LG FH2 - Portable Function Doesnt Work

3-7
ONE POINT REPAIR GUIDE
3. PORTABLE FUNCTION DOESN’T WORK
3-1. ADC (IC3)
3-1-1. Solution
Replace IC3, JACK10 on MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Please check 5.0 V of IC3 pin3.
If 5.0 V voltage doesn’t come out, replace IC11.
2) Please check 3.3 V of IC3 pin4.
If 3.3 V voltage doesn’t come out, replace IC9.
3) Please check analog input signal of JACK10 pin3, 2.
If signal doesn’t come out, replace JACK10.
3-1-3. Service hint (Any picture/ Remark)
< MAIN circuit >
< MAIN board top view >
JACK10
JACK10
IC3
IC3
IC11
IC11
IC11
IC11
IC3
IC3