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HTX20S32
COLOR TELEVISION
Service Manual
MODEL: HTX20S32
Features
MTS Stereo
Front Audio/Video input
V-CHIP, CCD
NO:M-AM-US-20R21-76814 Edition: 2002.12.30
CONTENTS
CONTENTS
1 Contents--------------------------------------------------------------------1
2 Product Code illumination and Series Introduction--------------------2
3 Features--------------------------------------------------------------------------------3
4 Safety Precautions------------------------------------------------------------------4
5 Warning and Cautions-------------------------------------------------------------5
6 Net dimension----------------------------------------------------------------------11
7 Parts and Functions--------------------------------------------------------------12
8 Remote Controller Functions--------------------------------------------------13
9 Program Diagram------------------------------------------------------------------14
10 Maintenance Service and Trouble shooting------------------------------15
11 Circuit Diagram---------------------------------------------------------------------18
12 Circuit Explanation----------------------------------------------------------------22
13 Adjustment---------------------------------------------------------------------------24
14 Exploded View----------------------------------------------------------------------27
15 List of Parts--------------------------------------------------------------------------28
16 Damageable Parts List-----------------------------------------------------------44
17 Information of Resistors and Capacitors----------------------------------44
1
Product Code illumination and Series Introduction
2.Product Code illumination and Series Introduction
H T X 20 S32
Color television appearance
CRT size (unit: inch)
FLAT CRT
Series Name
Haier
2
Features
3.Features
MODEL MODEL
NO. ITEM FUNCTION HS-2190 NO. ITEM FUNCTION TV-9708
1 PICTURE Main IC 76814 24 SOFTWARE Digital curtain h
2 CRT Flat square 25 Slow fading on & off h
3 Color system NTSC 26 Semitransparent menu h
4 Audio system M 27 Non-flashing channel changing
5 Number of channels 181 28 ZOOM h
6 OSD language E ^F ^S ^ 29 16:9 mode h
7 Multi-picture modes 30 Games
8 AUDIO AV stereo 31 Calendar
9 Super woofer h 32 Child-lock
10 Surrounding sound h 33 Multi-functional lock h
11 Treble/bass boost h 34 No-picture listening h
12 Left/right balancer 35 Background light h
13 NICAM h 36 Auto-timer on
14 Multi-audio modes h 37 CCD
15 Tone adjuster h 38 V-CHIP
16 MTS/SAP 39 PARAMETER Number of built-in speakers 2
17 Auto-volume leveling h 40 Audio output power (W) 3+3
18 JACK AV input Rear 1fornt 1 41 Total power input ~W ¯ 70
19 AV output Rear 1 42 Voltage range ~V ¯ 110~220
20 DVD terminal h 43 Power frequency ~Hz ¯ 60
21 S-video jack Rear 1 44 Time of sleep timer (MINS) 120
22 Headphone socket h 45 Net weight (KG) 23.5
23 SCART socket h 46 Gross weight (KG) 25
47 Net dimension (MM) 475×450×435
48 Packaged dimension (MM) 550X505X505
49 Quantity for 20' container h
50 Quantity for 40' container h
51 Quantity for 40' high container
3
Safety Precautions
4. Safety Precautions
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.
4
Warning and Cautions
5.Warning and Cautions
1. When you clean the TV set, please pull 4. To prevent the TV set from firing and
out the power plug from AC outlet. Don't electric shock, don't
clean the cabinet and the screen with make the TV set rain
benzene, petrol and other chemicals. or moisture.
2. In order to prolong the using life of the 5. Don't open the back cover, otherwise it is
TV set, please place it on a ventilated possible to damage the components in the
place. TV set and harm you.
3. Don't place the 6. When the TV set isn't going to be used
TV set i n t h e for long time or it is in thunder and
sunshine or near lightening, please pull out the plug from AC
heat source. outlet and the antenna plug from the cover
of the TV set.
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.
5
Warning and Cautions
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.
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 sprays 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
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
6
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 500 oF to 600 oF.
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
a. Allow the soldering iron tip to reach normal temperature. (500 o 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.
7
Warning and Cautions
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
1) Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature. (500 o 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.
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.
8
Warning and Cautions
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 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.
9
Warning and Cautions
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.
10
Net dimension
6.Net dimension
11
Parts and Functions
7.Parts and Functions
HTF20R21
12
Remote Controller Functions
8.Remote Controller Functions
1
2
TV/AV DISP
1 2 3 3
4 5 6
7 8 9
4
9
SOUND
0 RATING
MENU RECALL
8
CH+
VOL+ 5
7 CH-
P.STD
Haier
R
6 HYF-25E
1. Power Button
8. Menu Select Button
2. Time & Channel Display Button
9. Audio Select Button
3. Rating Button
TV Program (V-Chip Setup) 9. Audio Select Button
10.Direct Access Channel Select
4. Last Channel Recall Button
11. TV/AV Input Button
5. Volume(+/-) Select Button
6. Personal Preference Select 12. Mute Button
13. Sleep Timer
7. Channel(+/-) Select Button
17
13
Program Diagram
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.
