No Power: Ayu2 Failure - Sony KDL-40W900A Service Manual

Troubleshooting

3-1-3. No POWER: Ayu2 Failure

AYU2 Fail Suspected
AYU2 is working,
but specific block fails;
like no picture,
I/O damage etc I/O damage, etc
No
AYU2 LOG is displayed
No No
AYU2 power is OK
No
Software was written Software was written
successful ly
at least one time
No
Replace Ayu2
Yes
See AYU2
replacement flow
Y Yes
Check DDR Find Some
using CheckSW Error message
Yes
DDR device fail DDR d
From the error
Yes
Check
message, we can
DDR & RawNAND
find which device
interface
has failure. has failure.
Move to device
analysis phase.
Yes es
Replace both
AYU2 & RawNAND
No N
Check RawNAND
using CheckSW
No
i f il RawNAND data fail R NAND d t f il
Data fails are
especially in
environment area.
If this Area has If thi A h
broken, check soft
cannot run
Store Error
message.
Yes
Find Some
If it is
Error message
unacceptable
Errors,
No
it is RawNAND
device failure device failure
Store SW log,
Check SW behaviors.
Erase RawNAND Erase RawNAND
In this case,
corrupted data are
written to NAND
flash in proper
way.
So, we have to
check the logs of
exception or errors.
Erase RawNAND Erase RawNAND
Note: Note:
is a last option.
(AYU2) – IC9000
(Brownie)- IC9001
RB1G CHASSIS
W900A/904A/905A
33