15 List of Parts------------------------------------------------------------------------------34
16 Damageable Parts List---------------------------------------------------------------49
17 Information of Resistors and Capacitors--------------------------------------50
1
Page 3
Product Code illumination and Series Introduction
2.
Product Code illumination and Series Introduction
T - 21
H
80
Color television appearance
CRT size(unit:inch)
Company of Signal processor IC TD: Toshiba
Haier
2
Page 4
Features
3.
Features
PICTURE
1
2
3
4
5
6
7
AUDIO
8
9
10
11
12
13
14
15
16
17
JACK
18
19
20
21
22
23
ITEM
Main IC 1238
CRT
Color system
Audio system
NO.of channels
OSD language
Multi-picture modes
AV stereo
Super woofer
Surrounding sound
Treble/bass boost
Left/right balancer
NICAM
Multi-audio modes
Tone adjuster
MTS/SAP
Auto-volume leveling
AV input
AV output
DVD terminal
S-video jack
Headphone socket
SCART socket
NO.
FUNCTION
HT-2180
Flat square 25
ENGLISH 29
MODEL
NO.
24
PAL 26
B/G 27
218 28
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
ITEM
SOFTWARE
PARAMETER
FUNCTION
Digital curtain
Slow fading on & off
Semitransparent menu
Non-flashing channel changing
ZOOM
16:9 mode
Games
Calendar
Child-lock
Multi-functional lock
No-picture listening
Background light
Auto-timer on
CCD
V-CHIP
NO. of built-in speakers
Audio output power(W)
Total power input
Voltage range
Power frequency
Time of sleep timer(MINS)
Net weight(KG)
Gross weight(KG)
Net dimension(MM)
Packaged dimension(MM)
Quantity for 20' container
Quantity for 40' container
Quantiry for 40' high container
W
V
Hz
MODEL
HT-2180
2
3
70
~90-250
50/60
120
23.5
25
610×460×490
685×50×530
3
Page 5
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
Page 6
5. Warning and Cautions
g
Warning and Cautions
1. When you clean the TV set, please pull
out the power plu
clean the cabinet and the screen with
benzene, petrol and other chemicals.
2.
In order to prolong the using life of the
TV set, please place it on a ventilated
place.
from AC outlet. Don't
Warning and Cautions
4. To prevent the TV set from firing and
electric shock, don't
make the TV set rain
or moisture.
5. Don't open the back cover, otherwise it is
possible to damage the components in the
TV set and harm you.
3.
Don't place the
TV set in the
sunshine or near
heat source.
6. When the TV set isn't going to be used
for long time or it is in thunder and
lightening, please pull out the pl ug from AC
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.
NOTE: If unforeseen circumstances create conflict between the following servicing precautions
5
Page 7
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 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
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
6
Page 8
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
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.
Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.
Keep the soldering iron tip clean and well tinned.
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.
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.
7
Page 9
Warning and Cautions
Warning and Cautions
c. 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.
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).
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
8
Page 10
Warning and Cautions
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 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
9
Page 11
Warning and Cautions
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.
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.
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.
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
Page 12
b
Net dimension
6.
Net dimension
Front view
Haier
ack-view
Side view
HT-2180
11
Page 13
g
g
Parts and Functions
7.
Parts and Functions
V
/
A
V
T
M
E
N
U
O
P
R
Powe r switch button
Infrared sensor window
Power indicator
Pro
ramme u p/down button
Volume up/down button
TV/AV alternatin
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.
AProgram 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 “tune program” menu on the screen. Then Press the menu”
“ item to select it.Use the “ ” key to select the bar “Cannal number” then press the “ ” to
make sure. Enter the number that you do not want to see .Then 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.
BVolume tuning
Press VOLUME buttons - to increase and + to decrease the volume.
C Personal preference settings
Picture modes
Press SELC PICTURE repeatedly to change among MEMORY 1, MEMORY2,MEMORY3,to chang
the Picture Mode.
