Sony XR-55A95K Service Manual page 24

TROUBLESHOOTING
1.3 No Power – DDCONs check
START
Check IC600 / IC610
VCC voltage
C601 / C666
no
Is voltage >12V?
yes
Check VCC voltage
no
C801 / CL819
Is voltage >4V?
yes
Check Enable
no
IC800 #pin1 / R803
Is voltage >2.5V?
yes
Change DDCON
IC801 or IC802 or IC803
Check VCC voltage
no
C801 / CL819
Is voltage >3V?
yes
no
Check
D801
Is diode okay?
yes
Change IC800
no
Check
D800
Is diode okay?
yes
Change D801
Check 5V_MAIN DDCON (IC600)
Please refer page 23 for Reference Number.
Board
BM5S22
BM5S22
BM5S22
Change D800
Check 3.3V_STBY.
Power board
Operation IC Ref Voltage supply
DC/DC IC801 1.1V_M5_DDR
DC/DC IC802 0.9V_M5_STBY
DC/DC IC803 1.8V_STBY
24
SYS SET