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8. No sound (all source )-Main PCBA
NO sound (All source)
1
Does wire connect P301 with speaker?
2
Is 3.3V at 40pin of IC301?
3
Is I2C waveform at
10,11pin of IC301?
4
Is I2S waveform at
R301,R302,R303,R304?
5
Is there any waveform P301?
Change speaker and wire
3
10pin of IC301
11pin of IC301
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Only for training and service purposes
NO
YES
NO
YES
NO
YES
NO
NO
YES
4
4
Connect wire between P301 and speaker.
If 3V is not plus 30pin of IC301,
check It is over 3V at L702
if it is not, Check Line between L702
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
R301(SDO)
R302(WS)
5
R304(MCLK)
- 20 -
IC301 or IC501.
IC301 or IC501.
R303(SCK)
1pin of P301(Audio out)
LGE Internal Use Only
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