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Ellusive microcontroller

Discussion in 'Electronic Repair' started by N_Cook, Jun 19, 2013.

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  1. N_Cook

    N_Cook Guest

    I'm trying to locate the overall system controller on a video board, that
    handles IR remote, physical keypad functions and power on/off of main power
    supply etc. Mulilayer board of course but all I can find is dedicated
    digital video processing chippery. This is quite a thick pcb , does anyone
    hide SMD controllers recessed within the thickness of a pcb? there is a
    mysterious black piece of plastic in one area , well bonded to the pcb but
    no outline of anything underlying it
     
  2. N_Cook

    N_Cook Guest

    I warmed up and lifted that patch and nothing hiding underneath. I've
    managed to identify, surprisingly, all chippery , all 29 SMD devices with 8
    or more pins and all are dedicated video /audio/MUX/memory /op-amp packs
    etc, with pinouts etc avaialble for all , but no uC or PIC found for system
    control
     
  3. Jeroni Paul

    Jeroni Paul Guest


    It could be integrated in the video processor, it is in most digital decoders for TV.
     
  4. N_Cook

    N_Cook Guest

    handles IR remote, physical keypad functions and power on/off of main power
    supply etc. Mulilayer board of course but all I can find is dedicated
    digital video processing chippery. This is quite a thick pcb , does anyone
    hide SMD controllers recessed within the thickness of a pcb? there is a
    mysterious black piece of plastic in one area , well bonded to the pcb but
    no outline of anything underlying it


    It could be integrated in the video processor, it is in most digital
    decoders for TV.

    +++++
    And so it was. Although no schema for this unit , googling on the 2 main
    "video " processor chips and filetype:pdf threw up a few detailed
    schematics, to then targetted probe under the big BGA, to check traces.
    Is there a special probe for doing this, thin , tough, insulated , with
    graduations for indicating which row/column depth from the edge ?
     
  5. Jeroni Paul

    Jeroni Paul Guest


    I do not know, but it comes to mind you could use enamelled wire with the insulation removed on a small area at one end. Drawing a small scale on the wire may be the hardest part but if you are interested in just a few pins that reduces the number of marks to place.
     
  6. N_Cook

    N_Cook Guest

    graduations for indicating which row/column depth from the edge ?


    I do not know, but it comes to mind you could use enamelled wire with the
    insulation removed on a small area at one end. Drawing a small scale on the
    wire may be the hardest part but if you are interested in just a few pins
    that reduces the number of marks to place.


    +++++
    I have some .08mm tungsten wire that is just about stiff enough as a probe ,
    for this Ti ADP2000 BGA could have been larger diameter, laquered over and
    just the end ground down clean. A refinement I suppose would be contrasted
    markings along the laquer for row/column spacings, I think up to 5 deep in
    some areas of these
     
  7. N_Cook

    N_Cook Guest

    DDP2000, should have been , too much sun today
     
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