First checks
Confirm the code and service
Use this path for 771 on a DIRECTV satellite receiver. Write down the receiver model and whether all channels are affected before contacting support.
Open DIRECTV’s 771 checklist
Use the official connection checklist. Observe dish obstructions from the ground; do not climb onto a roof.
Save the result for support
If the issue remains, give support your model, code and what you checked. Do not buy a replacement LNB or receiver based on this code alone.