Sony XBR-55X900H Service Manual page 27

2021/04/27 23:25:57 (GMT+09:00)
1.4 No Power – Muffin5 Failure
Muffin Fail Suspected
Power uCom and
DDCON/LDO OK?
Is there 24MHz?
Muffin reset released?
ORESETB=High
eMMC clock present?
Replace Muffin5
SAFETY NOTES
Yes
Muffin LOG is Write DDR check
displayed
No
No
Follow 1.2&1.3
Yes
No
Crystal X1200
Replace crystal
Yes
No
Check Power uCom
Follow 1.2
Yes
Yes
Write DDR check
No
SELF DIAGNOSTIC FUNCTION
T R O U B L E S H O O T I N G
Is there DDR error?
bootloader
Check Muffin Log
Is there "CRC error"
Store SW log, check SW
Is there DDR error?
bootloader
No
eMMC
data corruption
TROUBLESHOOTING SERVICE ADJUSTMENT
Yes
Replace DDR
No
Yes
related to eMMC Replace eMMC
No
behaviors.
Yes
Replace DDR
DIAGRAM
27
HANDLING GUIDE
SYS SET