Samsung LN40M81B Owner's Instructions Manual page 29

Selecting a Signal Source (External a/V) for PIP.
3. Press the ▲ or ▼ buttons to select "Source", then press the EntEr button.
Select the source of the sub picture (PIP) by pressing the ▲ or ▼ buttons and
press the EntEr button.
The sub picture can serve different source selections based on what the main
picture is set to.
Press the SourCE button on the remote control to select a signal from an external
source PIP
Changing the PIP Channel
4. Press the ▲ or ▼ buttons to select "Channel", then press the EntEr button.
Press the ▲ or ▼ buttons to select the desired channel in the PIP window.
Press the EntEr buttons.
The channel can be active when the sub picture is set to TV.
Press the Ch buttons on the remote control to change the channels in the PIP
screen.
English - 
Setup
tV tV
Setup
▲More
light Effect : Watching mode on ►
Wall-Mount Adjusment
Home Theater PC : Off
Energy Saving : off
AV Color System : Auto
hDmI black level : low
PIP
move Enter
move Enter
tV PIP
PIP : on
Source : hDmI
tV
aV
Size :
aV
Position :
Channel : Cable 
move Enter
tV tV Setup
Setup
▲More
light Effect : Watching mode on ►
Wall-Mount Adjusment
Home Theater PC : Off
Energy Saving : off
AV Color System : Auto
hDmI black level : low
PIP
move move Enter Enter
tV PIP
PIP : on
Source : tV
Size :
Position :
▲
Channel : Cable  8
▼
move Enter
►
►
►
►
►
►
return
return
return
►
►
►
►
►
►
return return
return