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DLPC3479: single LED usage, failed to start projection

Part Number: DLPC3479
Other Parts Discussed in Thread: DLP4710LC

Our designed board has only one led connected to CH2_GATE_CRL(pin19 of DLPA3005), and CH1/CH3(pin20, pin21) are open.

Under this condition, DLPA3005 seems to detect some error and doesn't go to active state, even if PROJ_ON is high. 

GUI(DLP4710LC 2.2.0.5)EVM status:Not connected

 firmware version:DLP4710EVM-LC_Firmware_7.0.1.img

Please advise what should we do.