Sony KV-HW21P20A Service Manual ▷ View online
CHASSIS
TRINITRON
®
COLOR TV
SERVICE MANUAL
BG2T
MODEL
COMMANDER DEST.
CHASSIS NO.
KV-HW21P20A
RM-969
South Africa
TV
1
2
3
4
6
7
8
9
-
0
5
JUMP
SOUND
MODE
SPACE
SOUND
SOUND
PROGR
2
TV
1
2
3
4
6
7
8
9
-
0
5
JUMP
SOUND
MODE
SPACE
SOUND
SOUND
PROGR
2
MODEL
COMMANDER DEST.
CHASSIS NO.
(Silver)
RM 969
(Light Blue)
RM 969
(Light Blue)
– 2 –
KV-HW21P20A
RM-969
TABLE OF CONTENTS
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
! ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN
THE 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.
THE 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.
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.
THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD,
OR CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
SELF DIAGNOSIS FUNCTION ...................................... 3
1. DISASSEMBLY
1-1. Rear Cover Removal ................................................. 6
1-2. Speaker Removal ...................................................... 6
1-3. Chassis Assy Removal .............................................. 6
1-4. Service Position ........................................................ 6
1-5. Terminal Bracket Removal ....................................... 6
1-6. A Board Removal ...................................................... 6
1-7. Picture Tube Removal ............................................... 7
1-2. Speaker Removal ...................................................... 6
1-3. Chassis Assy Removal .............................................. 6
1-4. Service Position ........................................................ 6
1-5. Terminal Bracket Removal ....................................... 6
1-6. A Board Removal ...................................................... 6
1-7. Picture Tube Removal ............................................... 7
2. SET-UP ADJUSTMENTS
2-1. Beam Landing ........................................................... 8
2-2. Convergence .............................................................. 9
2-3. Focus Adjustment .................................................... 11
2-4. G2 (SCREEN) and White Balance Adjustments ... 11
2-2. Convergence .............................................................. 9
2-3. Focus Adjustment .................................................... 11
2-4. G2 (SCREEN) and White Balance Adjustments ... 11
3. CIRCUIT ADJUSTMENTS
3-1. Adjustment With Commander ................................ 12
3-2. Adjustment Method ................................................ 12
3-3. Picture Quality Adjustment .................................... 18
3-4. Deflection Adjustment ............................................ 18
3-5. A Board Adjustment After IC003 (MEMORY)
3-2. Adjustment Method ................................................ 12
3-3. Picture Quality Adjustment .................................... 18
3-4. Deflection Adjustment ............................................ 18
3-5. A Board Adjustment After IC003 (MEMORY)
Replacement ............................................................ 18
3-6. Picture Distortion Adjustment ................................ 19
Section
Title
Page
Section
Title
Page
4. DIAGRAMS
4-1. Block Diagram ........................................................ 20
4-2. Circuit Boards Location .......................................... 22
4-3. Schematic Diagram ................................................. 22
4-2. Circuit Boards Location .......................................... 22
4-3. Schematic Diagram ................................................. 22
(1) A Board Schematic Diagram ............................ 23
(2) C Board Schematic Diagrams ........................... 25
(2) C Board Schematic Diagrams ........................... 25
4-4. Voltage Measurement and Wareforme ................... 26
4-5. Printed Wiring Boards and Parts Location ............. 29
4-6. Semiconductors ....................................................... 32
4-5. Printed Wiring Boards and Parts Location ............. 29
4-6. Semiconductors ....................................................... 32
5. EXPLODED VIEWS
5-1. Picture Tube and Chassis ........................................ 34
6. ELECTRICAL PARTS LIST .................................... 35
OPERATING INSTRUCTIONS
– 3 –
KV-HW21P20A
RM-969
The units in this manual contain a self-diagnosis function. If an error occurs, the STANDBY (1) indicator will automati-
cally begin to flash. A description of the self-diagnosis function is explained in the instruction manual.
The number of times the STANDBY (1) indicator flashes translates to a probable source of the problem. 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.
cally begin to flash. A description of the self-diagnosis function is explained in the instruction manual.
The number of times the STANDBY (1) indicator flashes translates to a probable source of the problem. 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. DIAGNOSIS TEST INDICATORS
When an errors occurs, the STANDBY (1) 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.
problem. If there is more than one error, the indicator will identify the first of the problem areas.
Result for all of the following diagnosis items are displayed on screen. No error has occured if the screen displays a “0”.
Diagnosis
Item
Description
• Power does not
turn on
• +B overcurrent
(OCP)
• Horizontal
deflection
overdrive
overdrive
• White balance
failure (no
PICTURE)
PICTURE)
• Vertical deflection
stopped
• Micro reset
Detected
Symptoms
• Power does not tum on.
• No power is supplied to
• No power is supplied to
the TV.
• AC power supply is faulty.
• Power does not tum on.
• Load on power line is
• Load on power line is
shorted.
• Has entered standby state
after horizontal raster.
• Power line is shorted or
power supply is stopped.
• Vertical deflection pulse
is stopped
• Power is shut down
shortly, after this return
back to normal.
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 DIAGNOSIS FUNCTION
No. of times
STANDBY (1)
indicator flashes
Does not light
2 times
4 times
—
Self-diagnostic
display/Diagnosis
result
—
002:000 or
002:001~255
004:000 or
004:001~225
101:00 or
101:001~225
Probable
Cause
Location
• Power cord is not
plugged in.
• Fuse is burned out
F600 (F)
• H.OUT Q801 is shorted.
(A board)
• -13V is not supplied.
(A board)
• IC 551 faulty (A board)
• Discharge CRT
(C Board)
• Static discharge
• External noise
• External noise
– 4 –
KV-HW21P20A
RM-969
2. DISPLAY OF STANDBY (1) INDICATOR FLASH COUNT
3. STOPPING THE STANDBY (1) INDICATOR FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY (1)
indicator from flashing.
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 con-
firmed, it is possible to bring up past occurances of failure for confirmation on the screen:
firmed, 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:
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
[Screen display] / channel [5] / Sound volume [-] / Power ON
˘
Note that this differs from entering the service mode (volume [+]).
Self-Diagnostic screen display
Lamp ON 0.3 sec.
Lamp OFF 3 sec.
Lamp OFF 0.3 sec.
2 times
4 times
Diagnosis Item
Flash Count*
+B overcurrent/overvoltage
2 times
Vertical deflection stopped
4 times
* One flash count is not used for self-diagnosis.
002 : 000
004 : 000
004 : 000
Numeral "0" means that no fault has been detected.
101 : 000
SELF DIAGNOSTIC
STANDBY (1) indicator