Huawei U8860 Maintenance Manual page 50

U8860
Maintenance Manual
Signal
MDDI_DP
MDDI_DN
MDDI_DN_DATA1
MDDI_DP_DATA1
LCD_RESET
MDP_VSYNC
LCD_ID0
LED+
LED-
The U8860 adopts 4.02 inches LCD. The backlight adopts six serial LED lights, which are
controlled by the backlight LED-driving chip RT9293BGJ6.
Troubleshooting process
Failure: The phone can be powered on, but its LCD is blank.
Solutions:
1.
2.
Issue 1.0 (2011-11-14)
If the phone displays a black screen, it may be LCD backlight fault.
If it is LCD fault, refer to the following troubleshooting process.
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Description
LVDS + signal
LVDS - signal
MDDI_DATA+
MDDI_DATA-
LCD power-on reset signal
Longitudinal frame synchronization signal
Supplier ID
The anode of the backlight LED
The cathode of the backlight LED
9 Principles and Troubleshooting
45