Sony KDL-70XBR3 Service Manual ▷ View online
9
KDL-70XBR3
KDL-70XBR3
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
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.
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.
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.
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.
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.
described below.
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.
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.
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.
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).
V, 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).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate
retaining screw on most AC outlet boxes is also at earth ground. If the
retaining screw is to be used as your earth ground, verify that it is at
ground by measuring the resistance between it and a cold-water pipe
with an ohmmeter. The reading should be zero ohms.
A cold-water pipe is a guaranteed earth ground; the cover-plate
retaining screw on most AC outlet boxes is also at earth ground. If the
retaining screw is to be used as your earth ground, verify that it is at
ground by measuring the resistance between it and a cold-water pipe
with an ohmmeter. The reading should be zero ohms.
If a cold-water pipe is not accessible, connect 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 (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).
To Exposed Metal
Parts on Set
Parts on Set
0.15 μF
Earth Ground
AC
Voltmeter
(0.75V)
Voltmeter
(0.75V)
Trouble Light
AC Outlet Box
Ohmmeter
Cold-water Pipe
Figure A. Using an AC voltmeter to check AC leakage.
Figure B. Checking for earth ground.
10
KDL-70XBR3
KDL-70XBR3
SELF-DIAGNOSTIC FUNCTION
Self Diagnosis
Supported model
The unit in this manual contains a self-diagnostic function. If an error occurs, the STANDBY LED will automatically begin to fl ash. The number of times
the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY LED fl ash indicators is listed in the instruction manual for
the user’s knowledge and reference. If an error symptom is diffi cult to reproduced use the Remote Commander to display the record that is stored at
the internal NVM to specify the cause of the failure.
the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY LED fl ash indicators is listed in the instruction manual for
the user’s knowledge and reference. If an error symptom is diffi cult to reproduced use the Remote Commander to display the record that is stored at
the internal NVM to specify the cause of the failure.
Control Buttons
PIC OFF/TIMER
STANDBY
POWER
PIC OFF/TIMER
STANDBY
POWER
Description of LED Indictors
LED
LED Type
Description
* Light is green when the TV set is on
* Functions as service indicator
STANDBY LED
PIC OFF/TIMER
LED
LED
* Light is red when TV is in PC standby mode.
* Light is green when Picture Off is activated
* Light is orange when the timer is set
When timer is set, the LED remains lit even
if the TV is turned off.
* Light is orange when the timer is set
When timer is set, the LED remains lit even
if the TV is turned off.
POWER LED
Green LED
Green LED
Red LED
Display of STANDBY LED Flash Count
*
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
11
KDL-70XBR3
KDL-70XBR3
Diagnostic Test Indicators
When an error occurs, the STANDBY LED will fl ash a set number of times to indicate the possible cause of the problem. If there is more than one
error, the LED will identify the fi rst of the problem areas. If the errors occur simultaneously, the one that corresponds to the fewest fl ashes is identifi ed
fi rst.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “000”.
When an error occurs, the STANDBY LED will fl ash a set number of times to indicate the possible cause of the problem. If there is more than one
error, the LED will identify the fi rst of the problem areas. If the errors occur simultaneously, the one that corresponds to the fewest fl ashes is identifi ed
fi rst.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “000”.
1. TV must be in standby mode. (Power off).
2. Press the following buttons on the Remote Commander within a second of each other:
DISPLAY
Channel
5
Volume
-
TV POWER .
The
Self
Check
list
displays.
This differs from accessing the Service Menu Adjustments.
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12
KDL-70XBR3
KDL-70XBR3
SECTION 1: DISASSEMBLY
1-1. OVERVIEW
The KDL70XBR3 has considerable weight due to its size. The set weighs approximately 205 lbs (93Kg) with
the base stand and approximately 176 lbs (80Kg) without. Please review the following guidelines before
repairing the set.
NEVER lay the set on the LCD Panel for servicing.
A minimum of two people is recommended to service the set if it is already resting on its stand
and four if the set has been mounted on the wall. This is to ensure that care is taken not to torque
the set which could cause a fracture to the panel.
The preferred position for servicing is mounted on its stand.
Use extreme caution whenever moving the set to avoid damaging the LCD panel.
Whenever possible, always keep at least one arm bracket connected when repairing the set.
Use the following instructions when replacing the LVDS cables.
When replacing 1-834-166-11 LEAD WIRE WITH CONNECTOR (LVDS) be sure
the side with the white tape is connected to CN105 on the DEP Board
the side with the white tape is connected to CN105 on the DEP Board
When replacing 1-834-167-11 LEAD WIRE WITH CONNECTOR (LVDS) be sure
the side with the white tape is connected to theTCON Connector on the LCD
panel.
the side with the white tape is connected to theTCON Connector on the LCD
panel.
1-2. LVDS CABLE REMOVAL
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