Sony KD-55A8F Service Manual page 23

1.4 NO POWER-Muffin2 Failure
Muffin2 Fail Suspected
Muffin2 LOG is
displayed
No
Power uCom and
DDCON/LDO OK?
Yes
Crystal X1000
Is there 24MHz?
Yes
Muffin reset released?
ORESETB=High
Yes
eMMC clock present?
No
Replace Muffin
Yes
Write DDR check
bootloader
No
Follow 1.2&1.3
No
Replace crystal
No Check uCom
Follow 1.2
Yes
Write DDR check
bootloader
Yes
Is there DDR error?
No
Check Muffin Log
related to eMMC
Is there "CRC error"
No
Store SW log, check SW
behaviors.
Yes
Is there DDR error?
No
eMMC
data corruption
Replace DDR
Yes
Replace eMMC
Replace DDR
23
SYS SET