It will be very interesting indeed to see the reverse engineering repair for
these infernal items. I would also presume that GM Technician Centre in
Warren, Michigan may be of some interest if an inexpensive, after market,
viable repair can actually be preformed without involving any parts from one
of their suppliers. Please, Do keep us posted. Dying to see your specific
results.
"James Sweet" wrote in message
news:lkjPd.25327$Dc.16313@trnddc06...

"Bob Urz" wrote in message
...


Jerry G. wrote:
Most of the parts are priority type parts in these. You will not be
able
to
buy most of the parts on these boards. If it built up on a flex board,
even
fixing a cold solder connection will be difficult. The only fix is to
pull
it out, take it to a GM parts dealer, and pay the exchange for a new
one.
This is the same for all of these cars.

Come on guys, someone has tried to do this somewhere. There are a number
of internet sites advertising dash repair. And since GM does NOT sell
parts to do this, they have figured out how. Basically, these dashes
have a step up power supply to run the display tubes. Not brain
surgery, just a switcher and some parts. And i am guessing Jerry that
your right and there house numbered parts. But that does NOT mean
there not fixable. Once you know what the circuit does and the case
style of the output device, one can probably make some assumptions
and go to a parts catalog and try a few devices. Hell, it might just
be caps with bad ESR or solder joints. Other people are doing this.
Granted, customized CPU chips or ASIC would be a problem. But i believe
in the older dashes its just solder joints and power supply problems
for the most part.



What sort of tubes does the inverter run? If you have an idea of what sort
of voltage they require it shouldn't be too hard to put something
together,
I've built DC-DC coverters based on the MAX771, as well as small self
oscillating converters.