LG LF-U850D User Manual

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U-COM 5V VOLTAGE CHECK
SMPS ASSY CN943 -> 3PIN 5V OPERATION CHECK
MAIN PCB PN101 3PIN 5VCHECK
REFER TO SMPS TROUBLESHOOTING
YES
NO
MAIN PCB PN304 5PIN 5.6VCHECK
PN101 CONTACT STATUS CHECK
YES
MAIN PCB PATTERN DISCONNECTION CHECK
YES
NO
FRONT CN304 29PIN 5.6V CHECK
FFC WIRE ASSEMBLY STATUS CHECK
YES
NO
U-COM 17,46,72,90PIN 4.7V~5V CHECK
FRONT PCB PATTERN DISCONNECTION CHECK
YES
NO
Q303 (A103S) BASE "HIGH" CHECK
Q301, Q302,Q502,Q503(D1304S) BASE "HIGH" CHECK
C-COM 10PIN (HIGH) OPERATION STATUS CHECK
YES
IC603(CS5340) 10PIN,12PIN INPUT CHECK
IC603(CS5340) 2PIN (MCLK), 4PIN (SDOUT), 7PIN
(SCLK), 8PIN (LRCK) OUTPUT WAVEFORM CHECK
YES
Q303(A103S)OPERATION STATUS CHECK
YES
REPLACE Q303(A103S) IF FAULTY
YES
MUTE
YES
NO
REPLACE EACH APPROPRIATE TR
NO
C-COM 10PIN LINE CHECK AND U-COM
REPLACEMENT
NO
MUTING CIRCUIT TROUBLESHOOTING (ON MUTE CONDITION)
HEAD PHONE MUTE CHECK

LG LF-U850D Specifications

General

Brand	LG
Model	LF-U850D
Category	Stereo System
Language	English