DOM MB V5 Diagnosis page

Board ID:

V5 000142

Source:

George Chao

Symptoms:

All tests for ATWD B Ch2 and Ch3 failed;

Analyst(s):

G. Przybylski

Analysis Procedure(s):

Check ATWD analog control pin voltages. They look reasonable for both chips.
After the second ATWD B replacement,  a more detailed analysis of digital controls was undertaken.
The channel select MSB was found to be non functioning..  The problem was traced to an open PCB trace from the FPGA to the next via.  Bridging with a green wire restored functionality.
Ran a long term boot test, and temperature profile from -40C to -75Cb

Root cause:

TBD.

Mitigation:

TBD

Disposition:

TBD

Any Other Information:

Traveler