Quoted from meeotch:Thanks for the reply. And yes - all the voltages I posted were measured prior to reseating anything. Also, edited my post to give the correct LED numbers.
Found the ASIC pinout on pinwiki. Looks like pin 35 is the third from the left, bottom edge, on the chip carrier. No continuity between that and either of the legs on the 203 LED. Tried on the back of the board, too, where pin 35 appears to be second from the right, bottom edge. Same results. Does that sound like the right test?
There aren't any traces leading from that pin that are actually visible, unfortunately... It seems that they're on the front of the board, not the back, and they're hidden underneath the carrier, so I can't follow them. The board looks super clean, though. See previous pics, and the one below.
The one suspicious thing is the minor damage at the lower-left ASIC corner. Looks like the case is chipped where someone tried to pop it out with a screwdriver or something. Maybe when I pushed (yes, gently) on it, I managed to worsen previous damage.
Going to order a PLCC puller, so that I can pull the ASIC and try reseating it. If someone could sanity-check my pin numbering & PLCC tool selection, that would be appreciated: amazon.com link »[quoted image]
Sorry. Didn't have a schematic earlier. Pin 35 should go to U21 ( just to the right of the ASIC) pin 9 and out pin 8 to the top of R7 (far left, just above the LEDs). The fact that there's logic and a resistor between the ASIC and the LED complicates things. Since pushing on things changed the state, I would be suspicious of the ASIC or a cold solder joint.
I second the recommendation of Rob Anthony and, of course, Chris Hibler who is more active on this site.
Pembroke Pines, FL
