LG CJS98F - Page 62

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ELECTRICAL TROUBLESHOOTING GUIDE
B
Check speaker cable connection.
Check IC600.
Check IC700, IC801.
Check IC601,IC603
Check SMPS.
Check Q700, Q701,
Q802, Q803.
Check IC600.
Check IC702.
Check IC602
Check SMPS.
Check Q706, Q707.
Pin39 ~ 50 of IC600
FL/FR± signal OK?
Pin13
of IC700, IC801 FL/FR
audio signal OK?
IC601,IC603
FL/FR audio signal OK?
±66 V, -12 V, ±5 V
power voltage OK?
Q700, Q701,
Q802, Q803
OK?
Pin45, 46 of IC600
SW1± signal OK?
Pin13 of IC702
SW1 audio signal OK?
IC602
SW1 audio signal OK?
±66 V, -12 V, ±5 V
power voltage OK?
Q706, Q707
OK?
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
OK
NO AUDIO CHECK