Sanyo LCD-42XR2 Service Manual page 34

5.2 A certain channel without picture of TV/AV YPBPR
Check the main board
Check if the X600 socket is
normal
Check the YPBPR input
circuit
S terminal channel
Check the all levels
circuit of S terminal
channel
Check if the VGA and
HDMI has same problem
Yes
Yes
YPBPR channel
No
No
AV/TV channel
No
No
Check the connection cable
and signal source is normal
Check if the supply power
(5v, 9v and 12v) is normal
AV/TV/S channel
Check if the X600 socket is
normal
Check if the input pin
of N400 has signal
Yes
Check the M52797
and peripheral circuit
32
Normal
No
Check the supply
power
Yes
Check the main board