Sony KDL-55HX827 Service Manual ▷ View online
KDL-55HX827 7
SECTION 1 - SAFETY AND FEATURES
SAFETY CHECK-OUT
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.
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SECTION 1 - SAFETY AND FEATURES
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, 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 0.75 V, so
analog meters must have an accurate low voltage scale.
HOW TO FIND A GOOD EARTH GROUND
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.
To Exposed Metal
Parts on Set
0.15 µF
Earth Ground
AC
Voltmeter
(0.75V)
Figure A. Using an AC voltmeter to check AC leakage.
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SECTION 1 - SAFETY AND FEATURES
SELF DIAGNOSIS FUNCTION
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
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
For complete information, refer to
“Section 4 - Troubleshooting” on page 27.
Self Diagnosis
Supported model
KDL-55HX827 10
SECTION 1 - SAFETY AND FEATURES
OVERVIEW
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:
KDL-55HX827
KDL-55HX827
FEATURES
Several new features are introduced in this chassis model lineup
along with some carryovers from the previous year.
SEE IT ALL IN 3D
Enjoy incredible depth and a sharp, Full HD 1080p picture from
the leader in 3D technology. Plus easy set up with built-in 3D sync
transmitter. (3D Active Glasses required, sold separately).
DYNAMIC EDGE LED BACKLIGHT
Experience enhanced picture quality and contrast with local
dimming technology. It sharpens image contrast giving an amazingly
crisp picture you can see. The backlight system allows for a more
environmentally friendly television than traditional CCFL-tube TVs.
SLEEK DESIGN
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.
OPTICONTRAST™ PANEL
Sony’s exclusive panel technology boosts contrast and brightness,
making for an enhanced viewing experience.
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