A jaundiced judge might not

be able to

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.

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