Cannot Take Off GPS Disconnected

EXPO · Apr 11, 2025

Hello!

After a high speed, uncontrolled landing, I replaced the landing gear on the Phantom 4 Pro V1.
After installation of the landing gear, I now get a, "Cannot Take Off GPS Disconnected" massage and I cannot arm the motors.

Due to dji's lack of schematics, I began throwing parts at the problem

Hardware
Landing Gear (confirmed V1) - Replaced
GPS Module - Replaced
GPS Flex Connection Cable - Replaced
3 in 1 Board - Replaced
Battery Power Distribution Board - Replaced

Software
Reset To Factory Default
Downgrade to previous version
Upgrade to latest version.

Still cannot take off.
I reaching out to you guys in the hopes that someone else here has experienced and overcome this issue.

Thank You!

Starz · Apr 12, 2025

What information is visible in the sensor condition?
Compass and IMU.

Harleydude · Apr 12, 2025

I would guess that the puck antenna is cracked or disconnected. Reconnect and/or replace. You won't know anything until you open her up.

D

Starz · Apr 12, 2025

OP mentioned that he has already replaced the puck.
Could be he replaced with a defective unit?

Harleydude · Apr 13, 2025

Starz said:
OP mentioned that he has already replaced the puck.
Could be he replaced with a defective unit?

GPS "Module?" Hmmm... If that is what he is calling the "antenna," then I would edit the OP to reflect the correct nomenclature. That said...

Yes, a replacement puck antenna could be defective. I've only replaced two puck antennas in my life, and one of the replacements was defective out of the box. A 50% failure rate, if you will.

D

Starz · Apr 13, 2025

Antennas are in the landing gear on the P4 series. OP replaced those also.
I’m assuming(not a good thing to do at times)by”GPS Module” the OP switched out the GPS puck that resides in the center of the upper shell. Not a fun job on the Phantom series.

Harleydude · Apr 13, 2025

Starz said:
Antennas are in the landing gear on the P4 series. OP replaced those also.

Those are not GPS antennas.

Starz said:
I’m assuming(not a good thing to do at times)by”GPS Module” the OP switched out the GPS puck that resides in the center of the upper shell.

MY assumption (agreed, not a good thing to do at times), is that the OP replaced the Flight Controller, where all of the GPS processing occurs. i.e. "GPS Module." The term "module" could be interpreted to mean any component of the GPS process....which is why I suggested more specific, accurate nomenclature. i.e. "Puck antenna."