Sharp LC-55UB30U giving me brain damage

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  • brucetv
    Badcaps Veteran
    • May 2015
    • 281
    • united states

    #1

    Sharp LC-55UB30U giving me brain damage

    I have this Sharp LC-55UB30U in the shop and it doesn't want to Power up, show a stand by light, no backlights, no sound but all my normal voltages seem to be present.
    Power Supply part # 0500--0605-0910
    Main Video Board # 3655-1112-0150
    T-Con LJ94-32662F

    Power Supply
    CN102
    Pin 1-3 5v stby 5.246 5.24
    Pin 4-6 12v 12.25 12.25
    RMT On 4.938 4.93
    BL On/off 0.110
    Dimming 0.399 power on 0.387
    Dimming 0.399 0.386

    Main
    U32 in 5.2 out 3.26 adj 2.06
    U27 in 3.4 out 1.82 adj 0.58<-----adj too low?
    U17 pin 1 12.24v
    U20 pin 1 1.513v
    Tcon Fuse both sides off 0.495v on 0.525v

    Tv standby light does not light up at plug in and no optical led on at power up, just dead. I couldn't find the same Main Video Board but Encompass said they had a sub so I ordered it and it looked identical and fired the Tv right up...except for one BIG problem...the picture was upside down and there was no way to get into the service menu trying 3-4 methods so we determined the Main was the wrong version as this Tv is very version specific. The picture looked great, but nothing in the menu or remote to flip the picture like some Sharp's I've seen. Do you think that U27 Volt Reg adj is too low and maybe suspect? Marking look like reverse C 11 5NC 1117. Can't seem to find the same one in digikey or mouser. Anybody have any suggestions?
    Attached Files
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9514
    • Canada

    #2
    Re: Sharp LC-55UB30U giving me brain damage

    LM1117 https://cdn.badcaps-static.com/pdfs/...bb102c88cc.pdf Digikey has them

    Comment

    • brucetv
      Badcaps Veteran
      • May 2015
      • 281
      • united states

      #3
      Re: Sharp LC-55UB30U giving me brain damage

      Thanks RJ...I've got some of these in the box...do you think they will work? Thanks for the part #....my poor eyes are worn out
      https://www.digikey.com/products/en?...ST33T3GOSCT-ND

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Sharp LC-55UB30U giving me brain damage

        U27 in 3.4 out 1.82 adj 0.58<-----adj too low?
        Vref 1.25 + Vadjust = Vout
        So 1.25Vref + 0.58Vadj = Vout 1.83V
        So there is nothing wrong with U27.
        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

        • attainteddragon
          Badcaps Veteran
          • Apr 2013
          • 764
          • australia

          #5
          Re: Sharp LC-55UB30U giving me brain damage

          1.8v is a common logic voltage, so i would not view it as suspect from that point of view either.
          WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

          Comment

          • dskall
            Badcaps Legend
            • Oct 2016
            • 2905
            • usa

            #6
            Re: Sharp LC-55UB30U giving me brain damage

            BL_ON .110v ?
            I assume no responsibility for any stupid suggestions I might post.

            Comment

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