Socket SB21512 Fail Issue

Pin-Jet helped the customer find out the real reason for socket fail

3ea socket had SB21512 Fail during NPI engineering, and the true cause could not be found. Pin-Jet helped discover that the customer’s socket had wetting; however, after cleaned, reinstalled and tested, the abnormality still occurred. We cross-checked with another Corr IC and the manual test passed. It was confirmed that the read value of this Corr IC that had this abnormality easily was higher compared to the Corr IC that passed.

Problem Description

 ✔  Incident: Socket Fail SB21512
 ✔  Testing ambient temperature: 60
 ✔  Handler : HT-9046LS
 ✔  Test machine: HP93K-PS
 ✔  Target: Confirm the appearance of the socket / 3EA Socket Fail SB21512 confirmation.

Problem Confirmation

Target (1): Confirm the appearance of the socket

SK19951

SK19952

SK19956

Target (2): 3EA Socket Fail SB21512 confirmation

For Fail SB21512 Item read value Fail
Acceptance condition: Site -1 to Site 8 Max - Mini Gap must be less than 2 = Pass

Conclusion: The socket had wetting before cleaning

Item (Socket number)	SK19951	SK19952	SK19956
Before
After
Recommendation: Clean the machine with fixed frequency, clean the probe wetting problem and confirm that the probe is kept under good condition for testing.

Verification One: Socket Fail Confirmation

Cover test verification condition: By Socket NO: SK19952 verification / Use the same Cover

Contact test verification condition: By Socket NO: SK19316 verification / Use the same Corr Sample (NO:01)

Conclusion: It was confirmed that SB21522 was not a By Socket issue; it was related to the read value of Corr Sample NO:01.
Recommendation: Confirm whether the read value of the Corr Sample is abnormal again.

Verification Two: Corr Sample Verification

Conclusion: Verified that the read value of Corr Sample NO: 01 was abnormal; it was confirmed to be higher when compared to the read value of other Corr Samples.
Recommendation: Retrieve the Corr Sample.