We captured some failed boards with the “Spare Parts final” failure step on 15235 model at FT.
- checked the related components no soldering issue and cosmetic issue no found.
- Take 3pcs failed boards to x-ray, no open or short issue found.
- Reheat the failed U18 BGAs, test still failed.
- Re-mounted the failed U18 BGAs ,test still failed.
- Remove the failed u18 and remount it in the passed board, the fail step and information is same.