Sony XBR-55X900H Service Manual page 28

2020/06/27 06:31:32 (GMT+09:00)
1.3 No Power DDCON/LDO
BM5 and BM5S Board Model
Board Operation IC Ref
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
BM5 and BM5S Board Model
Board Operation IC Ref
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
BM5S DC/DC
SECTION 1
T R O U B L E S H O O T I N G
DDCONs and LDO check
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
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
SECTION 2
S E C T I O N 3
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
SECTION 3 SECTION 4
Please refer page 25 - 26 for Ref number.
no
Change Fuse
no
1) Check POWER_ON P-on u-com IC401 #pin10
(Refer 1.2 No Power U-Com Failure)
2) Check G* board
no
1.2 No Power U-Com Failure
or
Enable source
SECTION 5
28
SECTION 6
SYS SET