Haier 21F3A-T User manual

21F3A-T
COLOUR TELEVISION
Service Manual
MODEL :
21F3A-T
(THAILAND)
■Features
 54cm pure flat picture tube
 Auto search 218 program presetting and memory
 Child lock & on screen help function
Haier Group
NO:M-AS-TH-21T3A-T-8823
Edition:2003/3/1

CONTENTS
CONTENTS
1 Product Code illumination and Series Introduction --------------------2
2 Features --------------------------------------------------------------------------------3
3 Specifications-------------------------------------------------------------------------4
4 Safety Precautions-------------------------------------------------------------------5
5 Warning and Cautions--------------------------------------------------------------6
6 Net dimension------------------------------------------------------------------------12
7 Parts and Functions----------------------------------------------------------------13
8 Remote Controller Functions----------------------------------------------------14
9 Program Diagram--------------------------------------------------------------------15
10 Maintenance Service and Trouble shooting--------------------------------16
11 Circuit Diagram-----------------------------------------------------------------------22
12 Circuit Explanation------------------------------------------------------------------23
13 Adjustment-----------------------------------------------------------------------------28
14 Exploded View-------------------------------------------------------------------------34
15 List of Parts-----------------------------------------------------------------------------35
16 Damageable Parts List--------------------------------------------------------------45
17 Information of Resistors and Capacitors-------------------------------------46
1

1. Product Code illumination and Series Introduction
21 F3A – T
Compony of Signal processor IC T:Toshiba
Product Code illumination and Series Introduction
CRT size(unit:inch)
Type of CRT F:pure flat
Model series of cabinet mumber
2

2. Features
MODEL
21F3A-T MODEL 21F3A-T
NO. ITEM FUNCTION Thailand NO. ITEM FUNCTION Thailand
1Main IC 8823 24 Digital curtain √
2CRT pure flat 25 Slow fading on & off √
3Color system PAL NTSC 26 Semitransparent menu √
4Audio system B/G 27
N
on-flshing channel changing √
5
N
O.of channels 218 28 ZOOM ×
6OSD language Thailand 29 16:9 mode ×
7
PICTURE
Multi-picture modes 5 30 Games marine game
8AV stereo ×31 Calendar √
9Super woofer ×32 Child-lock √
10 Surrounding sound ×33 Multi-functional lock √
11 Treble/bass boost ×34
N
o-picture listening √
12 Left/right balancer ×35 Background light √
13
N
ICAM ×36 Auto-timer on √
14 Multi-audio modes ×37 CCD ×
15 Tone adjuster ×38
SOFTWARE
V-CHIP ×
16 MTS/SAP ×39
N
O. of buil
t
-in speakers 2
17
AUDIO
Auto-volume leveling ×40 Audio output power(W) 3
18 AV input back 1,side1 41 Total power input（W）70
19 AV output back 1 42 Voltage range（V）220
20 DVD terminal back 1 43 Power frequency（Hz）50
21 S-video jack back 1 44 Time of sleep timer(MINS) 120
22 Headphone socket side 1 45
N
et weight(KG) 24
23
JACK
SCART socket ×46 Gross weight(KG) 26
47
N
et dimension(MM) 576×395×458
48 Packaged dimension(MM) 650×565×525
49 Quantity for 20' container ×
50 Quantity for 40' container ×
51
PARAMETE
R
Quantiry for 40' high container ×
Features
FUNCTIONS :
1.ALL-BAND CATV (470MHz) 2.I2C bus control
3.Auto and manual tuning 4.Audio/video input/output interfaces
5.Multiple picture modes selection 6.Screen saver when no signal
7.Sliding color bar 8.218 programs Preset
9.volume setting stored 10.Program scan
11.Childhold 12.Slidecurtainpoweron/offdisplay，improved eye protection
3

Specifications
3. Specifications
 POWER SUPPLY: AC 220V, 50 Hz
 Tuning system: voltage synthesized type auto-search fine tuning system
 IF: 38.9MHz
 Power consumption: 70W
 Antenna input impedance: 75Ω
 Receiving system:
a) Color system: PAL/NTSC3.58MHz/4.43MHz
b) Broadcast TV system: B/G
 Language displayed: THAILAND
 Video input: 1.0VP-P (75Ω)
 Audio input: 436m Vrms (40KΩ)
4

