Haier 29F9B-P User manual

29F9B-P
Service Manual
COLOUR TELEVISION
I. Precaution.................................1
Specifications..............................7
2.
Alignment and Adjustments.........9
3.
SchematicDiagrams...................47
8.
BlockDiagram.............................46
7.
ElectricalParts List.....................27
6.
Exploded Views and PartsList....26
5.
Troubleshooting...........................21
4.
Features
2
I C bus control
Haier group
Super woofer
Surround stereo
Auto-correcting black balance
Multi-picture mode,multi-sound mode selection
Stage curtain for on/off effect
218 programmes stored

1.PRECAUTIONS
INPORTANT 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.
1

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.
2

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.)
3

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.(500o F to 600o F)
b. Heating the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-type solder removal device
with solder braid.
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
6. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.(500o F to 600o F )
b. First, hold the soldering iron tip and solder the strand against the component lead until
the solder melts.
c. Quickly move the soldering iron tip to the junction of the component lead and the
printed circuit foil, and hold it there only until the solder flows onto and around both
the component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
d. Closely inspect the solder area and remove any excess or splashed solder with a small
wire-bristle brush.
Remove /Replacement
Some chassis circuit boards have slotted holes (oblong) through which the IC leads are
inserted and then bent flat against the circuit foil. When holes are of slotted type, the
following technique should be used to remove and replace the IC. When working with boards
using the familiar round hole, use the standard technique as outlined .
Removal
Desolder and straighten each IC lead in one operation by gently prying up on the lead with the
soldering iron tip as the solder melts.
Draw away the melted solder with an anti-static suction-type solder removal device (or with
solder braid) before removing the IC.
4

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.
5

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.
6

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. Technical specifications
 Power supply: AC 150V-250V, 50/60 Hz
 Tuning system: voltage synthesized type auto-search fine tuning system
 IF: 38MHz
 Power consumption: ≤140W
 Antenna input impedance: 75Ω
 Receiving system:
a) Color system: PAL/ NTSC3.58MHZ/4.43MHZ
b) Broadcast TV system: B/G,
 Language displayed: English
 Video input: 1.0VP-P (75Ω)
 Video output: 1.0VP-P (75Ω)
 Audio input: 436m Vrms (40KΩ)
 Audio output: 436m Vrms (more than 600KΩ)
7

Products functions
TYPE
FUNCTIONS
29F9B
TYPE
FUNCTIONS
29F9B
IC TDA8844/8843 Audio output power(w) 5W+5W+8W
Tube 29″FS Super woofer √
Color system PAL、NTSC NO of built-in speakers 5
Broadcast system B/G、D/K、I 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
γadjustment √AV in √
Dynamic high voltage stabilizing √AV out √
Dynamic focusing S terminal √
Double focusing DVD signal input
Dynamic white peak clipping KARAOK terminal
Color resolution lift √Stereo headphone socket
4：2：2 PIC window positioning 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
TERMINA
LS
DC current output
Video signal digitalization Timer off(MINS) √
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
I2C 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)
≤140W
Memo book/gamesVoltagerange(V)
Favorite channels Power frequency(Hz) 50HZ
Child lock √Packaged weight(Kg) 45Kg
SPECIFICA
TIONS
Packaged dimensions(mm)
Type of power plug
I
M
A
G
E
OTHER V-CHIP、CCD
Attention:√：already have；*：you can choose it or not
8
AC150V-250V

3.Alignment and Adjustment
Functions:
 Complete frequency range CATV (470MHz)
 Preset of 218 programs. Curtain-drawing type of display when powered up.
 Various kinds of picture modes and sound modes
 Screen display of menu in English
 Program scan
 Surrounding stereo
 I2C bus control with digital technology
 Stereo earphone jack
 Zooming of pictures
9

Control
Local control buttons
①Local menu selecting button
②TV/AV selecting button
③Volume tuning button (increase)
④Volume tuning button (decrease)
⑤Program number tuning button (down)
⑥Program number tuning button (up)
Remote control button
①Power/standb
y
b
utton
②Pro
g
ram number
b
utton
③Screen dis
p
la
y
b
utton
④Hel
p
b
utton
⑤Picture mode button
⑥Sound mode button
⑦Set
p
icture menu button
⑧Set sound menu button
⑨Mute button
⑩Volume u
p
/down button
(11) Pro
g
ram u
p
/down button
(12) Timed switch off button
(13) Pro
g
ram swa
p
b
utton
(14) Pro
g
ram scan button
(15) Picture zoo
m
button
(16) Set function menu button
(17) Menu confirmin
g
button
(18) Menu selectin
g
button
(19) TV/AV alteration button
10

