No Sound (All Source )-Main Pcba - LG 22LN4050 Service Manual

7. 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
10pin of IC301
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Only for training and service purposes
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
5
11pin of IC301
5
NO
Connect wire between P301 and speaker.
If 8V is not plus at L703, check
If is not Check Line between L703
If 3V is not plus 30pin of IC301,
if it is not, Check Line between L301
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
R301(SDO)
R302(WS)
R304(MCLK)
- 19 -
of JK700 is open.
and IC301 is open or short.
.Another is change IC301
check It is over 3V at L301
and IC301 is open or short.
IC301 or IC501.
IC301 or IC501.
of speaker is under 4ohm.
Another is change IC301
R303(SCK)
6
1pin of P301(Audio out)
LGE Internal Use Only