Husqvarna 310 Docking problems Base station Circuit Board troubleshooting

AilbeL200

Husqvarna 310 base station docking problem, Husqvarna 310 is not docking- it goes up close to the base to the left and right ,travels close but eventually runs of battery and stops. I thought it was antenna problem under base station , but I now think it is due to circuit board in base station.

Any experts on husvarna 300 series out there?

Here is my problem and the steps I took to trouble shoot, and why I think it is circuit board.

My Husqvarna 310 will not dock as per above.

1) I swapped out the base station with another base station and it docked properly which leads me to believe it is the base station.

2) I checked power from Transformer, and am getting 28V

3) I have continuity on the 2 antenna cables under the base station

4) I have 28V going in at the connector in the circuit pcb board.

5) I have 26 volts between the spade connectors left and right boundary

5) I have 4.2 V between right spade connector (negative) and the guide spade

6)Robotic mower services channel on utube says the voltage should be 28V and 4.5V respectively , however , on the base station that it docks properly , the voltage is 26V and 4V respectively, so I don't think it is a voltage problem.

7) When I swap out the circuit board on base station, it docks properly.

8)I created a new loop signal as part of testing process, the guide wire is set to zero mins and I use the test guide wire facility to check the guide wire to base station docking facility.

All this would point to circuit board.

However, before I take it back to dealer, would anybody have any other ideas of what it could be? Thanks