it is usually OK.)
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • Ralph Green
                      Senior Member
                      • Feb 2013
                      • 66
                      • UK

                      #11
                      Re: Bush IDLCD26TV16HD POS120 blowing F2

                      Originally posted by tom66
                      The primary (PFC) capacitor is an original CapXon. I can see the disc bulging on it, which can sometimes indicate the capacitor is bad. (If the disc can be pushed back down, it is usually OK.)
                      What cap is it?

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Bush IDLCD26TV16HD POS120 blowing F2

                        Just below the fuse in your picture.
                        https://www.badcaps.net/forum/attach...7&d=1369758581
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

                        • Ralph Green
                          Senior Member
                          • Feb 2013
                          • 66
                          • UK

                          #13
                          Re: Bush IDLCD26TV16HD POS120 blowing F2

                          That is a glue. Cap looks good.

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Bush IDLCD26TV16HD POS120 blowing F2

                            Aside from the caps and fuse, have you replaced anything else?
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • Ralph Green
                              Senior Member
                              • Feb 2013
                              • 66
                              • UK

                              #15
                              Re: Bush IDLCD26TV16HD POS120 blowing F2

                              No, just fuse and caps. Could you guys help me to test two transistors?
                              Q16 and Q17 both are 9N50CF.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: Bush IDLCD26TV16HD POS120 blowing F2

                                Test between all three pins for any shorts; that finds most bad transistors.
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

                                • Ralph Green
                                  Senior Member
                                  • Feb 2013
                                  • 66
                                  • UK

                                  #17
                                  Re: Bush IDLCD26TV16HD POS120 blowing F2

                                  Both are beeping between all three pins using continuous meter. So I think we found what is wrong with this PSU. I will buy new transistors and let you know later.

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: Bush IDLCD26TV16HD POS120 blowing F2

                                    If the transistors are shorted, the driver IC connected to them could also be damaged.
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • Ralph Green
                                      Senior Member
                                      • Feb 2013
                                      • 66
                                      • UK

                                      #19
                                      Re: Bush IDLCD26TV16HD POS120 blowing F2

                                      I can not see any IC connected to them. There is only few resistors and one smd diode connected to each one transistor.

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: Bush IDLCD26TV16HD POS120 blowing F2

                                        I can guarantee you if this is a modern SMPS they will be driven by a controller chip. It might be on the top side.
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

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