Sony XBR-55X900H Service Manual page 30

2020/06/27 06:31:32 (GMT+09:00)
1.4 No Power – Muffin5 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 Muffin5
SECTION 1
S E C T I O N 3
T R O U B L E S H O O T I N G
Yes
Write DDR check
bootloader
No
Follow 1.2&1.3
No
Replace crystal
No
Check Power uCom
Follow 1.2
Yes
Write DDR check
bootloader
SECTION 2 SECTION 3
Is there DDR error?
No
Check Muffin Log
related to eMMC
Is there "CRC error"
No
Store SW log, check SW
behaviors.
Is there DDR error?
No
eMMC
data corruption
SECTION 4 SECTION 5
Yes
Replace DDR
Yes
Replace eMMC
Yes
Replace DDR
SECTION 6
30
SYS SET