DOWNLOAD Sony KV-XF21M80 Service Manual ↓ Size: 1.26 MB | Pages: 46 in PDF or view online for FREE

Model
KV-XF21M80
Pages
46
Size
1.26 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-xf21m80.pdf
Date

Sony KV-XF21M80 Service Manual ▷ View online

– 3 –
KV-XF21M80
RM-952
TABLE OF CONTENTS
Section
Title
Page
SELF DIAGNOSIS FUNCTION
................................
4
1. GENERAL
........................................................................
8
2. DISASSEMBLY
2-1.
Rear Cover Removal ................................................ 19
2-2.
Chassis Assy Removal ............................................. 19
2-3.
F Bracket Removal .................................................. 19
2-4.
Service Position ....................................................... 19
2-5.
Replacement of Parts ............................................... 20
2-5-1.
Replacement of Control Button .......................
20
2-5-2.
Replacement of Light Guide ............................
20
2-6.
Terminal Bracket Removal ...................................... 20
2-7.
Degauss Coil Removal ............................................. 20
2-8.
Picture Tube Removal .............................................. 21
3. SET-UP ADJUSTMENTS
3-1.
Beam Landing .......................................................... 22
3-2.
Convergence ............................................................. 23
3-3.
Focus Adjustment .................................................... 25
3-4.
G2 (Screen) and White Balance Adjustments ......... 25
4. CIRCUIT ADJUSTMENT
4-1.
Adjustments with Commander ................................ 26
4-2.
Adjustment Method ................................................. 27
4-3.
Picture Quality Adjustments .................................... 32
4-4.
A Board Adjustment After IC003 (Memory)
Replacement ............................................................. 32
4-5.
Picture Distortion Adjustment ................................. 33
Section
Title
Page
5. DIAGRAMS
5-1.
Block Diagram ......................................................... 35
5-2.
Frame Schematic Diagram ...................................... 38
5-3
Circuit Boards Location .......................................... 41
5-4.
Schematic Diagrams and Printed Wiring Boards ... 42
(1)
Schematic Diagram of A (1/2) Board ...................... 45
(2)
Schematic Diagrams of A (2/2) and F Boards ........ 49
(3)
Schematic Diagram of C3 Board ............................ 53
(4)
Schematic Diagram of VM1 Board ......................... 56
5-5.
Semiconductors ........................................................ 59
6. EXPLODED VIEW
6-1.
Chassis ..................................................................... 61
7. ELECTRICAL PARTS LIST
....................................... 63
– 4 –
KV-XF21M80
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.
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
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 F3601
(H3)
• 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
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
– 5 –
KV-XF21M80
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.
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
– 6 –
KV-XF21M80
RM-952
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:
[Screen display] /
channel 
[5] /
Sound volume
[-] /
Power ON
˘
Note that this differs from entering the service mode (mode volume 
[+]
).
Self-Diagnosis screen display
002 : 000
003 : 000
004 : 000
005 : 001
Numeral "0" means that no fault has been detected.
Numeral "I" means a fault has been detected.
101 : 000
SELF DIAGNOSTIC
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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Sony KV-XF21M80 Service Manual ▷ Download

  • DOWNLOAD Sony KV-XF21M80 Service Manual ↓ Size: 1.26 MB | Pages: 46 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony KV-XF21M80 in PDF for free, which will help you to disassemble, recover, fix and repair Sony KV-XF21M80 TV. Information contained in Sony KV-XF21M80 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.