LG 50PC5DC Service Manual page 21

TROUBLESHOOTING GUIDE
Component doesn't display
Check J5004,J5005.
Can you see the normal waveform?
YES
Check the input of Component
switch(IC5001,IC5002).
Can you see the normal waveform?
YES
Check the output of Component
switch(IC5001,IC5002).
Can you see the normal waveform?
YES
Check the input of MST3361(IC7004
Pin41,44,46).
Can you see the normal waveform?
YES
Check the output of MST3361(IC7004 ).
Can you see the normal waveform?
YES
Check the input and output of
BCM3550(IC4006). Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
NO
J5004,J5005 may have problem. Replace this Jack.
NO
After checking the input TR of component, you should
decide to replace component switch or not.
NO
After checking the Power of component switch you
should decide to replace component switch or not.
NO
After checking the Power of MST3361 you should
decide to replace MST3361 or not.
NO After checking the Power of MST3361 you should
decide to replace MST3361 or not.
This board has big problem because Main
YES
chip(BCM3550) have some troubles.
After checking thoroughly all path once again, You
should decide to replace BCM3550 or not.