LG C3400 Service Manual page 73

4. Troubleshooting
Checking Flow
Does the LCD itself
Has no trouble ?
YES
Change the camera
module, Does it work
YES
Itís camera moduleís problem
Replace the camera module
Check the voltage of pin 12 of
Check the signals of the
Check the signals of the
Camera will work properly
START
properly ?
CN601 if 3V ?
YES
FL605~FL608
YES
FL605~FL608
YES
NO
Go to the LCD trouble
NO
Check the voltage
of pin 3 of
Q400 is 3V ?
YES
NO
Check the soldering
of CN601 ?
YES
Does the image
appears on LCD ?
NO
Replace
FL605~FL608
- 72 -
Replace the U401
NO
NO
Check the voltage
of pin 1 of
Q400 LOW ?
YES
Replace the Q400
NO
Replace the Q400
YES
Camera will work properly