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annotate pirelli/keypad @ 61:2bc45eb8818d

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Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 01 Dec 2013 23:59:56 +0000
parents
children 023d55d76b28
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
61
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 Seeking to understand the 16-pin interface between the main PCBA and the keypad.
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 Both connectors (the one on the main PCBA and the one on the underside of the
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 keypad) have silkscreen with pin numbers around them, but the numbers in these
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 silkscreen labels don't match: per the main PCB silkscreen, pin 1 is toward the
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5 edge of the phone, whereas per the keypad underside silkscreen, pin 1 is toward
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6 the middle.
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 Here I will use pin numbers per the main PCBA silkscreen.
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 Geometric centre of the footprint is at (3923,456) in steve-m's L8 scan.
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
11
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 Pin 8: connected to massive copper flood, almost certainly GND.
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
14 Pin 9: connected to a copper fill that's islanded by some traces, so it may or
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
15 may not connect the same massive fill (GND?) as pin 8. In this island there is
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
16 a largish solid-connect via at (3915,475) and two smaller ones at (3766,539)
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
17 and (3911,507). On L7 these vias connect to massive copper flood - definitely
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
18 GND.
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
19
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
20 The keymap given in OsmocomBB (confirmed to be correct) indicates that the main
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
21 keypad ought to use KBC0 through KBC3 and all 5 KBR lines. The 3 side buttons
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
22 use KBC4 and KBR1 through KBR3. Let's try tracing the KBC and KBR lines of
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
23 interest from the Calypso.
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
24
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
25 Tracing KBC0, Calypso ball N4: goes to via at (4122,380). Found it on L2, goes
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
26 to a larger via at (4130,444). Found it on L7, trace disappears into the edge
2bc45eb8818d Pirelli PCB RE: attempt to trace out KBC/KBR lines stopped by grind-down damage
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
27 grind-down damage.