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KDL-55BX520 i

Warnings and Cautions - English ...............................................1

Safety-Related Warnings ............................................................ 3

Warnings and Cautions - French ...............................................4
Safety Check-Out .......................................................................7
Self Diagnosis Function ...........................................................10
Overview .................................................................................. 11
Features ................................................................................... 11

Scene Select ..............................................................................11
USB Input ..................................................................................11
LightSensor™ Technology .........................................................11
5 HD Inputs ................................................................................11
BRAVIA® Sync™ Compatible .................................................. 12

Specifications ...........................................................................13

Overview ..................................................................................14
Software Updates for Customers .............................................14
Software Updates for Servicers ...............................................15

Software Update Responsibility ................................................ 15
Checking the Software Version ................................................. 15
Examples of Software Correctable Symptoms ......................... 16

Overview ..................................................................................17
Overall Circuit Description .......................................................18

Main Board ............................................................................... 18
FRC Board ................................................................................ 18
Power Supply ............................................................................ 19
Inverter ...................................................................................... 19
Switch Unit ................................................................................ 19
H Board ..................................................................................... 19

Diagrams ..................................................................................20

Block Diagrams ......................................................................... 20
Connector Diagrams ................................................................. 22

Overview ..................................................................................23

Updating the software ............................................................... 23

Video Failures ..........................................................................23

No Video ................................................................................... 23
Video Distortion ........................................................................ 24

Audio Troubleshooting .............................................................25
Power Supply Troubleshooting ................................................26

Completely Dead Set ................................................................ 26
TV Won’t Power On .................................................................. 26

Backlight Issues .......................................................................26

No Backlight, No Shutdown ...................................................... 26

Protection Shutdown ................................................................27

Standby LED Flash Count ........................................................ 27

KDL-55BX520 ii

Diagnostic Code Descriptions ..................................................29

Viewing the Self Check Diagnostic History ............................... 30
Clearing the Self Check Diagnostic List .................................... 31
Exiting the Self Check Diagnostic Screen ................................ 31

Test Points ...............................................................................31

Video Information .....................................................................32
Power Supply Information ........................................................34
Protection Information ..............................................................35

Table-Top Stand Assembly Removal .......................................37
Rear Cover and Speakers Removal ........................................38
A (Main) Board, G17 (Power Supply) Board  

and LCD Panel Removal .........................................................39

Cleaning the LCD Panel ........................................................... 39

Screw Legend ..........................................................................40
Connectors ...............................................................................40
Accessories and Packaging .....................................................41
Optional Accessories ...............................................................41
Miscellaneous ..........................................................................41
Remote Commander ................................................................41
Wire Dressing ..........................................................................42

Overview ..................................................................................43
Updating the Software .............................................................43
Accessing Service Adjustment Mode .......................................43
Accessing Factory Adjustment Mode .......................................44

Adjusting the Color Temperature .............................................. 45

KDL-55BX520 1

These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing other 

than that contained in the operating instructions unless you are qualified to do so.

• Carry the TV with the adequate number of people; larger size TVs require two or more people.
• Correct hand placement while carrying the TV is very important for safety and to avoid damage.

• Disconnect all cables when carrying the TV.

An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of this receiver is 

directly connected to the AC power line.

Components identified by shading and 

mark on the exploded views are critical for safe operation. 

Replace all components with Sony parts whose part numbers appear as shown in this manual or in supplements published by Sony. It is essential 

that all critical parts be replaced only with the part number specified in this manual to prevent electric shock, fire, or other hazard.
Circuit adjustments that are critical for safe operation are identified in this manual. 
Follow these procedures whenever critical components are replaced or improper operation is suspected. 

NOTE: Do not modify the original design without obtaining written permission from the manufacturer or you will void the original parts and labor 

guarantee.