What does the umpire call, and what is left to the service judge and line judges?

Question

Accepted Answer

Under Law 17 of the BWF Laws of Badminton:

Official	Responsible for
Referee	Overall charge of the tournament or event
Umpire	The match, the court and its immediate surrounds; reports to the referee
Service judge	Service faults by the server (Laws 9.1.2 to 9.1.8)
Line judge	Whether the shuttle landed "in" or "out" on their assigned line(s)

The umpire must:

uphold and enforce the Laws, and in particular call "fault" or "let" when either occurs (including faults by the receiver and all non-service faults);
decide any appeal on a point of dispute made before the next serve;
keep players and spectators informed of the progress of the match (the score);
appoint or replace line judges or the service judge in consultation with the referee;
cover any duty where an official isn't appointed, and where an official is unsighted carry out their duty or play a let;
record and report to the referee everything relating to Law 16 (continuous play, misconduct, penalties);
refer unsatisfied appeals on questions of law to the referee.

Each official's decision is final on the facts they're responsible for, except that the umpire overrules a line judge who has clearly made a wrong call.