Service Manual
HT-2599
COLOUR TELEVISION
Precautions.................................1
I.
Specifications..............................7
2.
Alignment and Adjustments.........9
3.
Schematic Diagrams...................43
8.
Bolck Diagram.............................42
7.
Electrical Parts List.....................29
6.
Exploded Views and Parts List....28
5.
Troubleshooting...........................22
4.
Features
2
I C bus control
Turning TV on/off with curtain-fashion
218 programmes stored
Entire channel CATV(470MHZ)
Multi-picture and multi-volume modes selection
Audio/Video input and output,S-Video terminal
Black background protection without signal
On-time,off-time,appointing programme
English OSD
Childlock
Haier group
1.PRECAUTIONS
IMPORTANT SAFETY NOTICE
These parts are identified by many electrical 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.
SERVICEING PRECAUTIONS
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
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.)
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
o
F to 600
o
F.
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 600
o
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 600
o
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.
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.
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.
2. specifications
• Power Supply: 150~250V 50/60 HZ
• Tuning System: voltage synthesized
• IF: 38.9 MHz
• Power Consumption: 120W(HT-2599)
• Antenna input impedance: 75Ω
• Receiving System: PAL SECAM B/G D/K
• Language displayed: English
• Video Input: 1.0Vp-p (75Ω)
• Video Output: 1.0Vp-p (75Ω)
• Audio Input: 436mVrms (40Ω)
• Audio Output: 436mVrms (over 600Ω)
Products functions
TYPE
FUNCTIONS
HT-2599
TYPE
FUNCTIONS
HT-2599
IC TB1238 Audio output power(w) 3W
Tube FS Super woofer
Color system
PAL,SECAM
NO of built-in speakers 2
Broadcast system B/G,D/K Analog surround stereo
No.of preset channels 218
Treble/bass lifting and
balancing
CATV band width 470MHZ Multiple audio mode
Blue/black screen Black AV stereo
Menu OSD
Digital reverberation
OSD language English Tone control
Manifold PIC modes
Auto volume leveling
Program preview
Mute
Y/C separation circuit 3D surround sound
Denoise circuit SRS
Black level extend MAX volume preset
Blue level extend 5 bands equalizer
Auto skin color correction
AUDIO
NICAM
adjustment
AV in
Rear 1
Dynamic high voltage stabilizing AV out
Rear 1
Dynamic focusing S terminal
Double focusing DVD signal input
Dynamic white peak clipping KARAOK terminal
Color resolution lift Stereo headphone socket
I
M
A
G
E
4 2 2 PIC window positioning
TERMINA
LS
VGA
Pull-curtain type on /off display
NO. of Australian standard
sockets
Artificial intelligence Service terminal
SVM
HI-FI audio signal output
terminal
CTI External super bass terminal
LTI DC current output
Video signal digitalization Timer off(MINS) 120
Teletext Timer on
Still frame Auto off upon no signal
Multi PIC Frames AC off
PIP independent tuner Stand by
PIP double tuner Frequency synthesis tuning
PIC out PIC Tension synthesis tuning
9 programs preview
Automatic color system
identify
100Hz
I
2
C bus-mastering
ZOOM AV in AV out
Stepless zoom in/out Wireless earphone(infrared)
16 9 mode
Handset position
notify(beep)
Logo configure Automatic channel preset
Skip
Partial automatic channel
preset
Supper receiver
CONTROL
Manual channel preset
Calendar Total power input(W) 120W
Memo book/games Voltage range(V) 150-250V
Favorite channels Power frequency(Hz) 50HZ
Child lock Packaged weight(Kg) 35Kg
SPECIFICA
TIONS
Packaged dimensions(mm) 755X535X625
Type of power plug
OTHER
V-CHIP CCD
Attention: already have * you can choose it or not
3.Alignment and Adjustments
Functions:
I
2
C bus control
Turning TV on/off with curtain-fashion
218 programmes stored
Entire channel CATV(470MHz)
Multi-picture and multi-volume modes selection
Audio/Video input and output,S-Video terminal
Black background protection without signal
On-time,off-time,appointing programme
English/Russian OSD
Childlock
Control
Local control buttons
21F99 HT-2599
① Main power switch
② Program tuning button - P + ( -PRO+ )
③ Volume tuning button - +
④ TV/AV alternation button TV/AV
⑤ Menu display button MENU
Remote control buttons
Before using the remote control, press the main power switch to turn on the TV set.
