LG MCV903 - Power Amp Part Check

3-17
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Only for training and service purposes
LGE Internal Use Only
NO
CN710.2 PIN LOW→OFF
HIGH→ON
For each IC 701 Check the 3.20PIN
+65V input power
Check the 3.20PIN -65V input power
IC100. 51PIN
LOW→OFF
HIGH→ON
Check & replace the related
part
YES
NO
Check CN704
1.2 PIN +65 ,7.8PIN- 65
operation
YES
YES
Replace the SMPS
Troubleshooting
NO
Check the
power at both
terminals of R744,757 +65
Check the power at both
terminals of
R769,719 -65
YES
Check the power at both
terminals of the said part
NO
Check the
CN704 9PIN +9V, 10PIN
-9V power
YES
YES
Replace the SMPS
Troubleshooting
NO
Check the
power at both
terminals of L754 +9V,
L753 -9V
YES
Check the power at both
terminals of the said part
NO
Replace the related part
NO
Replace the related
part
16. POWER AMP PART CHECK