LG LM-U2350A - SECTION 2. ELECTRICAL SECTION; ELECTRICAL TROUBLESHOOTING GUIDE; SMPS POWER CIRCUIT TROUBLESHOOTING

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SECTION 2. ELECTRICAL
❏ ELECTRICAL TROUBLESHOOTING GUIDE
■ SMPS POWER CIRCUIT
P-SENS PART
VKK CHECK
SMPS ASSY CN902 ➞ 7PIN 5.1V CHECK
MAIN PCB CN710 7PIN 5.1V CHECK
MAIN PCB CN304 5PIN 5.1VCHECK
FRONT PN302 36PIN 5.1VCHECK
FRONT IC306(RESET IC)
STATE CHECK
U-COM IC304 26PIN 5VCHECK
SMPS TROUBLESHOOTING CONSULT
CN710 CONNECTION STATE CHECK
MAIN PCB PATTERN CUTTING AND
SHORT CHECK
IC306 INPUTVOLTAGE4V,
OUTPUTVOLTAGE.2.1VSTATECHECK
IC306 KIA7042 CHANGE
NO
NO
NO
YES
YES
YES
YES
YES
CN710 10PIN DC -33V CHECK
IC304 51PIN VOLTAGE CHECK
SMPS TROUBLESHOOTING CONSULT
NO
YES