# HG changeset patch # User Michael Spacefalcon # Date 1385974538 0 # Node ID 023d55d76b28adb0874ad697162a30b65bb45a6f # Parent c20dedad87a01dd34c24b7aaf733e98592be3894 Pirelli PCB RE: another failed attempt at tracing the keypad connections diff -r c20dedad87a0 -r 023d55d76b28 pirelli/keypad --- a/pirelli/keypad Mon Dec 02 07:44:41 2013 +0000 +++ b/pirelli/keypad Mon Dec 02 08:55:38 2013 +0000 @@ -9,6 +9,14 @@ Geometric centre of the footprint is at (3923,456) in steve-m's L8 scan. +Pin 2: *guess* may be KBC0 + +Pin 3: L8 trace to (4068,278), L7 damaged, guessing the middle trace in the +bunch of 3 found when tracing KBC0. Inner via at (4084,491). Found it on L2, +goes to (4107,482). Goes to Calypso ball M5, or maybe N5. N5 seems unlikely, +as it's a power pin, so must be M5 - but that is KBC4, which shouldn't go to +the main keypad. + Pin 8: connected to massive copper flood, almost certainly GND. Pin 9: connected to a copper fill that's islanded by some traces, so it may or @@ -24,4 +32,11 @@ Tracing KBC0, Calypso ball N4: goes to via at (4122,380). Found it on L2, goes to a larger via at (4130,444). Found it on L7, trace disappears into the edge -grind-down damage. +grind-down damage. The trace disappearing into the damage is the leftmost in a +bunch of 3, the point at which the middle of the bunch is cut off is (4116,352). +A *guess* is that we may be going to connector pin 2. + +Let's try tracing some signals from Iota. Let's start with PWON (ball F8). +L1 trace from ball seems to go to (2767,974). On L2 it goes to two vias: +(2730,745) and (3312,194). Both vias are inner. Following (3312,194) first. +Unable to find it, edge damage gets in the way again.