Troubleshooting Guide - LG CED-8081B Service Manual

Reset or Power Check.
Check it after connecting the power cable
only on interface cable for NO Reset or
Power ON.
Are the pin 41
and 44 of PN201 +12V and +5V
respectively after the power
cable connecting?
YES
Does the pin 1
of IC101 change 0V to 5V at the
power supply initial input mode?
YES
Are the X201 and X301 oscillating?
YES
•
Is the pin 16 of IC401 4.0V?
•
Is the pin 31 of IC401 2.0V?
•
Is the pin 5 of IC102 3.3V?
YES
•
Is the pin 7 of IC514 2.5V?
•
Is the pin 1 and 2 of IC514 2.0V?
YES
•
Is the pin 1 of IC512 8.0V?
YES
OK

TROUBLESHOOTING GUIDE

NO
NO
NO
NO
NO
•
Check the power(12V, 5V) short.
•
Check PC power cable.
•
Repair the PC power supply.
•
Check the IC101(RESET IC).
•
Check the IC102(PQ1U331), IC201
(OTI-9790), IC301(MB90F476)
•
Check the X201, X301.
•
Check the IC201, IC301.
•
Check the IC401(OTI9071).
•
Check the IC102(PQ1U331).
Check the IC514(NJM3414).
NO
•
Check the IC512(NJM7808).
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