15
Page 17
Maintenance Service and Trouble shooting
10.Maintenance Service and Trouble shooting
1.Factory adjustment information
Operation method: after the appliance is switched on, make the volume value to zero. Then
press “ V- ” key on the TV set and press the DISP button on remote controller at the same time
to enter the S state. Press DISP button one times and “S” will disappear, Repeat the first step,
you will enter the D mode. Now one “D” is displayed on the TV screen.
Press PRO- and PRO+ buttons to select items for adjustment.
Press VOL- and VOL+ buttons to adjust selected items.
Press the POWER button to switch off the appliance and go back to the normal state.
Maintenance menu (Table 8)
Item Specifications Default Value
RCUT RED CUT OFF BALANCE 20 *
GCUT GREEN CUT OFF BALANCE 20 *
BCUT BLUE CUT OFF BALANCE 20 *
GDRV GREEN DRIVE BALANCE 40 *
BDRV BLUE DRIVE BALANCE 40 *
CNTX CONTRAST MAX VALUE 7F
BRTC BRIGHTNESS 48
COLC NTSC COLOUR CENTER VALUE 2E
TNTC TINT CENTER VALUE 48
COLP PAL COLOUR CENTER VALUE 20
COLS SECAM COLOUR CENTER VALUE 40
SCOL SUB SCOL TRAST 07
SCNT SUB CONTRAST 0E
CNTC SUB CONTRAST CENTER VALUE 50
CNTN SUB CONTRAST MIN VALUE 08
BRTX SUB BRIGHTNESS MAX VALUE 35
BRTN SUB BRIGHTNESS MIN VALUE 35
COLX SUB COLOUR MAX VALUE 3F
COLN SUB COLOUR MIN VALUE 00
SELF ROM DATA CHECK SELF 00
SELF VOC VCO CHECK SELF 80
SELF AGC AGC CHECK SELF 80
SELF BRTC BRIGHTNESS CENTER VALUE CHECK SELF 75
SELF CNTC CONTRAST CENTER VALUE CHECK SELF 23
SELF TNTC TINT CENTER VALUE CHECK SELF 00
SELF COL COLOUR CENTER VALUE CHECK SELF 20
OSD OSD POSITION 07
OPT OPTION 07
You can change the DATA with “*” mark when necessary.
Specifications
50Hz VERTICAL POSITION
17
Default Value
02
04 *
70 *
* *
* *
Variable
Mark
*
*
*
*
Page 19
N
N
n
r
N
Maintenance Service and Trouble shooting
ormal
Check D902 V902
and V901
1.
o raster and no sound
Check the fuse
Normal
Check VD503∼VD506 V513C507
Normal
Check if the connector electrode
Normal
Check 12V
9V5V
Abnormal
Check V552 or CPU
POWER control
circuit
Abnormal
There is breakdown i
horizontal circuit and N201
Abnormal
Check if all loading resistors are normal
ormal
Check switch
circuit
Normal
Replace the
rectifier diodes
powe
Abnormal
Abnormal
Check if rectifier diodes
breakdown
Abnormal
Loading has
breakdown
18
Page 20
Maintenance Service and Trouble shooting
N
n
b
d
t
r
r
f
t
d
r
t
r
Norma
N
r
b
2.
Check heater voltage
Normal
Check all
voltages of pins
at X602
ormal
No raster
Check if G2 voltage on CRT board is normal
l
Check the base electrode voltage of V444
Abnormal
ormal
The heate
resister is
broken.
Abnormal
Check the voltage betwec
ace electrode an
connector electrode of v411
Abnorma
Abnormal
Check the circui
between pin 32 at N210
and H drive grade
There is
breakdown in
CRT broad
Check the connecto
electrode voltage o
V411
V411 is rosin joint o
roken
Normal
Check circuit
between pin18
pin20 in N201
Lower
Ye s
Check if FBT T402
V411or C415C416 are
leakage of electricity
There is breakdown in horizontal
drive grade, Check V444T401
R437
Check if pin 28
voltage 9V a
N201 is normal
Rechange ba
components o
remedy conten
circuit.
