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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.

KDL-55BX520 2

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Do Not

 use paper towels, any type of abrasive pad, rags, rubber or vinyl materials to clean the screen. Using these materials could easily 

scratch the screen which may result in permanent damage.
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Do Not

 use any cleaning product containing alkaline/acid cleaner, scouring powder, or volatile solvent, such as alcohol, ammonia,  

  benzene, thinner or insecticide. Using any of these harsh cleaners may result in permanent damage to the screen.
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Do Not 

spray water or detergent directly onto the TV screen . If liquid drips into the bottom of the screen it may cause a failure.

Clean the cabinet of the TV with a dry soft cloth.
Wipe the LCD screen gently with a soft cloth.
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  Stubborn stains may be removed with a cloth slightly moistened with a solution of mild soap and warm water.

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  If using a chemically pretreated cloth, please follow the instruction provided on the package.

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  Never use strong solvents such as a thinner, alcohol or benzine for cleaning. 

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  Periodic vacuuming of the ventilation openings is recommended to ensure to proper ventilation.

KDL-55BX520 3

1.  Do not press on the panel or frame edge to avoid the risk of electric shock.

2.  Do not scratch or press on the panel with any sharp objects.

3.  Do not leave the module in high temperatures or in areas of high humidity for an extended period of time.

4.  Do not expose the LCD panel to direct sunlight.

5.  Avoid contact with water. It may cause a short circuit within the module.

6.  Disconnect the AC power when replacing the backlight or inverter circuit. 

 

(High voltage occurs at the inverter circuit at 650Vrms).

7.  Always clean the LCD panel with a soft cloth material.

8.  Use care when handling the wires or connectors of the inverter circuit. Damaging the wires may cause a short.

9.  Protect the panel from ESD to avoid damaging the electronic circuit (C-MOS).

10. During the repair, 

DO NOT leave the Power On for more than 1 hour while the TV is face down on a cloth

.