No Power – Muffin3 Failure; Muffin Fail Suspected - Sony KD-55A9G Service Manual

2019/04/19 01:55:00 (GMT+09:00)
1.4 NO POWER – Muffin3 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
bootloader
No
Follow 1.2&1.3
No
Replace crystal
No
Check Power uCom
Follow 1.2&1.3
Yes
Write DDR check
bootloader
Yes
Is there DDR error?
No
Yes
Check Muffin Log
related to eMMC
Is there "CRC error"
No
Store SW log, check SW
behaviors.
Yes
Is there DDR error?
No
31
eMMC
data corruption
Replace DDR
Replace eMMC
Replace DDR
31
SYS SET