Audio Output - Sanyo HT28745 Service Manual

TROUBLE SHOOTING FLOW CHARTS (Cont.)
NO SOUND
All Modes ?
No
Yes
Is there
signal at speaker
terminal ?
No
Is there
signal at IC001 2pin (L)
or 4pin (R) ?
No
RF(TV) only

Audio Output

only
AV1, AV2, AV3,
Digital Input
Yes
Check:
Speaker (SP901, SP902)
Check:
Yes
Line: IC001 6pin - IC801 (CPU) 2pin (Mute)
Parts: Around IC001 (Audio AMP.)
Check:
Parts: Around IC3401 (Audio Control), Q3410 (L), Q3420 (R)
Check:
Line:
A101 13pin - IC3601 11pin (MPX)
IC3601 2pin - IC1201 42pin (L)
IC3601 1pin - IC1201 40pin (R)
Parts: A101 (TU-IF), IC3601 (MTS Decoder)
Check:
Line:
Q3459 - Audio Output Terminal (L)
Q3432 - Audio Output Terminal (L-Mute)
Q3457 - Audio Output Terminal (R)
Q3433 - Audio Output Terminal (R-Mute)
Parts: Q3457, Q3459, Q3432, Q3433
Check:
Line:
AV1 Terminal - IC1201 2pin (L)/4pin (R)
AV2 Terminal - IC1201 8pin (L)/10pin (R)
AV3 Terminal - IC1201 14pin (L)/16pin (R)
DM Terminal - IC1201 25pin (L)/26pin (R)
Parts: Around Digital Module
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