Sony KD-55A8F - Slide Number 21

(Supplementary
information)
Check Enable pin
voltage
Is voltage >2.5V?
1.2 No Power U-Com Failure
or
Enable source
Change Fuse
no
no
START
yes
Change DDCON IC
Check fuse
F4xx / F40xx/F6xx
Is fuse OK?
Check Vcc voltage
C4xx / C40xx/C6xx
Is voltage >12.0V?
no
yes
yes
Please refer page-19 for Ref number.
IC Ref Voltage supply
IC402
+5.0V_VBUS/+5V_MAIN
IC403
+3.3V_STBY (AC-ADP only)
/+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
1) Check POWER_ON P-on u-com #pin10
(Refer 1.2 No Power U-Com Failure)
2) Check G* board
BM2A Board Model
1.3 No Power DDCON/LDO
21
21
DDCONs check
SYSSET
2018/03/1622:32:44(GMT+09:00)