MFD issues on '04/'05 Prius

[hobbit]

Heh.. I knew it had "I" in it someplace, and found the interfacebus
pages about the same time you posted. Thanks! Now, I wonder where
it's supposed to have those 120 ohm terminators... can't be in the
nav, since I don't have that..
.
Oh, there's a crystal on the main board labeled "D629M3". Maybe
that's the IEbus clock at 6.29 MHz...
.
_H*

[sparkyAZ]

<div class='quotetop'>QUOTE(Drifty'sDad @ Sep 18 2007, 09:51 PM) [snapback]514616[/snapback]</div>

If its the solder joints failing I'd sure like to get a shot at one because I'm an Electronic's Engineer by trade and do micro soldering just about everyday. Most new equipment failure is either bad solder quality and or capacitors.

[/b]

I think the '04/'05 is pre RoHS, but it's going to be interesting to see if the failure rates increase in the newer models a few years down the road.

[Skwyre7]

AFAIK, there have not been any '05s or later that suffer from this issue. Mine is an early '05, so let's hope that it is somehow limited to the '04 MY.

[hobbit]

Well, at this point I'm pretty sure it's an IEbus network issue.
Work in progress; a couple of theories formed and then disproven.
.
Does anyone have one of the refurbs from Toyota installed, who would
be willing to let me have a quick look at it? I'd like to see what
was done or what parts changed from "bum" to "good". Maybe on my
way south or north on the perennial parental haul in December?
That, or I might eventually be able to offer a guide as to what
to look for.
.
_H*

[efusco]

<div class='quotetop'>QUOTE(hobbit @ Nov 15 2007, 04:52 PM) [snapback]540234[/snapback]</div>

Well, at this point I'm pretty sure it's an IEbus network issue.
Work in progress; a couple of theories formed and then disproven.
.
Does anyone have one of the refurbs from Toyota installed, who would
be willing to let me have a quick look at it? I'd like to see what
was done or what parts changed from "bum" to "good". Maybe on my
way south or north on the perennial parental haul in December?
That, or I might eventually be able to offer a guide as to what
to look for.
.
_H* [/b]

If your tour takes you near Nixa, Mo
I'd be glad to let you fiddle with mine...MFD that is.

[hobbit]

Update: I fixed it! Details are here. Another addition to the
"teardowns" collection.
.
If I can find the difference between this one and my original that
shows the engineering change, I won't need to look at other units.
Hopefully it would be the same problem cause in all of them -- given
the frequently reported symptoms, it seems likely.
.
There's NFW this piece is worth $3000. It's about the same level of
technology as a modern PC motherboard, and what's that, a couple
hundred bucks these days?
.
_H*

[bwilson4web]

<div class='quotetop'>QUOTE(hobbit @ Nov 18 2007, 01:06 PM) [snapback]541235[/snapback]</div>

Update: I fixed it! Details are here. Another addition to the
"teardowns" collection.
. . .
[/b]

Brilliant work but my tired, old eyes still don't see the crack. If you feel like, could you add an arrow pointing to the crack?

Bob Wilson

[efusco]

As usual Hobbit, fantastic detective work then surgery....unbelievable that it would be so subtle. I sure would've suspected a bad chip design or something.

You implied that you think it may be because the pin was on the outer edge of the connector that it was more prone to failure...do you think there's more movement there and that could cause it?

Great addition to the Prius literature. I really applaud the work and for sharing here.

[hobbit]

I added an ultra-magnified version of the same shot. That should
show it up better. The crack goes *around* where pin sits down on
the board, not straight through anything.
.
_H*

[galaxee]

wow! wtg hobbit! how many days of testing are we talking here?