DOWNLOAD Sony KV-TF21M80 (serv.man3) Service Manual ↓ Size: 2.42 MB | Pages: 52 in PDF or view online for FREE

Model
KV-TF21M80 (serv.man3)
Pages
52
Size
2.42 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-tf21m80-sm3.pdf
Date

Sony KV-TF21M80 (serv.man3) Service Manual ▷ View online

 17 
KV
-TF21M80
RM-952
21
Additional Information
ONE-PUSH  AUTOMATIC  PROGRAMING
Additional Information
Self-diagnosis
function
Your TV is equipped with a self-diagnosis function. If there is a
problem with your TV, the u indicator flashes red. The number of
times the u indicator flashes indicates the possible causes.
1
Check that the u indicator flashes red a number of times between 3-second
intervals.
2
Count the number of times the u indicator flashes.
3
Press U (main power) to turn off your TV.
4
Inform your nearest Sony service center about the number of times the
u
 indicator flashes.
Be sure to note the model name and serial number located on the rear of
your TV.
Front of TV
u
 indicator
Additional Information
22
Additional Information
Snowy picture
Noisy sound
Distorted picture
Noisy sound
Good picture
Noisy sound
No picture
No sound
Troubleshooting
If you find any problem while viewing your TV, please check the following guide. If
any problem persists, contact your Sony dealer .
Possible cause
Symptom
Solutions
• Check the antenna cable and connection
on the TV, VCR and on the wall. (page 4)
• Press SELECT until “MANUAL
PROGRAM” appears on the screen then
preset the channel again. (page 10)
• Check the antenna type (VHF/UHF).
Contact a Sony dealer for advice.
• Adjust the antenna direction. Contact a
Sony dealer for advice.
• Try using a booster.
• Turn off or disconnect the booster if it is
in use.
• If the sound of all the channels are noisy,
check the TV system (TV SYS) setting
(page 10), then press AUTO PROGR to
preset the channels again (page 9).
• If the sound of some channels are noisy,
select the channel, then select the
appropriate TV system (TV SYS).
(page 10)
• If the sound of some channels are noisy,
select the channel, then press A/B 
H to
select the main sound. (KV-XF21M93
only) (page 19)
• Check the power cord, antenna and the
VCR connections.
• Press u (power).
• Press U (main power) on the TV to turn
off the TV for about five seconds, then
turn it on again.
• Connection is loose or the
cable is damaged.
• Channel presetting is
inappropriate or
incomplete.
• The antenna type is
inappropriate.
• The antenna direction is
inappropriate.
• Signal transmission is low.
• Broadcast signals are too
strong.
• The TV system setting or
channel presetting is
inappropriate or
incomplete.
• The selected sound is
inappropriate.
• The power cord, antenna
or VCR is not connected.
• The TV is not turned on.
 18 
KV
-TF21M80
RM-952
23
Additional Information
Possible cause
Symptom
Solutions
continued
Good picture
No sound
Dotted lines or stripes
Double images or
“ghosts”
No color
Abnormal color patches
TV cannot receive stereo
broadcast signal
(KV-XF21M93 only)
• Press ¸ + to increase the volume level.
• Press ¤ to cancel the muting.
• Press A/B 
H until a better sound is
heard. (KV-XF21M93 only) (page 19)
• Do not use a hair dryer or other
equipment near the TV.
• Adjust the antenna direction for
minimum interference. Contact a Sony
dealer for advice.
• Use a highly directional antenna.
• Use the fine tuning (FINE) function.
(page 11)
• Adjust the antenna direction. Contact a
Sony dealer for advice.
• Turn off or disconnect the booster if it is
in use.
• Press SELECT until “COLOR” appears
on the screen, then press + or – to adjust
the color level. (page 16)
• Press SELECT until “COL SYS ” appears
on the screen, then check the color
system setting (usually set this to
“AUTO”). (page 11).
• Adjust the antenna direction. Contact a
Sony dealer for advice.
• Keep external speakers or other
electrical equipment away from the TV.
Do not move the TV while the TV is
turned on. Press U  (main power) on
the TV to turn off the TV for about five
minutes, then turn it on again.
• Press A/B 
H until “AUTO” appears
on the screen. (page 19)
• The volume level is too low.
• The sound is muted.
• Broadcast signal has a
transmission problem.
• There is local interference
from cars, neon signs, hair
dryers, power generators,
etc.
• Broadcast signals are
reflected by nearby
mountains or buildings.
• The antenna direction is
inapproprite.
• Use of a booster is
inappropriate.
• The color level setting is
too low.
• The color system setting is
inappropriate.
• The antenna direction is
inapproriate.
• The magnetic disturbance
from external speakers or
other equipment, or the
direction of the earth’s
magnetic field may affect
the TV.
• The stereo reception
setting is inappropriate.
24
Additional Information
Stereo broadcast sound
switches on and off or is
distorted.
or
The sound switches
between monaural and
stereo frequently.
(KV-XF21M93 only)
Picture slant
Lines moving across the
TV screen.
The 
u
 indicator on your
TV flashes red a number
of times between
3-second intervals.
TV cabinet creaks.
A “boom” sound is heard
when the TV is turned on.
Troubleshooting (continued)
Possible cause
Symptom
Solutions
• Check the antenna cable and connection
on the TV, VCR and on the wall. (page 4)
• Adjust the antenna direction. Contact a
Sony dealer for advice.
• Press A/B 
 until a better sound is
heard. (page 19)
• Keep external speakers or other
electrical equipment away from the TV.
• Press SELECT until “PIC ROTATION”
appears on the screen, then press + or –
to align the picture to the TV screen.
(page 13)
• Use the fine tuning (FINE) function.
(page 11)
• Contact your nearest Sony service
center. (page 21)
• Connection is loose or the
cable is damaged.
• The antenna direction is
inappropriate.
• Broadcast signal has a
transmission problem.
• The magnetic disturbance
from external speakers or
other equipment, or the
direction of the earth’s
magnetic field may affect
the TV.
• There is interference from
external sources, e.g.,
heavy machineries, nearby
broadcast station.
•Your TV may need service.
• Changes in room
temperature sometimes
make the TV cabinet
expand or contact, making
a noise. This does not
indicate a malfunction.
• The TV’s demagnetizing
function is working. This
does not indicate a
malfunction.
 19 
KV
-TF21M80
RM-952
25
Additional Information
Identifying parts and controls
Refer to the pages indicated in parentheses ( ) for details.
Front panel
1
U
 (main power) button (12)
2 PROGR +/– (program) buttons (12)
3
¸
 +/– (volume) buttons (12)
4
 (TV/video) button (13)
5 AUTO PROGR (program) button (5)
6 SELECT button (10)
7
2
 (headphone) jack
ONE-PUSH  AUTOMATIC  PROGRAMING
ONE-PUSH  AUTOMATIC  PROGRAMMING
2
26
Additional Information
Button function
For general TV operations
For Teletext operations
Remote Control
9
!™
!∞
TV
1
2
3
4
6
7
8
9
÷
0
5
JUMP
SOUND 
MODE
 
