DOWNLOAD Sony KDL-55W900A Service Manual ↓ Size: 4.22 MB | Pages: 28 in PDF or view online for FREE

Model
KDL-55W900A
Pages
28
Size
4.22 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kdl-55w900a.pdf
Date
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Sony KDL-55W900A Service Manual ▷ View online

KDL-55W900A 6
SECTION 2 - TROUBLESHOOTING
FLOWCHARTS AND DIAGRAMS
OVERALL BLOCK DIAGRAM
VIDEO 2 CVBS/COMP
VIDEO 1 CVBS
RF
HDMI 1
SWITCH
UNIT
LCD PANEL
HFR
TCON
BA2S
L
R
HEAD PHONES 
OUT
OPTICAL
AUDIO OUT
HDMI 3
IC4601
AMP
IC5500
HDMI
SWITCH
EQ
TUNER
ETHERNET
USB 1
HDMI 2
HDMI 4
LVDS
AC IN
IC9000
A/V 
DECODER
VIDEO 
PROCESS
USB 2
LED BACKLIGHTS
POWER SUPPLY
G1B
SMART CORE
BLUETOOTH
BT
WIFI
IR RX
LED’s
HIR
HSC
USB 3
LOCAL DIMMING
LD
MAIN BOARD
KDL-55W900A 7
SECTION 2 - TROUBLESHOOTING
POWER AND CONTROL BLOCK DIAGRAM
REG12V
GND
GL_CTRL
LD_ERR
1
3
4
5~9
DC_DIMMER
PWM DMMER
BL_ERR
1
3
2
BL_ON
GND
5
7~12
REG12V
STBY3.3V
13~18
21~24
CN6611
CN6401
CN6001
BA2S
G1B
11~14
AC_OFF_DET
POWER_ON
27
28
23
GND
1
3
5
7~12
13~18
21~24
27
28
23
DC_DIMMER
BL_ERR
BL_ON
GND
REG12V
STBY3.3V
AC_OFF_DET
POWER_ON
GND
PWM DIMMER
2
LD
TO LED 
BACKLIGHTS
VLED_VCC
POWER SUPPLY
MAIN BOARD
LOCAL DIMMING
KDL-55W900A 8
SECTION 2 - TROUBLESHOOTING
NO POWER FLOWCHART
No Power
Is Standby LED 
blinking?
No
Yes
No
See Stanby
LED Blinking
Flowchart
Yes
Does red 
Standby LED on 
front panel light?
High (>2.5V)
on Pin 27 of CN6401 
on Power Supply
Board?
Yes
No
Main Board*
Press power button while 
monitoring Pin 28 
of CN6401 on 
Power Supply 
Board.
High (3.3V)
appears 
momentarily?
Yes
No
Power Supply 
Board*
Power Supply 
Board*
Power Supply 
Board*
Remove AC power and 
wait at least 30 
seconds before 
reapplying.
 
*For Part Number information, refer to 
“Section 4 - Exploded View/Part Number Information” on page 18
.
KDL-55W900A 9
SECTION 2 - TROUBLESHOOTING
 
*For Part Number information, refer to 
“Section 4 - Exploded View/Part Number Information” on page 18
.
STANDBY LED BLINKING FLOWCHART
Protect 
Shutdown. 
Standby LED 
Blinking
No
Yes
Power Supply 
Board*
No
Yes
2X
Main Board*
3X
4X
No
Yes
5X
Yes
6X
No
7X
Imediately
LCD Panel*
TCON
(LCD Panel)*
Yes
No
After a while
Check ventilation
10X
HEM3 Board
8X
See Triage Chart 
Main Board*
Power Supply 
Board*
No
Yes
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