No Sound - Sanyo VIZZON HT30746 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
Digital Input only
AV1, AV2, AV3,
only
Yes
Check:
Speaker (SP901, SP902)
Yes
Check:
Line: IC001 1pin - Q001 - IC801 (CPU) 2pin (Mute)
Parts: Around IC001 (Audio AMP.), Q001 (Mute)
Check:
Line:
IC001 2pin - Q3410 - IC3401 4pin (L)
IC001 4pin - Q3420 - IC3401 3pin (R)
Parts: Around IC3401 (Audio Control), Q3410 (L), Q3420 (R)
Check:
Line:
A101 13pin - Q3508 - IC3401 13pin (MPX)
Parts: Around
A101 (TU-IF), Q3508, IC3401
Check:
Line:
IC3401 39pin - Q3458 - Audio Output Terminal (L)
IC3401 38pin - Q3457 - Audio Output Terminal (R)
Parts: Around Q3457 (R), Q3458 (L)
Check:
Line:
IC3401 34pin - Digital Module K1052 50pin (L)
IC3401 33pin - Digital Module K1052 48pin (R)
Parts: Digital Module
Check:
Line:
AV1 Terminal - IC3402 5pin (L)/14pin (R)
AV2 Terminal - IC3402 2pin (L)/15pin (R)
AV3 Terminal - IC3402 4pin (L)/11pin (R)
IC3402 3pin (L)/13pin (R) - IC3401 37pin (L)/36pin (R)
Parts: Around IC3402 (Audio Selector)
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