Internal DEMO Driver Board NG Analysis
One of the 4 demos shows abnormal projection on the projector screen due to re-work on the driver board causing impedance mismatch. The abnormal projection follows a fixed demo board. Further analysis reveals connection distortion and re-work traces on the DMD connector of the abnormal driver board.
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Presentation Transcript
Internal DEMO Driver Board NG Analysis 2021 02 07
Internal DEMO Driver Board NG Analysis One of the 4 demos has an abnormal projection when light on the projector. We did cross- validation, and the abnormal projection followed the fixed Demo board. The demo order information is as follows 208000201851 DLPDLCR2010EVM-bare PCBA 208000201949 DLPDLCR2010EVM-bare PCBA+ light engine Below shown the projection result for the four Demo after cross-validation Driver board light engine SN Result of projector on Driver board with light engine1# 1# normal Driver board with light engine 2# 2# normal Bare PCBA 3# 1# abnormal Bare PCBA 4# 1# normal Bare PCBA 3# 2# abnormal Bare PCBA 4# 2# normal Conclusion The abnormal projection followed the 3# Demo board.
Internal DEMO Driver Board NG Analysis Appearance check for 3# Demo From the appearance, the DMD connector of this abnormal driver board has traces of re-work, and the connector is seriously deformed due to re-work. Preliminary analysis is that the impedance mismatch at the connection caused by re-work causes the screen to be abnormal. Connector distortion There is some patical between the pins Trace of re-work DMD connector Bare PCBA
