LG LAS950M Service Manual page 33

ELECTRICAL TROUBLESHOOTING GUIDE
NO D_3.3V (DSP / MPEG)
YES
Is 3.7 VA to pin3
of IC309 normal?
YES
Is there DC voltage
to pin2 of IC309?
YES
Is there DC voltage
to pin6 of IC309?
YES
D_3.3V power line is normal.
NO DAC_3.3V (DAC)
YES
Is 3.7 VA to pin1
of IC302 normal?
YES
Is there H (3.3 V) voltage
to pin3 of IC302?
YES
Is there DC voltage
to pin5 of IC302?
YES
DAC_3.3V power line is normal.
NO
Check IC309 & 3.7 VA power line.
NO
NO
Check R348, R349, R352.
NO
Check IC305 & 3.7 VA power line.
NO
NO
2-14
Check R347.
Check R315.
Replace IC302.