The locking up on one channel / no remote response/ will not change inputs Main Pc Board Must Be Replaced : Part # E22443 From Intial Technology Inc (800-216-5156). Unit will need new remote as the new board is programmed with new remote codes. They may give you one ; last time I repaired one I was told I needed to purchase one separately. It is absolutely necessary as you cannot change inputs without the remote. Parts should be around $150-$175 in total.