Huawei G510 Maintenance Manual page 62

Figure 9-25 Troubleshooting process when the LCD displays nothing
Circuit Symbols
Signal Symbol
VREG_L12_2P85
VREG_S3
MIPI_DSI_LANE2_P
MIPI_DSI_LANE2_N Differential signal (–)
MIPI_DSI_LANE1_P
MIPI_DSI_LANE1_P
LCD_RST
2013-01-28
G510 Maintenance Manual V1.0
The LCD displays
nothing.
Is the software
properly
reloaded?
N
Is there
back light?
Y
Is U910
properly
soldered?
Y
Is the
connector
J1201 properly
soldered?
Y
Return the U8825-1
to Huawei for repair.
Description
LCD analog voltage
I/O digital voltage
Differential signal (+)
Differential signal (+)
Differential signal (–)
LCD Power-on reset signal
Huawei Confidential
Y
End
N
Check L1201 and
U1201.
N
Re-solder U910.
N
Adjust J1201.
INTERNAL
Reference Measurement or
Waveform
2.85 V
1.8 V
1.8 V
1.8 V
1.8 V
1.8 V
1.8 V
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