775 - Problem Communicating w/ Dish. Did you move the receiver or SWiM power inserter to a new location, room, or TV? Check the green light on the SWiM Power inserter is lit. Verify that the SAT-IN 1 cable is securely connected to back of the receiver. Still an issue like superairborneman stated you will need to call in for a service call
The box is about 3 to 4 inches, and then about 6 to 7 inches long with a green light on it. But it would be best to call in to DirecTV at 1-800-531-5000, and let them know you want a service call. Cause from what I have dealt with, it is in the line between the dish and the power pack. And it would be better to have a tech out and check the whole system.
Indicates your receiver is having trouble communicating with your satellite dish. As a result, your TV signal may be interrupted.
To solve the issue, you can try a few things:
Make sure all the cables connected to your receiver are secure.
You may have a device in your setup that looks like the device pictured here.
http://www.directv.com/cms2/equipment/accessori... This is called a SWiM Power Inserter. Make sure it's plugged into an electrical outlet or an active power strip and the cables connected to it are secure. Do not plug in the SWiM Power Inserter to an power outlet that can be turned off or this could continue to impact your viewing experience.
If all of these connections are secure, try resetting your receiver. On some receivers, there is a small red button inside the access card door on the front panel. Simply press this button and wait for the receiver to reset. If you have a receiver that does not have this button, you can reset the receiver by unplugging the power cord for 15 seconds and then replugging it.
If none of these solves the issue, you may need to schedule a service call. You can reach DIRECTV customer support at 1-800-531-5000.