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HTN19R12/HTN19R12S
COLOUR TELEVISION
Service Manual
MODEL :
HTN19R12/HTN19R12S
(America)
Features
48cm super flat picture tube
Auto search 181 program presetting and memory
CCD & V-CHIP
Haier Group
NO:M-MR-AE-HTN19R12-76814 Edition:2004/4/17
CONTENT
CONTENT
1. Contents...............................................................................1
2. Product code illumination and series introduction.....................2
3 Features.............................................................................3
4 Safety Precaution................................................................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..................................................................21
12. Circuit Explanation..............................................................24
13. Adjustment.........................................................................31
14. Exploded View....................................................................33
15. List of Parts........................................................................34
16. Damageable Parts List.........................................................49
17. Information of Resistors and Capacitors...............................50
Product code illumination and series introduction
2. Product code illumination and series introduction
HTN 19 R12
Color television appearance
Appearance serial
CRT catercorner 20inch (51cm)
BRAND
FEATURES
3. FEATURES
FUNCTION FUNCTION
1 Main IC 76814 39 NO. of built-in speakers 1
2 CRT flat picture 40 Audio output power(W) 2W
3 Color system NTSC3.58 41 Total power inputW 70W
PIC
4 Audio system M 42 Voltage rangeV 120V
5 NO.of channels 181 43 Power frequencyHz 60HZ
PARAMETER
6 OSD language ENGLISHFRENCH SPANISH 44 Time of sleep timer(MINS) 120MIN
7 Multi-picture modes 45 Net weight(KG) 21
8 AV stereo 46 Gross weight(KG) 23
9 Super woofer 47 Net dimension(MM)
10 Surrounding sound 48 Packaged dimension(MM)
11 Treble/bass boost 49 Quantity for 20' container
AUDIO
12 Left/right balancer 50 Quantity for 40' container
13 NICAM 51 Quantiry for 40' high container
14 Multi-audio modes 52 APPROVAL Acquired certificate
15 Tone adjuster 53 Suitable market
16 MTS/SAP
17 Auto-volume leveling
18 AV input Y
19 AV output
20 DVD terminal
JIC
21 S-video jack
22 Headphone socket Y
23 SCART socket
24 Digital curtain
25 Slow fading on & off
26 Semitransparent menu
27 Non-flshing channel changing
28 ZOOM
29 16:9 mode
SOFTWARE
30 Games
31 Calendar
32 Child-lock
33 Multi-functional lock Y
34 No-picture listening
35 Background light
36 Auto-timer on
37 CCD Y
38 V-CHIP Y
SAFETY PRECAUTIONS
4. SAFETY PRECAUTIONS
INPORTANT SAFETY NOTICE
These parts are identified by many electrical and mechanical parts in this chassis have
special safety-related characteristics.
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.
Warning and Cautions
5Warning 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
T V 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.
Figure 1
Warning and Cautions
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 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
Warning and Cautions
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.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity.
Such components are usually called Electrostatically 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.)
Warning and Cautions
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.
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.(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.
Warning and Cautions
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.
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
Warning and Cautions
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.
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.
Net Dimension
6Net Dimension
Figure 2
Parts and Funcitions
7Parts and Funcitions
Front and side panel of the TV set
POWER
EARPHO NE VIDEO AUDIO
TV/AV MENU VO LUME CHANNEL
Figure 3
When using S terminal, please pull out video 1 input terminal
Remote Controller Functions
8. Remote Controller Functions
M EN U CH+
2 1
4 VOL- VOL+
3
CH-
1 2 3
4 5 6 5
7 8 9
RECALL DISPLAY
0
6 7
8
TV/AV RATING MUTE
9
P.STD SLEEP
10
11 12
Figure 4
Program Diagram
9. Program Diagram
I. Features
HTN19R12 color TV sets (designed for the US market) incorporate the monolithic integrated circuit
LA76814K developed by SANYO in 1999 and the CPU LC863432B-535A designed for LA76814K
control.
