Samsung HLR4677WX/XAA Service Manual page 25

Alignment and Adjustments
2-11 Service
2-11-1 Service Hint #1 - DMD Board Assy
Problem : PIXEL DEFECT, VERTICAL LINE
Solution : Change the DMD Board assembly
2-11-2 Service Hint #2 - ColorWheel Assy
Problem : INCREASED NOISE
Solution : Change the Color wheel module
Samsung Electronics 2-21