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

ONE POINT REPAIR INSTRUCTION

5. SPEAKER NO OUTPUT WHEN YOU TURN THE UNIT ON

When you turn on the SET, it will show 'welcome' message continuously on the
front panel. And speaker have noise output.
5-1. IC604
5-1-1. Solution
Replace IC604_PS9831 on main board.
5-1-2. How to troubleshoot (Countermeasure)
1) Check 3.3 V.
2) Check X601 crytal operation.
3) Check IC604 to IC700 communication resistor R798, R703, R704, R709, R719, R708.
4) Check PWM waveform at R799, R731, R732, R736, R737, R746.
5) If check all of OK, please replace IC604.
5-1-3. Service hint (Any picture / Remark)
3-13