LG ID2750 Service Manual page 42

4.2.3 Check SBI Control Signal
Test Point
U103 Pin 1, 2, 32
(SBST,SBDT,SBCK)
Circuit Flow
NO
Download the SW
Check Pin 1,2,32
Level is appear?
YES
NO
Similar Waveform? Download the SW
YES
Control Signal is OK
See next page to check
RFT6122 Circuit
Waveform
SBDT
SBST
SBCK
SBCK