Samsung CL29K40MQ2XXAP Service Manual page 33

Operation Instruction & Installation
11-1-3 Connection Jacks (Rear)
Use the rear panel jacks to connect an A/V component that will be connected continuously, such as a VCR or a DVD player.
Because there are three sets of input jacks, you can connect three different A/V components (i.e., a VCR and a DVD, 2 VCRs,
etc.)
11-2 Samsung Electronics