Humminbird 787c2 not recognizing GPS receiver

[MikeG3Boat]

My Humminbird 787 is not recognizing GPS receiver. I have troubleshoot down to the unit by doing the following.

1. Hooked up different Humminbird to plug ins for 787 and the other Humminbird sees GPS.

2. Moved 787 to where other Humminbird was and connected it didn't recognize any GPS.

So GPS wiring is fine to both locations but only 787 doesn't see GPS.

Anyone ever had this problem? With unit? What did you do? Humminbird said I should take it to a certified tech to have it repaired. I am wondering if anyone has fixed this type of issue?

Any help is much appreciated. I hate to pay someone if it is a simple fix.

[icefisker]

I just had the same issue, you can read down on the thread below... i have a 597 and i kept getting an error message that the internal GPS was "unconnected".

Do you have an internal GPS and are you getting the same message? I had to bite the bullet and send it in yesterday... $192!!!!!!!!!

[MikeG3Boat]

My Accessory screen says GPS is unconnected. So same issue your having except my has an external GPS. Mine is also acting weird screen occasionally comes up and says send test command and won't do anything. It freezes and only way out is to disconnect power.

It is really bugging me..........

[BartmanMN]

Your battery is still good isn't it? Probably not an issue, but worth ruling out.

[MikeG3Boat]

Battery is fine it is powering another humminbird just fine. Any other ideas.

[delcecchi]

I think you have narrowed it down to the unit. One last question... Did the

GPS ever work on this unit?

If it did, operator error probably ruled out...

[MikeG3Boat]

Yes it did work at one time. I am sure that it is the unit. I just want to know any other things I can try before I send the unit in for repair.