DOM MB V5 Diagnosis
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Board ID:
V5.0L 000530
Source:
George Chao
Symptoms:
August 6: Communications failoure out of HASS
Suffered fall to the floor during handling in the 'cemetary...'
October 21: Boot failure at beginning of cold
Analyst(s):
G. Przybylski
Analysis Procedure(s):
August 6: Reload CPLD firmware; Reload EPC8
firmware/software; Reload flash file system.
Repeated boot and start of STF. No failures noted.
Passed room termperature STF Suite.
October 21: Inspection of U8 reveals suspicious soldering quality.
Recommend replacement of U8, and more strenuous boot testing.
Helen replaced U8 12/1/04.
Ran approx. 2000 reps of periodic reboot test while cycling
temperature between -55°C, and +65°C; No boot failures.
Ran temperature profile from -40°C to -75°C;
Serial ADC failures on many channels from -45°C to -60°C.
Local coincidence loopback test failures from -65°C to
-75°C.
Root cause:
Probable faulty U8, or U8 soldering
Mitigation:
Component replacement, with thorough testing
Disposition:
In spite of suffering a fall, probably OK for deployment.
Any Other Information:
Traveler August 6, 2004
Traveler
October 27, 2004
Other views
U8 View
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