First let the customer unplug the HDMI line, re-enerrect to see if the front 4 indicators are on. If not on, may be machine failure, if can be lit, as he originally inserted in the HDMI input 4HDMI output 4, only need to press the button of the D output to switch to 4 can, after inserting HDMI does not light may be a short circuit phenomenon of the device.
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