Abnormal
Abnormal
Check the horizontal oscillation external
circuit of Z280N201 and N201
Check 9Vpowe
19
Page 21
k
r
f
t
f
d
r
Maintenance Service and Trouble shootin
g
3.
Horizontal bright line
Break R908 , let multimeter preset on R1K and red meter rod grounding, let blac
meter rod tap pin 4 at N402.see if the bright line can wide at instant.
YES
Check if R907R448 are
There is breakdown in the vertical outpu
rosin joint and the resisto
value of R448 changes
larger.
YES
NO
grate.
YES
Check if the connector o
the deflection yoke is
Normal
Check the
external circuit o
N201 and N201.
connected well,and C433is
rosin joint or cutoff, and the
external circuit of N402 an
N402.
NO
Check 26V powe
circuit.
20
Page 22
d
f
n
Maintenance Service and Trouble shooting
4.
Picture OK, no sound
Break C700,let red meter rod ground and let black meter rod tap pin6 at N701,
the speakers has snapping.
Ye s
If power amplifier is normal ,
check N201 sound IF circuit an
N201.
Ye s
There is breakdown in sound mute
circuit, check V701, V903
Ye s
Check sound power amplifier N701
No
Break the connector electrode o
V701, let the black meter rod tap pi
6 at N701 , see if the speakers have
snapping.
No
Check if there is 19V voltage
No
Check 19V power circuit.
and
circuit , speaker.
21
Page 23
d
t
n
,
r
N
N
d
p
N
Maintenance Service and Trouble shooting
5.
NO YES
Check RAGC item of ICbus is
“
”
YES
Use the remote controller an
enter S-MODE and adjus
RAGC to near 2D
RASTER OK, NO PICTURE, NO SOUND
Whether there are noise dots?
Whether there are voltages i
every pin of tuner
O
Check picture IF channel
and V231
V212, N201
YES
Aerial system or tune
breaks down.
NO
Check the circuit between
CPU and tuner.
6.
YES
Replace V622 or joint.
O red
Check if V622 is rosin joint or break?
YES
Check V621, R621
Check the circuit between pin 18 at N201 an
in 3 at XS261
NO
Check the voltage of pin 1 at XS602
O
22
Page 24
n
Maintenance Service and Trouble shooting
7.
Check L902,C926,C925
Normal
Replace the
compartments
Abnormal
No
There is black words?
Check the circuit between pin 22pin 24
Check the circuit betwee
V922,R915,C450 and pin 5 at FBT.
23
Page 25
11
Ci
Di
.Circuit Diagram
rcuit
agram
24
Page 26
n
Circuit Block Diagram
Circuit Block Diagram
CPU
Infrared sensor
SAW
Remote co
IF.video colorRGB
H.V oscillationsca
signal prossing
EPROM
AV i nput/output
Sound power amf.
CRT
H output
V output
SIF band
pass filter
unit
volume control
AU.OUT
SIF trap
unit
EXT.C.INEXT.A.IN
.
scan unit
V.OUT
IF INIF IN
H.OUT
6dB
EXT.Y.IN
6dB
Color subcarry
trap circuit
Video unit
matrix unit
band-pass/ high
-pass filter
Color unit
23
25
Page 27
26
Page 28
l
Circuit Explanation
Circuit Explanation
12.
IC function pins
1) Integrated circuits used in this model
1) TBA1238AN: picture intermediate amplification, sound intermediate amplification, video signal
processing, chrominance signal processing, RGB output circuit, horizontal and field oscillating scan
circuit.
2) TMP87CK38N: super central micro-processing unit.
