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DLPC6401: lvds input port cannot detect sync signal

Part Number: DLPC6401

The Front is Mstar U69 ouput lvds (1280*800 60hz   clock 83.5Mhz )   and the back TI DLPC6401 lvds input .

Now the problem is DLPC6401 can not detect lvds input data, the blow is Debug message:

Event: Source No Syncs on channel

I have try allmost everything and have no clue to dill with it。