Sony KD-43X85K Service Manual page 26

TROUBLESHOOTING
1.3 No Power DDCON/LDO (DDCON Check)
START
Check fuse
no
F6xx/F8xx
Is fuse OK?
yes
Check Vcc voltage
no
C4xx / C6xx/C8xx
Is voltage >12.0V?
yes
Check Enable pin
no
voltage
Is voltage >2.5V?
yes
Change DDCON 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 24 for Ref number.
Board Operation IC Ref
DC/DC IC414
DC/DC IC600
DC/DC IC607
DC/DC IC804
BM5A
DC/DC IC813
DC/DC IC812
DC/DC IC810
DC/DC IC811
Voltage supply
5.0V_STBY_H
5V_MAIN/5V_AUDIO
3.3V_DDC_OUT
0.8V_M5_CORE
1.8V_M5
1.0V_M5
0.8V_M5_CPU
0.8V_M5_GPU
26
SYS SET