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Dear Sirs, I have a Sharp Aquos LC-42A83M bought in 2007 with little use (average less than 3 hours a day). All of a sudden, all inputs into composite Video and/or Componnt Video, can not be seen, I only get Audio. All HDMI inputs work fine. I use composite Video Inputs for my Cable TV which can not be seen but, if I press P&P while trying to watch TV, I get to see TV signal in half of the screen while in the other half, I only see signal if it comes from HDMI, do not se anything if that other signal comes from composite or component video. All equipments and games consoles work fine in my other TV. Equipment normally connected to my Aquos are DVD players Sony + Panasonic + Pioneer and Nintendo Wii or Game Cube. I love my Aquis an hope you can help me fix it. Thank you very much. Jose Lacruz

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  • lacruz1 Sep 10, 2010

    Thank you for initial comment but, if Logic Processor has failed, how it is possible to see HDMI signal properly? Alo, the analog signals from Cable TV box, can be seen when I use P&P... how about firmware upgrade/repair? how ould Procesor fail with such a care I tak with my TV and a minimum usage? what could hve caused such a failre? THANK YOU !!

  • lacruz1 Sep 10, 2010

    Thank you Azrael!

    So you are sure that the Logic Processor is the one that failed even though I can still get my TV siganl through Composite when I press the P&P button?



    Justa final question, is it possibl that the fmale connector in one of the compisite inputs is loose or short circuited ad causing this problem?



    I bought my TV in Indonesia in 2007 and I'm now in Mexico... I hope I can find some Sahrp inMexico who could order this part. Do you have any idea as to how much would this processor cost?



    Thank you for your help



    Jose

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The control processor has failed and since its soldered on the logic board that must be replaced in its entirety. Unfortunately,  since this tv is sold only in Asia, it will be very difficult finding parts for it outside of the official dealer. Best is to take your tv to one, they will be able to order the part directly to Sharp.

Posted on Sep 10, 2010

  • Azrael SRL Sep 10, 2010

    The logic controller is used only to control what signal is used and how, not how the signal is processed - this is done by the image processor and the analogue selection circuits that are still perfectly functional.



     Yes, a firmware upgrade might help (maybe the processor is fine, it's just the firmware that was corrupted somehow - very unlikely but possible), but one isn't available at their support section. If there is one then it's not public and it can be obtained only from a dealer. Again, a visit there is mandatory.
    Why the processor failed? Because the manufacturing of the electronic chips isn't perfect and parts still fail while in use. Just ask the ones that have or repair computers how many times they got failed (out of the blue) parts?  How you took care of it has no importance, your processor had a manufacturing weak spot that destroyed it in the end.

  • Azrael SRL Sep 10, 2010

    Yes, the other parts are functioning well.



    No, otherwise you wouldn't be able to see the signal at all. But nothing stops you to open the tv and take a look for your peace of mind.
    The average logic board costs around $150. But your tv has never been imported in Mexico so they will gonna have to make a special command for it so the price will be around $200. Because of that  they might not want to just sell it unless you gave the tv to them for fixing - add another $100 (at least) for that.

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