Touchscreen Failure - Huawei Mediapad S7-PRO Maintenance Manual

Remark 2: The backlight cannot be turned on. See the following chart for maintenance
procedures.

9.7 Touchscreen Failure

Diagram of circuits:
2012-07-20
S7-PRO Maintenance Manual (Basic Version V2.1)
Display failure (no image) occurs
Check whether short circuit occurs in U40
No
Replace the LCD
Display failure occurs (the
backlight cannot be turned on)
Check whether short circuit
occurs in U1
No
Check whether short circuit
occurs in Q22
No
Check whether J9 shows any
insufficient or staggered soldering
No
Replace the LCD
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Yes Replace U40
Yes Replace U1
Yes Replace Q22
Yes Repair J9
INTERNAL
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