Sony XBR-55X850D Service Manual page 29

FLOW
1-3. NO POWER DDCON/LDO
Case: BM1 + DPS structure
DDCON check
START
Check IC9001 Vcc voltage
C9033
Is voltage >12V?
yes
Check Vcc voltage
C9061
Is voltage >4V?
yes
Check Enable
IC9010 #pin1
Is voltage >2.5V?
yes
Change DDCON
IC9009
XBR-55X850D/855D/857D, 65X850D/855D/857D, 75X850D/855D/857D
no
Check Vcc voltage
C9061
Is voltage >3V?
yes
no Check
D9001
Is diode ?
yes
no
Change IC9010
no
Check
D9000
Is diode ?
yes
no
Change D9001
Check +5V_MAIN DDCON (IC9001)
TROUBLE SHOOTING
no
Change D9000
Check +3.3V_STBY.
G board or IC408 on DPS
29