LA76814K intergrates the sound accompany filter and trap filter in the chip, resulting in minimized
application of peripheric components, maximized integtration and reliable performance. The chip
functions for picture intermediate frequency amplification, picture detection, sound intermediate
frequency amplification, sound frequency discrimination, video amplification, choma decoding, line
and field synchronized scanning wave formation and output. The circuits of picture detection, sound
frequency discrimination and chroma decoding incorporate PLL demodulation which is noted for
significant stability and reliability. In addition, this chip integrates the brightness and chroma retarding
lines and additional functions of black level extension, bus geometric figure adjustment, I2C bu control
on the basis of the 7687, resulting in test point free assembly, reduced components of test point and
peripheric components and improved picture quality.
The CPU LC863424 uses SANYO LC863432B-535A series for reprogramming. In the design,
functions of CCD and V-CHIP as well as various function extensions are added for the North American
market. This chip also uses low frequency 32.7KHZ crystal oscillator to reduce interferences to
pictures and medium frequency signals.
II. Technical properties and requirements
1. Main performance index
1. Screen diagonal: 51cm
2. Receiving system: NTSC-M
3. Receiving channel: VHF-channel 2~13
UHF-channel 14~49
CATV-channel 1~125
4. Antenna input: 75F plug
5. Picture limit noise sensibility: VHF51dBV
UHF54dBV
6. Color sensitivity: 40dBV
7. Two signal selectivity: -1.5MHZ45dB
+6MHZ50dB
Program Diagram
8. Sound noise limit sensitivity: VHF39dBV
UHF42dBV
9. Sound output power: 2W
10. X-ray radiation value: <0.1mR/Hr
11. Voltage: AC 100130V
12. Energy consumption: 70W
13. Net dimensions: 472mmX445mmX432mm
14. Net weight: 17.5Kg
2. User's instructions
Note: This TV set has been installed a caption decoder and control to US Federal Communications Commission.
Customized Power On setup
This TV set is designed for customized initiation. (For detailed information, see the User's Manual.) The TV set
has been preset before delivery and can be reset by the user.
Power on
1 When the TV set is connected with the power supply, the power indicator illuminates. When the Power
On/Off button on the TV set or the remote controller is pressed, the TV set is started.
2 When the MENU button on the remote controller is pressed, the menu will appear on the screen. The CH
and VOL buttons are used for setup.
3 Press of CH+ or CH- button will result in moving the icon up or down for function options. The
designated item will turn green.
4 Pressing the VOL+ or VOL- button can change the designated item.
VIDEO setup
1 Press MENU button for VIDEO option.
2 Press CH+ or CH- button to designate desired item. (Move the icon to designated item and the submenu
will appear.)
3 The menu item under the icon will turn bright green. Press VOL+ or VOL- button for options.
Options VOL+ VOL-
Program Diagram
CONTRAST Contrast increase Contrast decrease
BRIGHT Brightness increase Brightness decrease
COLOR Color increase Color decrease
SHARP Sharpness increase Sharpness decrease
TINT Tint increase Tint decrease
4 Press MENU button again to quit the main MENU.
SETUP
1 Press SETUP button, the main menu will appear on the screen.
2 Press CH+ or CH- for LANGUAGE options. The designated LANGUAGE will turn bright green.
3 Press VOL+ or VOL- for LANGUAGE options (such as English, Spanish and French)
4 Receiving: Press VOL- button to move the icon to RECEPTION. The TV set is preset AIR state before
delivery (indicating that unlimited receiving of 0~63 channel signals). If the TV set is connected with the
cable TV system, press VOL+ button for CABLE option.
5 Automatic search: Press CH+ or CH- button for AUTO PROGRAM. When VOL or +VOL- is pressed, the
function of automatic channel search will be activated (if signals are available, the channel will be fixed. If
VOL+ button is pressed again, the search can be resumed.)
