Sony TRINITRON KV-XF25M81 User manual

MODEL COMMANDER DEST. CHASSIS NO.
KV-XF25M81 RM-954 ME SCC-U16Y-A
MODEL COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON ® COLOR TV
SERVICE MANUAL BG-3S
Self Diagnosis
Supported model

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KV-XF25M81
RM-954
SPECIFICATIONS
Note
Power requirements 110-240V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, I, D/K, M
Color system PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58
Teletext Language English, Arabic, French
Channel coverage
B/G VHF : E2 to E12 / UHF : E21 to E69
CATV : S01 to S03, S1 to S41
VHF : 0 to 12, 5A, 9A / UHF : 28 to 69 /
CATV : S01 to S03, S1 to S41
( Australia only )
VHF : 1 to 11 / UHF : 21 to 69 /
CATV : S01 to S03, S1 to S41
( New Zealand only )
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 to A13 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 6W + 6W
Number of terminal
(Video) Input: 3 Output: 1 Phono jacks; 1VP-P, 75 ohms
(Audio) Input: 3 Output: 1 Phono jacks; 500 mVrms
(S Video) Input: 2 Y :1 Vp-p, 75 ohms,
unbalanced, sync
negative
C : 0.286 Vp-p, 75 ohms
2(Headphone) Output: 1 Minijack
Picture tube 25 inch
Tube size (cm) 64 Measured diagonally
Screen size (cm) 60 Measured diagonally
Dimension (w/h/d, mm) 722 ×515 ×512
Mass (kg) 38
Design and specifications are subject to change without notice.
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.
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.

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KV-XF25M81
RM-954
TABLE OF CONTENTS
Section Title Page
SELF DIAGNOSIS FUNCTION................................ 4
1. GENERAL........................................................................ 8
2. DISASSEMBLY
2-1. Rear Cover Removal................................................ 23
2-2. ChassisAssy Removal............................................. 23
2-3. F Bracket Removal .................................................. 23
2-4. Service Position ....................................................... 24
2-5. Replacement of Parts ............................................... 24
2-5-1. Replacement of Control Button ....................... 24
2-5-2. Replacement of Light Guide ............................ 24
2-6. Terminal Bracket Removal ...................................... 24
2-7. V1 Board Removal .................................................. 24
2-8. H3 Board Removal .................................................. 25
2-9. A and B3 Boards Removal ...................................... 25
2-10. Picture Tube Removal.............................................. 25
3. SET-UP ADJUSTMENTS
3-1. Beam Landing.......................................................... 27
3-2. Convergence............................................................. 28
3-3. Focus Adjustment .................................................... 30
3-4. G2 (Screen) and White Balance Adjustments......... 31
4. CIRCUIT ADJUSTMENT
4-1. Adjustments with Commander................................ 32
4-2. Adjustment Method ................................................. 33
4-3. Picture Quality Adjustments.................................... 38
4-4. A Board Adjustment After IC003 (Memory)
Replacement............................................................. 38
4-5. Picture Distortion Adjustment ................................. 39
Section Title Page
5. DIAGRAMS
5-1. Block Diagram ......................................................... 41
5-2. Frame Schematic Diagram ...................................... 44
5-3 Circuit Boards Location .......................................... 47
5-4. Schematic Diagrams and Printed Wiring Boards ... 48
(1) Schematic Diagram of A (1/2) Board...................... 51
(2) Schematic Diagrams of A (2/2), B2 and F Boards . 55
(3) Schematic Diagram of C Board .............................. 61
(4) Schematic Diagrams of H3,V1 and VM1 Boards .. 67
(5) Schematic Diagram of B3 Board ............................ 70
5-5. Semiconductors........................................................ 75
6. EXPLODED VIEWS
6-1. Speaker Bracket ....................................................... 78
6-2. Chassis ..................................................................... 79
6-3. Picture Tube ............................................................. 80
7. ELECTRICAL PARTS LIST ...................................... 81

