BBK DV718SI - Page 45

4. Troubleshooting process for “Left channel has no sound” is shown in the figure 3.2.2.4:
Left channel has no sound
Check
whether pin 226 of
MT1389 has sound
output
MT1389 has trouble
Check
whether pin 1 of
U209 has signal
output
U209 has trouble
Check
whether pin 2 of
U209 has audio signal
input
Check the line between
MT1389 and U209
N
Y
N
Y
N
Y
Check
whether L205 has signal
output
Check Q206
N
Y
Check line and terminal
Figure 3.2.2.4 Troubleshooting flow chart for “Left channel has no sound”
- 41 -