GPS invalid troubleshooting method

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.