Sony KV-PF21K70 Trinitron Service Manual
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Self Diagnosis
Supported model
SERVICE MANUAL
MODEL COMMANDER DEST. CHASSIS NO.
KV -PF21K70 RM-960 Korea SCC-U35A-A
MODEL COMMANDER DEST. CHASSIS NO.
BG-3S
CHASSIS
MUTING
MTS VIDEO TV
SOUND
MODE
FAVORITE
WAKE UP
SLEEP
CABLE
POWER
DISPLAY
3
1
2
6
4
5
9
7
8
ENT
JUMP
0
CHVOL
SELECT
PIC MODE
ADD/
AUTO
ERASE
PROGRAM
TV
TRINITRON
®
COLOR TV
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KV-PF21K70
RM-960
Power requirements 110-220 V AC, 60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system M
Color system NTSC3.58
Channel coverage VHF : 2 to 13
˘˘
˘ (Antenna) 75-ohm external terminal
˘˘
Audio output 3W
Number of terminal
D (Video) Input : 2 Output : 1 Phono jacks; 1 Vp-p, 75 ohms
≥ (Audio) Input : 2 Output : 1 Phono jacks; 500 mVrms
Picture tube 21 inch
Tube size (cm) 54 Measured diagonally
Screen size (cm) 51 Measured diagonally
Dimension (w/h/d, mm) 490 x 458 x 487
Mass (kg) 25
SPECIFICATIONS
UHF : 14 to 13
CATV : 1 to 125
(Earphone) Output : 1 Minijack
Ø
Note
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.
Design and specifications are subject to change without notice.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON THE
SCHEMA TIC DIA GRAMS, EXPLODED VIEWS AND IN THE P AR TS
LIST ARE CRITICAL TO 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 TO SAFE OPERATION ARE IDENTIFIED IN THIS
MANUAL. FOLLOW THESE PROCEDURES WHENEVER CRITICAL
COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS
SUSPECTED.
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TABLE OF CONTENTS
KV-PF21K70
RM-960
Section Title Page
SELF DIAGNOSIS FUNCTION................................ 4
1. GENERAL .......................................................... 8
2. DISASSEMBLY
2-1. Rear Cover Removal................................................ 18
2-2. Chassis Assy Removal ............................................. 18
2-3. F Bracket Removal .................................................. 18
2-4. Service Position ....................................................... 18
2-5. Replacement of Parts ............................................... 19
2-5-1. Replacement of Control Button ....................... 19
2-5-2. Replacement of Bar Control............................. 19
2-6. Terminal Bracket Removal ...................................... 19
2-7. Degauss Coil Removal............................................. 19
2-8. Picture Tube Removal.............................................. 20
3. SET-UP ADJUSTMENTS
3-1. Beam Landing .......................................................... 21
3-2. Convergence............................................................. 22
3-3. Focus Adjustment .................................................... 24
3-4. G2 (Screen) and White Balance Adjustments......... 24
4. CIRCUIT ADJUSTMENTS
4-1. Adjustments with Commander ................................ 25
4-2. Adjustment Method ................................................. 26
4-3. Picture Quality Adjustments.................................... 31
4-4. A Board Adjustment After IC003 (Memory)
Replacement............................................................. 31
4-5. Picture Distortion Adjustment................................. 32
Section Title Page
5. DIAGRAMS
5-1 Block Diagram ......................................................... 35
5-2 Frame Schematic Diagram ...................................... 38
5-3 Circuit Boards Location .......................................... 40
5-4 Schematic Diagrams and Printed Wiring Boards ... 40
(1) Schematic Diagram of A(1/2) Board....................... 41
(2) Scheamtic Diagram of A(2/2) Board....................... 45
(3) Schematic Diagrams of C3 and VM1 Boards ......... 52
(4) Schematic Diagram of F Board ............................... 57
5-5 Semicondutors ......................................................... 59
6. EXPLODED VIEW
6-1. Chassis ..................................................................... 61
7. ELECTRICAL PARTS LIST................................... 63
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KV-PF21K70
RM-960
SELF DIAGNOSTIC FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER lamp will automatically
begin to flash.
The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER
lamp 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 INDICAT ORS
When an errors occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate the possible cause of the
problem. If there is more than one error, the lamp will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a “0”.