6 Add/delete: Press CH+ or CH- button for option of ADD/DELETE. Press VOL+ or VOL- button to add or
delete some channel.
7 Input: Press CH+ or CH- button for option of INPUT. Press VOL+ or VOL- button, or press AV/TV
button on the remote controller for option of AV/TV.
8 Press MENU button again to quit the main menu.
TIME setup
1 Press MENU button and the main menu appear on the screen.
2 Press CH+ or CH- button to move the icon for TIME setup. The designated CLOCK under the icon will
turn bright green.
3 Press VOL+ or VOL- button for options of hour, minute and am/pm on the CLOCK.
4 Press CH+ or CH- to adjust the figure until designed time value is reached. Set ON TIME/OFF TIME
with the same way.
5 Press CH+ or CH- for option of SLEEP. Press VOL+ or VOL- for option of set clock. The clock display
will turn bright green while SLEEP icon turns blue. Press CH+ or CH- for sleep period adjustment.
015 / 030 / 045 / 100 / 115 / 130 / 145 / 200
6 When CHANNEL in TIME setup is designated, this option will be the preset channel when the TV set is
Program Diagram
turned on or off.
7 Press MENU button again to quit the main menu.
SPECAIL
1 Press MENU button Press MENU button Press MENU button and the main menu appear on the screen.
2 Press CH+ or CH- button to move the icon to SPECIAL, and designate C.CAPTION. Then icon of
C.CAPTION turns to bright green. When OFF is displayed, C.CAPTION is inactivated while when ON is
displayed, C.CAPTION is activated.
3 Press CH- to move the icon to CC ON MUTE and the icon will turn bright green. Press VOL+ or VOL-
button for adjustment of this function. When OFF is displayed, the item cannot display its function
regardless of the indication of C.CAPTION. When this item displays C1 while C.CAPTION displays OFF,
the system will activate C.CAPTION function automatically.
4 Press CH- button to move the icon to POWER RESTORE. Press VOL+ or VOL- to adjust power on and
off.
5 When icon designates MENU OFFSET, the digital value of the designated item can be adjusted by
pressing VOL+ or VOL-. Function of this item is to change the location of the menu.
6 Press MENU button again to quit the main menu.
V--CHIP setup
This function is designed for television program limitation. The TV set user is allowed to control the usage of the
TV set in accordance with the regulations of US Federal Communications Commission. This function is also
destined to prevent children from watching the TV programs which are improper for juvenile.
1 Press MENU button, the menu will appear on the screen. Press RATING button, V-CHIP displays the
menu.
2 Press CH+ or CH- button to move the icon to another option, then the designated item will turn bright red.
3 When an item is selected, press MENU button and the submenu of the designated item will appear on the
screen.
4 Press MENU button and return to V-CHIP.
5 Press RATING button to the main menu.
6 Press RATING button again to quit the main menu.
OPTION MENU
1 Press RATING button, and the RATING main menu will appear on the screen.
2 Designate OPTION MENU and then press MENU button, OPTION MENU will appear on the screen.
3 Press CH+ or CH- button for item option, and the color of designated item will change from yellow to
bright green.
4 When HELP is selected, press MENU button and HELP menu will appear on the screen. Press CH+ or
Program Diagram
CH- to search up and down for relative items. If MENU button is pressed again, OPTION MENU will
appear.
5 When NO-INFO RATING is selected, press MENU button for option of UNBLOCK or BLOCK state.
6 When NO RATED is selected, press MENU button for option of UNBLOCK or BLOCK state.
7 When ENTER PASSWARD is selected, press MENU button, then a dialog box will appear at bottom left
corner of the screen and then a 4 digit password can be input. Press RATING button again to return to the
main menu.The password must be input when entering the V-CHIP submenu.
