Sony KLV-40SL50A Service Manual ▷ View online
9
KLV-40SL50A
KLV-40SL50A
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-40SL50A
KLV-40SL50A
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.
LED Indicators
PIC OFF / TIMER
STANDBY
POWER
Description of LED Indictors
LED
LED Type
Description
* Lights up in green when the TV set is turned 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 the function PC Power Management
is activated and there is no signal received while in the PC input.
is activated and there is no signal received while in the PC input.
* Lights up in amber when the Timer or Sleep functions are set.
When timer is set, this LED remains lit even
when the TV is turned off.
* Lights up in green when the Backlight feature is activated to Off.
When timer is set, this LED remains lit even
when the TV is turned off.
* Lights up in green when the Backlight feature is activated to Off.
POWER LED
Green or Amber
LED
Green LED
Red LED
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
11
KLV-40SL50A
KLV-40SL50A
POWER/STANDBY LED Diagnostic Description
Diagnostic Item
Description
Number of times
STANDBY lamp flashes
Main Power
2 times
Power Supply (IP1 Board)
DC Alert1
3 times
BM3 (Main) Board
Power Supply (IP1 Board)
Power Supply (IP1 Board)
TCON Error
4 times
LCD Panel
HDMI
5 times
BM3 (Main) Board
Backlight
6 times
LCD Panel
Temp
7 times
BM3 (Main) Board
HFR Error
8 times
LCD Panel
Possible Location
Viewing the Self Check Diagnostic List
1. TV must be in standby mode. (Power off).
1. TV must be in standby mode. (Power off).
Service Mode/Product Information
Version: ER2.6-C121 DTT: S255.P033.S077
Model: 40SL50A
Power on Time: 00000H
Model: 40SL50A
Power on Time: 00000H
Serial : 8000016
Diagnostic Information
2-MAIN POWER:
1
3-DC ALERT1:
0
4-TCON: 0
5-HDMI:
5-HDMI:
0
6-Backlight:
0
7-TEMP: 0
8-HFR:
8-HFR:
0
101-WDT:
0
RETURN
Change Back
Exit
4. To exit Service Mode, press
.
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.
NOTE: This is the same as accessing Service Adjustments.
The
logo displays momentarily, then the Service Mode list
displays.
Service/ADC Auto Calibration
Version: ER2.6-C121 DTT: S255.P033.S077
Model: 40SL50A
Serial : 8000016
Power on Time: 00000H
Model: 40SL50A
Serial : 8000016
Power on Time: 00000H
Diagnostic and Serial Update
ADC Auto Calibration
Clone User Setting
Direct Log to USB
Factory Default
Clone User Setting
Direct Log to USB
Factory Default
RETURN
Change Back
Exit
3. To display the Self Diagnostic list, press
.
1 indicates an error was detected
0 indicates no error was detected
12
KLV-40SL50A
KLV-40SL50A
SECTION 1: DISASSEMBLY
1-2. SWITCH UNIT (HRT1 ASSEMBLY) REMOVAL
1-1. REAR COVER REMOVAL
1 Remove 18 screws from Rear Cover
2 Remove 1 screw from Side Jack position
3 Remove 1 screw from Terminal position
4 Remove 4 screws from Rear Cover
NOTE: The Rear Cover is attached to the Bezel Assembly with three small tabs.
Use caution when removing the Rear Cover not to damage these tabs.
1 Slide out Switch unit from Bezel
2 Disconnect 1 connector from HRT1 Board
1 Screw,
+BVTP2 4X16
2 Screw,
+BVTP 3X12
TYPE IT-3
TYPE IT-3
3 Screw,
+BVTP 3X12
TYPE IT-3
TYPE IT-3
4 Screw,
+PSW M4X12
Rear Cover
Bezel
Tab Inserts
Bezel
Switch Unit (HRT1 Assembly)
1
2
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