4.Safety Precautions
IMPORTANT SAFETY NOTICE
Many electrical identify these parts and mechanical parts in this chassis have special
safety-related characteristics! In the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of the manufacturer.
General Guidance
An Isolation Transformer should always be used during the servicing of a receiver whose
chassis is not isolated from the AC power line. Use a transformer of adequate power rating as
this protects the technician from accidents that might result in personal injury caused by
electrical shocks.
It will also protect the receiver and it’s components from being damaged by accidental shorts of
the circuitry that might be inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with a specified one.
When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor
10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to the high vacuum and large surface area of the picture tube, extreme care should be
taken in handling the Picture Tube. Do not lift the Picture Tube by its Neck.
X-RAY Radiation
Warning:
The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the
Picture Tube.
For continued X-RAY RADIATION protection, the replacement tube must be of the same type
as specified in the Replacement Parts List.
Before returning the receiver to the customer,
Always perform an AC leakage current check on the exposed metallic parts of the cabinet,
such as antennas, terminals, etc., to make sure that the set is safe to operate without any
danger of electrical shock.
Safety Precautions
Safety Precautions
5

Warning and Cautions
5. Warning and Cautions
1. When you clean the TV set, please pull
out the power plug from AC outlet. Don't
clean the cabinet and the screen with
benzene,petrolandotherchemicals.
4. To prevent the TV set from firing and
electricshock,don't
maketheTVsetrain
ormoisture.
2. In order to prolong the using life of the
TV set, please place it on a ventilated
place.
5.Don'topenthebackcover,otherwiseitis
possibletodamagethecomponentsinthe
TVsetandharmyou.
3. Don't place the
TV set in the
sunshine or near
heatsource.
6. When the TV set isn't going to be used
for long time or it is in thunder and
lightening,pleasepullouttheplugfromAC
outlet and theantennaplugfromthe cover
oftheTVset.
Explanation on the display tube
Generally, it is not needed to clean the tube surface. However, if necessary,its surface can be
cleaned with a dry cotton cloth after cutting off the power.Don't use any cleanser. If using hard
cloth, the tube surface will be damaged.
CAUTION: Before servicing receivers covered by this service manual and its supplements and
addenda, read and follow the SAFETY PRECAUTIONS.
6
NOTE: If unforeseen circumstances create conflict between the following servicing precautions
and any of the safety precautions, always follow the safety precautions. Remember: Safety
First.

Warning and Cautions
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power source before:
a. Removing or reinstalling any component, circuit board module or any other assembly
of the receiver.
b. Disconnecting or reconnecting any receiver electrical plug or other electrical
connection.
c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver.
CAUTION: A wrong substitution part or incorrect installation polarity of electrolytic
capacitors may result in an explosion hazard.
d. Discharging the picture tube anode.
2. Test high voltage only by measuring it with an appropriate high voltage meter or other
voltage-measuring device (DVM, FETVOM, etc.) equipped with a suitable high voltage
probe. Do not test high voltage by “drawing an arc”.
3. Discharge the picture tube anode only by (a) first connecting one end of an insulated clip
lead to the degaussing or kine aquadag grounding system shield at the point where the
picture tube socket ground lead is connected, and then (b) touch the other end of the
insulated clip lead to the picture tube anode button, using an insulating handle to avoid
personal contact with high voltage.
4. Do not spray chemicals on or near this receiver or any of its assemblies.
5. Unless specified otherwise in this service manual, clean electrical contacts only by applying
the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable
nonabrasive applicator; 10% (by volume) Acetone and 90% (by volume) isopropyl alcohol
(90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of contacts is not required.
6. Do not defeat any plug / socket B+ voltage interlocks with which receivers covered by this
service manual might be equipped.
7. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all
solid-state device heat sinks are correctly installed.
8. Always connect the test receiver ground lead to the receiver chassis ground before
connecting the test receiver positive lead.
Always remove the test receiver ground lead last.
9. Use with this receiver only the test fixtures specified in this service manual.
CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver.
Electrostatic ally Sensitive (ES) Devices
7
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such

