Muting Troubleshooting (Mute State); Expend Ic (Ic501 / 502) State - LG MDV902 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