No Booting When You Turn The Unit On - LG MDD105 Service Manual

ONE POINT REPAIR INSTRUCTION

4. NO BOOTING WHEN YOU TURN THE UNIT ON

When you turn on the set, it will show 'welcome' message continuously on the front
panel. And it will not boot-up normally.
4-1. IC503(W25Q16A), IC3(SN74LV00A)
4-1-1. Solution
Replace IC503,IC3 on main board.
4-1-2. How to troubleshoot (Countermeasure)
1) If 3.3 V haven't on main board of P1, please check P-SENS 5V come out or not?
Please check D1 or replace D1 on SMPS.
2) Check or replace L509.
4-1-3. Service hint (Any picture / Remark)
3-9