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KV-XF25M81
RM-954
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 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
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
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)
• H.OUT Q511 is shorted. (A
board)
• IC701 is shorted. (C board)
• -13V is not supplied. (A
board)
• IC 503 faulty (A board)
• G2 is improperly adjusted.
(Note 2)
• CRT problem.
• Video OUT IC701 is faulty.
(C board)
• IC301 is faulty. (A board)
• No connection A board to C
board.
• Discharge CRT (C Board)
• Static discharge
• External noise

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KV-XF25M81
RM-954
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. 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.
Lamp ON 0.3 sec. Lamp OFF 3 sec.
Lamp OFF 0.3 sec.
2 times
5 times
STANDBY/SLEEP lamp

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KV-XF25M81
RM-954
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 ScreenTest]
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 (mode volume [+]).
Self-Diagnosis screen display
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.
002 : 000
003 : 000
004 : 000
005 : 001
Numeral "0" means that no fault has been detected.
Numeral "1" means a fault has been detected.
101 : 000
SELF DIAGNOSTIC

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KV-XF25M81
RM-954
6. SELF-DIAGNOSTIC CIRCUIT
[+BovercurrentªOCPº] Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON
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.
[Verticaldeflectionstopped] Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001
shut down the power supply.
[Verticaldeflectionovercurrent] Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be
shut down when detect this by IC001.
[Whitebalancefailure] 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.)
IC301
Y/CHROMA JUNGLE
FROM
CRT
FROM
[+B] Q604 C
[V] Q509/507
IC001
SYSTEM IC003 MEMORY
B-DAT
IO-SDAT
IK-IN
MP/
PROTECT
IO-8DAT
O-LED
SDA
54521
18 51
4635

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KV-XF25M81
RM-954
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts
from the Operating Instruction Manual. The page numbers of
the Operating Instruction Manual remain as in the manual.
2
WARNING
• Dangerously high voltages are present inside the TV.
• Operate the TV only between 110 – 240 V AC.
To prevent fire or shock hazard, do not expose
the TV to rain or moisture.
Do not operate the TV if any liquid or solid object
falls into it. Have it checked immediately by
qualified personnel only.
Do not open the cabinet and the rear cover of the
TV. Refer servicing to qualified personnel.
Do not install the TV in hot, humid or excessively
dusty places.
Do not install the TV in a confined space, such
as a bookcase or built-in cabinet.
Do not block the ventilation openings of the TV.
Do not pull the power cord to disconnect the TV.
Pull it out by the plug.
Disconnect the power cord during lightning
storms or if you are not going to use the TV for
several days.
Install the TV in a stable position. Do not allow
children to climb onto it.
Do not plug in too many appliances to the same
power socket. Do not damage the power cord.
Clean the TV with a dry and soft cloth.
Do not use benzine, thinner, or any other chemicals
to clean the TV. Do not scratch the picture tube.
4
Using Your New TV
VIDEO
VIDEO IN
VIDEO OUT
AUDIO
WOOFER
(8Ω)
Getting Started
Step 1
Connect the antenna
If you wish to connect a VCR, see the “Connecting a VCR” diagram below.
CAUTION
Do not connect the power cord until you have completed making all other
connections; otherwise a minimum leakage current might flow through the antenna
and other terminals to ground.
Connecting a VCR
To watch the video, press …(see page 10).
Using Your New TV
IEC connector
(not supplied)
To video and
audio outputs
VCR
(yellow)
-L (MONO) (white)
-R (red)
To S video
output
Antenna cable (not supplied)
To …1 or 2
(video input)
Audio/Video cable
(not supplied)
S video cable
(not supplied)
: Signal flow
To
(S video input)
To antenna
output
To ˘
(antenna)
or
: Signal flow
Antenna cable (not supplied)
Antenna cable (not supplied)
Rear of TV
Rear of TV