Figure 10
→MEMORY 1→ MEMORY 2 →
↑
←MEMORY 4← MEMORY 3
↵
MODE PICTURE QUALITY
MEMORY 1 DYNAMIC Bright and Dynamic effect
MEMORY 2 STANDARD Standard Picture
MEMORY 3 SOFT Soft Picture
MEMORY 4 SETTING User Set Up Picture Quanlity
Figure 11
TIME SELECTING Press ← or →button
COLOR AUTO→PAL→SECAM
↑
3.58NTSC←4.43NTSC
↵
↑
↓
SOUND BG ⇔ DK
TV/AV alternating: press this button to change from
TV to AV 1 and to S-AV 2.
Picture memory mode: each press of this button will
have a result as shown in Fig. 11 (see figure 11).
Direct program selecting: one-digit number(0-9);
two-digit number(10-99).
Display menu: press the button to display Program
Memory → Picture Quality Selection →Chinese/English
Selection in cycle.
Display picture mode: press the button to select
color, brightness, contrast, picture quality, and blue
background.
Menu adjustment: move up or down to adjust the
item functions.
TV system adjustment: press the button for display
on the screen (as shown in figure 12).
Mute: press the button to stop sound for a short
time, press again to resume the sound.
Timed switch off: press the button to adjust the time
for timed switch off, with the display changing in the
following order: →120 min. →110 min. →100
min…→20 min. →10 min. →OFF. once set, the TV set
will automatically shut off at the set time.
Volume adjustment:
+ press the button to increase volume;
− press the b
utton to decrease volume.
(11) Program adjustment:
+ press the button to increase position number.
− press the button to decrease position number.
(12) Menu selection: press up or down to select menu
functions.
(13) One/two digit position number alternating: press the
button to select one or two digit position number.
(14) Display position number: press the button and the
number of the current program will be displayed on the
screen. Press again and the position number will
disappear.
(15) Remote switch ON and OFF: press the button to
turn off the DC power supply of the TV set. To turn on
the TV set, press again this button or a digit button.
Note: In case of a power failure while watching the TV
or the TV set is not used for a long period of time (in
standby status for over 12 hours), the main power switch
shall be turned off.
Figure 12
Brief operation instructions
PSO MEMORY
8POSITION 01
BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
↓
PSO MEMORY
POSITION 01
BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
(1)Press the [MENU] button and the “POS.
MEMORY” menu will be displayed on the screen;
8AUTO MEMORY
Figure 1
1. Preparation before selecting program
Connect the antenna (or cable television signal) and
power supply line, press power switch , the power
indicator will light on, and the picture will appear in a
few seconds.
2. Auto search of programs
The TV set will automatically search all television
programs, and sequentially store all optimally tuned
positions in each position number after the search is
finished.
(2) Press selection button [-PRO+] or [↑] [↓] to point
the red “►” on the screen to “AUTO SEARCH”;
(3) Press adjustment button [ +] or [→] and the TV
set begins to search programs from “0” until all the
programs are found and the searching is finished with
only position number “0” displayed on the screen;
(4) During auto-search, if you want to stop the
searching, press adjustment button [- ] or [←]. (See
Figure 1)
3. Semi-auto search
With this function, you can preset the program you
need to the pointed channel.
1) Press menu button [MENU] and the “POS.
MEMORY” menu appears on the screen;
2) Press selection button [-PRO+] or [↑] [↓] to point
the red “►” to “POSITION”;
3) Press adjustment button [- +] or [→][←] to
change the position number to your desired number
(e.g. Position 04).
4) Press selection button [-PRO+] or [↑] [↓] to point
the red “►” on the screen to SEARCH.
