Sony KDL-46W950A / KDL-46W954A / KDL-46W955A / KDL-46W957A / KDL-55W950A / KDL-55W954A / KDL-55W955A / KDL-55W957A Service Manual ▷ View online
RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
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:
33
Board issue
No
Note:
(AYU2) – IC9000
(Brownie)- IC9001
(AYU2) – IC9000
(Brownie)- IC9001
RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
Troubleshooting
3-2. LED Blinking
3-2-1. LED BLINKING 3x (DC Alert, Audio Error & Communication Error)
3-2-1. LED BLINKING 3x (DC Alert, Audio Error & Communication Error)
Size
B*
Board
Type
G*
Board
Type
46”
BM
G3A
3-time blinking
Ch
k D 1 0V t
DC_ALERT
DMD_TU_I2C
or
I2CB bus check:
I2C bus dumping or
TUNER
NG
55”
BM
G3B
Check D+1.0V at
JL9129
on the B* Board
F9105,IC9103,etc
(B* Board)
Speaker
Check
Speaker Impedance
at SP Connector
NG
OK
AUDIO
NG
I2CB bus check:
Probe CL2205,
CL2206
I2C bus dumping or
AYU2
Brownie
OK
Check +3.3V_MAIN_1
at JL9116 on
the B* Board
F9102,IC9102,etc
(B* Board)
Check AUDIO+12.5V
at pin 8/10 of
G* Board
OK
NG
NG
OK
SPIC check
Probe RB8522
SPI dumping
resistor
or AYU2
CN9101 on
the B* Board
G Board
Check +12 5V
OK
OK
OK
I2C_CCP check
R8502 and
R8503
I2C_CCP Pull
U
Check +1.8V_MAIN on
IC9201,etc
NG
Check +12.5V
at Power Amp side
of F4601
on
the B* Board
F4601,IC4601,etc
(B* Board)
NG
OK
(Continue) #2
HDMI
R8503
OK
Up
Pin 2 of IC9201
,
(B* Board)
OK
IC4601,etc
(B* Board)
OK
(Continue) #3
I2CA bus check:
Probe CL5023,
CL5024
I2CA bus
dumping
resistor
or AYU2
NG
NG
Check +5V_MAIN
at JL9132 on
the B* Board
IC9101,etc
(B* Board)
34
OK
RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
Troubleshooting
Troubleshooting Reference
Board Name
Board PWB (A side)
Detail
BA2-S/W
CL2151
CL2152
CL2152
CL2151
BM
CL2151
CL2151
CL2152
CL2152
CL2152
CL2151
35
RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
Troubleshooting
Troubleshooting Reference
Board Name
Board PWB (A side)
Detail
BKX/J
CL2151
CL2152
CL2152
CL2152
BKT(BKE)
CL2151
(
)
CL2151
CL2152
CL2152
CL2151
CL2152
36
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