LG LAS950M - Page 33

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