Program preset
A° 1). Auto searching and storing program
Press MENU button on the remote controller to call up the "PREST" menu on the screen. Use the
" " key to select the bar "auto search" then press the " " to make sure. If you want to stop,
press the key " ".
2). Deleting channel number
Press channel up/down buttons to select a channel to skip. Press MENU to call up the "PREST"
menu on the screen. Then Press the" "item to select the bar "Add/Delete"
then use the " " key to select Add or Delete.
B°
°Volume tuning
Press VOLUME buttons VOL- to decrease and VOL+ to increase the volume.
C Personal preference settings
Picture modes
Press P.STD repeatedly to change among Personal, Standard, Vivid, Soft to change the Picture Mode.
14
. Maintenance service and trouble shooting
10.Maintenance service and trouble shooting
1). Adjustment item Explanation:
OSD Explanation Range Remark
0 H.PHASE H.PHASE 0~31
1 NT.H.PHASE H.PHASE 0~31 No used
2 H.BLK.LEFT 0~7
3 H.BLK.RIGHT 0~7
4 V.SIZE Vertical Size 0~127
5 V.LINE Vertical Linearity 0~31
6 V.POSI Vertical DC 0~63
7 V.SC Vertical S-Correction 0~31
8 NT.V.SIZE Vertical Size -32~+31 No used
9 NT.V.LINE Vertical Linearity -16~+15 No used
10 NT.V.POSI Vertical DC -32~+31 No used
11 NT.V.SC Vertical S-Correction -16~+15 No used
12 RF.AGC RF AGC Delay 0~63
13 VOL.OUT Volume Control 0~127
14 OSD H.POSI 0~127
15 OSD V.POSI 0~31
16 INPUT LEVEL 0~15
17 SPECTRAL 0~63 (0~31)PHILIP IC
18 WIDEBAND 0~63 (0~31)PHILIP IC
19 STEREO VCO 0~63 No used
20 FILTER SET 0~63 No used
21 SAP VCO 0~63 No used
" & R X Q W G R"Z Q $ P R G H
/ /$
VHOHFW
GHILQH
" % U LW KD E O W K U H V K R O G
J "
" ( P J D E O"G H I
15
.Maintenance service and trouble shooting
Brt.Abl.Def (0/1)
Mid.Stp.Def (0/1)
-- < %< * % / R-Y/B-Y Gain Balance (0~15) No use (LA76814)
R-Y/B-Y Angle (0~15)
C_Kill OFF (0/1)
Sound Trap (0~7)
Volume Filter Defeat
Video IF setting (0 45.75M 1 58.75M) For LA76814
Video Level (0~7)
FM Level (0~31)
0 turn TV on twice 1 memory 2 OE 3
Turn TV on first
0 without AV 1 one AV input 2 two AV input 3 Three AV input
No used No used
No used No used
No used No used
' W F X W R I I % H I R 3 2 : ( 5 2 ) )F X W R I I
UH
YLGHR LQSXW YLGHR LQSXW
NOTHING NOTHING
16
Maintenance Service and Trouble shooting
No lig
Check to see if
Fuse3 is normal
Abnormal
Normal
Check VD501, C507, Check to see 110V ^180V
V513, etc. etc. voltage is normal
Normal
Abnormal
Check to see if the Test to see all terminal
collector voltage of V552 Resistance of load
is 0V Is normal
Normal Abnormal Normal Abnormal
Check to see Check the control Check Check to see if
if , 12v, voltage of V552 or power unit rectifying tube
5v is normal CPU power is normal
Normal Abnormal Normal Abnormal
Check N101 The failure of Change Check the
ect horizontal unit or rectifying tube Loader
N551 N552
17
Circuit Diagram
11. Circuit Diagram
18
Circuit Diagram
X 801- 2
S XS803 X 801- 1
S
AV2 XS802
AVout AV1
V2in
L2in
R2in
L1in
R1in
Lout
Rout
V1in
Vout
B6
Y
C
R825 R624 12V
B3 82 1/ 2W39
C806 CRT BOARD
12V 16V10
+
R1010 W801
R1009 R826 C03 C04
4. 7K R814 X
47K 4. 7K C812 C13 50V 7
4. 220nF
R808 4. 7K VHS
0. 01 47nF R03 C
R835 82 14 C15 C16 C01 R01
+
V804 C19
68K R02 RJ160 50V10 100nF 50V 7
4. R21 R20 50V10 16V100 2. 2K C05
R838 2SC1815 + 100
J8.
R 2K + 100
+ 50V10
82 + +
R823 B6 C02
8. 2K C824 470nF
C811 12V
R836 C810 16V100 N641 R907
+
C825 R837 16V10 +
R902
10
11
12
13
14
15
16
22K C809 16V10 2SJ10K
1
2
3
4
5
6
7
8
9
16V47 1K C807 C808
+
B6 T A9850
D 100 V902
+
16V10
+
16V10 16V10 + +