Sony SDM-HS74

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  • timarlop
    Member
    • Apr 2009
    • 40
    • Portugal dos Pequenitos

    #1

    Sony SDM-HS74

    Anyone have experience or help troubleshooting this 6 years old -Freecycled- 17" Sony SDM-HS74 LCD ?

    At first, when powered on, the symptons were: green power led on, raster with osd but only for 5 sec. or so, then shut off and led turns amber.

    Now, as you can see here, when powered on, this info

    is displayed and the green power led stays on continuous.

    The board is LG 6871TPT285A model PWI7LS285A rev.A

    The caps are: Rubycon long life high ripple YXG

    c202 470uF 25V
    c203 470uF 25V
    c205 1000uF 16V
    c315 470uF 25V
    c333 470uF 25V

    sorry, don't have a esr meter

    I found this http://sci.tech-archive.net/Archive/.../msg00036.html and I've the service manual.

    tested power/inverter board conector pins with a dt9205b multimeter:
    13.78V at +13V
    4.95V at +5V

    could it be the microcontroller board ?
    Attached Files
  • FIXITNOW
    Senior Member
    • Jun 2008
    • 128
    • UK

    #2
    Re: Sony SDM-HS74

    TIP FROM HS73 MODEL
    intermittent problem. Sometimes it will power up and work just fine but other times you can't get any thing to display unless you unplug the vga cable and then the it will display no input. If you plug a vga cable into it at this point most of the time the picture will just go blank.
    REPLACED
    Cap C207's ESR has gone high
    Last edited by FIXITNOW; 10-10-2009, 01:07 AM. Reason: MORE INFO

    Comment

    • timarlop
      Member
      • Apr 2009
      • 40
      • Portugal dos Pequenitos

      #3
      Re: Sony SDM-HS74

      How did you removed your BACK COVER ASSEMBLY ? (my model is black part: 3809TKL085C)

      I broke, what seems to be, a clip at the top middle of my cover to completely remove it.


      The MST9131B LCD Controller (U201) POWER PINs
      VDDP(3.3V)and VDDC(2.5V) are all low (1V).

      Noticed small solder balls in the mainboard left side , could also have dry solder joints?!
      The electrolytic caps are: RJ4 ELNA 16V 100UF

      Comment

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