LG NP8540 - Page 30

3-7
ONE POINT REPAIR GUIDE
IF NOT BOOTING WHEN YOU TURN ON THE SET.
3-3. IC103 (NO 3.3 VA)
3-3-1. Solution
Replace IC103 on main board.
3-3-2. How to troubleshoot (Countermeasure)
1) Check 3.3 VA of IC103 Pin48(VIN).
2) If 3.3 VA is abnormal, follow the stage 3-2 at the previous page.
3) If 3.3 VA of IC103 Pin48(VIN) is OK, check the EEP_CLK(Pin1), EEP_DAT(Pin2) signal.
If signal is abnormal change the IC103.
4) If the EEP_CLK(Pin1), EEP_DAT(Pin2) signals are OK, check the IC100 Pin8(VCC / 3.3 VA).
If Pin8(VCC / 3.3 VA) is OK, change the IC100.
3-3-3. Service hint (Any picture / Remark)
< Main board top view >
IC103
IC103
IC100
IC100