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A:
1. No voltage output2. Poor contact or wire of the connecting line
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A:
1. Damage to the main board or keypad2. The bad host button is stuck
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A:
1. Short connection or cross connection of the line2. The floor platform is damaged
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A:
1. The floor platform is damaged.2. Short connection or cross connection of the line3. The floor decoder has the same room number4. One of the lines in DA or DB is not connected properly
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A:
1. The extension and platform lines have short connection, cross connection, bad contact and damaged plug2. The decoder port of the floor is damaged
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A:
S line is short or not well connected to other lines.
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A:
1. TV- or TV+ short connection with other lines or broken line
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A:
1, TV- or TV+ one of the lines is not connected properly 2, TV- or TV+ is short connected with other lines