Kirisun DP990 - Failed to receive signals; The green indicator glows but no sound is received; GPS failed to locate; Abnormal programming

DP990/DP995service manual
46
271
7MDC-4072-02A-G
STP antenna cathode contact
sheet
PCS
P18
1
Figure 1 Top-layer Layout Drawing of Main Board
Figure 2 Bottom-layer Layout Drawing of Main Board