Sony A1E Series Service Manual page 23

FLOW
1-3. NO POWER DDCON/LDO
DDCON CHECK
START
Check
no
IC402 Vcc voltage
C423
Is voltage >12V?
yes
Check Vcc voltage
no
C602
Is voltage >4V?
yes
Check Enable
no
IC600 #pin1
Is voltage >2.5V?
yes
Change DDCON
IC601
XBR-55/65/77A1E
Check Vcc voltage Check
no
C602
Is voltage >3V? Is diode alive?
yes
Check
no
D601
Is diode alive?
yes
no
D600
yes
Check +3.3V_STBY.
Check +5V_MAIN DDCON (IC402)
Change IC600
Board
BKA
TROUBLE SHOOTING
Change D600
G* board
Change D601
IC Ref Voltage supply
IC601 +1.5V_DDR
23