LG LF-U850D User Manual

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SECTION 2. ELECTRICAL SECTION
P-SENS PART CHECK
SMPS ASSY CN943 -> 4PIN 5V OPERATION CHECK
MAIN PCB PN101 4PIN 5V CHECK
MAIN PCB PN304 27PIN 5V CHECK
REFER TO SMPS TROUBLESHOOTING
❏ TROUBLESHOOTING GUIDE
YES
YES
NO
PN101 CONTACT STATUS CHECK
MAIN PCB PATTERN disconnection check
NO
FRONT CN304 7PIN 5V CHECK
YES
FRONT IC302 OPERATION AND INPUT VOLTAGE 4.7V~5.0V CHECK
YES
YES
U-COM 26PIN 5V CHECK
YES
IC302 INPUT VOLTAGE 4.7V OR ABOVE , OUTPUT VOLTAGE
3V OR ABOVE OPERATION CHECK
IC304 KIA7042 REPLACEMENT
NO
YES
VKK CHECK
CN943 6PIN DC -33V CHECK
MAIN PCB PN101 6PIN VOLTAGE -33V CHECK
REFER TO SMPS TROUBLESHOOTING
YES
YES
NO
MAIN PCB PATTERN DISCONNECTION CHECK
NO
PN304 3PIN VOLTAGE CHECK (-33V)
YES
FFC WIRE ASSEMBLY STATUS CHECK
NO
FRONT PCB CN304 3PIN VOLTAGE CHECK (-33V)
IC301 51PIN VOLTAGE CHECK
YES
FRONT PCB PATTERN DISCONNECTION CHECK
NO

LG LF-U850D Specifications

General

Brand	LG
Model	LF-U850D
Category	Stereo System
Language	English