Sony XR-55A95K Service Manual page 25

TROUBLESHOOTING
1.3 No Power – DDCONs & LDO check
START
no
Check fuse
F4xx / F6xx/F8xx/F48xx
Is fuse, OK?
yes
no
Check VCC voltage
C4xx / C6xx/C8xx/C48xx
Is voltage >12.0V?
yes
no
Check Enable pin
voltage
Is voltage >2.5V?
yes
Change DDCON
or LDO IC
Change Fuse
1) Check POWER_ON P-on u-com IC401 #pin10
(Refer 1.2 No Power U-Com Failure)
2) Check Power board
1.2 No Power U-Com Failure
or
Enable source
Please refer page 23 for Reference Number.
Board Operation IC Ref
BM5S22 DC/DC IC600 or IC610
BM5S22 DC/DC IC601
BM5S22 DC/DC IC804
BM5S22 DC/DC IC807
BM5S22 DC/DC IC808
BM5S22 DC/DC IC810
BM5S21 DC/DC IC811
Board Operation IC Ref
BM5S22 DC/DC IC4800
BM5S22 DC/DC IC4801
BM5S22 DC/DC IC4802
BM5S22 DC/DC IC4803
BM5S22 DC/DC IC4809
BM5S22 DC/DC IC4810
Voltage supply
5V_MAIN/5V_AUDIO
3.3V_MAIN/3.3V_AUDIO
0.8V_M5_CORE
1.8V_M5
1.0V_M5
0.8V_M5_CPU
0.8V_M5_GPU
Voltage supply
1.8V_BE_DDC
1.1V_BE
0.9V_BE_DDC_1
0.9V_BE_DDC_2
0.8V_BE
0.7V_BE
25
SYS SET