1-58 (No.RA070<Rev.001>)
Checking the output signal
from the MPU/DSP
Fail
Fail
Fail
Fail
Fail
Pass
Pass
Pass
Pass
The LCD displays control
It is unlikely that the BGA parts are broken.
Points to be checked
Normal voltage
/LCD_RST
R479
1.8V
Points to be checked
Normal voltage
/CS_F IC405 (4pin)
1.8V 0V 1.8V,
Points to be checked
Normal voltage
/CS4 CP410 (10pin)
After power-on, and
/CS4 has an abnormal voltage.
Check each of the following items.
Re-insert the FPC of Display Unit PCB.
Replace the Display Unit PCB.
As a result, if the abnormality yet, the MPU/DSP
or Flash Memory or mobile DDR may be broken.
Remove R479.
If the MPU/DSP side is less than 3.2V,
the MPU/DSP or Flash Memory or mobile DDR
may be broken.
Points to be checked
Normal voltage
32M L427 side CN402
3.2V
The BGA parts are not broken.
Remove L427 to check the voltage of the 32M.
If the voltage becomes normal, re-insert the FPC of
Display Unit PCB or replace Display Unit PCB.
The LCD display “INIT ERROR 1”.
If an error occurs when the mobile DDR
internal RAM reads or writes.
The mobile DDR may be broken.
1) /RST : MPU/DSP reset signal LOW Reset
2) /BINT : Battery final voltage monitoring LOW Final voltage
3) /PSW : Power switch signal LOW ON
4) /FRST : Flash memory reset signal LOW Reset
5) /CS_F : Flash memory chip select signal LOW Active
6) SBC : B control HIGH ON
7) LCD_RST : LCD reset signal LOW Reset
8) /CS4 : LCD controller chip select signal LOW Active
After power-on, and
1.8V fixed later
1.8V fixed later
If the IC405 (1pin) is 0V or 1.8V,
the MPU/DSP may be broken.
If the IC405 (2pin) is 0V or 1.8V,
the MPU/DSP or Flash Memory may be broken.
Pass
Points to be checked
Normal voltage
SBC MPU/DSP side R13
3.2V
Remove the following parts.
C28
IC6
R29
Q4
IC14
R13
If the MPU/DSP side is 0V,the MPU/DSP or
Flash Memory or mobile DDR may be broken.
1.8V 0V 1.8V,
Pass
When an error display appears on the LCD
