Sony XBR-55X900C Service Manual page 127

3-2-5. NO POWER: DDCON check
START
Check IC9403 Vcc voltage
C9428
Is voltage >12V?
Yes
Check Vcc voltage
No
C9061
Is voltage >4V?
Yes
Check Enable
IC9010 #pin1
Is voltage >2.5V?
Yes
Change DDCON
IC9009
XBR-55/65X900C, 905C, 907C
Check Vcc voltage
No
No
C9061
Is voltage >3V?
Yes
Check
No
D9001
Is diode ?
Yes
No
Change IC9010
Check
No
D9000
Is diode ?
Yes
Check G board and harness
Change D9001
Check +5V_MAIN DDCON (IC9001)
TROUBLE SHOOTING
Change D9000
127