TV RATING
1 Press RATING button.
2 When TV RATING is selected, press MENU button and the submenu will appear on the screen as follows:
3 TV RATING
TV-Y
TV-Y7
TV-G
TV-PG
TV-14
TV-MA
RATING FV V S L D
In the table, the blocks marked "" indicates the restrictive items. If all restrictive items are to be selected,
move the icon to the top left corner of the table and then press MENU button.
1 If all restrictive items are to be released, move the icon to the bottom left corner and press
MENU button twice.
2 If one of the restrictive items is to be selected, press CH+ or CH- button in an alternate way and
press MENU button (for some line) and then VOL+ or VOL- for option of desired line. Finally
press MENU button.
3 Some item can be deleted by following the same process above.
4 Press RATING button again to quit V-CHIP menu.
MPAA RATING
1 Press RATING button, and the RATING main menu will appear on the screen.
2 When MPAA RATING turns bright red, press MENU button and MPAA RATING submenu will appear
on the screen.
3 If all items are to be selected, press CH+ or CH- button to move the icon to the top left corner, and then
press MENU button.
4 If all selective items are to be deleted, press CH+ or CH- button to move the icon to the bottom left corner,
and then press MENU button twice.
Program Diagram
5. Items under or above the designated icon in the submenu can be selected.
6. Press RATING button again to quit V-CHIP menu.
BLOCK OFF
1 Press RATING button, and the RATING main menu will appear on the screen.
2 When BLOCK turns bright red and MENU button is pressed, BLOCK will display BLOCK OFF and
BLOCK ON.
Caution:
BLOCK OFF: Indicating lock on status. Regardless setup of TV RATING and MPAA RATING, even V-CHIP
signals are received during TV programs, this TV set dos not have the V-CHIP function.
BLOCK ON: Indicating lock off status. When TV RATING and MPAA RATING are selected, the TV set will
have the V-CHIP function when V-CHIP signals are received in the TV program.
Precausions:
1. Keep the TV set away from heat resources, such as stoves and radiators;
2. Place the TV set in a well ventilated area;
3. Place the TV set in an area free from dusts and corrosive gas;
4. Prevent the TV set from waterdrops, moisture and humidity;
5. Do not place magnetic materials on the TV set;
6. Disconnect the TV set when moving the TV set.
7. When the TV set is turn on during a rainy weather, disconnect the outdoor antenna and use the indoor
antenna attached to the TV set.
8. Disconnect the TV set from power supply source during a power interruption or vacation.
Maintenance Service and
Trouble Shooting
10. Maintenance Service and Trouble Shooting
1 TROUBLESHOOTING PROCESS
No light and sound
Check to see if
Fuse3 is normal
Abnormal
Normal
Check VD504, C507, Check to see 103V
V513, etc. etc. voltage is normal
Normal
Abnormal
Check to see if the T to see all terminal
est
collector voltage of Resistance of load
VD554 is 18V Is normal
Normal Abnormal Normal Abnormal
Check to see Check the control Check switch Check to see if
if , 9v, voltage of V552 or power unit rectifying tube
5v is normal CPU power is normal
Normal Abnormal Normal Abnormal
Check The failure of Change Check the
N701,N101 horizontal unit or rectifying tube Loader
N101
Maintenance Service and
Trouble Shooting
2 No raster
Whether G2 voltage is normal
Normal Abnormal
Check heating voltage Check base voltage H-drive
Normal Abnormal Normal Abnormal
Check the voltage Heater Resistor Check to see if b.e Check the circuit
open voltage of V433 is from pin13 of N201 to
of all pins of XP902
is normal existed? H-drive
Abnormal Abnormal
Normal Normal
Video amplifying Inspect the circuit Check the voltage InspectT431R434
board is abnormal from pin19 20 of V433 collector is etc.
