Sony XBR-65Z9D Service Manual page 26

FLOW
1-3. NO POWER DDCON/LDO
LDOs check
START
yes
no
Check Vcc voltage
C4xxx or C6xx
Is voltage >3V?
yes
no
Check Enable pin
voltage
Is voltage >3V?
yes
Change LDO IC
XBR-65Z9D
Check +3.3V_DDC_OUT
DDCON (IC409)
or
+3.3V_STBY (Gx board)
1-2 No Power U-Com Failure
or
Enable source
TROUBLE SHOOTING
26