DOWNLOAD Sony KDL-65W850A / KDL-65W855A Service Manual ↓ Size: 16.78 MB | Pages: 127 in PDF or view online for FREE

Model
KDL-65W850A KDL-65W855A
Pages
127
Size
16.78 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / COMMON
File
kdl-65w850a-kdl-65w855a.pdf
Date
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Sony KDL-65W850A / KDL-65W855A Service Manual ▷ View online

RB1G
CHASSIS
W850/855A
Troubleshooting
3-1-2.  No POWER:  Ayu2 Control
3 1 2.  No POWER:  Ayu2 Control
No Power
Check STBY_+3.3V
at AYU2
(F11, G11, K13 pin
 C7348)
Look for AC_MON line 
at CN9101 pin2 (except BK*) or 
G-board  / Adapter failure (LW) 
NG
NG
Check AC_MON
at AYU2
(C6 pin 
 R7352)
look for where 
STBY_+3.3V is NG.
 C7348)
Look for MAIN_POWER line 
NG
Check MAIN_PWR
OK
Check STBY_+1.8V
at AYU2
look for where 
OK
NG
_
at CN9101 pin1 (except BK*) 
or replace AYU2
at AYU2
(A9 pin 
 R7344)
OK
(K5, L5, L10, J7 pin 
 C7349)
STBY_+1.8V is NG.
OK
Check STBY_+1.0V
at AYU2
(N13, P13 pin 
 C7350)
look for where
STBY_+1.0V is NG.
G-board  /
Adapter  (LW)
NG
Check REG+12V
at CN9101 pin7
Check REG+19V
9301(
*
)
NG
Check Xtal oscillation
OK
NG
It might be power supply problem
Please refer "DC/DC converter check" sheet
at F9301(BK* only)
OK
Note:
X7302, 32.768KHz
(A7, B7 pin 
 R7386)
Replace X7302 or Ayu2
OK
Please refer  DC/DC converter check  sheet
Or
Check "STBY LED BLINKING"
(*)
Si
B* B
d T
G* B
d T
17
Note: 
(AYU2) – IC9000
(Brownie)- IC9001
Size
B* Board Type G* Board Type
65”
BA2SC G6&G7B
RB1G
CHASSIS
W850/855A
Troubleshooting
Troubleshooting Reference 
Board Name
Board PWB
Detail
BA2-S
(C7348)
(C7349)
(C7350)
(B side)
C7349
(C7350)
C7348
C7350
BA2-S
(R7344)
(R7352)
(A side)
R7386
R7344
Pin 1
Pin 7
(
)
(R7386)
(CN9101)
CN9101
Pin 2
18
R7352
RB1G
CHASSIS
W850/855A
Troubleshooting
AYU2 Fail Suspected
3-1-3.  No POWER:  Ayu2 Failure
AYU2 is working,
but specific block fails;
like no picture, 
I/O damage etc
Yes
See AYU2 
replacement flow
I/O damage, etc
No
Y
Store Error 
message.
N
Find Some
Error message
R
NAND d t f il
AYU2  LOG is displayed
No
Yes
Yes
No
Check RawNAND
using CheckSW
No
If it is 
unacceptable 
Errors,
it is RawNAND
device failure
Check DDR
using CheckSW
Find Some
Error message
DDR d
i
f il
No
Yes
RawNAND data fail
No
Store SW log,
Check SW behaviors.
AYU2  power is OK 
Yes
Check 
DDR & RawNAND
interface
device failure
Data fails are 
especially in 
environment area.
If thi A
h
DDR device fail
Erase RawNAND
From the error 
message, we can 
find which device 
has failure.
Software was written
Yes
No
If this Area has 
broken, check soft 
cannot run
In this case, 
corrupted data are 
written to NAND 
flash in proper 
Erase RawNAND
has failure.
Move to device 
analysis phase.
Software was written
successful ly
at least one time
Replace  both  
AYU2 & RawNAND
No
es
way.
So, we have to 
check the logs of 
exception or errors. 
Erase RawNAND
Note:
19
Replace Ayu2
Erase RawNAND
is a last option.
Note: 
(AYU2) – IC9000
(Brownie)- IC9001
RB1G
CHASSIS
W850/855A
Troubleshooting
AYU2
l
t fl
3-1-4.  No POWER:  Ayu2 Replacement
RawNAND erase
replacement flow
Product SW rewrite
Recover?
Product
SW
iti
i
Yes
Recover?
SW writing issue
No
RawNAND erase
AYU2 replacement
Product SW write
RawNAND replacement 
Product SW write
Recover?
No
Product SW write
Recover?
AYU2 issue
RawNAND issue
Yes
Yes
No
Note:
20
Board issue
No
Note: 
(AYU2) – IC9000
(Brownie)- IC9001
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