Sony Trinitron KV-TF21M80 User manual

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KV-TF21M80 RM-952 India SCC-U22J-A
MODEL COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON ® COLOR TV
SERVICE MANUAL BG-3S
MODEL COMMANDER DEST. CHASSIS NO.

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KV-TF21M80
RM-952
SPECIFICATIONS
CAUTION
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND
THE ANODE CAPTOTHE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ONTHE
SCHEMATIC DIAGRAMS, EXPLODEDVIEWS AND INTHE PARTS
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 THESEPROCEDURES WHENEVER CRITICAL
COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS
SUSPECTED.
Note
Power requirements 110-240V AC, 50/60Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, I, D/K, M
Color system PAL, PAL60, SECAM, NTSC4.43, NTSC3.58
Channel coverage
B/G VHF : E2 to E12/ UHF : E21 to E69
CATV : S01 to S03, S1 to S41
IUHF : B21 to B68/ CATV : S01 to S03, S1 to S41
D/K VHF : C1 to C12, R1 to R12/ UHF : C13 to C57, R21 to R60
CATV : S01 to S03, S1 to S41, Z1 to Z39
MVHF : A2 toA13/ UHF : A14 to A79/
CATV : A-8 to A-2, A to W+4, W+6 to W+84
˘˘
˘˘
˘(Antenna) 75-ohm external terminal
Audio output 3W + 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
2(Headphone) Output : 1 Minijack
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
Design and specifications are subject to change without notice.

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KV-TF21M80
RM-952
TABLE OF CONTENTS
Section Title Page
SELF DIAGNOSIS FUNCTION................................ 4
1. GENERAL .......................................................... 8
2. DISASSEMBLY
2-1. Rear Cover Removal................................................ 20
2-2. Chassis Assy Removal ............................................. 20
2-3. F Bracket Removal .................................................. 20
2-4. Service Position ....................................................... 20
2-5. Replacement of Parts ............................................... 21
2-5-1. Replacement of Control Button ....................... 21
2-5-2. Replacement of Bar Control............................. 21
2-6. Terminal Bracket Removal ...................................... 21
2-7. Degauss Coil Removal............................................. 21
2-8. Picture Tube Removal.............................................. 22
3. SET-UP ADJUSTMENTS
3-1. Beam Landing.......................................................... 23
3-2. Convergence............................................................. 24
3-3. Focus Adjustment .................................................... 26
3-4. G2 (Screen) and White Balance Adjustments ......... 26
4. CIRCUIT ADJUSTMENTS
4-1. Adjustments with Commander ................................ 27
4-2. Adjustment Method ................................................. 28
4-3. Picture Quality Adjustments.................................... 33
4-4. A Board Adjustment After IC003 (Memory)
Replacement............................................................. 33
4-5. Picture Distortion Adjustment ................................. 34
Section Title Page
5. DIAGRAMS
5-1 Block Diagram ......................................................... 37
5-2 Frame Schematic Diagram ...................................... 40
5-3 Circuit Boards Location .......................................... 42
5-4 Schematic Diagrams and Printed Wiring Boards ... 42
(1) Schematic Diagram of A(1/2) Board....................... 43
(2) Scheamtic Diagram of A(2/2) Board....................... 47
(3) Schematic Diagrams of C3 and F Boards ............... 55
5-5 Semiconductors........................................................ 59
6. EXPLODED VIEWS
6-1. Chassis ..................................................................... 61
7. ELECTRICAL PARTS LIST................................... 63

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KV-TF21M80
RM-952
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. DIAGNOSTICTEST INDICATORS
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)
• IC1800 is shorted.
(C3 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.
• Video OUT IC701 is faulty.
(C3 board)
• 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.
SELF DIAGNOSTIC FUNCTION

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KV-TF21M80
RM-952
2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT
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.
3. STOPPINGTHE 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.
STANDBY/SLEEP lamp
Lamp OFF 3 sec.
Lamp OFF 0.3 sec.
Lamp ON 0.3 sec.
2 times
5 times