Warning and Cautions
components are usually called Electrostatic ally Sensitive (ES) Devices. Examples of typical
ES devices are integrated circuits and some field effect transistors and semiconductor “chip”
components. The following techniques should be used to help reduce the incidence of
component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor- equipped
assembly, drain off any electrostatic charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available discharging wrist strap device,
which should be removed to prevent potential shock prior to applying power to the unit
under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a
conductive surface such as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static type folder removal device. Some solder removal devices not
classified as “anti-static” can generate electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to
damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately
before you are ready to install it. (Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil or comparable conductive
material).
7. Immediately before removing the protective material from the leads of a replacement ES
device, touch the protective material to the chassis or circuit assembly into which the device
will be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other
safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise
even some normally harmless motions such as mutual brushing of your clothes’ fabric or
lifting of your foot from a carpeted floor might generate static electricity sufficient to damage
an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will
maintain tip temperature within the range of 500oF to 600oF.
2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire bristle (0.5 inch, or 1.25cm)
brush with a metal handle. Do not use freon-propelled spay-on cleaners.
5. Use the following unsoldering technique
8

Warning and Cautions
a. Allow the soldering iron tip to reach normal temperature. (500o F to 600o F)
b. Heating the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-type solder removal device
with solder braid.
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
6. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature. (500o F to 600o F)
b. First, hold the soldering iron tip and solder the strand against the component lead until
the solder melts.
c. Quickly move the soldering iron tip to the junction of the component lead and the printed
circuit foil, and hold it there only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
d. Closely inspect the solder area and remove any excess or splashed solder with a small
wire-bristle brush.
Remove /Replacement
Some chassis circuit boards have slotted holes (oblong) through which the IC leads are
inserted and then bent flat against the circuit foil. When holes are of slotted type, the following
technique should be used to remove and replace the IC. When working with boards using the
familiar round hole, use the standard technique as outlined.
Removal
Desolder and straighten each IC lead in one operation by gently prying up on the lead with the
soldering iron tip as the solder melts.
Draw away the melted solder with an anti-static suction-type solder removal device (or with
solder braid) before removing the IC.
Replacement
Carefully insert the replacement IC in the circuit board.
Carefully bend each IC lead against the circuit foil pad and solder it.
Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic
coating to the areas).
“Small-Signal” Discrete Transistor
Removal/Replacement
Remove the defective transistor by clipping its leads as close as possible to the component
body.
Bend into a “U” shape the end of each of three leads remaining on the circuit board.
Bend into a “U” shape the replacement transistor leads.
9

Warning and Cautions
Connect the replacement transistor leads to the corresponding leads extending from the circuit
board and crimp the “U” with long nose pliers to insure metal to metal contact then solder each
connection.
Power Output, Transistor Device
Removal/Replacement
Heat and remove all solder from around the transistor leads.
Remove the heat sink mounting screw (if so equipped).
Carefully remove the transistor from the heat sink of the circuit board.
Insert new transistor in the circuit board.
Solder each transistor lead, and clip off excess lead.
Replace heat sink.
Diode Removal/Replacement
Remove defective diode by clipping its leads as close as possible to diode body.
Bend the two remaining leads perpendicularly to the circuit board.
Observing diode polarity, wrap each lead of the new diode round the corresponding lead on the
circuit board.
Securely crimp each connection and solder it.
Inspect (on the circuit board copper side) the solder joints of the two “original” leads. If they are
not shiny, reheat them and if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow stake.
2. Securely crimp the leads of replacement component around notch at stake top.
3. Solder the connections
CAUTION: Maintain original spacing between the replaced component and adjacent
components and the circuit board to prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive
that bonds foil to the circuit board causing the foil to separate from or “lift-off” the board. The
following guidelines and procedures should be followed whenever this condition is
encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the following procedure to install a
jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much
10

