I found a stripe on the mirror the first time I use it, as I showed in the picture. Can somebody help me with it? Thanks.
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Welcome to the DLP section of the TI-E2E forums.
This appears to be a micromirror Reset Block that is not connected or is poorly connected. From the picture it appears to be Reset Block 1 (i.e. 2nd block):
If this does not solve the issue then repeat this same thing at the DMD board to flex cable connection.