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5.5 USB/iPod TROUBLESHOOTING
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 SYSMAIN ASSY
6
IC1003 (Pins 25,26)
USB bus power (V5USB)
1
IC1 (Pin 5)
3.3V regulator output (V3D) Is the voltage 3.3 V ? No Replace of IC1. Yes Power supply is OK To step 2
B
Is the voltage 3.3 V ? Yes
No
Is IC1 abnormally hot ? Yes
No
7
IC1102 (Pin 1)
The output and GND maybe short-circuited. Check the peripheral circuit.
Is the voltage 5V? Yes
No
2
Q471 (collector) Is the voltage 3.3 V ? Yes
Local power supply for 3.3V USB (V+3DU)
(S60,Is Pin 4 USBCTRL) of IC1102 high? Yes
No
No Is base (USB PWR) of Q472 high? Yes
No
Check the voltage Pin 60 (USB CTL) of IC1001 at 5V.
C
Check the voltage Pin 19 (USB POWER) of CN3 at 5V.
Check the peripheral circuit of IC1102, and is not XFALG LOW? Replace of IC1102. Check the pattern between IC1101 and CN1003.
Check the peripheral circuit of Q471 and Q472. Replace of Q471 and Q472.
3
D
IC401 (Pins 19,39) USB u-COM (V3US)
Is the voltage 3.3 V ? Yes
No
Check the pattern between Q471 and IC401.
4
IC408 (Pins 1,40)
iPod activation IC (V3UI)
Is the voltage 3.3 V ?
E
No
Check the pattern between Q471 and IC408.
Yes
5
IC501, IC502 (Pin 5) USB signal switching IC (V3D)
