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BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

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    BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

    Hi Guys i got this tv from a friend to see if i could fix it for him he said he plugged it in and it went bang so i opened it up and noticed a resister with a chip on it so replaced it and also q1 which was shorted ( circled in red ) which is a FQPF8N60C transiter so replaced that and also two diodes (RL205 ) which was testing both ways so replaced them it its still blowing the fuse any ides guys any help much appreciated
    Attached Files
    Last edited by garrymc123; 06-07-2018, 02:33 AM.
    Your never to old to learn

    #2
    Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

    What is the part number on IC1 on the underside of the power supply?
    Willing to help but I'm no expert.

    Comment


      #3
      Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

      Cheers Dick_Barton its a js2269sp
      Attached Files
      Your never to old to learn

      Comment


        #4
        Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

        I can't find any information on it but maybe someone will be able to.
        Willing to help but I'm no expert.

        Comment


          #5
          Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

          Were all three legs shorted on Q1 fet, if they were its a VERY good chance the ic is bad. ic's don't like 160v on gate drive pin.
          Seems to be same as OB2269
          Attached Files
          Last edited by R_J; 06-07-2018, 04:48 PM.

          Comment


            #6
            Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

            I couldn't find any info either on that chip. I will check tonight when I get home and check for short on pins and let you guys know cheers
            Your never to old to learn

            Comment


              #7
              Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

              Looks like JS2269 to me or is the J an O with part of the print missing?

              Comment


                #8
                Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

                Hi Guys have tested the ic1 and no shorts found but I have found that I have continuity on cap 1 is it because its a 400v cap on the primary side the multimeter has continuity on this cap?
                Attached Files
                Last edited by garrymc123; 06-08-2018, 02:40 PM. Reason: Wrong Pics
                Your never to old to learn

                Comment


                  #9
                  Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

                  Originally posted by garrymc123 View Post
                  Hi Guys have tested the ic1 and no shorts found but I have found that I have continuity on cap 1 is it because its a 400v cap on the primary side the multimeter has continuity on this cap?
                  How did you go about testing for shorts on that IC?
                  What resistance do you see on the main filter cap?
                  The replacement MOSFET still tested OK?
                  When that MOSFET shorted out it will more likely take out the IC at the same time, and if IC output stuck high it will cause the new MOSFET to be stuck on and will blow the fuse and may also damage the new MOSFET.
                  Last edited by budm; 06-08-2018, 03:26 PM.
                  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


                    #10
                    Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

                    Originally posted by budm View Post
                    how did you go about testing for shorts on that ic?
                    What resistance do you see on the main filter cap?
                    The replacement mosfet still tested ok?
                    When that mosfet shorted out it will more likely take out the ic at the same time, and if ic output stuck high it will cause the new mosfet to be stuck on and will blow the fuse and may also damage the new mosfet.
                    +10

                    Comment


                      #11
                      Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

                      Hi Guys Yes all three legs shorted on q1 I tested ic1 with continuity on each pin and had no bleep on the meter and I'm getting 000.9ohm resistance on the main cap I have just rechecked q1 and all three legs are shorted again and I'm getting continuity on all three pins from q1 to pin1 which is ground on ic1 ..Will I replace q1 and ic1 and take it from there is there anything else I should check and also what will I replace ic1 with if I can't find any info on it.. will OB2269 do the same job .. Thanks in Advance
                      Your never to old to learn

                      Comment


                        #12
                        Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

                        Need to check for any damaged parts (resistors, diode) between the Gate of the MOSFET and the Gate drive pin of the IC.
                        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


                          #13
                          Re: BUSH 22" TV kEEPS BLOWING INTERNAL FUSE

                          Hi Guys did a couple of checks on the power board I'm going to replace the main filter cap as it's out of range and also ic1 and q1 q1 was shorted on source and drain i can't find anything else wrong checked all the smd caps and none is shorted how would I check the smd resistors. Thanks in Advance
                          Attached Files
                          Your never to old to learn

                          Comment

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