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LG 37LC2D Major S/C Testing F9223L

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    LG 37LC2D Major S/C Testing F9223L

    hi

    Was going to post in the other 37LC2D post but that one semed more related to the very common LG cap failure

    Anyway, got this tv and found the Bridge S/C cant see anything else on board and wondered if anyone can give me a pointer on how to test the 13 legged I/C , I have already removed it from the board


    Thanks in advance

    #2
    Re: LG 37LC2D Major S/C Testing F9223L

    What's the part # of the device?
    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.

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      #3
      Re: LG 37LC2D Major S/C Testing F9223L

      Originally posted by tom66 View Post
      What's the part # of the device?
      Sorry Tom, I only put the part number in the title F9223L (Datasheet attached)
      Attached Files

      Comment


        #4
        Re: LG 37LC2D Major S/C Testing F9223L

        Test for shorts (both ways):
        23 to 20
        23 to 19
        19 to 4
        7 to 8

        Any short circuit indicates a fault.
        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


          #5
          Re: LG 37LC2D Major S/C Testing F9223L

          Cheers Tom...23-20 23-19 s/c'd

          Going to order one now

          Comment


            #6
            Re: LG 37LC2D Major S/C Testing F9223L

            If that internal FET failed short inside the device, you may also need to test external devices. I don't know how it is connected because the second fet seems to be floating -- for external use. Not sure why.
            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


              #7
              Re: LG 37LC2D Major S/C Testing F9223L

              The only other thing I can see was the bridge, If I remember rightly they normally take a couple of the small smd caps and resistors on the underside, but these seem to be ok, I found another old board with the part in thats fine so going to pop it in later

              Will let you know how it goes

              Comment


                #8
                Re: LG 37LC2D Major S/C Testing F9223L

                Hi

                Fixed with a different fault

                replaced the Bridge/F9223L and recapped the secondary side, the problem I am having is with the sound and digital tv. The speakers keep crackling and when you try and tune in Digital channels it refuses to start, I could get round this by doing a factory reset so it searches for analogue then digital but its not jumping to channel 21 or even trying to search for digital.

                I have another TV that is fully working, as soon as I put the psu int the working tv I get the same problems...so I know it has to be something on the psu

                Any help appeciiated
                Last edited by signup; 05-10-2013, 04:35 AM.

                Comment


                  #9
                  Re: LG 37LC2D Major S/C Testing F9223L

                  Sorry should of added my 3.4 line is down at 1.83v

                  Comment


                    #10
                    Re: LG 37LC2D Major S/C Testing F9223L

                    If your 3.4V is low, you will get those problems.
                    The controller IC on 3.4V is failed or the capacitors around it are bad.
                    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


                      #11
                      Re: LG 37LC2D Major S/C Testing F9223L

                      Cheers Tom

                      I have changed the two fets and regulator on the underide of the board but still the same.

                      Any other pointers

                      Comment


                        #12
                        Re: LG 37LC2D Major S/C Testing F9223L

                        Did you change the ones for the 6V or 3.4V?
                        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


                          #13
                          Re: LG 37LC2D Major S/C Testing F9223L

                          3.4 as shown in budm diagram on the other post..I will just go an check the 6v line now

                          Comment


                            #14
                            Re: LG 37LC2D Major S/C Testing F9223L

                            I am getting 6.1v

                            Comment


                              #15
                              Re: LG 37LC2D Major S/C Testing F9223L

                              Check what 3.4V rises to when you disconnect the main board connector -without- the POWER ON signals (PSON, BLON etc.)
                              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


                                #16
                                Re: LG 37LC2D Major S/C Testing F9223L

                                I have just been looking throough the other thread regarding this tv and there is a little contradiction Budm shows a picture of 3.4 buck and fets but then later in the post you say this is the 6v line and the 3.4 volts is to the left of the board...bit confussed now

                                Is the 3.4 v line by the inverter plugs or is that the 6v line...I think I have replaced all the 6v fets and ic

                                Comment


                                  #17
                                  Re: LG 37LC2D Major S/C Testing F9223L

                                  Budm Put

                                  https://www.badcaps.net/forum/showth...t=18218&page=5 post number 81

                                  You put
                                  https://www.badcaps.net/forum/showth...t=18218&page=6 Post 103

                                  Comment


                                    #18
                                    Re: LG 37LC2D Major S/C Testing F9223L

                                    You can trace it through the inductor and capacitors and find the 3.4V one. I no longer have this TV or board in my possession.
                                    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


                                      #19
                                      Re: LG 37LC2D Major S/C Testing F9223L

                                      I have uploaded the two pics, on your pic you say the 3.4 is to the left but budm says his pic is the 3.4v ic and fets which is the one on the right of your pic...confused...I am too.
                                      Attached Files

                                      Comment


                                        #20
                                        Re: LG 37LC2D Major S/C Testing F9223L

                                        In the middle/right of the first pic.
                                        Budm's left is different to your left?
                                        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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