Muting Troubleshooting (Mute State); Expend Ic (Ic501/502) State - LG MCV902 Service Manual

6. MUTING TROUBLESHOOTING (MUTE STATE)

MUTING TROUBLESHOOTING
(MUTE STATE)
YES
Q752(A102)
Emitter "HIGH"
YES
Q701, Q751(D1302)
BASE "HIGH" CHECK
YES
MUTE

7. EXPEND IC (IC501/502) STATE

EXPEND
IC(IC501/502) STATE
YES
16PIN VDD
VOLTAGE CHECK
YES
3 "EXP-CLK" CHECK
YES
2 "EXP-DATA" CHECK
YES
4PIN ~ 15PIN EACH
PORT STATE CHECK
YES
EXPEND IC OK
MICOM
NO
IC302 57PIN HIGH
STATE CHECK
Q752(A102) STATE CHECK
Q752(A102)
FAULTY IS CHANGE
NO
EACH PART TR CHANGE
NO
D553/D551
(1SS133) CHECK
MICOM
NO
(IC302) 39/44PIN CHECK
(CLK1/2)
NO
MICOM (IC302)
72PIN CHECK
NO
EXPEND IC
FAULTY IS CHANGE
3-4
NO
YES
YES
NO
YES
NO
YES
NO
YES
EXPEND IC(IC305)
STATE CHECK
YES
EXPEND IC(IC305)
FAULTY IS CHANGE
D553/D551 (1SS133) CHANGE
YES
PCB PATTERN CHECK
YES
PCB PATTERN CHECK