Schematic??

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  • tibd
    Senior Member
    • Oct 2014
    • 189
    • Sweden
    #1

    Schematic??

    Dear members.

    I have a VEBA TFT color monitor with S/N RTD7 105748-p

    The device doesn't power on. Any schematic out there or advice. The first circuitry marked as LAV-561301 with bigger sized figure, beneath stand
    023A004 with a bit smaller sized figure.
    Tags: None
    • tibd
      Senior Member
      • Oct 2014
      • 189
      • Sweden
      #2
      Re: Schematic??

      Any help?

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8068
          • Canada
          #3
          Re: Schematic??

          Mhh... with that info I can't do much at all. Maybe upload some hi res pics and you may get better response from others. Also just saying "it doesn't power on" is very vague. Gotta be more specific than that. You got STBY voltage? LED on or what's happening there... Did you check fuses, diodes and Mosfets already?
          Last edited by CapLeaker; 03-16-2015, 10:19 AM.

            Comment

            • ben7
              Capaholic
              • Jan 2011
              • 4059
              • USA
              #4
              Re: Schematic??

              Check to see if the power supply is getting any signal to turn ON. If it is, check to see if it is outputting any voltage. Another possible issue could be the backlights aren't working, which could possibly make it seem like it won't power on.

              Also, have you checked the capacitors?

              P.S. pictures can help!
              Muh-soggy-knee

                Comment

                • tibd
                  Senior Member
                  • Oct 2014
                  • 189
                  • Sweden
                  #5
                  Re: Schematic??

                  Hello,
                  Sorry for not uploading pic before, I got a problem with my phone. Here are pics showing the device. At the mainboard pic I added some measurements. As for the Q11 its marked BC RB, I tried searching coding but didn't get anywhere.

                  The voltage at both Vin for the sharp IC are 0.3-1.5, the 0.3 at standby and 1.5 if I push the PAL/NTS button.

                  At CN3 I'm getting 11.95 v at standby. as for the switch board there is 5 v at the on/off button at the leg according to pic. Trying to turn on device nothing happens and the LED stays off. The only change I get is at U91 where the 5 v reaches but nothing else happens, the 5 v disappears from that pin U91 as I release the on/off button.

                  As for CN4 which leads to the inverter board beneath I only get voltages from 0.2- (2v with PAL/NTS trick).

                  Checked all the smd caps on mainboard, non is shortened to GND. Diodes were ok too.
                  Attached Files
                  Last edited by tibd; 03-16-2015, 01:42 PM.

                    Comment

                    • CapLeaker
                      Leaking Member
                      • Dec 2014
                      • 8068
                      • Canada
                      #6
                      Re: Schematic??

                      sounds like without a schematic we are screwed. Half of the chips I can't read anything off it. Did you try to unhook the inverter board? Maybe it drags something down?

                        Comment

                        • tibd
                          Senior Member
                          • Oct 2014
                          • 189
                          • Sweden
                          #7
                          Re: Schematic??

                          I thought that too. If it helps I'll try to take some other photos with a better focus!!

                          -The Q11 that is marked BC RB, any idea what it is?
                          -Same reading as the inverter cable detached.

                            Comment

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