Read LG 22LN41XX / 22LN4110 / 22LN4130 (CHASSIS:LM91M) Service Manual online
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7. No sound (all source )-Main PCBA
Does wire connect P301 with speaker?
NO sound (All source)
YES
NO
YES
NO
YES
Connect wire between P301 and speaker.
1
Change speaker and wire
Is 19.4V at 19,20,31,32pin
of IC301 ?
If 8V is not plus at L703, check
of JK700 is open.
If is not Check Line between L703
and IC301 is open or short.
.Another is change IC301
2
NO
Is 3.3V at 40pin of 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
NO
3
4
YES
Is I2C waveform at
10,11pin of IC301?
Check Line between IC301 and IC501
is open or short, Another is change
IC301 or IC501.
NO
5
Is I2S waveform at
R301,R302,R303,R304?
6
Check Line between IC301 and IC501
is open or short, Another is change
IC301 or IC501.
YES
Is there any waveform P301?
Check Line between IC301 and P301
is open or short. And then check resistance
of speaker is under 4ohm.
Another is change IC301
NO
4
10pin of IC301
11pin of IC301
5
R301(SDO)
R302(WS)
R303(SCK)
5
R304(MCLK)
6
1pin of P301(Audio out)
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