3) LA7830 (LA7833): field scan circuit
4) LA4275: sound power amplifier circuit
5) LA7910: wave band change-over switch
2) IC functions and parameters
N402 LA7830 (LA7833)
No. Function Reference
1 Grounding 0 0 0
2 Output 14 0.45 1.6
3 Pump power supply output 24(26) 0.5
4 Field scanning sawtooth signal input 0.9 0.9 1
5 Field scanning sawtooth signal
forming terminal
6 Field power supply 24(26) 0.5 4.5
7 Field power supply input 1.9 0.72 30
1 Unweighted 5.0 5.0 800 2000
2 Audio signal output 3.5 3.5 750 2000
3 PIF circuit power supply 9.0 9.0 460 600
4 AFT output and auto-adjusting 2.1 2.1 750 600
5 PIF circuit grounding 0 0 0 0
6 IF signal input pin 2.0 2.0 680 2000
7 IF signal input pin 2.0 2.0 680 2000
8 RF AGC output 6.6 4.0 680 2000
9 IF AGC filtering 5.2 4.1 760 2000
10
Color demodulation APC filtering
11 4.43MHz crystal oscillator 3.5 3.5 820 3000
12 Y/C circuit grounding 0 0 0 0
13 Analog RGB and AKB mode
alternating
14 Analog R signal input 2.7 2.7 800 3000
15 Analog G signal input 2.7 2.7 800 3000
16 Analog B signal input 2.7 2.7 800 3000
17 RGB(image and message
circuit) power supply
18 R signal output 3.0 3.0 760 1500
19 G signal output 3.0 3.0 760 1500
20 B signal output 3.0 3.0 720 1400
21 ABCL control pin 5.6 5.6 820 2000
22 Field sawtooth wave forming 4.1 4.1 750 2000
23 Field feedback signal 5.0 5.0 820 2000
24 Field driving signal output 0.9 0.9 720 900
25 Field AGC 1.8 1.8 800 2000
26 Bus clock signal 5.0 5.0 720 15000
27 Bus data signal 5.0 5.0 720 15000
28 Deflection circuit power supply 9.0 9.0 450 600
29
PAL/NTSC identification signal
output
SECAM identification signal input
30 Line feedback pulse input 0.6 0.6 780 2000
31 Composite synchronizing pulse
signal output
32 Line driving signal 2.7 2.7 640 680
33
Deflection circuit grounding pin
34 Sandcastle pulse input 1.5 1.5 820 2000
35 Video switching signal output 3.1 3.1 750 1200
36 Digital circuit power supply 5.0 5.0 470 800
Reference Voltage(V)
Without
With signal
Reference Resistance(KΩ )
Forward(Ω) Backward(Ω)
signal
2.4 2.4 750 3000
0 0 720 650
9.0 9.0 450 600
1.5 1.5 800 2000
4.5 4.5 780 2000
0 0 0 0
28
Page 30
l
Pin Function
Reference Voltage(V)
Without
With signal
Forward(Ω) Backward(Ω)
Circuit Explanation
Reference Resistance(KΩ )
signal
37 SECAM B-Y signal input 2.4 2.4 800 2000
38 SECAM R-Y signal input 2.4 2.4 800 2000
39 Y signal input 3.1 3.1 800 3600
40 Line AFC filtering 6.6 6.6 800 2000
41 External video/Y signal input 1.6 1.6 800 2000
42 Digital circuit grounding 0 0 0 0
43
Reference Voltage(V) Reference Resistance Pin Function
Without
signal
With
signal
Forward(Ω) Backward(Ω)
1 Power supply grounding 0 0 0 0
2 Tuning voltage output * * 700 8000
3 Vacant pin 5.0 5.0 700 8000
4 Mute 5.0 0 700 8000
5 External mute 5.0 0 700 8000
6 Vacant pin 0 0 700 8000
7 Standby power supply 2.0 2.0 700 8000
8 Vacant pin 1~4.2 1~4.2 700 8000
9 Band 1 0~4.8 0~4.8 700 3500
10 Band 2 0~1.7 0~1.7 700 3000
11 Clock bus control 5.0 5.0 700 15000
12 Digit bus control 5.0 5.0 600 15000
13 AFC input 2.3 2.3 700 3000
14 Karaoke switch 0 0 600 10000
15 Keyboard matrix input 4.0 4.0 700 10000
29
Page 31
p
l
Circuit Ex
lanation
Reference Voltage(V) Reference Resistance Pin Function
Without
signal
With
signal