21 of N201 to normal
video amplifying Higher Lower
board
V433 is not well T431V433 Or
welded or open C415C416 Care
broken
Normal Abnormal
Check N201 Replace bad cmponents
Normal Abnormal
Check N201 and Check +12V power circuit
H-Vibration
Maintenance Service and
Trouble Shooting
Horizontal bright line
3
Make R451 open. Multimeter is at range R1K. Red
probe connects to ground. Touch No.5 of N401 with
black probe. Bright line flashes for a moment
Yes No
There is trouble in V-circuit There is trouble in V-output circuit
Check
Check the voltage at Pin2 of N401
Normal Abnorma Yes No
l
Replae components Check N201 and Check if the vertical deflection Inspect +24V
N701 Deflection yoke plug power circuit
Maintenance Service and
Trouble Shooting
4 Lack of red
Check to see if V902 is
open or not well welded
Change V902 or Check to see if voltages of XP902
weld V902 again are normal
Yes No
Replace CRT Check ircuit between
Pin19 of N201 and
XS202
5
Picture exists but no sound
Cut of C601connect red pen of multi-meter(R*1K)with
ground,and black pen tap Pin1 of N602 if there is snapping
Yes No
Power amplifier is normal. Cut off collection electrode of V602,use
Check N101 and external SIF black pen of multimeter tap Pin1 of
circuit N601 if there is snapping sound
Yes No
Check muting circuit Check to see if
and V601\V602 +19V exists
Normal Abnormal
Check SIF circuit and speaker Inspect +19V
power supply
Circuit Diagram
11. Circuit Diagram
1. Pane hint picture
Sound Power
Amplifier
Picture/Sound IF Amplifier,
Video and audio signal
Processing,
SAW RGB Output Circuits CRT
and H &V Sync pulse
segregation Horizontal Scan
Output
Vertical Scan
Output
ROM
Main Processor
Audio/Video In/Out
Infrared Receiver Remote Controller
Figure 5
Circuit Diagram
2
HA6019
T101
RL551
SDT-SS-112LMR
Figure 6
PCB Diagram
3. PCB Diagram
Figure 8
Circuit Explanation
12. Circuit Explanation
1. Principle integrated circuits
A1. HTN19R12 color TV set composed of the following sections
(1) Small signal processing: super monolithic integrated circuits N204(LA76814A).
and memory N901 (AT24C08).
(2) Sound power amplifying: integrated circuits N701 ( LA4525).
(3) Horizontal and Vertical scan output circuits: Vertical output integrated circuits
N402 (LA78040), Horizontal output transistor V411 (TT2140), Horizontal flying
back transformer T402 (JF0501-19810).
(4) Switch power supply: switch transformer T501 (BCK-01-90II), power transistor
V503 (2SD4460).
A2. Main integrated circuits:
(1) LA76814A Microprocessor
Picture IF/sound IF/video processing/H and V
Scan/color decoding
(2) LA78040 Vertical output integrated circuits
(3) LA4525 Sound power amplifying integrated circuits
A3. Electrical circuit analysis
1Microprocessor and Small signal processing: super monolithic integrated circuits
LA76814A
LA76814A is super large integrated circuit decoder, containing intermediate image
amplifying, intermediate sound amplifying, horizontal and vertical scan, small
signal processing, color decoding, hi-pressure tracing and over-load protection,
I2C bus control.
Information introducing functions and testing data for maintenance is listed in Table 1.
