Muting Troubleshooting (Mute State); Expend Ic(Ic305/501/502) State - LG LM-U2350A Service Manual

MUTING TROUBLESHOOTING (MUTE STATE)

Q752(A102) BASE "HIGH"
YES
Q701, Q751(D1302) BASE "HIGH"
CHECK
YES
MUTE

EXPEND IC(IC305/501/502) STATE

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