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    Hanspree HSG1075

    brothers, what you see in the picture is a dismantled hanspree hsg1075 28inch lcd monitor. As you can see I have removed all covers on the back. This monitor only displays white when powered on, sound works perfectly fine. No splash logo displays, just bright white. Any direction on which board is bad and needs replaced? Somewhat proficient PC tech here (not TV). No apparent damage to any boards, no loose connections.
    Attached Files

    #2
    Re: Hanspree HSG1075

    It could have just been a loose ribbon cable going from the main board to the panel. Did you try re-seating it to see if it gets a picture?

    Comment


      #3
      Re: Hanspree HSG1075

      I can remove the black tape covering the ribbon cable connectors and try that, I haven't yet. Thank you, I'll post again once I test that!

      Comment


        #4
        Re: Hanspree HSG1075

        Ok, I removed the black tape that was covering the ribbon cable connectors between the large green board with video inputs and the small green board (tcon I believe), unfortunately after re-connecting the ribbon cable the white screen still occurs.

        Comment


          #5
          Re: Hanspree HSG1075

          At the bottom of the [picture there is a metal plate over the Tcon.
          Can you post a really clear picture of the Tcon board.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment


            #6
            Re: Hanspree HSG1075

            i hope this is what you mean. There is a thin plastic shield over the board that I didn't tear off, I can, if you can't see the board clear enough.
            Attached Files

            Comment


              #7
              Re: Hanspree HSG1075

              Yes, that is the T-con board.

              There is a device marked "M" and nearby "F100". This is the fuse. Measure the voltage on both ends of the device, relative to the chassis.
              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


                #8
                Re: Hanspree HSG1075

                Just want to ask really quick, since I'm not as savy with TV's you mean using the voltage meter, positive on one side of the fuse, negative on the other? while the TV is unplugged correct? I don't want to get zapped

                Comment


                  #9
                  Re: Hanspree HSG1075

                  You need to check the voltage on the fuse with the TV POWER ON (hit the power switch), black on the metal chassis, red probe on each end of the fuse at a time.
                  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: Hanspree HSG1075

                    the search for the voltage meter continues, I have not abandoned the cause!

                    Comment


                      #11
                      Re: Hanspree HSG1075

                      Voltage meter FOUND!
                      So, one final noob question, on this radioshack special voltage meter, (see attached) which setting is appropriate for this very tiny fuse? I am pretty cautious, maybe overly so with electricity I don't understand lol
                      Attached Files

                      Comment


                        #12
                        Re: Hanspree HSG1075

                        DCV 20V.

                        You are measuring the low voltage side. Shocks are not possible at the low voltages the t-con and video processor uses. The highest voltage on the t-con is 30V DC. The SELV level (safety extra-low voltage) specification is 60V DC. I have a 35V DC power supply. I can touch the output (and regularly do) with sweaty or dry hands and am not electrocuted yet.

                        However, do not touch any of the heatsinks (metal plates) on the power supply, as they can easily give a very nasty shock.
                        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: Hanspree HSG1075

                          with the negative tester on the metal chassis, and touching the red tester to each side of the fuse marked F100 (M) I saw no change on my voltage meter. 0.00 each and every time

                          Comment


                            #14
                            Re: Hanspree HSG1075

                            OK, just to be sure, can you find a fresh 1.5V battery and test that? It should show around 1.55~1.6V if good. Just to check if meter is 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


                              #15
                              Re: Hanspree HSG1075

                              update: my mistake, tv was plugged in NOT ON, now with the TV powered ON, i do see slight number changes on each side of the fuse, very slight, and still sometimes zero

                              Comment


                                #16
                                Re: Hanspree HSG1075

                                battery test yielded 1.47 on the meter

                                Comment


                                  #17
                                  Re: Hanspree HSG1075

                                  OK, must be slightly discharged but that is fine.
                                  So some how power is not getting to the T-con.

                                  Can we have a closer image around the connector which goes to the T-con but on the main board 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


                                    #18
                                    Re: Hanspree HSG1075

                                    here is the tcon connection on the "big board" side
                                    Attached Files

                                    Comment


                                      #19
                                      Re: Hanspree HSG1075

                                      In the picture it looks like the connector isn't plugged in all the way, that just happened when I pulled the tape, I pushed it back in and retested just to be sure. Still 0.00 mainly on the fuse

                                      Comment


                                        #20
                                        Re: Hanspree HSG1075

                                        In this picture,
                                        https://www.badcaps.net/forum/attach...0&d=1356560428

                                        Do you see the grey device marked 4R7?

                                        Can you test the output voltage here relative to the chassis of the TV?

                                        Also, let's make sure the chassis test is good; I just have a feeling. Set your meter to 200 ohms. Probe from the metal shield of the connector on the main board to the chassis of the TV -- you should see under 3 ohms.
                                        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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