1. N701 LC863424B
PIN Leads Function Voltage (V) PIN Leads Function Voltage (V)
1 Auto adjust Enable Pin 5.1 19 OSD red signal output 0.09
2 Blank 20 OSD greem signal output 0.09
3 IIC data 4.6 21 OSD blue signal output 0.09
4 IIC clock 4.5 22 OSD blank signal output 0.01
Circuit Explanation
5 Earth 0 23 Blank 5.1
CPU
6 2.2 24 MUTE control 0.02
Crystal oscillation port
CPU
7 2.75 25 Blank 5.07
Crystal oscillation port
8 Power (+5V) 5.1 26 AV option control 2 0.01
9 Plate control input 0.25 27 Av option control 1 0.01
10 AFT signal input 0.3 28 Control signal input 5.1
Right channel sound volume
11 Blank 29 0.01
PWM output port
Left channel sound volume
12 S terminal input test 5.1 30 0.01
PWM output port
13 CPU reset port 5.1 31 Blank
14 OSD filter 3.55 32 Demagnetize 0.007
15 Video signal input 3.2 33 Blank
POWER ON/OFF
16 0.03 34 Blank
control signal output
17 Field pulse input 4.8 35 Blank
18 Line pulse input 4.3 36 Blank
2. N101 LA76814K
Working Working
PIN Leads Function PIN Leads Function
Voltage (V) Voltage (V)
1 Video output 2.23 28 Reciprocal pulse input 1.06
2 FM filter output 2.23 29 Reference current 1.69
3 AGC filter 2.22 30 Clock output 0.002
4 Hi AGC output 2.59 31 N.C. 0.002
5 MF input 1.30 32 OSD gain control 3.05
6 MF input 2.83 33 GND 0
7 GND 2.83 34 X ray protection 0.06
8 Power 0 35 ACC KILLER FILTER 0.39
Circuit Explanation
9 FM filter 4.94 36 CHROMA AFC-F 3.49
10 AFT output 1.90 37 CW3.58MHz OUT 0.54
Circuit Explanation
11 Data bus 2.77 38 2.87
12 Clock bus 4.85 39 Auto color filter 3.2
13 Beam input 4.76 40 Video output option 2.43
14 R input 3.92 41 GND 0
15 G input 0.14 42 Outside video input 2.55
16 B input 0.15 43 Power 5
17 Beam limit 0.08 44 Inside video input 2.77
18 RGB Power 7.94 45 lack strech delay filter 2.6
19 R input 2.21 46 Video output 2.12
20 G input 2.36 47 Auto phase control filter 3.5
21 B input 2.28 48 VCO COLL 4.3
Line synchronized
22 0 49 VCO COLL 4.3
output
Field sawtooth wave
23 2.47 50 FILL FILTER 2.24
output
24 Field incline gain 2.65 51 Outer sound input 2.12
25 Power 5.10 52 SIF output 1.95
26 AFC filter 2.49 53 SIF auto phase control filter 2.38
27 Line output 0.63 54 SIF input 3.14
2. Service mode and adjusting items and data
1. Method
a. Press PRO button to enter the adjustment or setup mode.
b. Press CH+ or CH- button to turn page up or down for desired item options. If a special remote
controller is used for options, part of adjustment items can be selected directly by pressing buttons on the
remote controller.
c. Press VOL+ or VOL- button to alter the value of selected adjustment items.
d. In the factory production process, the factory adjuster is sued for accelerated adjustment.
Circuit Explanation
2. Notices for adjustment
OSD Range Ref.
B/W BALANCE
S-BRI 0-127 80
R-BIA 0-255 82
G-BIA 0-255 180
B-BIA 0-255 144
R-DRV 0-127 58
G-DRV 0-15 7
B-DRV 0-127 63
C. B/W 0-3 0
ADJUST
H. PHASE 0-31 17
H.BLK.LEFT 0-7 7
H.BLK.RIGHT 0-7 0
V. SIZE 0-127 39
V. LINE 0-31 10
V. POSE 0-63 56
V. SC 0-31 0
RF. AGC 0-63 20
OSD H.POSI 0-127 10
OSD V.POSI 0-31 3
VOLUME OUT 0-127 100
SETUP
STEREO OPTION 0-1 0
SUB.CONT 0-31 20
SUB.COLOR 0-63 25
SUB.SHARP 0-31 10
SUB.TINT 0-63 32
BLK.STR.DEF ( 0On; 1: Off) 0-1 0
AFC GAIN (0: Low; 1: Hi) 0-1 1
V.SEPUP (0: Low; 1: Hi) 0-1 1
CD.MODE (LA76814: 0/1; LA76812: 0~7) 0-1 0
DIGITAL OSD (0: Simulation OSD input; 1: Digit OSD input) 0-1 0
OSD CONT. (0~127) / LA76814 (0~3) 0-3 2
Circuit Explanation
GRAY MOD (0/1) 0-1 0
OSD Description Range Ref.
