Sony KD-49X7 D Series Service Manual page 29

1.3 No Power DDCON/LDO
BFM Board Model
IC Ref Voltage supply
IC402 +5.0V_VBUS
IC403 +3.3V_DDC_OUT
IC404 +5V_MAIN
IC405 +1.8V_TU
IC409 +12V_MAIN
(AEP/J AC-ADP only)
IC604 +1.0V_M2
DDCONs check
Please refer page-28 for Ref number.
START
Check fuse
no
F4xx or F6xx
Is fuse OK?
yes
Check Vcc voltage
no
C4xx or C6xx
Is voltage >12.0V?
yes
Check Enable pin
no
voltage
Is voltage >2.5V?
yes
Change DDCON IC
29
Change Fuse
Check POWER_ON P-on ucom #pin19
(Refer 1.2 No Power U-Com Failure)
1.2 No Power U-Com Failure
or
Enable source
29