It appears to be the data cable. I have an FTdx101D and a 7610 both connected to the LA-1K through a cable switch. If I turn on the amp after the radios I will occasionally get the blank screen on the LA-1K. The cable switch has 4 positions so I have been selecting an empty position before I turn on the amp. I have not seen the blank screen on the LA-1K since.
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73,
Jerry
Jerry Raia