Question:GPS invalid
Check whether the GPS antenna is firmly plugged into the MDVR;
Put the MDVR GPS antenna in an outdoor open place and check the signal strength;
Insert the GPS antenna that works normally on other MDVR into this MDVR;
Use a multimeter to measure whether the MDVR GPS feeder has 3V output. If there is no 3V output, the GPS feeder may be in poor contact;
GPS module damaged.
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