LG PF-52A70 Service Manual page 21

NO TELETEXT
Abnormal
Check the 12V line
to be correct
No
Check/Replace
IC201
Check the voltage
of CT75(+)
12V
Abnormal
Check/Replace
ICT75, PT75
No
Check if the video
signal inputs at the
pin 40 of IC201.
Yes
Check the CVBS line
Abnormal
Check/Replace
ICT74.
- 21 -
Normal
Check the voltage of CT76(+)
4.8~ 5.2V
Check if the video signal
inputs at pin 8 of ICT74.
Yes
Check I 2 C Bus lines
(SDA, SCL)
OK
Check pins 15, 16, 17, 19
of ICT74.
Normal
Check/Replace
ICT76.