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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