1-152 (No.RA054<Rev.001>)
SECTION 5
TROUBLESHOOTING
5.1
Fault Diagnosis of the BGA (Ball Grid Array) IC
Overview
A flowchart for determining whether or not the transceiver can be powered on (the LCD does not function even if the power switch is
turned on) due to broken BGA parts.
BGA parts
MPU/DSP(IC404), mobile DDR(IC402), Flash Memory(IC401)
When the BGA IC is problematic, please bring the printed circuit board (XCA-033K-00/XCA-033E-01/XCA-034K-00/XCA-034K-01/
XCA-034E-01) in for service. Various ESN/ default adjustment values are written on the printed cicuit board for service.
Additionally various ESN stickers are included. (Please refer to "5.4 Replacing TX-RX Unit".)
After the printed circuit board has been readjusted, please attach any ESN stickers to the chassis. When "ESN Validation" is used,you
must modify the ESN register.
Checking power supply voltage
Checking voltage
Points to be checked
Points to be checked
Points to be checked
Points to be checked
Confirmed voltage
/IGN_OUT IC22(9pin)
ON: 0V
OFF: 0V 3.1V
The ignition key is kept ON.
Points to be checked
Confirmed voltage
/PSW_OUT IC22(15pin)
ON: 0V
OFF: 0V 3.1V
Normal voltage
Normal voltage
1.2V
19.2MHz
12M C40
1.8V
18M C57
3.2V
1.8V
3.1V
32M IC20(5pin)
1.8V
18M_3 IC21(1pin)
Power supply of each device is connected through the coil.
[MPU/DSP]
12M: L405, L406, L408
18M: L410, L411
32M: L412
[mobile DDR]
18M: L403
[Flash Memory]
32M: L401
18M_3: L413
Checking the clock
Checking the clock
Normal voltage (1.2V)
19.2MHz
MPU/DSP side R424
Pass
Pass
Pass
Pass
Checking the Reset/Control signal
Checking the control signal input to the MPU/DSP
/RST D14(Anode side)
/BINT2 CN17
The POWER key is pressed and held.
Checking the MPU/DSP input switch signal
The BGA parts are not broken.
The BGA parts are not broken.
Checking for an abnormal point
12M has an abnormal voltage.
[MPU/DSP]
Remove L405 and L406 and L408 to check the
voltage of the 12M.
If the voltage becomes normal, the MPU/DSP is
broken.
Note: IC24(12M DC/DC Converter Device) is
fragile in the scratch.
Be careful when you touch this parts.
[MPU/DSP]
Check the peripheral circuit of IC2.*2
Fail
Fail
Fail
Fail
/OVRB_OUT IC22(12pin)
3.1V
Remove L410 and L411 to check the voltage
of the 18M.
If the voltage becomes normal, the MPU/DSP
is broken.
[mobile DDR]
Remove L403 to check the voltage of the 18M.
If the voltage becomes normal, the mobile DDR
is broken.
32M has an abnormal voltage.
[MPU/DSP]
Remove L412 to check the voltage of the 32M.
If the voltage becomes normal, the MPU/DSP
is broken.
[Flash Memory]
Remove L401 to check the voltage of the 32M.
If the voltage becomes normal, Flash memory
is broken.
If the voltage is not corrected, there is a problem
other than the BGA parts.*1
18M_3 has an abnormal voltage.
[Flash memory]
Remove L413 to check the voltage of the 18M_3.
If the voltage becomes normal, Flash memory is
broken.
18M has an abnormal voltage.