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Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

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    #21
    Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

    Originally posted by retiredcaps View Post
    Take this diode and retest it out of circuit.
    Tests good with dmm and with load.

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      #22
      Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

      Originally posted by walking View Post
      Tests good with dmm and with load.
      What are the readings?
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        #23
        Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

        Originally posted by retiredcaps View Post
        What are the readings?
        .335
        L

        I put a new one in its place. One from NTE. 89 cents only.

        There are several smd diodes on the foil side of this board at and near the ICs tested. All but one test L and .5XX-.6XX. One tests .524 & 1.89 (D1692 red arrow picture). On the component side of the board there are more and they all test out .5xx & L.

        http://www.datasheetarchive.com/1SS3...datasheet.html

        I guess I should pull that smd and check it off board? Looking this weekend for some junk board to practice on removing and soldering smds. Looks kinda ez on youtube.

        I read these can be tested on board but I can't find anything about if there is a short will it cause the later smd diode to give that kind of a reading, as in current going around it?, or if that diode is the bad shorted component. I'm guessing/hoping the later.
        Attached Files

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          #24
          Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

          looking at front panel screen is it just "white" background with no video when turn on?
          Ron Driver,BSEE,CET,ISCET,NESDA

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            #25
            Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

            Originally posted by walking View Post
            One tests .524 & 1.89 (D1692 red arrow picture).
            I never seen a multimeter just display "L" for out of range. The most common is "0L" and if you have a radioshack model, it might be "0F". Getting these things correct is important because we cannot see what you are reading.

            D1692 is good. Depending on your multimeter, some of them don't display "0L" until the voltage is > 2V or 3V. 1.89 is "close enough" to 0L.
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              #26
              Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

              Originally posted by retiredcaps View Post
              I never seen a multimeter just display "L" for out of range. The most common is "0L" and if you have a radioshack model, it might be "0F". Getting these things correct is important because we cannot see what you are reading.

              D1692 is good. Depending on your multimeter, some of them don't display "0L" until the voltage is > 2V or 3V. 1.89 is "close enough" to 0L.
              Opps, sorry.

              It displays 'l' , I just assumed it was an 'L' and didn't want 'l' to be mistaken for '1'.

              If D1692 is good then I'm back at square one with the possibly shorted @ shottky diode

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                #27
                Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

                I have been searching for this service manual. Any chance you could send it to me? It would be extremely helpful right now.
                Thank you



                Originally posted by walking View Post
                [COLOR="Blue"]D1691 - Out of circuit.

                Oh, and someone sent me a Service Manual for this unit I just don't know if I can upload it here and not get in trouble.

                thanks.

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                  #28
                  Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

                  i have the same issue with this same exact tv. i dont have any idea what the voltages are suppose to be from the power board. any ideas. i pulled those 2 820uF capacitors because mine were also a little bulged and they are about 50uF - 100uF too low. not sure if that's a big deal though. also i have checked all of the diodes and they seem to be ok.

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                    #29
                    Re: Sanyo DP26746 LCD TV-sound,no picture,lamps are on.

                    So everyone knows, I found the manual : Sanyo_DP26746

                    I have half of my screen looks white with horizontal lines and the other is completely dark black. I'm going to be working on it today. -M.C.

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