Sony KDL-40XBR7 Service Manual ▷ View online
9
KDL-40XBR7
KDL-40XBR7
The circuit boards used in these models have been processed using
Lead Free Solder. The boards are identified by the LF logo located
close to the board designation e.g. H1 etc [ see example ]. The
servicing of these boards requires special precautions to be taken as
outlined below.
Lead Free Solder. The boards are identified by the LF logo located
close to the board designation e.g. H1 etc [ see example ]. The
servicing of these boards requires special precautions to be taken as
outlined below.
example 1
It is strongly recommended to use Lead Free Solder material in order to guarantee optimal quality of new solder joints.
Lead Free Solder is available under the following part numbers :
Lead Free Solder is available under the following part numbers :
Due to the higher melting point of Lead Free Solder the soldering iron tip temperature needs to be set to 370 degrees centigrade.
This requires soldering equipment capable of accurate temperature control coupled with a good heat recovery characteristics.
This requires soldering equipment capable of accurate temperature control coupled with a good heat recovery characteristics.
For more information on the use of Lead Free Solder, please refer to http://www.sony-training.com
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10
KDL-40XBR7
KDL-40XBR7
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.
11
KDL-40XBR7
KDL-40XBR7
SELF-DIAGNOSTIC FUNCTION
Self Diagnosis
Supported model
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED indicator 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 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.
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 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.
1. Diagnostic Test Indicators
When an error occurs, the STANDBY LED indicator will fl ash a set number of times to indicate the possible cause of the problem. If there is more than
one error, the indicator will identify the fi rst of the problem areas.
one error, the indicator will identify the fi rst of the problem areas.
Control Buttons
POWER
STANDBY
PIC OFF / TIMER
Description of LED Indictors
Item
Description
Light Sensor
Senses room light level and adjusts the screen brightness
accordingly. Do not put anything near the sensor or the nearby
accordingly. Do not put anything near the sensor or the nearby
general area as its function may be affected.
POWER LED
Lights up in green when the TV is turned on.
STANDBY
LED
LED
Lights up in red when your TV is in PC standby mode. If the
LED blinks in red continuously, this may indicate that the TV
needs servicing.
LED blinks in red continuously, this may indicate that the TV
needs servicing.
PIC OFF/
TIMER LED
TIMER LED
Lights up in green when the
Picture Off
feature is activated.
Lights up in orange when the timer is set. When the timer is
set, this LED will remain lit even if the TV is turned off.
set, this LED will remain lit even if the TV is turned off.
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
12
KDL-40XBR7
KDL-40XBR7
LED Indicators
Diagnostic Item
Description
Number of times
STANDBY lamp
flashes
Possible Location
Main Power
2 times
G6 Board (Power Supply)
DC Alert
3 times
FBU Board
G6 Board (Power Supply)
G6 Board (Power Supply)
Panel Alert
5 times
LCD Panel
Backlight
6 times
D4 Board (Inverter)
G6 Board (Power Supply)
G6 Board (Power Supply)
Panel Temp
7 times
FBU Board
Audio Prot
8 times
AU Board
Fan Error
9 times
Replace Fan
DTT Error
10 times
FBU Board
Backlight Balance
13 times
LCD Panel
Viewing the Self Check Diagnostic List
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 Service Adjustments.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
NOTE: If the Service Menu display text is not completely visible, press the Menu HOME button on the Remote Commander to refresh the display.
SELF CHECK
002 PW-ERR
001
Í 1 indicates an error was detected
003 DC_ALERT1
000
Í 0 indicates no error was detected
005 PANEL_ALERT
000
006 BACKLIGHT
000
007 PANELTEMP
000
008 AUDIO_PROT
000
009 FAN_ERR
000
010 DTT_ERR
000
013 BALANCER
000
101 DTT_WDT
000
*WDT- Watch Dog Timers
102 TVM_WDT
000
*(Watch Dog Timers are used to track
103 BEM_WDT
000
micro processors, not to record errors.)
00016-00013-00016
Ï
ÏÏ Total Panel Hours
Ï
Ï Total Hours of Operation
Ï Boot Count
3. To exit Self Check display, turn the power off.
Clearing the Self Check Diagnostic List
1. In Service Mode, press the Channel 8
Channel
0 .
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