No Power-Muffin2 Failure - Sony KD-55A9F Service Manual

1.4 NO POWER-Muffin2 Failure

Muffin Fail Suspected
Muffin LOG is
displayed
No
Power uCom and
DDCON/LDO OK?
Yes
Crystal X1200
Is there 24MHz?
Yes
Muffin reset released?
ORESETB=High
Yes
eMMC clock present?
No
Replace Muffin3
Yes
Write DDR check
boot loader
No
Follow 1.2&1.3
No
Replace crystal
No
Check Power uCom
Follow 1.2&1.3
Yes
Write DDR check
boot loader
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
27
SYS SET