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EEVblog #1336 – DT71 LCR Tweezer Destructive Teardown + Lab Update

Destructive teardown o nthe Miniware DT71 LCR meter Tweezers Plus a lab move update. Forum: ...

8 comments

  1. Dave,

    The HD-PVR does not generate a reliable component output when there is no valid input. My monitor (Dell u2410) despises the output and sleep mode goes crazy when there’s no input to the PVR. I’d suggest trying a different component source.

  2. Dave,

    You announced this on Apr 1, . . . Right!!

  3. It could be the decoder chip – it has 4 ADCs in it, after all. One would be for the composite input (including tuner), the other three are the YUV/RGB inputs (component/VGA).

    Of course, with the dodgy YUV source, it’s hard to tell. However, one thing with VGA is it could be the VSync/HSync input is bad (component uses the green channel for embedded HSync/VSync – it’s like the normal NTSC/PAL/SECAM signal minus chroma information (chroma is R-G (red minus green differential signal) and B-G on the red and blue plugs, respectively) so hooking up just the green channel to composite will produce a black and white image).

    So perhaps get a proper component video source and see if the component works. If it does, then the most likely fault is the VGA HSync/VSync lines. They’re important as they tell the scaler what the input resolution is.

  4. You can use it with a Raspberry Pi board running its XBMC flavor and get a stunning media player!!

  5. Well,
    it was not the Blue Scren of Death 😉

    Suggestion : Affix in the dumpster local a paper asking

    1/ what was the fault
    2/ give you the remote !

    Bye
    Franck

  6. 1st, thanks for the site and the info.
    A few possibilities…
    There may be an input sensing IC that tells the decoder which signal is actually active.

    Often, you tell the TV from a menu setting which input you desire, if a signal is present, it will be switched into the signal path, if not present it cannot be selected and/or may not even be permitted to be displayed as a menu item (possibly greyed out)
    Is there a schematic available?

  7. PS…the blue screen is only used as a “filler” so you don’t see noise, that is, the regular circuit noise visible during channel switching, input selection, etc…

    It’s thought to be more “customer” appealing than looking at snow, noise, confetti, etc, etc,

    LJG

  8. Its like you read my mind! You appear to know so much about this, like you wrote the book in it or something.I think that you could do with some pics to drive the messagehome a little bit, but other than that, this is fantastic blog.A fantastic read. I’ll certainly be back.

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