5. Conclusion
5-1. EFA result: Abnormal D1N v.s GND I-V curve was found.
5-2. PFA result: Substrate damage issue was found at DSI I/F circuit. (Fig. 5-1)
5-3. Root cause: Substrate damage issue caused signal failed and induced the no display issue.
5-4. Suspected failure mechanism: The substrate damage issue might be caused by an abnormal electrical stress. But the source or mechanism of the electrical stress cannot be conclusively identified.