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8. No sound (all source)-Main PCBA
NO sound (All source)
1
Does wire connect P301 with speaker?
2
Is 19.4V at 19,20,31,32pin
of IC301 ?
3
Is 3.3V at 40pin of IC301?
4
Is I2C waveform at
10,11pin of IC301?
5
Is I2S waveform at
R301,R302,R303,R304?
6
Is there any waveform P301?
Change speaker and wire
4
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Only for training and service purposes
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
5
5
Connect wire between P301 and speaker.
If 8V is not plus at L703, check
If is not Check Line between L703
and IC301 is open or short.
.Another is change IC301
If 3V is not plus 30pin of IC301,
check It is over 3V at L301
if it is not, Check Line between L301
and IC301 is open or short.
Another is change IC701,IC301
Check Line between IC301 and IC501
is open or short, Another is change
Check Line between IC301 and IC501
is open or short, Another is change
Check Line between IC301 and P301
is open or short. And then check resistance
of speaker is under 4ohm.
Another is change IC301
6
- 20 -
of JK700 is open.
IC301 or IC501.
IC301 or IC501.
LGE Internal Use Only
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