Tool/software:
Electrical Test Init (U3D-)
- Encounter 4 units that failed Electrical Test Init (U3D-) during functional test. Measurement of the U3D- voltage is out of spec
|
Unit |
Serial Number |
Test Results (Lower spec = -2.550V, Upper Spec= -2.850V) |
|
#1 |
240815021 |
Failed ElectricalTestInit: -1.701 V |
|
#2 |
240815022 |
Failed ElectricalTestInit: -2.502 V |
|
#4 |
240815024 |
Failed ElectricalTestInit: -2.532 V |
|
#8 |
240815028 |
Failed ElectricalTestInit: -2.077 V |
- Based on schematics, the U3D- voltage is related to BGA (IC1)
- No abnormality observed on the BGA (IC1) solder during 2DX scan
- Visual inspect observed no damage component
- After replace with new BGA (IC1), the units able to pass the Electrical Test consistently.
Attached schematics snippet that shows the input supply voltage (U3D+ and U3D-) to the B1 and B3 pins of component IC1.
FYI, the VOUT measurement from IC53 and IC11 were within spec.
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As mentioned to Naphat in mail conversation, the -V input supply voltage (U3D-) is out of spec and highly suspected is due to the +0.8Vdc leakage from component IC1.
Let us know what information that you need to help us further analysis of this defect samples?
