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Overview
Short vertical flex cables. We suspect the 3 cables in the right bag passed electrical checks. The 6 cables on the right side of the left bag appear to be the cables identified as bad during the July 2018 BEI visit. There are 5 white slips, all face down, but on at least one you can read the word "Failed". We suspect the 5 cables on the left side failed electrical checks - it was noted during the July 2018 visit that there were some high resistance shorts that BEI was trying to address through a cleaning process. Electrical connectivity needs to be verified.
Photos of the long panels. Two panels were etched. The third panel was laminated but had no/minimal etching (there is a faint image of the circuit on the panel, which could either be photoresist or a very slight etch).
Side view of the HEMT region, showing severe buckling in this region of the panel
Closeup Photos Taken Using
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ppareg / B33 Wire Bonder Microscope
Photos of a delaminated trace that was deliberately bent over to allow view of underside of trace.
Another photo of delaminated traces
Photos of the transition between plated and unplated regions. Note the significant narrowing of the unplated traces. Some of the thinner unplated traces delaminated here.
More photos in regions near the plated / unplated transition.
Closeup of the narrow "chassis" trace, which had significant delamination in many cables. There appears to be no good reason for this trace being so narrow.
Miscellaneous Photos
Photos of wire bonder inspection setup
Paul's theory of what we are seeing
Closeup of unetched panel(?)
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Overview
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