A5/A6 rework capacitor location
joerg at openmoko.org
Thu Dec 18 13:18:05 CET 2008
Am Do 18. Dezember 2008 schrieb Al Johnson:
> I'm moving this one to the hardware list since the topic is now more suited.
> On Thursday 18 December 2008, Joel Newkirk wrote:
> > On Wed, 17 Dec 2008 17:00:34 +0000, Al Johnson
> > <openmoko at mazikeen.demon.co.uk> wrote:
> > > On Wednesday 17 December 2008, Joel Newkirk wrote:
> > >> I don't know what the physical
> > >> difference is for the power tweak. (V6 can power up from wall power
> > >
> > > without
> > >
> > >> battery)
> > >
> > > It's a bigger C1767 - according to the schematics it's 4.7uF on A5, 47uF
> > > on A6
> > > and 100uF on A7. Werner's writeup of the investigations is here:
> > >
> > > http://people.openmoko.org/werner/gta02-chg/
> > Thanks - that was most of what I was needing. Unfortunately it doesn't
> > identify the real estate occupied by C1767 there, nor in the component
> > placement diagrams.
> > Can someone point me at the right spot on the board? If it's got enough
> > room for the same 3528 cap we're looking at for the big-C rework (which I
> > doubt, though it looks like it will fit for the big-C position) that would
> > be great.
> At times like these I wish the component placement file was searchable like
> the schematic. I would expect it to be near U1701, to the gps side of the
> battery and headset connectors, but so far I haven't spotted it. There's a
> pair of pads unlabelled between C1764 and H-TP1704 that seem a reasonable
> size and location but could be something else entirely.
Sorry about the non-searchability of component-placement. Actually I also find
it's very annoying.
I'll go to spot the capacitor for you. It's the only difference from A5
(non-boot) to A7(always boot).
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