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12. Component No sound
Check Component cable
OK
Check Jack Audio signal
L : R2802
R : R2803
OK
Check audio signal
L : R2802, C2803, R2810
R2815, C216
R : R2803, C2802, R2811
R2816, C219
OK
Follow procedure
"9. All source audio"
13. IR Out
Check IR (P4600) 7Pin and R4611
OK
Check the R3505
OK
Check the R3502
OK
Check Pin4 of RS232C(P702)
OK
Check PM_TXD line
R707
OK
Check PM_RXD line
R708
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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
NG
NG
Replace audio signal component
L : R2802, C2803, R2810, R2815, C216
R : R2803, C2802, R2811, R2816, C219
NG
NG
Replace Q3501, R3503, R3502
NG
NG
without RS232C connection with external box,
check the PU/PD resistor value of the external box in H/W side.
NG
NG
- 22 -
Replace Jack JK2802
Replace IR and Cable
Replace Q3500, R3501
If there is no problem
Replace IC3200
Replace IC3200
LGE Internal Use Only
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