Sony KV-29FS140 TRINITRON User manual

TRINITRON®COLOR TELEVISION
SERVICE MANUAL BX-1L CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
9-883-705-01
KV-29FS140 RM-YA005 LATIN NORTH SCC-S79C-A
KV-29FS140 RM-YA005 LATIN SOUTH SCC-S79D-A
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
ORIGINAL MANUAL ISSUE DATE: 4/2006
REVISION DATE SUBJECT
4/2006 No revisions or updates are applicable at this time.

TRINITRON®COLOR TELEVISION
SERVICE MANUAL BX-1L CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
9-883-705-01
KV-29FS140 RM-YA005 LATIN NORTH SCC-S79C-A
KV-29FS140 RM-YA005 LATIN SOUTH SCC-S79D-A
Self Diagnosis
Supported model
KV-29FS140 RM-YA005

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TABLE OF CONTENTS
SECTION TITLE PAGE
Specifications ....................................................................................................................................................................................................... 4
Warnings and Cautions ........................................................................................................................................................................................ 5
Safety Check-Out ................................................................................................................................................................................................. 6
Self-Diagnostic Function ...................................................................................................................................................................................... 7
SECTION 1: DISASSEMBLY........................................................................................................................................................................................... 10
1-1. Rear Cover Removal.................................................................................................................................................................................. 10
1-2. Chassis Assembly Removal ....................................................................................................................................................................... 10
1-3. Service Position...........................................................................................................................................................................................11
1-4. Picture Tube Removal ................................................................................................................................................................................ 12
Anode Cap Removal Procedure................................................................................................................................................................. 12
SECTION 2: SET-UP ADJUSTMENTS............................................................................................................................................................................ 13
2-1. Beam Landing ............................................................................................................................................................................................ 13
2-2. Convergence .............................................................................................................................................................................................. 14
2-3. Focus Adjustment....................................................................................................................................................................................... 15
2-4. Screen (G2)................................................................................................................................................................................................ 16
SECTION 3: CIRCUIT ADJUSTMENTS.......................................................................................................................................................................... 17
3-1. Remote Adjustment Buttons and Indicators ............................................................................................................................................... 17
3-2. Accessing the Service Menu Mode ............................................................................................................................................................ 18
3-3. Confirming Service Adjustment Changes................................................................................................................................................... 18
3-4. White Balance Adjustments........................................................................................................................................................................ 18
3-5. Picture Quality Adjustments ....................................................................................................................................................................... 18
3-6. Service Data............................................................................................................................................................................................... 21
SECTION 4: DIAGRAMS................................................................................................................................................................................................. 30
4-1. Circuit Boards Location .............................................................................................................................................................................. 30
4-2. Printed Wiring Board and Schematic Diagram Information........................................................................................................................ 30
4-3. Block Diagrams and Schematics................................................................................................................................................................ 31
4-4. Schematics and Supporting Information .................................................................................................................................................... 32
A Board Schematic Diagram (1 of 6) ......................................................................................................................................................... 32
A Board Schematic Diagram (2 of 6) ......................................................................................................................................................... 33
A Board Schematic Diagram (3 of 6) ......................................................................................................................................................... 34
A Board Schematic Diagram (4 of 6) ......................................................................................................................................................... 35
A Board Schematic Diagram (5 of 6) ......................................................................................................................................................... 36
A Board Schematic Diagram (6 of 6) ......................................................................................................................................................... 37
CV Board Schematic Diagram ................................................................................................................................................................... 39
H2 Board Schematic Diagram ................................................................................................................................................................... 41
4-5. Semiconductors.......................................................................................................................................................................................... 43
SECTION 5: EXPLODED VIEWS .................................................................................................................................................................................... 44
5-1. Chassis....................................................................................................................................................................................................... 44
5-2. Picture Tube ............................................................................................................................................................................................... 45
SECTION 6: ELECTRICAL PARTS LIST........................................................................................................................................................................ 46

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SPECIFICATIONS
1) 1 Vp-p 75 ohms unbalanced, sync negative
2) Y: 1Vp-p 75 ohms unbalanced, sync negative
C: 0.286 Vp-p (Burst signal), 75 ohms
3) Y: 1.0 Vp-p, 75 ohms, sync negative; PB: 0.7 Vp-p, 75 ohms;
PR Vp-p, 75 ohms.
4) 500 m Vrms (100% modulation), Impedance: 47 kilohms
Design and specifications are subject to change without notice.
Television system
American TV standard, NTSC
Channel coverage
VHF: 2-13/UHF: 14-69/CATV: 1-125
Antenna
75-ohm external antenna terminal for VHF/UHF
Picture tube
FD Trinitron®tube
Visible screen size
27-inch picture measured diagonally
Actual screen size
29-inch measured diagonally
Supplied Accessories
Remote Commander RM-YA005
Two Size AA (R6) Batteries
KV-29FS140
Power Requirements 120V, 60Hz
220V, 50/60Hz (Chile, Perú, Bolivia)
Number of Inputs/Outputs
Video 1) 3
S Video 2) 1
Y,PB, PR
3) 1
Audio 4) 4
VHF/UHF 1
S
p
eaker Out
p
ut
(
W
)
10W x 2
Power Consumption (W)
In Use (Max) 165W
In Standby (Max) 5) <1W
Dimensions (W x H x D)
mm 774 x 590 x 506 mm
in 30 1/2 x 23 1/4 x 20 in
Mass
kg 44 kg
lbs 97 lbs
Trademarks and Copyrights
As an ENERGY STAR® Partner, Sony
Corporation has determined that this
product meets the ENERGY STAR®
guidelines for energy efficiency. ENERGY
STAR® is a U.S. registered mark.
WEGA, FD Trinitron and Steady Sound are registered
trademarks of Sony Corporation.