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KV-XF25M81
RM-954
5
Using Your New TV
Using Your New TV
AUTO PROGRAM
PR : 0 1
AUTO
PROGR
1
ONE-PUSH AUTOMATIC PROGRAMMING
ONE-PUSHAUTOMATICPROGRAMMING
TV S YS : AUTO
VHF LOW
PROGR
Notes
• If you connect a monaural VCR, connect the yellow plug to (the yellow
jack) and the black plug to -L (MONO) (the white jack).
• If you connect a VCR to the ˘(antenna) terminal, preset the signal
output from the VCR to the program number 0 on the TV.
• If both (S video input) and …1 (video input) at the rear of your TV
are input at the same time, the (S video input) is automatically
selected. To view …1 (video input), disconnect the S video cable.
• When no signal is input to the connected video equipment, the TV screen
becomes blue.
Step 2
Insert the batteries
into the remote
Note
• Do not use old batteries nor use different types of batteries together.
Step 3
Preset the channels automatically
Tips
• If you want to stop the automatic channel presetting, press MENU twice.
• If your TV has preset an unwanted channel or cannot preset a particular
channel, then preset your TV manually (see page 26 and 27).
Now You Are Ready. . .
To preset the channels manually, see
page 26 and 27.
1
2
Front of TV
7
Using Your New TV
Using Your New TV
WOOFER
(8 )
3
(MONO)
Connecting optional components
You can connect optional audio/video components, such as a VCR, multi disc player,
camcorder, video game or stereo system.
To watch the picture of the connected equipment, press …(see page 10).
Connecting a camcorder/video game equipment
using the …(video input) jacks
Notes
• You can also connect video equipment to the …1 or 2 (video input) jacks
at the rear of your TV.
• If both (S video input) and …3 (video input) at the front of your TV
are input at the same time, the (S video input) is automatically
selected. To view …3 (video input), disconnect the S video cable.
Connecting audio/video equipment using the Ú
(monitor output) jacks
Note
• When connecting a monaural VCR, connect the yellow plug to (the
yellow jack) and the black plug to -L (MONO) (the white jack).
To S video output
Front of TV
Camcorder
Video game
equipment
To video and
audio outputs
(yellow)
-L (MONO)
(white)
-R (red)
Rear of TV
To
antenna
output
To video and
audio inputs
or
Audio system
To
audio
inputs
VCR
:Signal flow
:Signal flow
To
(S video
input)
To … 3
(video input)
To Ú
(monitor
output)
or
Audio/Video cable (not supplied)
S video cable (not supplied)
Antenna cable (not supplied)
Audio/Video cable
(not supplied)
or

– 10 –
KV-XF25M81
RM-954
9
Using Your New TV
Using Your New TV
Watching the TV
This section explains functions used
while watching TV. Most operations can
be done using the remote.
1
Press Uto turn on the TV.
When the TV is in the
standby mode (the u
indicator on the TV is lit
red), press uon the remote
or PROGR +/– on the TV.
2
Press PROGR +/– or
number buttons to select
the TV program.
For double digit numbers,
press ÷, then the number
(e.g., for 25, press ÷, then
2 and 5).
3
Press .+/– to adjust the
volume.
¤
u
…
;
Number buttons
JUMP
.+/–
PROGR +/–
continued
123
456
78
0
-/--
9
1
4
7
-/--
2
5
8
0
3
6
9
FAVORITE
SOUND
MODE
PIC MODE
ENTER
MENU
A/B
SURROUND
MENU
+/–/ENTER
or
u indicator
8
Using Your New TV
20
mm
AB
3.8mm
Securing the TV
To prevent the TV from falling, secure the TV using one of the following methods:
A
With the supplied screws, attach the band to the TV stand and to the rear of
the TV using the provided hole.
B
Put the cord or chain through the clamps to secure the TV against a wall or
pillar.
Note
• Use only the supplied screws. Use of other screws may damage the TV.
or
or