LG 24MN42A, Руководство по обслуживанию

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