LG FH2 - Page 22

3-5
ONE POINT REPAIR GUIDE
NO POWER PROBLEM
No power problem occurs when you power on. (No Display)
1-4. DSP (Micom)  IC105
1-4-1. Solution
Replace IC105, IC9, Y2 on MAIN board.
1-4-2. How to troubleshoot (Countermeasure)
1) Please check Vcc voltage. (pin A4, A10, D4, D14, P4, P14, U5, U6, U9 of IC105  3.3 V)
If 3.3 V voltage doesn’t come out, replace IC9.
2) Please check Vcc voltage. (pin A9, E9, J4, J14, P9, P12, T10, U4 of IC105  1.2 V)
If 1.2 V voltage doesn’t come out, replace IC9.
3) Please check Crystal Frequency (Y2)  24 MHz and Replace it.
4) Please check RESET voltage. (pin T11 of IC105  3.3 V)
If 3.3 V voltage doesn’t come out, replace IC104 and R161.
5) Please check P-Sens voltage. (pin A6 of IC105  3.3 V)
1-4-3. Service hint (Any picture/ Remark)
< MAIN circuit >
< MAIN board top view >
IC105
IC105
IC105
IC105
IC104
IC104
Y2
Y2
Y2
Y2
IC9
IC9
IC104
IC104
IC9
IC9