Sony FW-43BZ35F Service Manual page 23

1.3 No Power – DDCON/LDO
START
Check IC402 Vcc voltage
C423
Is voltage >12V?
yes
Check Vcc voltage
C602
Is voltage >4V?
yes
no
Is IC600 mounted?
yes
Check Enable
IC600 #pin1
Is voltage >2.5V?
yes
Change DDCON
IC601
DDCON check
no
Check Vcc voltage
C602
Is voltage >3V?
yes
no
Check
D601
Is diode alive?
yes
no
Change IC600
no
Check
D600
Is diode alive?
yes
no
Change D601
Check +5V_MAIN DDCON (IC402)
IC Ref
IC601
no
Change D600
Check +3.3V_STBY.
G* board or IC403
Voltage supply
+1.5V_DDR
23
SYS SET