Huawei U9500 Maintenance Manual page 88

U9500 Maintenance Guide
Figure 9-63 Handling process for the HDMI failure
Issue 1.2 (2012-6-30)
HDMI failure
Check whether J1900 is in good
contact with the MHL adapter cable.
Y
Check whether the pull-up resistor on
the MHL_CBUS_ID circuit functions
properly.
Y
Check whether the power supply to
the MHL is normal.
Y
Check whether the MHL output circuit
is in good condition.
Y
Check whether the MHL control circuit is
good condition.
N
Does the phone function properly after
having U3103 replaced?
N
Replace U301.
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9 Troubleshooting
N
Ensure the two are in
good contact.
N
Resolder or replace
R3109.
N
Rectify the fault by replacing
U3104 and other components
on the power supply circuit
respectively.
N
Rectify the fault by replacing
T1901, U1900, U3102, and
components on the peripheral
circuit respectively.
N
Rectify the fault by replacing
U310 and components on the
peripheral circuit respectively.
Y
End
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