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KDL-32BX355/40BX455/46BX455 ii

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.

An isolation transformer should be used during any service to avoid possible 

shock hazard, in case of live chassis. 

There are critical components used in LCD color TVs that are important for 

safety. These components are identified with shading and 

mark on the 

schematic diagrams and the parts list. It is essential that these critical parts 

be replaced only with the part number specified in the parts list to prevent 

electric shock, fire, or other hazard.

NOTE: Do not modify the original design without obtaining written permission 

from the manufacturer or you will void the original parts and labor warranty.

For safety reasons, component level repair of the Power Supply Boards 

and/or the Inverter Boards is prohibited. 

KDL-32BX355/40BX455/46BX455 iii

 

Disconnect all cables when carrying the TV.

 

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.

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

.

KDL-32BX355/40BX455/46BX455 iv

CAUTION: When cleaning the TV, be sure to unplug the power cord to avoid any chance of electric shock.

 

;

Stubborn stains may be removed with a cloth slightly moistened with a solution of mild soap and warm water.

 

;

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

 

;

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

 

;

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

 

;

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.

 

;

Do Not

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

insecticide. Using any of these harsh cleaners may result in permanent damage to the screen.

 

;

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.

KDL-32BX355/40BX455/46BX455 v

After correcting the original service problem, perform the following safety 

checks before releasing the set to the customer:

1.  Check the area of your repair for unsoldered or poorly soldered 

connections. Check the entire board surface for solder splashes 

and bridges.

2.  Check the interboard wiring to ensure that no wires are “pinched” or 

touching high-wattage resistors.

3.  Check that all control knobs, shields, covers, ground straps, and 

mounting hardware have been replaced. Be absolutely certain that 

you have replaced all the insulators.

4.  Look for unauthorized replacement parts, particularly transistors, 

that were installed during a previous repair. Point them out to the 

customer and recommend their replacement.

5.  Look for parts which, though functioning, show obvious signs of 

deterioration. Point them out to the customer and recommend their 

replacement.

6.  Check the line cords for cracks and abrasion. Recommend the 

replacement of any such line cord to the customer.

7.  Check the antenna terminals, metal trim, “metallized” knobs, 

screws, and all other exposed metal parts for AC leakage. Check 

leakage as described in “Leakage Test”.

The AC leakage from any exposed metal part to earth ground and from all 

exposed metal parts to any exposed metal part having a return to chassis, 

must not exceed 0.5 mA (500 microamperes). Leakage current can be 

measured by any one of three methods.

1.  A commercial leakage tester.  

Follow the manufacturers’ instructions provided with the tester.

2.  A battery-operated AC milliammeter. 

3.  Measuring the voltage drop across a resistor by means of a VOM 

or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so 

analog meters must have an accurate low voltage scale. Nearly all 

battery-operated digital multimeters that have a 2 VAC range are 

suitable. (see Figure A)

Figure A. Use an AC voltmeter to check AC leakage.

The cover-plate retaining screw on most AC outlet boxes is at earth ground. 

Verify the AC outlet box retaining screw ground by connecting a 60W to 

100W incandescent (not a neon or fluorescent lamp) between the hot side of 

the receptacle and the retaining screw. Try both slots, if necessary, to locate 

the hot side on the line; the lamp should light at normal brilliance if the screw 

is at ground potential. (see Figure B)

Figure B. Checking for earth ground.

Trouble Light

AC Outlet Box