FAVORITE
PROGR
SELECT 
p
PIC MODE 
p
Á
TV
1
2
3
4
6
7
8
9
÷
0
5
JUMP
SOUND 
MODE
 
FAVORITE
PROGR
SELECT 
p
PIC MODE 
p
Á
1 u (power) button (12)
2 ; (TV) button (13)
3 Number buttons (12)
4 JUMP button (13)
5 PROGR +/– buttons (12)
6 SELECT button (10)
7 PIC MODE button (15)
8 +/– buttons (10)
9
(display) button (13)
!º ¤ (muting) button (13)
!¡ … (video) button (13)
!™ . +/– (volume) buttons (12)
!£ A/B button (19)
(KV-XF21M93 only)
!¢ Timer setting buttons (14)
(wake up timer)
(sleep timer)
!∞ FAVORITE button (17)
!§ SOUND MODE button (15)
!¶ Teletext operation buttons
(not used for KV-HF14M80/
TF21M80/XF21M93/XF21M83/
XF21M80)
 (text)
 (enlarge)
 (reveal)
 (hold)
 (index)
 (text clear)
p
 (FASTEXT: red, green, yellow, blue)
1
2
3
4
5
6
7
8
Names/symbols of buttons on the
remote are indicated in different colors
to represent the available functions.
Label color
White
Green
– 20 –
KV
-TF21M80
RM-952
SECTION 2
DISASSEMBLY
2-2. CHASSIS ASSY REMOVAL
2-1. REAR COVER REMOVAL
2-3. F BRACKET REMOVAL
1
 Three connectors
2
 F board
Lever
Six screws
(BVTP 4
×
16)
Rear cover
1
2 Two screws
(BVTP 4
×
16)
1
 Chassis assy
Lever
Lever
2-4. SERVICE POSITION
(Note: Remove F Bracket first.)
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