Kiowa LED39F3300-T-CON V390HJ1-PO1 failure

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  • yassinos
    Member
    • May 2020
    • 10
    • ALGERIA
    #1

    Kiowa LED39F3300-T-CON V390HJ1-PO1 failure

    Model: Kiowa LED39F3300

    Motherboard: MS82S (40-MS82S0-MAD2XG)

    Microprocessor: MST6E182VS-LF

    Power Supply: 40-E371C4-PWG1XG (PE371C4)

    T-CON: V390HJ1-XC01

    This is my first participation and I apologize for the language as I am not very fluent in English.

    Backlight + Sound (OK) but no picture (see pictures)

    The measurements I made on the T-CON are as follows:

    VGL=-7.98V / VGH=26.8V / VGHP=31.00V / VREF=17.00V / V12V=11.86V / VD33V=3.27V / V33V12=3.27V / VDD=3.27V /

    S_PWRON=3.25V / PWR_ON=3.25V / XAO=3.26V / GVOFF=2.27V / V1V2=1.19V / POL=1.18V / VCM_CF=VCM_TFT=7.80V /

    VAA=17.66V / CKV=1.82V / STV=0.01V / VCOMS=7.80V

    But VAAM=0.11V (normally 9V) and HVAA_IN=0V (normally 9V)

    I also found the series of capacitors CD4x (CD41-42...CD50) on both sides of the T-CON shorted.

    I have doubts about the UH1 (marked 1577 =G1577_Operational Amplifier) because I find CH1 & CH5 shorted but when I remove RH1, the short disappears.

    Please help me with a schematic of this T-CON or at least the source of the 2 voltages HVAA_IN & VAAM

    Maybe it's the board that is defective?


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    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12206
      • U.S.
      #2
      So do you have 1 ohm value on RH1 when removed? Does seem like UH1 is the problem. See if you can grab a datasheet for it.
      Last edited by nomoresonys; 03-12-2025, 09:58 AM.
      Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.

        Comment

        • yassinos
          Member
          • May 2020
          • 10
          • ALGERIA
          #3
          Dear nomoresonys !
          Yes, I have 1 ohm value on RH1 when removed.
          Thanks for your advice.
          The UH1 (G1577) datasheet is incomplete. It's a low power operational amplifier.
          I'm looking for the source of the two voltages, VAAM and HVAA.
          The CM501 Shifter IC is OK.
          My friendly greetings
          https://www.mediafire.com/file/th0gv...G1577.pdf/file

            Comment

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