Warning and Cautions
copper as absolutely necessary).
2. Carefully scratch away the solder resist and acrylic coating (if used) from the end of the
remaining copper pattern.
3. Bend a small “U” in one end of a small gauge jumper wire and carefully crimp it around the
IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the
previously scraped end of the good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.
At other connections
Use the following technique to repair the defective copper pattern at connections other than IC
Pins. This technique involves the installation of a jumper wire on the component side of the
circuit board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to insure that a hazardous condition will not exist if the
jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern break and locate the nearest
component that is directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one
side of the pattern break to the lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch components
or sharp edges.
11

Net dimension
6. Net dimension
Haier
12

7. Parts and Functions
1.Front panel of the TV set
Parts and Functions
VIDEO
TV/AVMENU - VOL +
R
L
VIDEO
TV/AVMENU - VOL +
R
L
Menu Channel
position up/down
TV/AV
switch Volume
up/ down
Signal receiver
Power indicator
Headphone
socket
Video
R/L
audio
2.Rear panel of the TV set
S-VIDEO
YCbCr
OUT
IN
VIDEO AUDIO
VIDEO AUDIO
A
ntenna input socket
VideoCr input terminal
A
udio left channel input terminal
A
udio right channel input terminal
A
udio left channel output terminal
A
udio right channel outputterminal
Video Cb input terminal
VideoY input terminal
Video input terminal
Videooutput terminal
S-VIDEO input terminal
13

8. Remote Controller Functions
14
12
Game Background Select Butt
Remote Controller Functions
1
2
3
4
5
6
8
7
9
10
17
18
19
20
16
12
21
22
23
24
25
123
456
789
0
TV/AV
-/--
BAR
HTR-040
DISP SYSTEM SCAN
WATCH
S.STDP.STD
LOCK
CH+
CH-
VOL+VOL- MENU
HIT
PRE BACK
CALENDAR
FIRE LIGHT FIRE
EXITMODE RESTART
Buttons and Descriptions
TVandAVExchange Button
To exchanger between TV and
other available video inputs
Mute Button
Press to conceal the sound of programs.
Screen Display Button
System Adjust Button
Direct-digit ChoosingButton
Directlyselectchannelnumbers
Lock Setting button
Used for setting lock for channel-
searching, channel,AV and clock,etc.
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
22
Menu Select/ Adjust Button
Use this button to adjust the menu,
the volume andthe channels, as well
as to control the game.
Chromaic Belt Length Adjust Button
(this machine has not this function)
Program Play-forward Button
Calendar on
BAR Button
(this machine has not this
function)
Fire Button (can call the calendar)
Background Lamp Control Button
Restart Game Button
Picture Mode Select Button
There are DYNAMIC, STANDARD,
MILD,MEMORY, PICTURE MUTEand
COLOR MUTEsixmodesofpicture.
23
24
25
DC StandbyButton
Sleep Timer Button
The stopwatch can work 1 hour without
interruption and when you use this
function,do not operateother
function button as well.

9.Program Diagram
Insert the power plug into the power line socket and insert the antenna plug into the antenna
socket on the rear panel. Press down the power switch of the TV set. The red indicator light
goes on. If no picture appears, press the button on the remote controller. Follow the steps
below.
A．Program preset
1. Auto searching and storing program
Press MENU button on the remote controller then use the “ “ key to call up the “tune
program” menu on the screen. Then Press the menu” “ item to select it.Use the “ ”
key to select the bar “auto search program” then press the “ ” to make sure. If you
want to stop ,press the key “ ”.
2. Manual search and fine tune
Press MENU button then use the “ “ key to call up the “tune program” menu on the
screen. Then Press the menu” “ item to select it.Use the “ ” key to select the bar
“Manual search program” then press the “ ” to make sure.
3.Deleting channel number
Press Program up/down buttons to select a channel to skip. Press MENU to call Menu.
then use the “ “ key to call up the “TUNING” menu on the screen. Then Press the
menu” “ item to select it.Then select “SKIP” and select SKIP to ON. Now the program
number is deleted. Repeat the above steps and select SKIP to OFF, the deleted program
number can be resumed.
B．Volume tuning
Press VOLUME buttons - to increase and + to decrease the volume.
Program Diagram
C Personal preference settings
Picture modes
Press SELC PICTURE repeatedly to change the Picture Mode.
15

