Sony XR-55X90K Service Manual page 24

TROUBLESHOOTING
1.3 No Power DDCON/LDO
Board
Operation IC Ref
DC/DC IC418
LDO IC403
DC/DC IC600
DC/DC IC618
DC/DC IC603
DC/DC IC801
DC/DC IC802
DC/DC IC803
DC/DC IC804
LDO IC806
BM5STY
DC/DC IC813
DC/DC IC812
LDO IC809
DC/DC IC810
DC/DC IC811
LDO IC2201
DC/DC IC4800
DC/DC IC4801
DC/DC IC4802
DC/DC IC4803
DC/DC IC4809
DC/DC IC4810
Voltage supply
5.0V_STBY_H
3.3V_MAIN_H
5V_MAIN/5.0V_VBUS/5V_AUDIO
3.3V_MAIN
1.0V_TU_P
1.1V_M5_DDR
0.9V_M5_STBY
1.8V_STBY
0.8V_M5_CORE
1.8V_M5_ET_STBY
1.8V_M5
1.0V_M5
3.3V_M5_STBY
0.8V_M5_CPU
0.8V_M5_GPU
1.8V_EMMC
1.8V_BE_DDC
1.1V_BE
0.9V_BE_DDC_1
0.9V_BE_DDC_2
0.8V_BE
0.7V_BE
Output ref. Enable pin
C510 R557
C416 IC403 Pin#3
C610 IC600 Pin#15
C727 IC618 Pin#4
C630 IC603 Pin#4
C806 IC801 Pin#4
C809 IC802 Pin#4
C812 IC803 Pin#4
C846 IC804 Pin#8
C818 IC806 Pin#3
C904 IC813 Pin#4
C898 IC812 Pin#4
C816 R917
C861 IC810 Pin#19
C874 IC811 Pin#19
C2216 IC2201 Pin#3
C4805 IC4800 Pin#4
C4813 IC4801 Pin#4
C4820 IC4802 Pin#4
C4828 IC4803 Pin#4
C4860 IC4809 Pin#8
C4876 IC4810 Pin#8
Enable source
Vin
P_ON_#2
P_ON_#2
1.8V_BE_DDC
P_ON_#2 or IC1000 #AL18
(EWS_PWR_ON)
R804/R907 (3.3V_STBY)
R804/R907 (3.3V_STBY)
R804 (3.3V_STBY)
P_ON_#1
IC1000 #AN19
(ETHER_PWR_EN)
P_ON_#2
P_ON_#2
R917 (3.3V_STBY)
P_ON_#2
P_ON_#2
P_ON_#1 or ORESETB
P_ON_#2
1.8V_BE_DDC
P_ON_#1
P_ON_#1
P_ON_#1
P_ON_#1
P_ON_#1 : P-on u-com IC401 #pin12
P_ON_#2 : P-on u-com IC401 #pin13
ORESETB : P-on u-com IC401 #pin14
Fuse Vcc ref.
- C505
- C415
F600 C601
F609 C726
- C628
- C801
- C807
- C810
F802 C831
- C817
F807 C902
F805 C896
- C815
F803 C855
F804 C868
- C2214
F4800 C4803
F4801 C4812
F4802 C4819
F4803 C4827
F4804 C4845
F4805 C4863
24
SYS SET