Diagnostic
Item
Description
• Power does not
turn on
• +B overcurrent
(OCP) or
overvoltage
(OVP)
• Vertical deflection
stopped
• Horizontal
deflection
overdrive
• White balance
failure (no
PICTURE)
• Micro reset
No. of times
STANDBY/TIMER
lamp flashes
Does not light
2 times
5 times
—
Self-diagnostic
display/Diagnostic
result
—
002:000 or
002:001~255
003:001~255
004:001~255
at the same time
005:000 or
005:001~225
101:00 or
101:001~225
Probable
Cause
Location
• Power cord is not plugged
in.
• Fuse is burned out F4601
(F Board)
• H.OUT Q511 is shorted.
(A board)
• -13V is not supplied.
(A board)
• IC 503 faulty (A board)
• IC 301 faulty (A board)
• G2 is improperly adjusted.
(Note 2)
• CRT problem.
• IC301 is faulty. (A board)
• No connection A board to
C3 board.
• Discharge CRT
(C3 Board)
• Static discharge
• External noise
Detected
Symptoms
• 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 is shut down shortly,
after this return back to
normal.
• Detect Micro latch up.
Note 1: If a + B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.
The symptom that is diagnosed first by the microcontroller is displayed on the screen.
Note 2: Refer to screen (G2) Adjustment in section 3-4 of this manual.
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2. DISPLA Y OF STANDBY/TIMER LIGHT FLASH COUNT
2 times
5 times
KV-PF21K70
RM-960
Lamp ON 0.3 sec.
Lamp OFF 0.3 sec.
Diagnostic Item Flash Count*
+B overcurrent/overvoltage 2 times
Vertical deflection stopped
White balance failure 5 times
* One flash count is not used for self-diagnostic.
Lamp OFF 3 sec.
STANDBY/SLEEP lamp
3. STOPPING THE STANDBY/TIMER FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER lamp
from flashing.
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KV-PF21K70
RM-960
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 occurances of failure for confirmation on the screen:
[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
[Screendisplay] / channel [5] / Sound volume [-] / Power ON
˘
Note that this differs from entering the service mode (mode volume [+]).
Self-Diagnosis screen display
SELF DIAGNOSTIC
002 : 000
003 : 000
004 : 000
005 : 001
101 : 000
Numeral "0" means that no fault has been detected.
Numeral "1" means a fault has been detected.
5. 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 as shown below when the diagnostic
screen is being displayed.
Channel [8] / 0
[Quitting 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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6. SELF-DIAGNOSTIC CIRCUIT
KV-PF21K70
RM-960
FROM
[+B] Q604 C3
[V] Q509/507
[+BovercurrentªOCPº]
FROM
CRT
IC301
Y/CHROMA JUNGLE
IK-IN
MP/
18 51
PROTECT
SDA
Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON
4635
IC001
SYSTEM
IO-8DAT
O-LED
IO-SDAT
MEMORY
B-DAT
54521
IC003
and the voltage to pin 18 of IC301 should go down when V.SYNC is more than seven
verticals in a period, the unit will automatically turn off.
[Verticaldeflectionstopped] Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001
shut down the power supply.
[Verticaldeflectionovercurrent] Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be
shut down when detect this by IC001.
[Whitebalancefailure] If the RGB levels* do not balance or become low level within 5 seconds, this error will be
detected by IC301. TV will stay on, but there will be no picture.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
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KV-PF21K70
Six screws
(BVTP 4×16)
1
2
Two screws
(BVTP 4×16)
Rear cover
1 Chassis assy
Lever
Lever
1 Three connectors
2 F board
Lever
One screw
(BVTP 4×16)
1
2-1. REAR COVER REMOVAL
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SECTION 2
RM-960
DISASSEMBLY
2-3. F BRACKET REMOVAL
2-2. CHASSIS ASSY REMOVAL
2-4. SERVICE POSITION
(Note: Remove F Bracket first.)
2-5. REPLACEMENT OF PARTS
Multi button
Two screws
(BVTP 3×12)
Bar Optical
One screw
(BVTP 3×12)
A board
Terminal board bracket
One screw
(BVTP 4×16)
1
1 Demagnetization coil
2 Tension spring
Picture tube
For replacement of the Multi Button and Bar Optical ,unscrew to exchange with the
new parts, and fix them with screws (+BVTP) respectively.
