Sony TRINITRON KV-21FS150 User manual

TRINITRON®COLOR TELEVISION
SERVICE MANUAL BX-1S CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
9-883-733-01
KV-21FS150 RM-YA005 LATIN NORTH SCC-S79G-A
KV-21FS150 RM-YA005 LATIN SOUTH SCC-S79H-A
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
ORIGINAL MANUAL ISSUE DATE: 2/2007
REVISION DATE SUBJECT
2/2007 No revisions or updates are applicable at this time.

TRINITRON®COLOR TELEVISION
SERVICE MANUAL BX-1S CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
9-883-733-01
KV-21FS150 RM-YA005 LATIN NORTH SCC-S79G-A
KV-21FS150 RM-YA005 LATIN SOUTH SCC-S79H-A
Self Diagnosis
Supported model
KV-21FS150 RM-YA005

KV-21FS150
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3
TABLE OF CONTENTS
SECTION TITLE PAGE
Specifications ....................................................................................................................................................................................................... 4
Warnings and Cautions ........................................................................................................................................................................................ 5
Safety Check-Out ................................................................................................................................................................................................. 6
Self-Diagnostic Function ...................................................................................................................................................................................... 7
SECTION 1: DISASSEMBLY............................................................................................................................................................................................. 9
1-1. Rear Cover Removal.................................................................................................................................................................................... 9
1-2. Chassis Assembly Removal ......................................................................................................................................................................... 9
1-3. Service Position.......................................................................................................................................................................................... 10
1-4. Picture Tube Removal .................................................................................................................................................................................11
Anode Cap Removal Procedure..................................................................................................................................................................11
SECTION 2: SET-UP ADJUSTMENTS............................................................................................................................................................................ 12
2-1. Beam Landing ............................................................................................................................................................................................ 12
2-2. Convergence .............................................................................................................................................................................................. 13
2-3. Focus.......................................................................................................................................................................................................... 14
2-4. Screen (G2)................................................................................................................................................................................................ 15
SECTION 3: CIRCUIT ADJUSTMENTS.......................................................................................................................................................................... 16
3-1. Remote Adjustment Buttons and Indicators ............................................................................................................................................... 16
3-2. Accessing the Service Menu Mode ............................................................................................................................................................ 17
3-3. Confirming Service Adjustment Changes................................................................................................................................................... 18
3-4. White Balance Adjustments........................................................................................................................................................................ 18
3-5. Picture Quality Adjustments ....................................................................................................................................................................... 18
3-6. Service Data............................................................................................................................................................................................... 20
SECTION 4: DIAGRAMS................................................................................................................................................................................................. 29
4-1. Circuit Boards Location .............................................................................................................................................................................. 29
4-2. Printed Wiring Board and Schematic Diagram Information........................................................................................................................ 29
4-3. Block Diagram ............................................................................................................................................................................................ 30
Signal Flow Block Diagram ........................................................................................................................................................................ 30
4-4. Schematics and Supporting Information .................................................................................................................................................... 31
A Board Schematic Diagram (1 of 6) ......................................................................................................................................................... 31
A Board Schematic Diagram (2 of 6) ......................................................................................................................................................... 32
A Board Schematic Diagram (3 of 6) ......................................................................................................................................................... 33
A Board Schematic Diagram (4 of 6) ......................................................................................................................................................... 34
A Board Schematic Diagram (5 of 6) ......................................................................................................................................................... 35
A Board Schematic Diagram (6 of 6) ......................................................................................................................................................... 36
C Board Schematic Diagram ..................................................................................................................................................................... 38
4-5. Semiconductors.......................................................................................................................................................................................... 39
SECTION 5: EXPLODED VIEWS .................................................................................................................................................................................... 40
5-1. Picture Tube, Speakers, and Chassis ........................................................................................................................................................ 40
SECTION 6: ELECTRICAL PARTS LIST........................................................................................................................................................................ 41

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SPECIFICATIONS
1) 1 Vp-p 75 ohms unbalanced, sync negative
2) Y: 1.0 Vp-p, 75 ohms, sync negative; PB: 0.7 Vp-p, 75 ohms;
PR Vp-p, 75 ohms.
3) 500 m Vrms (100% modulation), Impedance: 47 kilohms
Design and specifications are subject to change without notice.
KV-21FS150
Power Requirements 120V, 60Hz
Number of Inputs/Outputs
Video 1) 2
Y,PB, PR
2) 1
Audio 3) 3
VHF/UHF 1
Monitor Output 1
Headphone Output 1
S
p
eaker Out
p
ut
(
W
)
5W x 2
Power Consumption (W)
In Use (Max) 108W
In Standby (Max) 5) <1W
Dimensions (W x H x D)
mm 647 x 469 x 509 mm
in 25 1/2 x 18 7/16 x 20 in
Mass
kg 24.6 kg
lbs 54.23 lbs
Television system
American TV standard, NTSC
Channel coverage
VHF: 2-13/UHF: 14-69/CATV: 1-125
Antenna
Dipole
Picture tube
FD Trinitron®tube
Visible screen size
20-inch picture measured diagonally
Actual screen size
21-inch measured diagonally
Supplied Accessories
Remote Commander RM-YA005
Two Size AA (R6) Batteries
Trademarks and Copyrights
ENERGY STAR®is a registered mark.
Sony, FD Trinitron, WEGA
®
, Steady Sound and Intelligent Picture
are Sony Corporation’s trademarks.

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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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Detected Symptoms
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
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.
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”.
Power does not turn on
+B overcurrent (OCP)*
V-Protect (OVP)
IK (AKB)
Does not light
2 times *
4 times
5 times
2:0
or
2:1 - 255
4:0
or
4:1 - 255
5:0
or
5:1 - 255
• Power cord is not plugged in.
• Fuse is burned out (F600). (A Board)
• H.OUT (Q805) is shorted. (A Board)
• IC751 is shorted. (C Board)
• +13V is not supplied. (A Board)
• IC804 is faulty. (A Board)
• Video OUT (IC1545) is faulty(A Board)
• IC001 is faulty. (A Board)
• Screen (G2) is improperly adjusted.**
No. of Times
STANDBY LED
Indicator Flashes
Diagnostic Item
Description
Self-Diagnositc
Display/
Diagnostic Result
Probable Cause Location
• Power does not come on.
• No power is supplied to the TV.
• AC Power supply is faulty.
• Power does not come 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.
Power Supply
NG (+5V) for
Video Processor
8 times 8:0
or
8:1 - 255
• IC604 is faulty.
• IC602 is faulty.
• No power supply to CRT Anode.
• No RASTER is generated.

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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:
MODEL:
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.
Self-Diagnostic Circuit
A BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC804
V. OUT
A BOARD
IC001
SYSTEM
A BOARD
IC003
MEMORY
IK
FROM
C BOARD
IC751 PIN 5
EHTO
FROM
A BOARD
Q816
COLLECTOR
32 RED-LED
F.B-PLS
V. GUARD
SDAO
SDA
DISPLAY
84 313
122
5
109
+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
Remove 7 screws
+BVTP 4X16
2
Remove rear cover
C Board
Chassis Assembly
2
1
2
A Board
1
3
1
Release power cord.
2
Press on catch tab to release A Board.
3
Gently pull the chassis forward.

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1-3. SERVICE POSITION
1
Press on catch tab to release A Board.
2
Gently pull the A Board forward to access the CN200 connector (to speakers)
3
Disconnect the CN200 from the A Board.
4
Gently continuing pulling the A Board and rotate into service position.
5
Reconnect CN200.
A Board
C Board