LG DR1F9H User Manual

4-2
ELECTRICAL TROUBLESHOOTING GUIDE
Are pin 44 of
LPB271+5V, pin41 of LPB271+12V
respectively after the power cable
connecting?
Reset or Power Check.
Check for power(5V/12V) short.
Repair the SMPS Block
Check LIC401(3.3V regulator IC).
Check LIC201, LIC121.
Does pin #1
(Reset) of LIC271 change 0V to 3.3V
at the power supply initial input
mode?
<Power>
Is pin 5 of LIC401 3.3V?
<Reference>
1.65V(VREF) : Check pin113 of LIC121?
2.2V(HDVREF): Check pin78 of LIC121
NO
NO
YES
YES
YES
YES
Is LX201 oscillating?
Check LX201(16.9MHz).
Check LIC201.
NO
Check LIC401.
NO
Check LIC121.
NO
Check it after connecting the power cable
only on interface cable for NO Reset or
Power ON.
YES
OK

LG DR1F9H Specifications

General

Brand	LG
Model	DR1F9H
Category	DVD Recorder
Language	English