| Electronics > Repair |
| Series defect on agilent 167xx boards? |
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| MarkL:
--- Quote from: nikodem on February 10, 2021, 06:05:53 pm ---I have locate a single trace, that was broken between the acqusition ASIC and the FPGA glue logic :clap: that damn f...failed trace was hidden UNDER OVERLAY, uh. It was looking kinda clocky, as it was length matched. --- End quote --- This is why I cautioned you to methodically test end-to-end by probing the vias. Corrosion damage is sometimes difficult to see. --- Quote ---Now I see the following result of anlyBusTest: ... --- End quote --- See attached photo for the trace that carries anlyBus bit 00000002. I have indicated the two endpoint vias and the probe pad in the middle. Again, a common spot for corrosion breaks is around the probe pads, but can occur anywhere. |
| MarkL:
Glad you got it working, and you're welcome! I didn't see your EDIT to your post that you got it working until after I posted. (Actually, not until today.) Which trace did you fix? Was it the one I showed in the photo or something else? Did your additional tests succeed also? |
| Hamster:
seems i got the runner failure delima.. i have 3 dead 16751A i have 2 dead 16750A i have 1 dead 16534A working: 2 16534A working: 2 16715A working: 1 16716A i have a 1680A now, so probably not going to spend to much on these.. probably going to scrap. i will keep the 715/716A ( after removing the runners and cleaning ) , its funny how they were completly caked in dust.. seems the dust saved them. all cards with issues look like large xilinix chips with silver tops have started to "corrode/rust" seems these boards all have a limited lifespan. |
| MarkL:
I've had corrosion/rust on the Xilinx tops too. No metal on these boards seems to be safe. The 16534A is the most repairable of the bunch. I wouldn't scrap that. Out of 6 or 7 broken 16534A cards that I had, I was able to fix all of them. Most had corroded traces and visibly damaged components which were easily repaired. |
| Hamster:
Yep, Fixed the 16534. I was able to fix a 16751A that had just about every test failed, now down to 3: Analyzer Chip Memory Bus Test System Clocks ( Master/Slave/Psync) Test Analyzer Memory Bus SU/H Measure Any suggestions on best method to "Safely" remove the plastic runners without damaging traces? i pulled up two pads removing one.. but they were just pogo pin test pads, so was able to repair without issue. |
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