28
1.3 No Power DDCON / LDO
Please Refer page 24 -25 for Ref No.
DDCONs & LDO Check
Check Enable pin
voltage
Is voltage >2.5V?
1.2 No Power U-Com Failure
or
Enable source
Change Fuse
no
no
START
yes
Change DDCON
or LDO IC
Check fuse
F4xx / F6xx/F8xx/F48xx
Is fuse OK?
Check Vcc voltage
C4xx / C6xx/C8xx/C48xx
Is voltage >12.0V?
no
yes
yes
1) Check POWER_ON
P-on u-com IC401
#pin10
(Refer 1.2 No Power U-Com Failure)
2) Check Power board
Board
Operation
IC Ref
Voltage supply
BM5S21
DC/DC
IC600
5V_MAIN/5V_AUDIO
BM5S21
DC/DC
IC601
3.3V_MAIN/3.3V_AUDIO
BM5S21
DC/DC
IC804
0.8V_M5_CORE
BM5S21
DC/DC
IC807
1.8V_M5
BM5S21
DC/DC
IC808
1.0V_M5
BM5S21
DC/DC
IC810
0.8V_M5_CPU
BM5S21
DC/DC
IC811
0.8V_M5_GPU
Board
Operation
IC Ref
Voltage supply
BM5S21
DC/DC
IC4800
1.8V_BE_DDC
BM5S21
DC/DC
IC4801
1.1V_BE
BM5S21
DC/DC
IC4802
0.9V_BE_DDC_1
BM5S21
DC/DC
IC4803
0.9V_BE_DDC_2
BM5S21
DC/DC
IC4809
0.8V_BE
BM5S21
DC/DC
IC4810
0.7V_BE
T R O U B L E S H O O T I N G
SAFETY NOTES
SELF DIAGNOSTIC FUNCTION
TROUBLESHOOTING
SERVICE ADJUSTMENT
DIAGRAM
HANDLING GUIDE
28
SYS SET
2021/02/04 23:38:48 (GMT+09:00)