Jeroni Paul wrote in message
...
N_Cook wrote:
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


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 filetypedf 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 ?