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A2251 (820-01949) stuck in 12.76V power loop with suspected shorted SSD rail

2informaticos

2informaticos

Administrator
Staff member
Having short to ground on 2 different power rails, points to NANDs, or U9000.
Remove L/R9030 and check again in diode mode at C9030.
If still short, dead NANDs.

BTW, connect ALWAYS red probe to ground when checking in diode mode; you will never get OL reading!
 
notsulla

notsulla

New member
Removed L9030 and R9030 and with red probe on ground, diode mode at C9030 is 0.000V.

With that I’m assuming the NANDs are gone, I have replaced NANDs before and I’m comfortable with reballing/bgas, but I never ordered the NANDs myself nor have I configured them. Do you know any trustworthy suppliers that would pre program the NANDs or if you think its better to maybe attempt to configure them myself with a JCID?

Sorry for answering now, I couldn’t go to the workshop.
 
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