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19LV2300 (CHASSIS:LA86D) - LG TV Service Manual (repair manual). Page 31

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- 31 -
Check the output (Pin AN28, AP29) of BCM355x
(IC100).
Measure waveform at R685, R686 because it
’s more
easy to check.
Can you see the normal signal? Refer to figure 1
Check the input of JK704.
Can you see the normal waveform?
Refer to figure 2
After checking the Jack, you should decide to
replace item or not.
Replace IC100
Monitor out-Audio(Out)
YES
YES
Figure 1
NO
If JK704 is damaged 
replace it.
NO
Figure 2
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