LG SPJ2B-W - Power Amp Part

4-5
ELECTRICAL TROUBLESHOOTING GUIDE
3. POWER AMP PART
YES
YES
YES
YES
YES
YES
Power AMP part
Check U201 signal out network, the device
a short circuit will cause no output.
Refer to No 24.7 V.
Check Q203, Q303.
Replace the related part.
Check Q300 pin5, 6, 7, 8
24.7 V output.
Check I2S signal input U201 pin9, 10, 11.
NO
NO
NO
The sub power of 24 V.
Check U201 pin8, 31
3.3 V input.
Check resistance R228, R229, R233.