Sharp LC-70LE847U 3-1 blinks - troubleshooting

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  • haggisnbabgpipes
    New Member
    • Nov 2020
    • 2
    • Canada
    #1

    Sharp LC-70LE847U 3-1 blinks - troubleshooting

    Hi everyone! New to the board and I've gone through a bunch of other threads discussing the same thing however I can't seem to nail down the issue. Any help would be fantastic.

    -Screen doesn't turn on at all. During power up, the green light on the main board flashes once
    -I get the 3 slow blinks then 1 fast which should mean a comm issue
    -Tried the various resets (input/vol down plug in, hold power on then plug in etc). No image or K tries to come on.
    -No backlight comes on
    -Tried removing various T-Con ribbons, left only, right only, all of them, to see if I could get backlighting but nothing comes on.
    -checked voltage at the PSB regulator - during power up i get 13V at pin 1, 12v at pin 2, 3v at pin 4. This to me means the main board is telling the PSB to supply power correct?
    -checked voltage at pins 14 and 16 during power up and they are both producing 3v

    Any thoughts that could help me land on a certain board for replacement? I'm thinking it's not that panel as I can't hear any sound? I'm not sure if I even would though with this error code.

    Here's a link with pictures of the back of the TV including panels

    https://photos.app.goo.gl/cJzT3f2j4PLfAfmw9

    Thank you!

    Mike
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