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AKAI AFT-505 (5" TFT LCD COLOR TV) Service Manual
1、Fault Description：Showing Picture On Screen But No Sound
Confirm the volume isn't in silent mode before check.
N
O
Check
power
supply circuitry
Start
Check IC U8 (5) plug has
audio output or not
NO
Check IC U8 has 12V
power supply
YES
Check IC U8 (3)
plug has audio signal
input or not
NO
Check IC U7 (51) plug
has
audio
signal
output or not
NO
Check IC U7, the part of
accompaniment
way
circumjacent circuitry
YES
Check jack CN5 has
audio signal or not
NO
Jack J5
damaged
Check
circumjacent circuitry
Check R105 and C121
and
YES
Speaker
damaged
Y
E
S
IC
U8
and
YES
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