Your issue sounds like that jumper issue. Samsung has sent out techs to clip that for you but the warm up counter indicates a power supply issue.
My TV recently bean flickering in a strobe like effect. This occurs after the unit has been on for 10-15 mins. The Samsung forums have indicated a 'known problem' that is reported to be a failing power supply. Makes sense since the unit needs to warm up before the issue evidences itself.
What are my options?