Sony KLV-37M300A (serv.man2) Service Manual ▷ View online
9
KLV-37M300A
KLV-37M300A
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
KLV-37M300A
KLV-37M300A
SELF-DIAGNOSTIC FUNCTION
Self Diagnosis
Supported model
The units in this manual contain a self-diagnostic function. If an error occurs, the TIMER 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 TIMER 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 TIMER 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 TIMER 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
Description of LED Indictors
LED
LED Type
Description
POWER LED
Green LED
* Light is green when the TV set is on
* Lights is red when the TV is in PC standby mode
* Blinks red when indicating the TV may need servicing
* Light is green when the Picture Off feature is activated
* Light is amber when the timer is set
* Lights is red when the TV is in PC standby mode
* Blinks red when indicating the TV may need servicing
* Light is green when the Picture Off feature is activated
* Light is amber when the timer is set
PIC OFF/TIMER
LED
Amber/Green LED
STANDBY LED
Red LED
Display of TIMER LED Flash Count
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
11
KLV-37M300A
KLV-37M300A
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”
TV
DC_DET
0
DC_ALERT1
0
DC_ALERT2
0
DC_ALERT3
0
BACKLIGHT
0
TEMPERATURE
0
AUDIO
0
DFE
0
B-ENGINE
0
HFR
0
Failure LED Displays
MONITORING ITEMS
NUMBER OF STANDBY LED
(RED) BLINKING TIMES
Main power supply voltage error
2
DC_ALERT 1
3
DC_ALERT 2
4
DC_ALERT 3
5
Backlight error
6
Internal temperature error
7
Audio error
8
Fan error (HFR model only)
9
Digital FE error
10
Trident error
11
*Each of the above blinking is repeated every 2 seconds
LED Displays during Aging
Condition
LED Displays
When AGING_TIMER > 0
Green (0.5 Sec)
t Off (0.5 sec) t Green (0.5 sec) t Off (0.5 sec)
When AGING_TIMER = 0
Green (3.0 sec)
t Off (3.0 sec) t Green (3.0 sec) t Off (3.0 sec)
Clearing the Self Check Diagnostic List
1. In Service Mode, turn the TV off-on.
12
KLV-37M300A
KLV-37M300A
1-1. REAR COVER REMOVAL
SECTION 1: DISASSEMBLY
1 Remove 13 screws from Rear Cover, +BVTP2 4X16
2 Remove 2 screws from Rear Cover arm positions, +PSW M5X16
3 Remove 1 screw from Rear Cover, +BVTP 3X12 TYPE2 IT-3
4 Remove 2 screws from Terminals, +BVTP 3X12 TYPE2 IT-3
2 Remove 2 screws from Rear Cover arm positions, +PSW M5X16
3 Remove 1 screw from Rear Cover, +BVTP 3X12 TYPE2 IT-3
4 Remove 2 screws from Terminals, +BVTP 3X12 TYPE2 IT-3
1-2. VESA ARMS, UNDER COVER AND STAND REMOVAL
1 Remove 2 screws from bottom of VESA Arms, +PSW M5X16
2 Remove 2 screws from Under Cover and Bezel, +BVTP2 4X16
3 Remove 4 screws from Stand and Stand Holder, +PSW M5X12
2 Remove 2 screws from Under Cover and Bezel, +BVTP2 4X16
3 Remove 4 screws from Stand and Stand Holder, +PSW M5X12
4
3
1
2
Bezel
Rear Cover
3
1
2
Bottom Bracket (R)
Bottom Bracket (L)
Top Brackets
Stand Assembly
Under Cover
VESA Arms
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