FreeCalypso > hg > freecalypso-reveng

annotate pirelli/spca @ 54:8e4dac492552

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another Pirelli PCB tracing session, focusing on the display subsystem
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 28 Jul 2013 21:38:07 +0000
parents
children
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54
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 Tracing signal from Calypso A1 (address line 1, ball F2); expecting to see it go
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 to ball H8 on SPCA552E. On L1 the trace goes to (4326,756). On L2 I see it
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 branching - d'oh, it's address line A1, of course it will go to a ton of things!
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 Looking for another signal to trace that would be point-to-point from Calypso
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5 to SPCA552E.
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7 Let's try tracing the bypass GPIO signal, presumably originating from GPIO 7 on
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 the Calypso. That's Calypso ball N2. L1 goes to (4259,467). L2 takes it to an
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9 inner via at (4290,471). Found it on L5: goes to another inner via at
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 (4370,1835). Found it on L7: goes to (4270,2026). On L8 it arrives at an SPCA
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
11 ball which we are going to assume is A8 (bypass input according to the Nokia
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 schematic).
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
14 Deduced SPCA552E BGA orientation in steve-m's L8 picture: A1 in the LL corner,
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
15 row A along the bottom.
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
16
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
17 Accessible surface test points around the SPCA:
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
18
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
19 * Along the bottom (the side toward the red and # keys) we have TPs for A8
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
20 (bypass input) and C7 (Rxd1). The TP in between these two seems to be connected
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
21 through some inner layer, haven't traced yet. The L8 coordinates of this TP are
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
22 (4221,2119). The hole seems to be slanted to (4228,2112) though.
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
23 On L7 it goes to a large-looking via at (4196,1966).
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
24
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
25 * On the side toward the antenna we have TPs for C2 (LcmCs) and D3 (LcmWr).
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
26
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
27 * On the side toward the USB port we have TPs for J8 (Txd1) and H9 (HstRd_n).
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
28
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
29 * On the side toward the green and * keys we have TPs for G4 (Suspend),
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
30 H5 (Trap), and J7 (LcmVs).
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
31
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
32 The L8 trace from ball H6 (LcmMck) goes in two directions, terminating at via
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
33 points (4066,1704) and (4270,1251). On L7 the leg from (4066,1704) goes to
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
34 (3722,1700), looks like a micro-via back to L8.
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
35
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
36 Tracing Calypso PWL signal, starting with Calypso ball L7. On L1 the trace from
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
37 ball L7 appears to go to (3988,528); the trace from ball K7 (PWT/BU, no other
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
38 functions listed in CAL000) goes to (4041,813).
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
39
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
40 Tracing the mysterious PWT/BU first. On L2 the trace from (4041,813) goes to
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
41 (4211,1018), seems to be a micro-via back to L1. On L1 it goes to some strange
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
42 component pad at (4300,1186). The component seems to be a resistor; the other
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
43 side connection is unclear.
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
44
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
45 Back to PWL. On L2 the trace from (3988,528) goes to a larger via at
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
46 (4010,554). Found in on L7: goes to a micro-via to L8 at (3975,478). On L8 it
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
47 goes to another via back to L7 at (3784,664). On L7 it goes to a larger via at
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
48 (3635,839). Found it on L5: goes to another via at (3512,1808). Found it on
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
49 L7: goes to a micro-via to L8 at (3459,1756). There it appears to connect to
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
50 the mysterious A3-90E component through some resistors.