2-5-1. REPLACEMENT OF MULTI BUTTON
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2-5-2. REPLACEMENT OF BAR OPTICAL
2-6. TERMINAL BRACKET REMOVAL
2-7. DEGAUSS COIL REMOVAL
KV-PF21K70
RM-960
KV-PF21K70
2 A board
4 C3 board
7 Neck assy
5 Deflection yoke
Cushion
6 Four screws
(Tapping screws)
1 Anode cap
3
F board
Anode button
a
a
b
b
c
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2-8. PICTURE TUBE REMOV AL
NOTE : The picture tube for OCE model is upside down, and the positon for the
anode cap and tension springs are changed accordingly.
•REMOVAL OF ANODE-CAP
NOTE : After removing the anode, short circuit the anode of the picture tube and
the anode cap to the metal chassis, CRT shield or carbon paint on the
CRT.
•REMOVING PROCEDURES
1 Turn up one side of the rubber cap in the direction indicated by the arrow a.
2 Using a thumb pull up the rubber cap firml y in the direction indicated b y the arro w b.
3 When one side of the rubber cap is separated from the anode button, the anode-cap
can be removed by turning up the rubber cap and pulling it up in the direction of the
arrow c.
• HOW TO HANDLE AN ANODE-CAP
1 Do not damage the surface of anode-caps with sharp shaped objects.
2 Do not press the rubber too hard so as not to damage the inside of anode-cap.
A metal fitting called the shatter-hook terminal is built into the rubber.
3 Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage the rubber.
RM-960
SECTION 3
SET-UP ADJUSTMENTS
KV-PF21K70
RM-960
• The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
• These adjustments should be performed with rated power
supply voltage unless otherwise noted.
Controls and switches should be set as follows unless otherwise noted:
PICTURE control........................................................... normal
BRIGHTNESS control................................................... normal
................................................................................................................................................................................................................................
Preparation :
• In order to reduce the influence of geomagnetism on the set's
picture tube, face it east or west.
• Switch on the set's power and degauss with the degausser.
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Note : Test Equipment Required.
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
Purity control
3-1. BEAM LANDING
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Set the pattern generator raster signal to a green raster.
3. Move the deflection yoke to the rear and adjust with the purity
control so that the green is at the center and the blue and the red
take up equally sized areas on each side.
(See Figures 3-1 through 3-3.)
4. Move the deflection yoke forward and adjust so that the entire
screen is green. (See Figure 3-1.)
5. Switch the raster signal to blue, then to red and verify the
condition.
6. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws and DY spacers.
7. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
}
normal
Fig. 3-2
Red
Green
Fig. 3-3
Purity control corrects
this area.
ba
Blue
Disk magnets or rotatable
disk magnets correct
these areas (a-d).
Fig. 3-1
– 21 –
c
Deflection yoke positioning
corrects these areas.
a
d
d
Fig. 3-4
b
c
KV-PF21K70
RM-960
3-2. CONVERGENCE
Preparation :
• Before starting this adjustment, adjust the focus, horizontal size
and vertical size.
• Minimize the brightness setting.
• Provide dot pattern.
(1) Horizontal and Vertical Static Convergence
1 V. STAT
a
b b
a
B
G
R
b
B
G
R
Center dot
R G B
H. STAT VR
R
G
B
V.STAT Magnet
RV 702
C3 board
(Moving vertically), adjust the V.STAT magnet so that the red, green
and blue dots are on top of each other at the center of the screen.
2 H. STAT VR
a
R
G
B
b
R
G
B
3
a
b
a
R
b
B
b
B
GG
R
4 BMC (Hexapole) Magnet.
If the red, green and blue dots are not balanced or aligned, then
use the BMC magnet to adjust in the manner described below.
RG B R G B R GB
V.STAT
V.STAT
BMCPurity
BMC (Hexapole)
Purity
– 22 –
RB
G
RG
GB
RB
(2) Dynamic Convergence Adjustment
Preparation:
• Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence
KV-PF21K70
RM-960
on DY
RB
B
R
TLVYCH
YCH TLV
(3) Screen-corner Convergence
ba
a-d : screen-corner
misconvergence
cd
Fix a Permalloy assy
corresponding to the
misconverged areas
a
d
b
c
a to d : Permalloy assembly
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