On Fri, 09 Feb 2007 03:15:46 GMT, James Sweet
wrote:
Joachim Wunder wrote:
Hi there,
I have a garage door opener named "Liftboy SMD 3200" which was
installed into my garage back in 1990 (in Germany). I couldnīt get any
information about this garage door opener on the net. The motor
control PCB of it just failed this week. I suspect either any capacity
or the voltage regulator to be the culprit. Does anyone know the
manufacturer of the PCB shown under
http://img255.imageshack.us/img255/9023/cimg0094aq6.jpg ?
Unfortunately, the 40-pin PICīs type isnīt readable under the sticker
at all īcause its surface seems to have been scratched off under the
sticker by the manufacturer of the PCB. Yagh. Which PIC is it supposed
to be? There is a Quartz which reads "4.000 SUNNY 7624".
Moreover, the same applies to the 16-pin IC: Itīs surface seems to
have been treated by the manufacturer of the PCB, i.e. the exact type
has been completely scratched off on purpose as well. 
Is there any
way to find out which IC it might be?
Please advise.
TIA,
Joachim
The IC will have custom firmware on it so you won't be able to replace
it. Chances are unless the regulator has failed in a short circuit and
caused the voltage to rise, the chips are probably fine. Check to see if
the filter capacitor is shorted, I recently repaired an old Volkswagen
ECU that had a shorted electrolytic capacitor filtering the 5V output,
resulting in a dead car.
No, the filter capacitor is not shorted, I just measured it. Hmmm.