No Sound (All Source )-Main Pcba - LG 22LN4000 Service Manual

6. No sound (all source )-Main PCBA

NO sound (All source)
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Change speaker and wire
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Only for training and service purposes
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
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5
NO
Connect wire between P501 and speaker.
If 8V is not plus at L703, check
If is not Check Line between L703
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
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of JK700 is open.
and IC502 is open or short.
.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
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LGE Internal Use Only