This request is slightly because "RSAG7.820.6392" refers to a specific motherboard used in several Hisense TV models , and there are different reasons you might be looking for this file.
To give you the right guide, could you clarify if you are looking for: Download File RSAG7.820.6392_Hisense LTDN40K321...
: Documentation showing the circuit diagrams and component layouts for that specific board. This request is slightly because "RSAG7
: Files used to update the TV's operating system or fix software bugs (usually installed via USB). Download File RSAG7.820.6392_Hisense LTDN40K321...