SHARP LC-26SH12U service bulletin for fixing low sound problem

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #1

    SHARP LC-26SH12U service bulletin for fixing low sound problem

    Any one has any details on what is doen to fix the low sound level problem? Very common sound problem that was there from the factory.
    I cannot find what SHARP has doen to fix this problem. Firmware or hardware update? See attach PDF. Thanks.
    Attached Files
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: SHARP LC-26SH12U service bulletin for fixing low sound problem

    Is it present on everything, not just the digital output? My guess would be configuration - possibly EEPROM (hardware) or firmware settings.
    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

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: SHARP LC-26SH12U service bulletin for fixing low sound problem

      Low speaker level (I look at the analog audio level feeding the Linear stereo audio power amp , they are very low), low Digital audio output also. So many people have complaint abOut this low sound level. I know I can add a sigle transistor preamp (per channel) to the input to the power amp IC to solve the problem, but if it can easily be done some otherway per SHARP then I will do it their way. I do have a feeling it is firm ware update. I cannot find any firmware update at ELEKTROTANYA.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • crashp3
        Senior Member
        • Mar 2011
        • 81

        #4
        Re: SHARP LC-26SH12U service bulletin for fixing low sound problem

        Bud:

        I sent the service manual information to tom66 - there were (2) addendums to the service manaul that were created just after the TSB information you posted above.

        In the addendums, it states there were (2) part changes to the board:

        IC101 - OEC6088A (looks like a new mainbord... shared with Sansui
        IC2407 - HY27US08281A-TPCB ( NAND memory )

        The original parts (first service manual) list the same location and actually the same part information/description. Assuming this is a firmware update (especially since NAND flash indicated a change), unfortunately the Sharp service site and consumer site have no firmware updates available.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: SHARP LC-26SH12U service bulletin for fixing low sound problem

          Does the issue also affect the 32" or above models? Maybe firmware is shared...
          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

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: SHARP LC-26SH12U service bulletin for fixing low sound problem

            Thanks crashp3 for the info. I will add my own transistor preamp instead for the power amp section.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

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