Sony KDL-55W950B / KDL-55W955B / KDL-55W957B / KDL-65W950B / KDL-65W955B Service Manual ▷ View online
RB2G
CHASSIS
W950B/ W955B/ W957B/ M25B
Reference
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences
No
Power
Video
- missing or distorted
Remote Network
Audio
Skype
Smart
Core
Bluetooth
(BT)
2
3
4
5
6
7
8
9
10
No White
Power LED
& does not
response
to remote
(Dead Set)
Stationary
coloured
lines or
dots
No video
One of
Inputs
No
video
all
Inputs
No
Remote
Wireless
can't
connect
No Audio
Skype
Can't Work
Smart
Core no
LED (Set
is still
alive)
Bluetooth /
One Step
Remote
(OSR) can't
connect
BAX Board
p
l
p
p
l
l
p
p
l
l
p
p
l
p
p
p
TU board
p
p l
p
l
l
p
G* Board
l
p
p
l
l
p
H* Board
l
l
l
Speaker
p
l
Skype
Module
l
Camera
Module
p
Mic.
Module
l
Wifi Module
l
l
p
BT Module
l
LD Board
l
p
LVDS FFC
p
p
p
p
Tcon
p
l
p
p
p
p
LCD Panel
l
l
l
p
l
p
Problem
Power Power
LD
Panel
(Tcon)
Panel
(Backlight) TEMP
Soft-
ware
ware
Emitter
Audio
FAN
(N/A)
Local
I2C
2-5. Triage Chart
Self Diagnostic Function
10
Secondary possible defective part
Most likely defective part
Size
G* Board Type
55”
G1A
65”
G2A
RB2G
CHASSIS
W950B/ W955B/ W957B/ M25B
11
SECTION 3
TROUBLESHOOTING
3-1. NO POWER
Parts
Board PWB (BAX- B side)
Detail
(L9107)
(C9179)
Troubleshooting
3-1-1. NO POWER
3-1-2. NO POWER – AYU2/AYU2L failure
AYU2/L Fail Suspected
Replace BAX Board
No
eMMC /
RawNAND erase
Product SW rewrite
Recover?
Product SW
writing issue
Yes
No Power
Check STBY 3.3V
L9107 or C9179
Harness
G* Board
Replace
Between G* Board to
BAX Board Harness
BAX Board
NG
OK
NG
OK
C9179
L9107
Size
G* Board Type
55”
G1A
65”
G2A
RB2G
CHASSIS
W950B/ W955B/ W957B/ M25B
12
Troubleshooting
3-2-1. LED Blinking: 3x (DC Alert & Communication Error)
3-2. LED BLINKING
Size B* Board G* Board
55”
BAX
G1A
65”
BAX
G2A
Speaker
Check
Speaker Impedance
at SP Connector
Check
Audio +12.5V
at pin 18/20 of CN9101
on the B* Board
(except Adapter
(except Adapter
model)
G* Board
Check
+12.5V / +19.5V
at Power Amp side
of F4401 / F4601 on
the B* Board
F4401 / F4601,
IC4901 / IC4601
,etc
(B* Board)
IC4901 / IC4601,etc
(B* Board)
AUDIO
NG
OK
NG
OK
NG
OK
3-times blinking
Check D+1.0V at
JL9003 / JL9127 on
the B* Board
F9105,IC9103,
Etc (B* Board)
Check
+3.3V_MAIN_1
at JL9117 on
the B* Board
F9104,IC9104,
etc (B* Board)
etc (B* Board)
DC_ALERT
NG
OK
NG
OK
NG
Check
+1.8V_MAIN on
Pin 2 of IC9201
IC9201,etc
(B* Board)
Check
+5.0V_MAIN
at JL9113 / JL9112 on
the B* Board
NG
OK
IC9102 / IC9101
etc (B* Board)
TUNER Board
Change TUS/TUW
Board
OK
NG
RB2G
CHASSIS
W950B/ W955B/ W957B/ M25B
Board Name
Board PWB (A side)
Detail
BAX
(F9104)
(F9104)
BAX
(IC9104)
(IC9104)
BAX
(IC9201)
(IC9201)
BAX
(IC9102)
(IC9102)
13
Troubleshooting
F9104
IC9104
B-Side
IC9201
IC9102
Troubleshooting References (a)
3-2-1. LED Blinking: 3x (DC Alert & Communication Error)
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