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PIIX4E Package

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This package uses a secondary board , outlined in white square in the above pic. On the periphery, just about visible in that pic, of this square board there are traces , approximately 50 to a side. Not all have a corresponding dot pad. Underlying array is 20 x 20 , not all pinned, and excluding repeated grounds and power rails , maybe about 4x 50 active pins. If you remove the lacquer covering, do each of these peripheral traces , go to each active pin, hidden underneath? Is there a structure to the order of these linear traces to the subset of pin array row/col , corresponding to that edge ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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N_Cook
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Yes those peripheral cut traces do go inward, to the array, in a structured manner, but not yet determined whether a regular pattern repeated around all

4 sides.
Reply to
N_Cook

This is a 324 BGA , ball grid array, 324 solder balls

312 points come out to the periphery. 50 along each top edge and 28 on each underside edge. tends to be outer 3 rows to the top and inner 2 rows to the bottom. Safest to scratch away at the edge of this secondary pcb to expose the traces at the sides, scratching-in from top or bottom may scratch through a trace. Maybe just resin rather than glass reinforced board. The underside line-up is more regular, tending to be 2 traces between each grid ball. Upper edge is more erratic, the rings probably mean something , on some of the upper traces, but not decyphered

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

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