Forward(Ω) Backward(Ω)
16 Keyboard matrix input 4.0 4.0 680 10000
17 Vacant pin 0 0 700 10000
18 Vacant pin 0 0 700 10000
19 Vacant pin 0 0 620 10000
20 Vacant pin 0 0 620 10000
21 Grounding 0 0 0 0
22 Red primary color character
0 0 620 2200
output
30
Page 32
l
Circuit Explanation
Reference Voltage(V) Reference Resistance Pin Function
23 Green primary color
Without
signal
0 0 620 2200
With
signal
Forward(Ω) Backward(Ω)
character output
24 Blue primary color
0 0 620 2200
character output
25 Character blanking 0 0 620 2200
26 Line flyback 4.0 4.0 680 10000
27 Field flyback 4.8 4.8 680 10000
28 Character oscillating 5.0 5.0 600 10000
29 Character oscillating 5.0 5.0 0 10000
30 Grounding 0 0 0 0
31 CPU clock 2.1 2.1 700 10000
32 CPU clock 2.1 2.1 700 10000
33 CPU reset 5.0 5.0 650 40000
34 Vacant pin 5.0 5.0 700 10000
35 Infrared receiving input 5.0 5.0 700 10000
36 Line synchronizing signal
4.7 4.7 700 10000
input
37 Clock bus control 2.9 2.9 700 10000
38 Data bus control 3.2 3.2 700 10000
39 Vacant pin 0 0 700 10000
40 Vacant pin 4.6 4.6 700 10000
41 Vacant pin 0 0 700 10000
42 Power supply 5.0 5.0 420 2700
N101 LA7910
Pin Function
Reference
Voltage(V)
Reference Resistance
Without signal Forward(KΩ) Backward(KΩ)
1 Output (BU) 1.7 120 7.2
2 Output (BH) 12.6 17.5 7.5
3 Control input 4.8 6.5 8.5
4 Control input 0 6.5 9.0
5 Grounding terminal 0 0 0
6 Power input terminal 1 14.0 6.0 50
7 Output (BL) 0 1.5 1.5
8 Vacant pin 0 8.5
9 Power input terminal 2 12 0.5 0.5
31
Page 33
j
l
13.
Adjustment
The chassis of this TV set uses Toshiba IC with the latest digital bus processing technology.
The adjustment points are fewer and the adjustment is simpler. The adjustment method is as
follows:
1) +B: 109±0.3V adjustment.
A) Switch on the power and connect PAL circular signals to the tuner.
B) Adjust variable resistor RP501 until the voltage of the main power is 109±0.3V.
2) Screen voltage adjustment.
A) Switch on the power and receive PAL system circular signal. Warm up the TV set for 15
min.
B) Enter the adjustment D state. Press the “-/--” button, then a bright horizontal line appears.
Adjust screen potentiometer to let the horizontal line just appears.
Ad
ustment
3) Focus adjustment.
A) Receive electronic circular signal.
B) Set picture mode on standard mode.
C) Adjust focus potentiometer until the optimum picture is achieved.
4) White balance adjustment.
A) Set the picture mode on standard mode.
B) Enter the Factory state and adjust WPR, WPG, WPB, RED and GRN.
C) Coordinate of reference white color: (X=0.281, Y=0.311).
5) Adjustment of horizontal and vertical position and size.
A) Switch on the power and connect the signals to the tuner to receive PAL/NTSC system
circular signal.
B) Enter the Factory state. Adjust 5HSH to change the horizontal position and 5VAM to
change the vertical position. Adjust 5VSH to change the vertical size until the vertical size
is 90-92%. Horizontal size is related to the capacitor C906. Hold the horizontal size is
90-92%.
6) Adjustment of character positions
Adjust OSD for the horizontal positions of the screen menu.
32
Page 34
Exploded View
14.
Exploded View
HT-2180 EXPLODED VIEW
HT-2180 PARTS LIST
Serial Number Name Part Code Specification Quantity