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求助tfp401输出

Other Parts Discussed in Thread: TFP401, TFP401A

设备上电后tfp401解TMDS输出有问题,从示波器上看DE信号有较宽的脉冲在DE低电平间移动。如果将输入的Rx0,Rx1,Rx2差分信号与GND短接,此时输出错乱,2,3秒后释放不短接,DE信号正常,显示画面正常。不知什么原因,求高手指点!多谢。