When my son was a bit younger, he went through a Serious period of lying, similar to what you describe.  I had a casual conversation with him and told him that how valuable a person was depended on how truthful he was.  When he would tell me about anything after that, I simply considered ALL answers to be a lie, until I was able to Prove that his answer was the truth.  It took several months to break him, I had to be just as stubborn as he was.  But, he started to tell me that he Really was telling the truth, and did not know why I did not believe him.  I told him that once someone tells a lie, people think Everything they say is a lie.  After the few trying months, he Never lied again (not even in high school).
As far as wasting time on TV or such; it is simply a matter of putting a time limit on the Amount of time you consider ok.  Have a discussion, let HIM set the amount of time AND the consequenses when the time limit is NOT followed.  I was always amazed that my children came up with Tougher consequenses than I would have.  Again; the parent has to be ready to follow through ALL the time.
As far as being angry, another talk might help.  Tell him that people enjoy being with someone who is happy and not angry.  Ask him why he is angry, if he can tell you -- try to fix the problem.  Otherwise, try to involve him in activities where being angry result in him receiving consequenses he does NOT like.
In my opinion, letting the child know that it is up to him/her to control themselves results in a better adult.  What do YOU want?  A good child? OR a good adult?
IF all else fails, do what I did, have the child go to counseling to find out what is troubling him.  If there is a boy's organization (like boy scouts, or even a Karate class) near-by, they often can help his self-esteem.