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Service Manual
11.5 USB Hub (Upstream/Downstream Port) / Card reader does not work:
1.
Check LDO regulator voltage to 5V is correctly
received and correctly convert to 3.3V & 1.2V
2.
Further more, for the abnormal USB port, power
line of this USB port is advised to check.
1.
If Vcc are OK, check crystal Y1 oscillates.
2.
Reset circuit for USB Hub and Card Reader IC
are advised to check.
56
PA246Q
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