LG LM-U2350A - MUTING TROUBLESHOOTING

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MUTING TROUBLESHOOTING (MUTE STATE)
EXPEND IC(IC305/501/502) STATE
Q752(A102) BASE "HIGH"
Q701, Q751(D1302) BASE "HIGH"
CHECK
16 PIN VDD VOLTAGE CHECK
3 "EXP-CLK" CHECK
2 "EXP-DATA" CHECK
4 PIN ~ 15 PIN EACH PORT STATE
CHECK
EXPEND IC OK
MUTE
EXPEND IC(IC305) 5PIN HIGH STATE
CHECK
Q752(A102)STATE CHECK
Q752(A102) FAULTY IS CHANGE
EACH PART TR CHANGE
D332/D553/D551(1SS133) CHECK
D332/D553/D551(1SS133)
CHANGE
PCB PATTERN CHECK
PCB PATTERN CHECK
MICOM (IC304) 4/84/85 PIN
CHECK(CLK1/2/3)
MICOM (IC304) 3 PIN CHECK
EXPEND IC FAULTY IS CHANGE
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES