DOM MB Diagnosis page

Board ID:

V5 00629

Source:

Loading

Symptoms:                            

Configuration memory, EPC8, failed to load

Analyst(s):

G. Przybylski

Analysis Procedure(s):

Attempt to reload CPLD and configuration memory failed. 
A quick check of the power supply voltages revealed a fault.  3.3V was less than 1V, 2.5V was less than 1V. 1.8V OK.
Further analysis deferred. 9/14/04 gtp
10/25/04. Last week George lifted the output beads isolating the switcher circuit from its loads. The 1.8 and 2.5 V outputs returned to normal output voltage, however, the 3.3V was still only 2.2V.  
Replaced U8, the MAX1702B switching controller.   Outputs OK unloaded.  Restored beads.  Outputs OK.
Reloaded CPLD, EPC8, and Flash memory. STF Test at room temperature OK.
A pad, U8-9, for an NC pin on the MAX1702 lifted while attempting to resolder the part.  Therefore, this is board is not a good candidate for deployment.

Root cause:

Faulty switching converter controller. (overheated during reflow?)

Mitigation:

Replace faulty part.

Disposition:

Software Testing

Any Other Information:

Traveler