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CMS Pixel Detector
Miscellaneous
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Phase 1
Phase 2
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Layer 1 Replacement
Layers 2-4
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| Layer 1 Replacement Elog |
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Message ID: 183
Entry time: Fri Apr 3 17:39:19 2020
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| Author: |
Andrey Starodumov |
| Category: |
Module doctor |
| Subject: |
M1654 |
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After a protection cap glued to M1654, I observed a few strongly bent wire bonds and probably some shorts on ROC8. One (VD+) of them is even detached (on HDI side). Pads from 25/26 till 35 are affected.
Nevertheless the Reception test gave the same results as before the cap gluing: grade A.
It would be useful if Wolfram take a look and decide what to do. Silvan proposed to remove cap and repair wire-bonds.
I could test the procedure on a dummy module (I have one) with glued cap and, if successful, do the same with M1654.
For the moment the module is placed in Module doctor tray. |