Sony KD-49X9 F Series Service Manual page 20

1.3 No Power DDCON/LDO
DDCONs check
IC Ref Voltage supply
IC402 +5.0V_VBUS/+5V_MAIN
+3.3V_STBY
(AC-ADP only)
IC403
/+3.3V_MAIN
Q407 +3.3V_MAIN
IC405 +1.8V_TU
IC601 +1.5V_DDR
IC604 +1.0V_M2
IC4001 +1.5V_BE
IC4002 +1.1V_BE
IC4003 +1.0V_BE
TV Business Division
Please refer page-18 for Ref number.
START
no
Check fuse
F4xx / F40xx/F6xx
Is fuse OK?
yes
Check Vcc voltage no
C4xx / C40xx/C6xx
Is voltage >12.0V?
yes
no
Check Enable pin
voltage
Is voltage >2.5V?
yes
Change DDCON IC
BM2A Board Model
Change Fuse
1) Check POWER_ON P-on u-com #pin10
(Refer 1.2 No Power U-Com Failure)
2) Check G* board
1.2 No Power U-Com Failure
or
Enable source
20
(Supplementary
20
information)