Maintenance Service and Trouble shooting
10. Maintenance Service and Trouble shooting
A. Principle integrated circuits
A1. 21F3A-T color TV set composed of the following sections
(1) Small signal processing: super monolithic integrated circuits N204(TMPA8823CSN).
and memory N901 (AT24C08).
(2) Sound power amplifying: integrated circuits N701 ( TDA2611).
(3) Horizontal and Vertical scan output circuits: Vertical output integrated circuits N402
(LA7840), Horizontal output transistor V411 (2SD1879), Horizontal flying back
transformer T402 (JF0501-19910).
(4) Switch power supply: switch transformer T501 (BCK-08A6F), power transistor
V503 (2SC4236).
(5) AV switch integrated circuits N203 (TC4053).
A2. Main integrated circuits:
(1) TMPA8823CSN Microprocessor
Picture IF/sound IF/video processing/H and V
Scan/color decoding
(2) LA7840 Vertical output integrated circuits
(3) TDA2611 Sound power amplifying integrated circuits
16

A3. Error Detection Process
1.
Normal
Check to see if
Fuse is normal
No light and sound
A
bnormal
CheckVD503~VD506,
C507,V513,etc.
Checktoseeifthe
collectorvoltageofV552
is27V
The failure ofhorizontal unit
orN204
Check to see
if , 9v,
5v is normal
Check the control
voltage of V572 or
CPU power pin
Check
N902,V905,ect
Normal
Normal
A
bnormal
Checktosee110V、180V
etc. voltageisnormal
Testtoseeallterminal
Resistanceofload
Checkswitch
power unit Check to see if
rectifying tube
is normal
Check the
Loader Change
rectifying diode
A
bnormal
Normal
Abnormal
Normal
A
bnormal
Normal
A
bnormal
The failure of horizontal
unit orN204
Maintenance Service and Trouble shooting
17

Normal
A
bnormal
Video amplifying
board is abnormal
T402,VD415 or
C415,C416 are
broken
V411 is not well
welded or open
Higher Lower
Inspect the circuit
from pin50 、
51\52、51 of N204
to video amplifying
Check the voltage
of V411 collector is
normal
InspectT401、R437
etc.
A
bnormal
NO
YES
A
bnormal
Normal Normal
A
bnormal
A
bnormal
Normal
Check the voltage Heater Resistor
open Check to see if be
voltage of V411 is
existed?
Check the circuit
from pin13 of N204
to V444
No raster
Whether G2 voltage is normal
Change wrong component
or check
Check to see if +9V
voltage is normal at
PIN 17 of N204
Check Z901、N204 and Check +9V power supply
A
bnormal
Normal
Test filament voltage Test the base voltage of V444
Maintenance Service and Trouble shootingMaintenance Service and Trouble shooting
2
of all pins of XZ603
Normal
peripheral circuit of N204
18

Maintenance Service and Trouble shooting
Check to see if the deflection
yorks are connected, C433 is
open or weldless. Inspect
peripheral component of N402
Inspect +27V
p
ower su
pp
l
y
Inspect N204
and peripheral
components of
N2
0
4
Change N204 and
repair circuit
Yes No Yes No
Check to see if the voltage
of pin 15 and pin16 of
N204 is normal
Check to see if voltage of pin6 at
N402 is normal
Yes No
Make R328 open. Multimeter is at range RΧ1K. Red
probe connects to ground. Touch No.5 of N402 with
black probe. Bright line flashes for a moment
Horizontal bright line
3
Normal and N402 itself
4.
Enter D-MODE or enter
S-MODE with c
remote controller
19
Snowy noise exist
No sound and picture
Not exist Exist
Check to see if RAGC is
at 00 mode Check to see if voltage
output available at tuner
ustomer
. Make
RAGC tuned to 25 or so.
Noise on picture just
Inspect V101、
Z101、N204and
PIF rt
Yes No
Antenna
or tuner is
abnormal
Inspect the
circuit from
CPU to tuner
Yes No
pa
disappears.