DOM MB V5 Diagnosis page

Board ID:

V5 00388

Source:

Azriel Goldschmidt

Symptoms:                            

Failed "no-light" test. Result same as full-light test

Analyst(s):

G. Przybylski

Analysis Procedure(s):

Setting ledmin results in the same value of control voltage from U31 as setting ledmax.
U31 chip select OK. U31 clock OK. U31 MOSI OK.  
Together this implies that U31 is faulty.

Root cause:

Faulty U31 DAC

Mitigation:

Replace faulty component.   (damage one PCB pad in the process)

Disposition:

Reapir.
Board passes complete room temperature STF suite.
Route to software testing.

Any Other Information:

Traveler