Matsui M32LW409 no picture but sound

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  • Andyd1970
    Badcaps Veteran
    • Feb 2013
    • 374
    • united kingdom

    #1

    Matsui M32LW409 no picture but sound

    Hi Guys,

    I have just taken in a Matsui M32LW409, that has sound but no picture, I have switched it on in the dark and you can see the screen being illuminated.

    Any thoughts please
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Matsui M32LW409 no picture but sound

    Checked the T-con fuse?
    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

    • Andyd1970
      Badcaps Veteran
      • Feb 2013
      • 374
      • united kingdom

      #3
      Re: Matsui M32LW409 no picture but sound

      Hi had thought that but could not see anything obvious that was like a surface mounted fuse, I have noticed a components called FP1. Is that the fuse?

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Matsui M32LW409 no picture but sound

        How about some pictures of the boards and chassis layout?
        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

        • Andyd1970
          Badcaps Veteran
          • Feb 2013
          • 374
          • united kingdom

          #5
          Re: Matsui M32LW409 no picture but sound

          Hi Tom,

          See pictures, the TCON was behind a large metal frame that has the PSU and AV board.
          Attached Files

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Matsui M32LW409 no picture but sound

            Mmm, Vestel junk, I see.
            FP1 looks to be a fuse, I'd start there.
            Also, try checking DC volts both ends of fuse, with boards all connected.
            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

            • Andyd1970
              Badcaps Veteran
              • Feb 2013
              • 374
              • united kingdom

              #7
              Re: Matsui M32LW409 no picture but sound

              OK, FP1 is open circuit, I will check voltages. With TV's would is be OK to solder a link over FP1 to prove it or could that cause more damage?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Matsui M32LW409 no picture but sound

                Never jumper a fuse. You can buy the fuses from eBay or CPC, about Β£3.
                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

                • Andyd1970
                  Badcaps Veteran
                  • Feb 2013
                  • 374
                  • united kingdom

                  #9
                  Re: Matsui M32LW409 no picture but sound

                  Hi Tom,

                  With the set powered up I get no voltage reading on the left side of FP1 but on the right side I get around 100mv, I had black probe to the chassis.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Matsui M32LW409 no picture but sound

                    Is that on - i.e. with backlight and sound?
                    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

                    • Andyd1970
                      Badcaps Veteran
                      • Feb 2013
                      • 374
                      • united kingdom

                      #11
                      Re: Matsui M32LW409 no picture but sound

                      Hi Tom,

                      Back light is on and sound is being produced,, it is a slightly different reading

                      Left side of FP1 000.1mV and on right side of FP1 its around 60-90mV

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Matsui M32LW409 no picture but sound

                        Ok, see if you can find a 12V supply on the PSU, it should be on a pin on the power board to main board connector.
                        What is the part # of the main board? 17MB.....
                        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

                        • Andyd1970
                          Badcaps Veteran
                          • Feb 2013
                          • 374
                          • united kingdom

                          #13
                          Re: Matsui M32LW409 no picture but sound

                          Hi Tom,

                          Scrub all that I had not reconnected the ribbon cable from the Tcon to the main board ! OK so the following readings

                          FP1 right side 12.3v

                          FP1 left side 000.3mV

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Matsui M32LW409 no picture but sound

                            Ok, so try testing from each end (with TV power OFF) the resistance to the chassis ground, on the 2000 ohm range.
                            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

                            • Andyd1970
                              Badcaps Veteran
                              • Feb 2013
                              • 374
                              • united kingdom

                              #15
                              Re: Matsui M32LW409 no picture but sound

                              FP1 right side O/C

                              FP1 left side 000.5 Ohms, getting continuity beep from meter

                              Comment

                              • Th3_uN1Qu3
                                Believe in
                                • Jul 2010
                                • 6031
                                • Romania

                                #16
                                Re: Matsui M32LW409 no picture but sound

                                Something is hard shorted over there. Remove ceramic capacitors CP1 and CP3 and see if the short goes away.
                                Originally posted by PeteS in CA
                                Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                                A working TV? How boring!

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Matsui M32LW409 no picture but sound

                                  +1
                                  Also try CP30,CP31
                                  And test with panel ribbons removed (eliminate shorted panel possibility)
                                  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

                                  • Andyd1970
                                    Badcaps Veteran
                                    • Feb 2013
                                    • 374
                                    • united kingdom

                                    #18
                                    Re: Matsui M32LW409 no picture but sound

                                    Hi Guys,

                                    I have removed CP1 and CP3 and have O/C at each end of FP1 now.

                                    So do I take that I need to replace the two caps? How can i find out the value

                                    I still had the panel connected and everything else was connected. I did not try Tom's bits as thought best to try one thing at a time.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Matsui M32LW409 no picture but sound

                                      One of them is probably short. You can test each on a capacitance meter to be sure. (One use for such a meter! Don't use an ESR meter unless it will read out capacitance too.) One capacitor will give a sensible reading for capacitance, the other should not. They will almost certainly be the same value.

                                      The package format is 1210 and the voltage rating will be 16V or more. I would guess capacitance of around 10~33uF, but I would suggest testing them if possible.
                                      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

                                      • Th3_uN1Qu3
                                        Believe in
                                        • Jul 2010
                                        • 6031
                                        • Romania

                                        #20
                                        Re: Matsui M32LW409 no picture but sound

                                        Just replace them with ones of similar size. Capacity is not critical - in fact, if you replace the fuse now, the set will likely run just fine without those capacitors. Btw, one of them is likely still good - just use the continuity beeper of your multimeter to find the shorted one. Then you can put the good one back on.
                                        Originally posted by PeteS in CA
                                        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                                        A working TV? How boring!

                                        Comment

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