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Troubleshooting Guide - LG GWA-4164B Service Manual

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Reset or Power Check.
Check it after connecting the power cable
only on interface cable for NO Reset or
Power ON.
Are the pin 44 of
CN271+5V, pin41 of CN271+12V
respectively after the power cable
connecting?
YES
Does the pin #1
(Reset) of IC271 change 0V to 3.3V
at the power supply initial input
mode?
YES
Are the X201 oscillating?
YES
<Power>
Is the pin 5 of IC401 3.3V?
YES
<Reference>
1.65V(VREF) : Check pin113 of IC121?
2.2V(HDVREF): Check pin78 of IC121
YES
OK

TROUBLESHOOTING GUIDE

NO
NO
NO
NO
NO
Check the power(5V/12V) short.
Check the PC power cable.
Repair the PC power supply.
Check the IC401(3.3V regulator IC).
Check the IC201, IC121.
Check the X201(16.9MHz).
Check the IC201.
Check the IC401.
Check the IC121.
75

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