LG LSS-3200A Service Manual page 35

(E) IIC check
IIC SDA and SCL signals are output from
IC800(D20 & G16)? Fig. 06 & Fig. 07
YES
IIC SCL and SDA signals are output
from IC101(W17 & U15)?
Fig. 06
IC800(D20) : 5V IIC SDA signal
Fig. 07
IC800(G16) : 5V IIC SCL signal
NO
NO
3-26
Check IC101
Check IC800