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comparison pirelli/audio @ 55:037c9bea954c

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Pirelli PCB: traced the earpiece and loudspeaker analog signals
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 02 Aug 2013 02:16:31 +0000
parents
children fdfb57a1c5fe
comparison
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54:8e4dac492552 55:037c9bea954c
1 Tracing EARN & EARP outputs from Iota. On L1 they go to vias at (2422,518) and
2 (2449,518). On L2 they go to vias at (2455,322) and (2492,323). Tracing made
3 difficult by flaws in steve-m's grind-down process, but they appear to go to L4,
4 where they then seem to go to other vias at (491,1254) and (490,1292). Found
5 them on L7: going to immediately adjacent micro-vias at (514,1255) and
6 (514,1295). On L8 they go to the earpiece speaker.
7
8 Tracing the loudspeaker signal path starting with the physical speaker connector
9 on L1. The connector part center is about (1930,212). The connector footprint
10 on L1 is damaged by steve-m's grind-down process (almost gone), but there seem
11 to be micro-vias at (1756,251) and (2005,237). On L2 they go to (1788,231) and
12 (2021,264). On L7 they go to micro-vias at (1784,262) and (1992,252). On L8
13 they go by some caps and then back to new micro-vias! The latter are at
14 (1902,220) and (1903,259). On L7 the grind-down damage gets in the way again,
15 but they appear to go to vias at (1935,218) and (1934,260). Found them on L3:
16 going to new vias at (3703,311) and (3739,313). (It might actually be L4.)
17 Found them on L7: fat traces to micro-vias at (3870,934) and (3898,869).
18 Finally on L8 they go to the Winbond chip! The speaker connection pins appear
19 to be the two leftmost ones in the top row of 9 pins.