DOWNLOAD Sony KDL-42W850A / KDL-47W850A / KDL-55W850A Service Manual ↓ Size: 53.63 MB | Pages: 127 in PDF or view online for FREE

Name: Sony KDL-42W850A / KDL-47W850A / KDL-55W850A
Brand: Sony
SKU: 15198
Rating: 4 (1 reviews)

kdl-42w850a, kdl-47w850a, kdl-55w850a service manual

Model: KDL-42W850A KDL-47W850A KDL-55W850A
Pages: 127
Size: 53.63 MB
Type: PDF
Document: Service Manual
Brand: Sony
Device: TV
File: kdl-42w850a-kdl-47w850a-kdl-55w850a.pdf
Date: 2018-11-20

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Sony KDL-42W850A / KDL-47W850A / KDL-55W850A Service Manual ▷ View online

RB1G
CHASSIS
W850A
Self Diagnostic Function
2-4. Standby LED Error Display
Note: Details refer to Troubleshooting Section.
Smart Core RED 
LED blinking 
t
Detection Items
Board Error Item
count
2x
Main 12V failure [MAIN_POWE]
* This failure is not saved.
G* Board Error
B* Board Error
Main 5.0/3.3/1.8/1.0/ 1.1V failure [DC_ALERT]
* 5 0/1 0V failures are not saved
B* Board Error
3x
 5.0/1.0V failures are not saved.
Audio amp. protection [AUD_PROT]
B* Board Error

Speaker
HDMI equalizer/switch I2C NACK [HDMI_EQ] * 
There is Temp. sensor on the same I2C bus.
B* Board Error
Tuner or demodulator I2C NACK [TU_DEMOD]
B* Board Error
AFE device I2C NACK [AFE_I2C]
B* Board Error
AFE device error SPI NACK [AFE_SPI] * only 
for AEP,CH
B* Board Error

P
l
d l
5x
Panel ID EEPROM I2C NACK (Also panel power 
failure is a suspect) [P_ID_ERR]

Panel module 

Tcon board
G* Board Error
B* Board Error
6x
Backlight failure [BACKLITE]
G* Board Error

Panel module 
B* Board Error
7x
Over temperature protection [TEMP_ERR]
Temp. sensor I2C NACK [TEMP_ERR] * There is 
HDMI Eq on the  same I2C bus.
B* Board Error
8x
Software Error (Also the main board’s memory or 
B* Board Error
Size
B* Board Type G* Board Type
42”
BA2-S GL2S
(*)
8x
CAM module is a suspect)
B  Board Error
47”
BA2-S
GL2S
55”
BA2-S
GL2E
13

RB1G
CHASSIS
W850A
Self Diagnostic Function
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences
Green 
LED 
Blinking
No
Power
Video
- missing or distorted
Remote
Network
Audio
Skype
Smart Core
Bluetooth 
(BT)
2-5. Triage Chart
Reference 
g
2
3
4
5
6
7
8
10
Green 
LED non-
stop 
Blinking
No White Power 
LED  & does not 
reponse to remote 
(Dead Set)
Stationary 
colored
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
B* Board

















B  Board

















G* Board







H Board (IR)



H Board (SC)




Speaker


Skype Module

Wifi Module



BT M d l
BT Module

LD Board


LVDS FFC




Tcon







LCD Panel







Problem
Power Power
LD
Panel
(Tcon)
Panel
(Backlight)
TEMP
Soft-
ware
Emitter
Audio
FAN
(N/A)
Local
Note: Details refer to Troubleshooting Section.
(*)
I2C
Secondary possible defective part
Most likely defective part
(*)
Size
B* Board Type G* Board Type
42”
BA2-S GL2S
47”
BA2-S
GL2S
55”
BA2-S
GL2E
14

RB1G
CHASSIS
W850A
SECTION 3
TROUBLESHOOTING
3-1.  No Power
No Power
Check STBY 3.3V 
L9101 (B-others)
C9318 (BK*)
G* Board 
Replace
Between G* Board to
B* Board Harness
NG
NG
Harness
OK
OK
B* Board
DC/DC converter check
NO POWER: Ayu2 control
(*)
Size
B* Board Type G* Board Type
42”
BA2-S GL2S
47”
BA2-S
GL2S
15
55”
BA2-S
GL2E

RB1G
CHASSIS
W850A
Troubleshooting Reference 
Troubleshooting
Board 
Name
Board PWB  (A side)
Detail
BA2-S
(L9101)
L9101
BA2-W
(L9101)
L9101
(not applicable for 
(
pp
this model)
BM
(L9101)
(not applicable for
L9101
(not applicable for 
this model)
16

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