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8. No sound (all source )-Main PCBA
NO sound (All source)
1
Does wire connect P501 with speaker?
2
Is 19.4V at 2,34,40,44pin
of IC502 ?
3
Is 3.3V at 13,27pin of IC502?
4
Is I2C wavef orm at
23,24pin of IC502?
5
Is I2S wavef orm at
R510,R511,R512,R513?
6
Is there any wavef orm P501?
Change speaker and wire
4
23pin of IC502
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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
5
24pin of IC502
5
NO
Connect wire between P501 and speaker.
If 8V is not plus at L703, check
If is not Check Line between L703
and IC502 is open or short.
If 3V is not plus 13,27pin of IC502,
check It is over 3V at L501,L504,
if it is not, Check Line between L712
Another is change IC701,IC502
Check Line between IC502 and IC600
is open or short, Another is change
Check Line between IC501 and IC600
is open or short, Another is change
Check Line between IC502 and P501
is open or short. And then check resistance
R513(SDO)
R511(WS)
R510(MCLK)
- 19 -
of JK700 is open.
.Another is change IC502
and IC502 is open or short.
IC502 or IC600.
IC502 or IC600.
of speaker is under 4ohm.
Another is change IC502
R512(SCK)
6
1pin of P501(Audio out)
LGE Internal Use Only
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