B.GAM.SEL (0~3) 0-3 3
RG.GAM.DEF (0/1) 0-1 0
FBPBLK.SW (0/1) 0-1 0
BRIGHT ABL.TH Bright. Abl. Threshold (0~7) 0-7 4
EMG.ABL.DEF Emg. Abl. Def (0/1) 0-1 1
BRT.ABL.DEF Brt. Abl. Def (0/1) 0-1 1
MID.STP.DEF Mid. Stp.Def (0/1) 0-1 1
R-Y/B-Y G.BL R-Y/B-Y Gain Balance (0~15)
0-15 8
LA76814, no this function
R-Y/B-Y ANG R-Y/B-Y Angle (0~15) 0-15 8
C.KILL.OFF C_Kill OFF (0/1) 0-1 0
SND.TRAP Sound Trap (0~7) 0-7 4
VOL.FIL "Volume Filter Defeat" 0-1 0
VIF.SYS.SW (0:45.75M; 1:58.75M) LA76814 0-1 0
VIDEO.LEVEL Video Level (0~7) 0-7 7
FM.LEVEL FM Level (0~31) 0-31 16
POWER OPTION 0: 2 starts; 1: memory; 2 or 3: 1 start 0-3 0
SEARCH CHECK 0: w/out start auto search; 0-1
0
1: w/ start auto search
SEARCH SPEED 0: search slow; 1: search fast 0-1 1
AV OPTION 0: w/out AV; 1: 1-way AV input; 2: 2-way AV
0-3 1
input; 3: 3-way AV input
POSITION L/R 0: top left corner; 1: top right corner 0-1 1
BLACK BACK 0: No black back; 1: Black back 0-1 1
BLACK TRANS 0-1 1
V.MUTE P.OFF 0: video output not cut before POWER OFF;
0-1 0
1: video output cut before POWER OFF
CCD OPTION 0: CCD not used; 1: CCD used 0-1 1
V-CHIP OPTION 0: V-CHIP not used; 1: V-CHIP used 0-1 1
PASSWORD OPT. 0: V-CHIP not used; 1: V-CHIP used 0-1 1
TUNER OPTION 0:TDF-3M3 not used; 1: PHILIP UV1336B used 0-1 1
SCREEN OPTION 0:w/out curtain; 1: w/ at start; 2: w/ at close; 3:
0-3 0
w/ at start/close
SCREEN TIME 0-7 6
SCREEN HDC 0-63 0
Circuit Explanation
BAND SELECT 0-1 0
3.Circuit signals processing
(1) MF amplifying circuit
Received by antanna and processed by the high frequency tuner, the television signals will be transmitted by the
tunner as 45.75MHZ signals to sound surface filter through C112 coupling after being amplified by V102, and
then the MF signals of trapped wave in sound carrier wave from sound surface filter F45U will be sent to pin 5
and 6 of LA76814. The MF demodulation circuit of this TV set is completed through PLL carrier wave
generator and outside pressure control oscillator (T101) in LA76814. The MF frequency is adjusted by T101
adjustment, and output of AFC is generated by a numerical control IF-PLL circuit, and read and sent to CPU by
I2C bus for correction of MF signals frequency deviation. The external capacitor of pin 3 decides the time
constant of AGCand high frequency amplication AGC will be transmitted by I2C bus through pin 4 for control
of high frequency tuner gain.
