Sony X930E Series Service Manual page 24

FLOW
1-3. NO POWER DDCON/LDO
DDCON CHECK
START
Check IC402 Vcc voltage
no
C423
Is voltage >12V?
yes
no
Check Vcc voltage
C602
Is voltage >4V?
yes
Is IC600 mounted?
no
yes
Check Enable
no
IC600 #pin1
Is voltage >2.5V?
yes
Change DDCON
IC601
XBR-55/65X930E, 75X940E
Check Vcc voltage
no
C602
Is voltage >3V? Is diode alive?
yes
Is diode alive?
Check
no
D600
yes
Check no
D601
yes
Check +5V_MAIN DDCON (IC402)
TROUBLE SHOOTING
Change D600
Check +3.3V_STBY.
G* board or IC403
Change D601
Change IC600
IC Ref Voltage supply
IC601 +1.5V_DDR
24