LG LM-U1050A - Section 2. Electrical; Troubleshooting Guide

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VKK CHECK
P-SENS PART CHECK
CN701 3PIN DC -33V check
IC301 51PIN voltage check
SMPS Assy CN904 ➝ 5PIN 5V operation check
MAIN PCB CN701 5PIN 5V
MAIN PCB CN301 4PN 5V check
Refer to SMPS Troubleshooting
Refer to SMPS Troubleshooting
CN701 contact condition check
MAIN PCB PATTERN disconnection check
❏ TROUBLESHOOTING GUIDE
YES
YES
NO
NO
FRONT PN301 4PIN 5V check
FRONT IC304 operation status checck
u-COM 26PIN 5V check
YES
YES
YES
YES
YES
YES
NO
NO
Input voltage 4V or higer, output voltage
2.1V or higer operation check
IC304 KIA7042 replacement
SECTION 2. ELECTRICAL