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WARNINGS AND CAUTIONS
CAUTION
Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield, or carbon painted on the CRT, after
removing the anode.
WARNING!!
An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of this
receiver is directly connected to the AC power line.
!SAFETY-RELATED COMPONENT WARNING!!
Components identified by shading and ! mark on the schematic diagrams, exploded views, and in the parts list are critical for safe
operation. Replace these components with Sony parts whose part numbers appear as shown in this manual or in supplements published
by Sony. Circuit adjustments that are critical for safe operation are identified in this manual. Follow these procedures whenever critical
components are replaced or improper operation is suspected.

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SAFETY CHECK-OUT
After correcting the original service problem, perform the following
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.
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.
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.
5. Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend their
replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the B+ and HV to see if they are specified values. Make sure
your instruments are accurate; be suspicious of your HV meter if
sets always have low HV.
8. Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as 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.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
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).
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.
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).
To Exposed Metal
Parts on Set
0.15 µF 1.5 K ΩAC
Voltmeter
(0.75 V)
Earth Ground
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.

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SELF-DIAGNOSTIC FUNCTION
*One flash count is not used for self-diagnostic.
*If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously. The symptom that is diagnosed first by the mircrocontroller
is displayed on the screen.
**Refer to Screen (G2) Adjustments in Section 2-4. of this manual.
2. Display of STANDBY LED Flash Count
2 times
4 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec. LED OFF
3 sec.
Standby indicator
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 flash. The number of
times the LED flashes translates to a probable source of the problem. A definition of the STANDBY LED flash 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 flash 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 first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
Diagnosis
Item
Description
• No Power
• +B overcurrent
(OCP)
• Vertical NG.
• IK (AKB)
• Supply Voltage
Protection
Detected
Symptoms
•Power does not turn on.
•No power is supplied to the
TV.
•AC power supply is faulty.
•Power does not turn on.
•Load on power line is
shorted.
•Has entered standby state
after horizontal raster.
•Vertical deflection pulse is
stopped.
•Power line is shorted or
power supply is stopped.
•No raster is generated.
•CRT cathode current
detection reference pulse
output is small.
•No power supply to CRT
ANODE.
•No RASTER is generated.
No. of times
STANDBY
Indicator flashes
Does not light
2 times
4 times
5 times
8 times
Diagnostic Result
on screen display
—
2 OCP:0
2 OCP:1 ~ 255
4 VSTOP:0
4 VSTOP:1 ~ 255
5 AKB:0
5 AKB:1 ~ 255
8 SUP:0
8 SUP:1 ~ 255
Probable
Cause
Location
• Power cord is not plugged
in.
• Fuse is burned out (F4101)
(H1 Board)
• H.OUT (Q511) is shorted.
(A board)
• IC751 is shorted.
(C/CV Board)
• +13V is not supplied.
(A Board)
• IC503 voltage list is faulty.
(A Board)
• Video OUT (IC751) is faulty.
(CV Board)
• IC001 is faulty. (A Board)
• Screen (G2) is improperly
adjusted.
• IC604 faulty.
• IC607 faulty.

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3. Stopping the STANDBY LED Indicator Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY LED Indicator from flashing.
4. Self-Diagnostic Screen Display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up past
occurrences of failure on the screen for confirmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
DISPLAY Channel 5 Sound Volume -
POWER
Note that this differs from entering the Service Mode (Sound Volume +).
The following screen will be displayed indicating the error count:
SELF DIAGNOSTIC
2 OCP : 0
3 OVP : N/A
4 VSTOP : 0
Number “0” means that no fault was detected.
5 AKB : 1 Number “1” means a fault was detected one time only.
8 SUP : 0
101 WDT : N/A
SERIAL: FFFFFFF
MODEL: FFFFFFFF
Handling of Self-Diagnostic Screen Display
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you
have completed the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.
Clearing the Result Display
To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
Channel 8
0
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.

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Self-Diagnostic Circuit
A BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC804
V.OUT
A BOARD
IC001
SYSTEM
A BOARD
IC003
MEMORY
FROM
CV BOARD
IC751 PIN 5
IK
EHTO
RED LED
DISPLAY
SDA1
V.GUARD
SDA
5
F.B-PLS 3 1384
32
122
A BOARD
FROM
Q816
COLLECTOR
99
+B overcurrent (OCP)
Occurs when an overcurrent on the +B (135V) line is detected by pin 32 of IC001 (A Board). If the voltage of pin 32 of IC001 (A Board) is more than 4V
when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
V-Protect
Occurs when an absence of the vertical deflection pulse is detected by pin 13 of IC001 (A Board). Power supply will shut down when waveform interval
exceeds 2 seconds.
IK (AKB)
If the RGB levels* do not balance within 15 seconds after the power is turned on, this error will be detected by IC001 (A Board). TV will stay on, but there
will be no picture.
Power Supply NG (+5V) for Video Processor
Occurs when IC001 internal HV protect detects an abnormal H-Pulse (frequency) due to improper power supply to IC001. The TV cuts off high voltage
power of anode CRT. No picture will be detected. eg: faulty IC602 or IC604

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1-1. REAR COVER REMOVAL
SECTION 1: DISASSEMBLY
1-2. CHASSIS ASSEMBLY REMOVAL
1 12 screws +BVTP2 4X16
2Rear cover
1