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1
5.5 USB/iPod TROUBLESHOOTING
QQ
3 7 63 1515 0
A
iPod block Troubleshooting
Step 1: Check of power supply
* Turn ON the power of product and check the power supply by
iPod function.
4in1 MOD ASSY
1
IC1 (Pin 5)
3.3V regulator output (V3D)
Is
No
the voltage
3.3 V ?
B
Yes
The output and GND maybe
short-circuited.
Check the peripheral circuit.
2
Q471 (collector)
Local power supply for 3.3V USB (V+3DU)
Is
No
the voltage
3.3 V ?
C
Yes
TE
L 13942296513
Check the peripheral circuit of Q471
and Q472.
Replace of Q471 and Q472.
3
IC401 (Pins 19,39) USB u-COM (V3US)
D
Is
No
the voltage
3.3 V ?
Yes
4
IC408 (Pins 1,40)
iPod activation IC (V3UI)
Is
No
the voltage
3.3 V ?
E
Yes
5
IC501, IC502 (Pin 5) USB signal switching IC (V3D)
Is
No
the voltage
3.3 V ?
www
Yes
F
USB SW (iPod Digital audio signal switching)
28
1
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2
Is IC1
No
abnormally hot
?
Replace of
Yes
IC1.
No
Is base (USB PWR)
of Q472 high?
Check the
Yes
voltage Pin 19
(USB POWER)
of CN3 at 5V.
Check the pattern between
Q471 and IC401.
Check the pattern between
Q471 and IC408.
Check the pattern between
Q471 and IC501, IC502.
x
ao
y
.
i
2
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3
8
SYSMAIN ASSY
6
IC1003 (Pins 25,26)
Is
the voltage
3.3 V ?
No
7
IC1102 (Pin 1)
Is
the voltage
5 V ?
Yes
Q Q
3
6 7
1 3
Check the pattern between
IC1101 and CN1003.
u163
.
XV-LX61DV
3
4
2 9
9 4
2 8
USB bus power (V5USB)
Yes
Power supply is OK
To step 2
Is Pin 4
No
No
(S60, USBCTRL)
of IC1102
high?
Check the
Yes
voltage Pin 60
(USB CTL)
of IC1001
at 5V.
Check the peripheral circuit of
IC1102, and is not XFALG LOW?
Replace of IC1102.
1 5
0 5
8
2 9
9 4
m
co
4
9 9
2 8
9 9
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Table of Contents
Troubleshooting
