LG SPJ2B-W - Power Amp Part

3-8
ELECTRICAL TROUBLESHOOTING GUIDE
3. POWER AMP PART
YES
YES
YES
YES
YES
YES
YES
Power AMP part
OK
Refer to
Power part troubleshooting.
Check IC104.
Replace the related part.
Check input power of IC500
pin2, 3, 34, 35, 40, 41, 44, 45 21 V input.
Check I2S signal input IC500 pin20, 21, 22.
Check IC305 I2S signal output.
NO
NO
NO
The main power of 21 V.
Check IC500 pin13, 27
3.3 V input.
Check resistance R370, R376, R377.