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XBR-55HX925 7

  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 below.

XBR-55HX925 8

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, such as the Simpson 229 or RCA 

WT-540A. Follow the manufacturers’ instructions to use these 

instructions.

2.  A battery-operated AC milliampmeter. The Data Precision 245 digital 

multimeter is suitable for this job.

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

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

so analog meters must have an accurate low voltage scale. 

The Simpson’s 250 and Sanwa SH-63TRD are examples of 

passive VOMs that are suitable. Nearly all battery-operated digital 

multimeters that have a 2 VAC range are suitable (see Figure A).

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 60-to 100-watt trouble-

light (not a neon 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).

Trouble Light

AC Outlet Box

Figure B. Checking for earth ground.

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

XBR-55HX925 9

The TVs in this manual contain a self-diagnostic function. If an error occurs, the standby LED will automatically begin to flash. The number of 

times the LED flashes translates to a probable source of the problem. A definition of the standby LED flash indicator is listed in the Operating 

Instruction manual for the user’s reference. 
If an error symptom cannot be reproduced, the remote commander can be used to review the failure occurrence data stored in memory to reveal 

past problems and how often these problems occur.
For complete information, refer to 

XBR-55HX925 10

The AZ2-F chassis is one of several designs for the 2011 model line 

of Sony Bravia® LCD televisions. This manual covers the following 

models:
 XBR-55HX925

Several new features are introduced in this chassis model lineup 

along with some carryovers from the previous year.

Enjoy incredible depth and a sharp, Full HD 1080p picture from the 

leader in 3D technology. (3D Active Glasses required, sold separately) 

Experience Sony’s best picture quality and extraordinary contrast 

with full-array local dimming technology. This innovative technology 

consists of an array of LED lights that adjust the bright and dark levels 

in each area of the screen for more precise control of the picture.

Sony’s monolithic design consists of an elegant sheet of glass 

stretching from edge-to-edge. It looks just as good when it’s off as it 

does when it’s on. 

Sony’s exclusive panel technology boosts contrast and brightness, 

making for an enhanced viewing experience. 

Enjoy Sony’s best picture experience no matter what you’re watching. 

Sony’s X-Reality PRO engine brings out incredible detail through 

multi-frame, pixel-by-pixel analysis of each scene. You will see 

optimal color, contrast and sharpness including in low resolution web 

videos.