(2) Sound signals processing
The secondary sound MF signals are input via pin 54 of LA76814, and then demodulated in PLL tuner through
lowpass and limit inside LA76814. After demodulation, the sound signals will be amplified through inside
lowpass and transmitted via pin1. Pin 2 is FM output, C121 is deaccentuation capacitor, pin 9 is FM detector's
DC filter connector and C117 is filter capacitor. The external AUDIO signals are input via LA76814 pin 51,
controlled by CPU. A swith inside I2C bus control LA76814 can be used for options of internal and external
signals. The sound signals are transmitted via LA76814 pin 1 to LA4225A pin 1 via C601 coupling and
transmitted from its pin 4, after being amplified by LA4225A, to the speaker. The mute circuit 1 is comprised
of V601, V602 and other components for Power On and Off mute. Circuit 2 is comprised of CPU mute pin
V603 and other components.
(3) Line sync processing circut
The line oscillation circuit of the TV set is fully comprised of LA76814 internal integrated components. The
brightness signals containing compound sync signals are transmitted to the internal sync seperation circuit for
line and field sync pulse.
(4) Line output circuit
Standard line oscilation pulse is output via pin 27 to V431 for line drive. T431 is H (L) drive used to convert the
low current and high pressure pulse signals from line tube into low voltage and large current signals for line
export needs. V432 is line output, C435 and C436 are reciprocal capacitor, C441 is S calibration capacitor,
L441 is line linear indutance and T471 is line output transformer. 240V voltage needed for field scanning is
transmitted via winding 10 of the transformer and gained after being rectified by VD472. In addition to anode
Circuit Explanation
high pressure, screen grid and focus voltages, the transformer provides 180V video amplifier voltage by
winding 2. VD411, C411, R412, VD412, R414 and C412 form the X ray protection circuit. R233, C231, R232,
R403 and C408 form the beam restriction circuit. The winding 9 of the transformer provides CRT filament
voltage.
(5) Field sync and output circuit
Field sync seperator produces field sync signals from compound sync signals and activates the field frequency
splitting system. When a certain number field sync pulse is detected, the field frequency spliting system will
start operation for frequency spliting of the muliple line frequency signals generated by the line frequency
oscilator. The field pulse gained from frequency spliting will be sent to field sawtooth generator for sawtooth
waves, and then transmitted by pin 23. The output circuit of this TV set is mainly comprised of LA7840 and
other components.
(6) CRT output circuit
The tricolor signals produced by LA76814 will be transmitted to CRT board and then to the cathode of the TV
tube after being amplified by videoamplifier which is comprised of V902, V912 and V922.
(7) CCD performance
The CVBS signals produced by LA76814 pin 40 will be amplified and sent to N701 pin 19 via V821 and then
processed by software and hardware inside CPU. The decoded CCD signales will be transmitted to LA76814
pin 14, 15 and 16 via CPU pin 22, 23 and 24.
(8) V-CHIP performance
Performance of V-CHIP is mainly completed by CPU. The CPU receives grade signals from the IC bus and
executes relative performances and shields those programs of relative grade.
4. Electric diagram (see attached page)
IV. Integrated circuit reference
1. All integrated circuit voltages
Following voltage data is achieved while the TV set is turned on, and the electric resistance is achieved when
the TV set is turned off. When the status changes, the data should also be changed. So these data are used as
references.
Circuit Explanation
1. N701 LC863424B
PIN Leads Function Voltage (V) PIN Leads Function Voltage (V)
1 Auto adjust Enable Pin 5.1 19 OSD red signal output 0.09
2 Blank 20 OSD greem signal output 0.09
3 IIC data 4.6 21 OSD blue signal output 0.09
4 IIC clock 4.5 22 OSD blank signal output 0.01
5 Earth 0 23 Blank 5.1
CPU
6 2.2 24 MUTE control 0.02
Crystal oscillation port
CPU
7 2.75 25 Blank 5.07
Crystal oscillation port
8 Power (+5V) 5.1 26 AV 2 0.01
9 Plate control input 0.25 27 Av option control 1 0.01
10 AFT signal input 0.3 28 Control signal input 5.1
Right channel sound volume
11 Blank 29 0.01
PWM output port