5) Press adjustment button [- +] or [→][←] to
search upward or downward for TV signals. Stop
searching when a TV program is found, if it is not the
desired one, press[- +] or [→][←] to continue
searching until the your desired program is found;
6)Press menu button [MENU] repeatedly until the
characters on the screen disappear, when the desired
TV signal is already stored at Position number 04. (See
Figure 2)
PSO MEMORY
8POSITION 01
BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
↓
PSO MEMORY
8POSITION 04
BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
↓
PSO MEMORY
POSITION 04
BAND VHFL
SKIP OFF
8SEARCH UP
MFT UP
AUTO MEMORY
↓
PSO MEMORY
POSITION 04
BAND VHFL
SKIP OFF
8SEARCH UP
MFT UP
AUTO MEMORY
Figure 2
PSO MEMORY
8POSITION 01
BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
↓
PSO MEMORY
POSITION 01
8BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
→VHF
L
→VHF
H
→UHF
Figure 3
PSO MEMORY
8POSITION 01
BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
↓
PSO MEMORY
POSITION 01
BAND VHFL
SKIP OFF
SEARCH UP
8MFT UP
AUTO MEMORY
Figure 4
4. Band selection
In semi-auto search, if the program signal you want to
search is not in the current band, you can change the
range to speed up the searching.
1) Press menu button [MENU] and the “POS.
MEMORY” menu will appear on the screen;
2) Press selection button [-PRO+] or [↑] [↓] to point
the red “►” on the screen to “BAND”;
3) Press adjustment button [- +] or [→][←] to adjust
to your desired signal band. (See Figure 3)
5. Usage of fine tuning
For some reasons or the interference of antenna system,
the picture and audio effect of programs searched by
auto search may not be so good, then fine tuning of the
frequency shall be used.
1) Press menu button [MENU] and the “POS.
MEMORY” menu will appear on the screen;
2) Press selection button [-PRO+] or [↑] [↓] to point the
red “►” on the screen to “MFT”;
3) Press and hold adjustment button [- +] or [→][←]
until the optimum picture and audio effects are obtained
and then release the button. (See Figure 4)
6. Skip
After presetting the positions, you can skip the
unnecessary position numbers (such as repeated signals,
pseudo signal, etc.), in order to select only the programs
you need.
1) Press program button [- PRO +](or press digit button
directly), select the position number you want to skip
(take Position 04 as an example);
2) Press menu button [MENU] and the “POS.
MEMORY” menu will appear on the screen;
3) Press selection button [-PRO+] or [↑] [↓] to point
the red “►” on the screen to “SKIP”;
4) Press adjustment button [- +] or [→][←] to turn it
ON. (See Figure 5)
Note: When a certain position number is in SKIP ON
mode, this position number will not appear when you
select the programs with [-PRO+] button. (But with
direct selection buttons, the number will appear.) When
a certain position number is in the SKIP OFF mode, the
position number will appear when you select the
programs with [-PRO+] button.
4
↓
PSO MEMORY
8POSITION 04
BAND VHFL
SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
↓
PSO MEMORY
POSITION 04
BAND VHFL
8SKIP OFF
SEARCH UP
MFT UP
AUTO MEMORY
Figure 5
Picture quality selection
The [MENU] button is a multi-functional button. By pressing this repeatedly, you can select
the Picture Quality Menu and select the adjustment of color, brightness, contrast, picture
quality, blue background. (See Figure 6)
ITEM PRESSING
- +
+ COLOUR PALER DEEPER
BRIGHTNESS DARKER BRIGHTER
CONTRAST WEAKER STRONGER
PICTURE QUALITY SOFTER SHARPER
- BLUE BACKGROUND ON OFF
Figure 6
CONNECTION OF TV AUDIO-VISUAL SYSTEM
Function of terminals on the
back cover:
Aerial input socket
Video input socket
Audio left sound track
input socket
Audio right sound track
input socket
S-video input socket
Video output socket
Audio left sound track
output socket
Audio right sound track
output socket
21F99 HT-2599
Connection of terminal board AV (Audio/Video) input:
If you connect the audio, video outputs of such AV equipment as a video cassette player or
VCD player to the AV input terminals of the TV set, you can enjoy video cassette programs
and VCD.
