When fault finding, do not use plugins like AutoBouquetsMaker (ABM) or Auto Bouquets 28.2 (AB 28.2).
Instead perform a "manual scan". It is is with Tuners & Scanning or Reception
Tuner: Select the Tuner you want to use
Type of scan: Change to Single satellite
Satellite: Set to 28.2 (unless you are scanning another satellite)
Network Scan: I set this to no from past experience. However it is meant to use the NIT table
Clear before scan: Set to Yes to remove existing services it does not find.
Only Free scan: Leave this to default of "no"
You should receive 850+ services. If you don't, it could be an LNB fault, (some will misbehave when two receivers are connected to it) alignment, cabling fault, tuner fault, PSU fault or f-plug connector issue.