Sharp lc32sh20u rare problem

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  • fastvideo
    Senior Member
    • Dec 2008
    • 55

    #1

    Sharp lc32sh20u rare problem

    TV mode: no video,no sound.
    Input 1 (composite): have video, no sound.
    Input 2 (composite): no video, have sound.
    Input 3 (component): have video, no sound.
    Input 4 (hdmi): have both video and sound.


    Is this a really rare problem?
    Any help here?
  • PlainBill
    Badcaps Legend
    • Feb 2009
    • 7034
    • USA

    #2
    Re: Sharp lc32sh20u rare problem

    Originally posted by fastvideo
    TV mode: no video,no sound.
    Input 1 (composite): have video, no sound.
    Input 2 (composite): no video, have sound.
    Input 3 (component): have video, no sound.
    Input 4 (hdmi): have both video and sound.


    Is this a really rare problem?
    Any help here?
    Sounds like a problem with the IC that selects the input. Unless you can find a bad power voltage regulator on the board, it will probably require replacing the appropriate board. The service manual is available on elektrotanya.

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

    Comment

    • kc8adu
      Super Moderator
      • Nov 2003
      • 8829
      • U.S.A!

      #3
      Re: Sharp lc32sh20u rare problem

      yep a source switching problem.likely got zapped through the inputs.

      Comment

      • fastvideo
        Senior Member
        • Dec 2008
        • 55

        #4
        Re: Sharp lc32sh20u rare problem

        Thank you for the advise, will look into it later.
        I have the service manual.

        Flash memory is on scaler board if the tv has a corrupted firmware.
        Problem with the IC that selects the input is on AV board.
        This is very tough call to me, 50/50 chances of these two board.

        I have a feeling that may be the firmware was corrupted.
        If anyone have copy of this firmware please let me know, thank you.

        Comment

        • Wizard
          Badcaps Legend
          • Mar 2008
          • 2296

          #5
          Re: Sharp lc32sh20u rare problem

          Sounds more like corrupt firmware.

          If you get working input at all, that is not the chip. Especially if the chip got clobbered, IC tend to die totally and give nothing at all. And double especially on generic TVs, they tend to use all in one IC to keep cost down. Usually Mediatek. (Yuck).

          Cheers, Wizard

          Comment

          • fastvideo
            Senior Member
            • Dec 2008
            • 55

            #6
            Re: Sharp lc32sh20u rare problem

            If anyone have copy of this firmware please let me know, thank you.

            Comment

            • mbates14
              Senior Member
              • May 2005
              • 169

              #7
              Re: Sharp lc32sh20u rare problem

              and thats the thing you wont find. becuase i never have. unless the manufacturer has firmware updates on thier website.

              Comment

              • fastvideo
                Senior Member
                • Dec 2008
                • 55

                #8
                Re: Sharp lc32sh20u rare problem

                I think I am go for the scaler board.
                After looking at the service manual, look like IC801 AND PERIPHERAL CIRCUIT is problem.

                Comment

                • fastvideo
                  Senior Member
                  • Dec 2008
                  • 55

                  #9
                  Re: Sharp lc32sh20u rare problem

                  Got another scaler board installed, no luck.
                  Now I am looking for IC4201.

                  Comment

                  • fastvideo
                    Senior Member
                    • Dec 2008
                    • 55

                    #10
                    Re: Sharp lc32sh20u rare problem

                    Defective IC4201 confirmed.
                    Replace a new one, TV is working again.

                    Comment

                    • malicegreene
                      New Member
                      • Jan 2011
                      • 3

                      #11
                      Re: Sharp lc32sh20u rare problem

                      i had to register to this forum just to say i have this SAME problem ....

                      i'm going to take your advice and replace this "IC4201" piece ...

                      if this works .. thanks a million ...

                      Comment

                      • malicegreene
                        New Member
                        • Jan 2011
                        • 3

                        #12
                        Re: Sharp lc32sh20u rare problem

                        also ... where did u get the IC4201 piece ...?

                        and what kind of directions did u find to replace it ... ?

                        can i just pull off the back of the tv and match the pieces ... in order to see which on to replace ...

                        any help would be greatly appreciated ... thanx...
                        Last edited by malicegreene; 01-08-2011, 07:57 AM. Reason: had more questions ..

                        Comment

                        • fastvideo
                          Senior Member
                          • Dec 2008
                          • 55

                          #13
                          Re: Sharp lc32sh20u rare problem

                          Originally posted by malicegreene
                          also ... where did u get the IC4201 piece ...?

                          and what kind of directions did u find to replace it ... ?

                          can i just pull off the back of the tv and match the pieces ... in order to see which on to replace ...

                          any help would be greatly appreciated ... thanx...
                          IC4201 is a 36pin SMD type IC. I have to remove it with hot air and spent quite some time to put back the surrounding SMD components.

                          Warning:
                          This job is not recommend for newbies.
                          Replace the complete AV board is more safe and easy job.

                          Comment

                          • malicegreene
                            New Member
                            • Jan 2011
                            • 3

                            #14
                            Re: Sharp lc32sh20u rare problem

                            any recommendations where to get the board... ?

                            been trying google ...but nothing ....

                            Comment

                            • PlainBill
                              Badcaps Legend
                              • Feb 2009
                              • 7034
                              • USA

                              #15
                              Re: Sharp lc32sh20u rare problem

                              Originally posted by malicegreene
                              any recommendations where to get the board... ?

                              been trying google ...but nothing ....
                              Someone on eBay is selling a set of 6 boards.

                              PlainBill
                              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                              Comment

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