Sony KLV-40W300A / KLV-46W300A / KLV-52W300A (serv.man3) Service Manual ▷ View online
9
KLV-40W300A/46W300A/52W300A
KLV-40W300A/46W300A/52W300A
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 F
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
KLV-40W300A/46W300A/52W300A
KLV-40W300A/46W300A/52W300A
SELF-DIAGNOSTIC FUNCTION
Self Diagnosis
Supported model
Control Buttons
PIC OFF/TIMER
STANDBY
POWER
Description of LED Indictors
LED
LED Type
Description
* Light when the TV set is on
* If LED blinks continuously, this may indicate
that the TV needs servicing.
that the TV needs servicing.
STANDBY LED
PIC OFF/
TIMER
LED
TIMER
LED
* Lights up in red when TV is in PC standby mode.
* Lights up in green when Picture Off is activated
* Lights up in orange when the timer is set
When timer is set, the LED remains lit even
when the TV is turned off.
* Lights up in orange when the timer is set
When timer is set, the LED remains lit even
when the TV is turned off.
POWER LED
Green or Orange
LED
Green LED
Red LED
11
KLV-40W300A/46W300A/52W300A
KLV-40W300A/46W300A/52W300A
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED automatically begins 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 reproduce use the Remote Commander to display the record that is stored at the
internal NVM to specify the cause.
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 reproduce use the Remote Commander to display the record that is stored at the
internal NVM to specify the cause.
Number of times LED Flash
POW_ERR1
3
times
BACKLITE
6
times
LED ON : 0.3 sec
LED OFF : 0.3sec
LED OFF : 0.3sec
LED OFF
3.0 sec
LED OFF
3.0 sec
Example Diagnosis
- One flash is not used for self-diagnosis.
Diagnostic Indicators
When an error occurs, the STANDBY LED fl ashes 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 “00”)
When an error occurs, the STANDBY LED fl ashes 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 “00”)
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.
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Operating Hours
(max 65535)
(max 65535)
Panel Hours
(max 65535)
(max 65535)
Information Indicator displays time of last 3 events
(Not used in FIX2 models)
(Not used in FIX2 models)
Boot count
(max 65535)
(max 65535)
Resetting the Diagnostic Indicators
After completing the repair of the set, reset the Self Check screen to set all the display results to “00”.
After completing the repair of the set, reset the Self Check screen to set all the display results to “00”.
1. TV must be in standby mode. (Power off).
2. Press DISPLAY
Channel
5
Volume
-
TV POWER .
3. Press Channel 8 , then press Channel 0 . To exit press TV POWER .
12
KLV-40W300A/46W300A/52W300A
KLV-40W300A/46W300A/52W300A
1-1. REAR COVER REMOVAL
SECTION 1: DISASSEMBLY
1 Remove 15 screws from Rear Cover, +BVTP2 4X16 (KLV-40W300A),
Remove 19 screws from Rear Cover, +BVTP2 4X16 (KLV-46W300A/52W300A)
2 Remove 2 screws from Rear Cover arm positions, +PSW M5X12
3 Remove 2 screws from Terminals, +BVTP 3X12 TYPE2 IT-3
1
2
3
Rear Cover
1-2. ARM AND STAND REMOVAL
1 Remove 4 screws from Arms, +PSW M5X8 (KLV-40W300A),
Remove 8 screws from Arms, +PSW M5X8 (KLV-46W300A/52W300A)
2 Remove 4 screws from lower Stays and Stand, +PSW M5X12
1
2
Arm (L)
Arm (R)
Stand Assembly
Stay
Stay
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