Speaker No Audio Output - LG CM2630B Service Manual

2. SPEAKER NO AUDIO OUTPUT

No audio output problem occurs when you power on the unit.
2-1. Solution
Replace IC700.
2-2. How to troubleshoot (Countermeasure)
1) Check IC700 Pin1(VCC_12 V) for driving the gate of IC700 (AMP IC).
a. If +12 V is low, there is possible for AMP IC to be damaged.
b. Remove bead among L700, L703.
When removed bead, if +12 V is recovered, the IC connected to it was damaged.
c. Replace the IC with a new one.
2) Check the impedance between AMP PWM output & GND.
a. If the impedance is about 0 Ω, the IC must be damaged.
b. Replace it with a new one (AMP IC).
2-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< MAIN board top view >
SPK OUTPUT
IC700
VCC_12 V
3-3