U9500 Maintenance Guide
9 Troubleshooting
Issue 1.2 (2012-6-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
83
Figure 9-63
Handling process for the HDMI failure
HDMI failure
Check whether the pull-up resistor on
the MHL_CBUS_ID circuit functions
properly.
N
Resolder or replace
R3109.
焊
或
者
更
换
Y
Check whether the power supply to
the MHL is normal.
N
Rectify the fault by replacing
U3104 and other components
on the power supply circuit
respectively.
Y
Check whether the MHL output circuit
is in good condition.
N
Y
Replace U301.
Does the phone function properly after
having U3103 replaced?
Y
End
N
Check whether J1900 is in good
contact with the MHL adapter cable.
Y
N
Ensure the two are in
good contact.
Check whether the MHL control circuit is
good condition.
N
Rectify the fault by replacing
U310 and components on the
peripheral circuit respectively.
N
Rectify the fault by replacing
T1901, U1900, U3102, and
components on the peripheral
circuit respectively.
