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Model
KDL-60W840B KDL-60W850B KDL-60W855B KDL-60W857B KDL-70W830B KDL-70W840B KDL-70W850B KDL-70W855B KDL-70W856B KDL-70W857B
Pages
112
Size
15.03 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LEVEL3
File
kdl-60w840b-kdl-60w850b-kdl-60w855b-kdl-60w857b-kd.pdf
Date
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Sony KDL-60W840B / KDL-60W850B / KDL-60W855B / KDL-60W857B / KDL-70W830B / KDL-70W840B / KDL-70W850B / KDL-70W855B / KDL-70W856B / KDL-70W857B Service Manual ▷ View online

Chassis: RB2G, HE-H
Chassis: RB2G, HE-H 
13
RB2G
CHASSIS
W850B
Troubleshooting
3-1-3 NO POWER: Ayu2L control
No Power
Check STBY_+3.3V
at AYU2L
(H15, H16, H17 pin
 C7376
)
Look for AC_MON line 
at CN9101 pin12/C9131 or 
Adapter
/ Gboard failure
NG
NG
Check AC_MON
at AYU2
(C11 pin 
 C7334
)
look for where 
STBY_+3.3V is NG.
OK
OK
Look for MAIN_POWER line 
at CN9101 pin11
or replace AYU2
NG
Check MAIN_PWR
at AYU2
(C13 pin 
 C7315
)
Check STBY_+1.8V
at AYU2L
(H19 pin 
 C7374
)
look for where 
STBY_+1.8V is NG.
OK
NG
Check STBY_+1.0V
at AYU2L
(J15, J16, J17 pin 
 C7380
)
look for where
STBY_+1.0V is NG.
OK
Adapter/
G-board  
NG
Check +19.5V(Adapter)
Or
+12V(G-Board)
at 
CN9101 pin21
OK
NG
Check Xtal oscillation
X7301, 32.768kHz
(A23, B23 pin 
 R7398
)
OK
NG
Replace X7301 or Ayu2L
It might be power supply problem
Please refer "DC/DC converter check" sheet
Or
OK
 R7398
)
OK
Check "STBY LED BLINKING"
Size
B* Board
G* Board
60”
BAXL
G2SB
70”
BAXL
G2SB
 
2.1-3 - No Power: AYU2L Control
RB2G
CHASSIS
W850B
Troubleshooting
3-1-2.  No POWER - DC/DC converter check
START
Check 
C9137 
Voltage.
Ch
k F9101
no
Check 
C9175
Check F9105
no
Is the voltage 5V?
Check 
C9192
Voltage.
Check F9101
Check F9102
yes
no
is it 1.0V?
Check F9105
Check 
C9167
is it 1 15V?
Check F9106
no
Is the voltage 5V?
Check 
C9153
Voltage.
Is the voltage 3 3V?
Check F9104
yes
no
END
yes
is it 1.15V?
Is the voltage 3.3V?
Check 
C9172
Voltage.
Is the voltage 1.5V?
Check F9104
yes
no
yes
Size
B* Board
G* Board
60”
BAXL
G2SB
70”
BAXL
G2SB
Chassis: RB2G, HE-H
Chassis: RB2G, HE-H 
14
 
Troubleshooting References
RB2G
CHASSIS
W850B
Board Name
Board PWB ( A side )
Detail
Troubleshooting References 
Board PWB ( A side )
Detail
BAX-L
1 C7376
1, 3, 4
C7376
2
1. C7376
2. C7374
3. C7380
1, 3, 4
5,6
2
Y
U
2
L
C7380
C7374
4. R7396
5. C7334
6 C7315
A
Y
X7301
6. C7315
R7396
5, 6
C7334
C7334
C7315
BOARD NAME
POWER BOARD (SIDE A)
DETAIL
Chassis: RB2G, HE-H
Chassis: RB2G, HE-H 
15
RB2G
CHASSIS
W850B
Board Name
Board PWB ( A side )
Detail
Troubleshooting References 
Board PWB ( A side )
Detail
BAX-L
1 C7376
1, 3, 4
C7376
2
7. CN9101
1. C7376
2. C7374
3. C7380
1, 3, 4
5,6
2
Y
U
2
L
C7380
C7374
4. R7396
5. C7334
6 C7315
A
Y
X7301
6. C7315
7. CN9101
R7396
5, 6
7. CN9101
C7334
Pin12
C9131
Pin11
Pin21
C7315
 
Troubleshooting References
BOARD NAME
POWER BOARD (SIDE A)
DETAIL
Chassis: RB2G, HE-H
Chassis: RB2G, HE-H 
16
RB2G
CHASSIS
W850B
3-1-4. NO POWER – AYU2/AYU2L failure
AYU2/L Fail Suspected
eMMC / 
RawNAND erase
Product SW rewrite
No
Recover?
Product SW
writing issue
Yes
Check error message
Find Some
Error message
eMMC/ RawNAND
AYU2/L LOG is 
displayed
Yes
Store SW log
Yes
No
Check
eMMC / RawNAND
using CheckSW
No
Check DDR
using CheckSW
Find Some
Error message
No
Yes
g
It is unacceptable
error? 
Erase & Replace
Yes
(1) Check  DDR & 
eMMc / RawNAND
Replace  
AYU2/L or Board
eMMC/ RawNAND
data fail
No
Store SW log,
Check SW 
behaviors.
Yes
Data fails are 
especially in 
environment area
DDR device fail
Erase 
From the error 
message, we can 
find which device 
h
f il
Erase & Replace 
eMMC/ RawNAND
Product SW write
interface OK?
Replace Board
AYU2/L or Board
No
environment area.
If this Area has 
broken, check soft 
cannot run
In this case, corrupted 
data are written to 
eMMC/ NAND flash in 
proper way.
eMMC/ RawNAND
has failure.
Move to device 
analysis phase.
If still NG after SW 
rewrite, please go to (1) 
Check MMC/RawNAND
interface
Replace Board
So, we have to check 
the logs of exception or 
errors. 
Erase eMMC/ 
RawNAND is a last
RawNAND is a last 
option. If still NG after 
erase, please replace 
eMMC/RawNAND
 
2.1-4 - No Power: AYU2 / AYU2L Failure
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