Sony XR-55X90K Service Manual page 45

TROUBLESHOOTING
1.4 NO POWER – Muffin5 Failure
Muffin Fail Suspected
Muffin LOG is Yes
displayed
No
No
Power uCom and
DDCON/LDO OK?
Yes
No
Crystal X1200
Is there 24MHz?
Yes
No
Muffin reset released?
ORESETB=High
Yes
Yes
eMMC clock present?
No
M5 defects
Write DDR check
bootloader
Follow 1.2 & 1.3
Replace crystal
Check Power uCom
Follow 1.2 & 1.3
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
eMMC
data corruption
Replace DDR
eMMC defects
Replace DDR
45
SYS SET