Question

A jaundiced judge might not
be able to

Answer 1

A jaundiced judge might not be able to make a final decision.

Since a judge's sense of justice has to be as impartial and unbiased as possible, such conflicting emotions of resentment and bitterness might cloud his judgment and give a wrong verdict

Answer 2

make the right decision if he is prejudiced against or hostile to certain groups of people.
jaundiced in the context of your question means; affected by or exhibiting envy, prejudice, or hostility.