Connection of audio, video output terminals:
Output terminals can output the picture and sound signals of the program shown on the TV.
These terminals can be used to record the TV program.
• For connection with a video recorder with single track sound, please connect its audio
input line to the audio output left (L) or right (R) terminal of this set.
• S-video input socket and the video input socket may not have input of signal at the same
time. While the signal is inputted to one of them, the input signal plug for the other one must
be pulled out.
Disassembly
A. Important Note
This TV set is disconnected from the power supply through the converter transformer. An
isolating transformer is necessary for service operations on the primary side of the converter
transformer.
Back Cabinet Removal
Remove the screws residing on the back cabinet and carefully separate the back cabinet from
the front cabinet.
B. Explosion view
C. Precautions for handling of picture tube
Due to high vacuum and large surface area of picture tube, great care must be exercised when
handling picture tube. Always lift picture tube by grasping it firmly around faceplate.
NEVER LIFT TUBE BY ITS NECK! The picture tube must not be scratched or
subjected to excessive pressure as fracture of glass may result in an implosion of
considerable violence which can cause personal injury or property damage.
VII. 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)
Reference Resistance(KΩ )
No. Function Reference
Voltage(V)
Forward Backward
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
0.8 0.65 1.4
6 Field power supply 24(26) 0.5 4.5
7 Field power supply input 1.9 0.72 30
N701 LA4275
Reference Resistance(KΩ )
Item Function Reference
Voltage(V)
Forward Backward
1 Grounding 0 0 0
2 Power amplifier output 10 0.55 4.5
3 Power supply 20 0.42 2.8
4 Ripple wave filtering 10 1.2 2.4
5 Grounding 0 0 0
6 Audio Input 0.7 1.1
∞
7 Feedback 0.2 0.72 2.0
N201 TB1238AN
Reference Voltage(V)
Reference Resistance(KΩ )
Pin Function
Without
signal
With
signal
Forward(Ω) Backward(Ω)
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
Reference Voltage(V)
Reference Resistance(KΩ )
Pin Function
Without With
Forward(Ω) Backward(Ω)
signal signal
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
2.4 2.4 750 3000
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
0 0 720 650
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
9.0 9.0 450 600
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
1.5 1.5 800 2000
30 Line feedback pulse input 0.6 0.6 780 2000
31 Composite synchronizing pulse
signal output
4.5 4.5 780 2000
32 Line driving signal 2.7 2.7 640 680
33
Deflection circuit grounding pin
0 0 0 0
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
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
PIF composite video signal input
3.3 3.3 800 2000
44 Black level detection filtering 2.3 2.3 800 4000
45
External chrominance signal input
2.9 2.9 800 2000
46 Y/C circuit power supply 5.0 5.0 500 1200
Reference Voltage(V)
Reference Resistance(KΩ )
Pin Function
Without With
Forward(Ω) Backward(Ω)
signal signal
47 PIF and SIF composite signal
output
3.8 3.8 680 900
48 Intermediate frequency locked
phase loop filtering
4.7 4.7 800 2000
49 VCO and SIF grounding 0 0 0 0
50 Intermediate frequency VCO 8.1 8.1 550 1000
51 Intermediate frequency VCO 8.1 8.1 650 1000
52 VCO and SIF power supply 9.0 9.0 450 600
53 SIF signal input and horizontal
curve correction
4.5 4.5 820 2000
54 SIF smooth filtering 5.6 5.6 800 1300
55 External audio input 4.2 4.2 800 2000
56 FM DC negative feedback 3.5 3.5 800 2000
N901 TMP87CK38N
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
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
output
0 0 620 2200
Reference Voltage(V) Reference Resistance Pin Function
Without With
Forward(Ω) Backward(Ω)
signal signal
23 Green primary color
character output
0 0 620 2200
24 Blue primary color
character output
0 0 620 2200
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
input
4.7 4.7 700 10000
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
Reference
Voltage(V)
Reference Resistance
Pin Function
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
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