Sony KD-49X9 F Series Service Manual page 21

1.3 No Power DDCON/LDO
LDOs check
IC Ref Voltage supply
IC602 +1.05V_M2_STBY
IC603 +1.05V_M2_A_1
IC605 +1.05V_M2_ST_ET
IC606 +1.05V_M2_A_2
VCC3IO_EMMC
IC607
(1.8V)
IC4004 +1.8V_BE
TV Business Division
Please refer page-18 for Ref number.
START
no
Check Vcc voltage
C4xxx or C6xx
Is voltage >3V?
yes
no
Check Enable pin
voltage
Is voltage >3V?
yes
Change LDO IC
BM2A Board Model
Check +3.3V_DDC_OUT
DDCON (IC403)
or
+3.3V_STBY (G* board)
1.2 No Power U-Com Failure
or
Enable source
21
(Supplementary
21
information)