Sony XBR-55X900H Service Manual page 25

2021/04/27 23:25:57 (GMT+09:00)
1.3 No Power DDCON/LDO
BM5 and BM5S Board Model
Please refer page 22 - 23 for Ref number.
Board Operation
BM5/BM5S LDO
BM5/BM5S DC/DC
BM5/BM5S DC/DC
BM5/BM5S DC/DC
BM5/BM5S DC/DC
BM5/BM5S DC/DC
BM5/BM5S DC/DC
BM5/BM5S DC/DC
BM5/BM5S DC/DC
Board Operation
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
SAFETY NOTES
DDCONs and LDO check
IC Ref Voltage supply
IC400 5.0V_MAIN_H
IC600 5V_MAIN/5V_AUDIO
IC601 3.3V_MAIN/3.3V_AUDIO
IC603 1.0V_TU_P
IC804 0.8V_M5_CORE
IC807 1.8V_M5
IC808 1.0V_M5
IC810 0.8V_M5_CPU
IC811 0.8V_M5_GPU
IC Ref Voltage supply
IC4800 1.8V_BE_DDC
IC4801 1.1V_BE
IC4802 0.9V_BE_DDC_1
IC4803 0.9V_BE_DDC_2
IC4809 0.8V_BE
IC4810 0.7V_BE
SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING
T R O U B L E S H O O T I N G
START
Check fuse
F4xx / F6xx/F8xx/F48xx
Is fuse OK?
yes
Check Vcc voltage
C4xx / C6xx/C8xx/C48xx
Is voltage >12.0V?
yes
Check Enable pin
voltage
Is voltage >2.5V?
yes
Change DDCON
or LDO IC
SERVICE ADJUSTMENT
no
Change Fuse
no
1) Check POWER_ON P-on u-com IC401 #pin10
2) (Refer 1.2 No Power U-Com Failure)
2) Check G* board
no
1.2 No Power U-Com Failure
or
Enable source
DIAGRAM
25
HANDLING GUIDE
SYS SET