Brief operation instructions
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. Follow the steps below.
A．Program preset
1. Auto searching and storing program
Press MENU or TUN to enter the Search Menu. Press Program up/down buttons to select
COLOR SYSTEM and SOUND SYSTEM. Press VOLUME buttons to select the system.
Press Program up/down buttons to select AUTO SEARCH and press VOLUME buttons to
search automatically. When the search finishes, all the programs will be stored
automatically and the TV returns to normal status.
2. Manual search and fine tune
Press MENU or TUN repeatedly to enter the Search Menu. Press Program up/down
buttons to select COLOR SYSTEM and SOUND SYSTEM. Press VOLUME buttons to
select the system. Press Program up/down buttons to select FREQUENCY RANGE and
PROGRAM NUMBER. Press VOLUME buttons to set and Program up/down buttons to
select MANUAL CHANNEL SEARCHING. Press VOLUME buttons to search manually.
When the search finishes, all the programs will be stored automatically and the TV returns
to normal status. If the effect is not good, press Program up/down buttons to select FINE
TUNE and press VOLUME buttons until the optimum effect is achieved.
3. Deleting channel number
Press MENU or TUN repeatedly to enter the Search Menu. Press Program up/down
buttons to select SKIP. Press VOLUME buttons until the OFF item lights. Now the
program number is deleted. Repeat the above steps, when the item lights, the deleted
program number can be resumed.
B．Volume tuning
Press VOLUME buttons to increase or decrease the volume.
C Personal preference setting
1. Picture effect
Press P.STD repeatedly to change among PERSONAL, STANDARD, DYNAMIC, SOFT
and NATURAL.
2. Sound effect
Press S.STD repeatedly to change among PERSONAL, STANDARD, MUSIC, FILM and
LANGUAGE.
11

Disassembly instructions
A. Important note
This set is disconnected from the power supply through the converter transformer. An
isolating transformer is necessary to service operations on the primary side of the converter
transformer.
Back Cabinet Removal
Remove the screw residing on the back cabinet and carefully separate the back cabinet from
the front cabinet.
B. Picture tube handling caution
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.
Functions and working voltage of major IC pins
(Note: All the data below have been measured at Channel 1 with color bar signals. The
pictures and sounds are all set in the standard status)
1．WH2001
Pin No. Functions Working voltage (V)
1 Tuning voltage output 4.52
2 UHF 0
3 VHF-H
4 VHF-L
5 B/G
6 D/K 0
7 I
8 M 0
9 Control button input 0
10 Control button output 0
11 Magnetic
12 PAL/NTSC
13 Ground 0
14 Relay 0
15 Pre-eyesight
12
00
0
1
1
0
1
4.87

Pin No. Functions Working voltage (V)
16 DVD 0
17 Mute 0
18 Timer 0
19 RC 0
20 Power 0
21 Halftone 0
22 OSD B signal output 0
23 OSD G signal output 0
24 OSD R signal output 0
25 BLANK signal output 0
26 Line synchronous signal input 0
27 Pattern synchronous signal input 0.2
28 OSD-XIN 5
29 OSD-XOUT 0
30 Ground 0
31 OSD crystal oscillation 2.2
21 OSD crystal oscillation 2.63
33 Reset button 0
34 Power supply 5
35 S.Bass 5
36 Remote control receiving input 5
37 Ground 5
38 Bus.stop 5
39 S-VHS 5
40 AV1/AV2 5
41 SCL 4.23
42 SDA 4.23
2．N301 TDA8844/8843
Pin No. Functions Working voltage (V)
1 Intermediate frequency input of No.2 sound 0.2
2 External audio input 3.69
3 Blank 0
4 Blank 0
5 PLL loop filter 2.48
6 Video output 2.97
7 Clock bus 4.23
8 Data bus 4.27
9 Trap filter decoupling 6.7
10 SVHS-C input 1.16
13

Pin No. Functions Working voltage (V)
11 SVHS-Y input 3.99
12 Working power 8
13 Internal video input 3.67
14 Earth 0
15 Audio output 2.97
16 SECAM decoding and decoupling 0.42
17 External video input 3.4
18 Dark current test input 5.5
19 B output 3.09
20 G output 3.27
21 R output 3.16
22 Beam current limit and field protection 2.19
23 R input 3.48
24 G input 3.48
25 B input 3.48
26 Blanking 0
27 Y signal input 2.94
28 Y signal output 2.75
29 B-Y output 2.31
30 R-Y output 2.3
31 B-Y input 2.4
32 R-Y input 2.67
33 Standard color sub-carrier output 4.26
34 3.58 M crystal oscillation 2.52
35 4.43 M crystal oscillation 2.52
36 Chrominance decoding filer 4.94
37 Working power supply 7.97
38 CVBS switch output 2.17
39 Power decoupling 5
40 Line oscillation output 3.32
41 Line retrace input and sandcastle pulse input 0.76
42 PH1-1 filter 3.05
43 PH1-2 filter 4.05
44 Earth 0
45 E-W calibration output 3.40
46 Field drive positive output 1.26
47 Field drive negative output 1.3
48 Intermediate frequency input 4.60
49 Intermediate frequency input 0.32
50 EHT tracing and overvoltage protection 2.05
51 Field sawtooth wave forming capacitance 3.77
14

Pin No. Functions Working voltage (V)
52 Field reference current forming 3.87
53 AGC decoupling 4.25
54 High amplifier AGC output 6.52
55 Audio deemphasis 2.91
56 Sound demodulation and decoupling 2.07
3. N502 SAA4961 Integrated comb filter
Pin No. Functions Working voltage (V)
1 Standard color sub-carrier input 4.3
2 Earth 0
3 Earth 0
4 Earth 0
5 Band-pass filter decoupling 1.27
6 Earth 0
7 Simulated power 4.85
8 Simulated power buffer 4.83
9 Simulated earth 0
10 External chrominance signal input (blank for this set) 1.39
11 Earth 0
12 Chrominance signal input 1.3
13 Earth 0
14 Brightness signal output 1.65
15 Blank 1.66
16 Earth 0
17 CVBS input 1.55
18 Blank 1.5
19 Storage capacitance 1.47
20 System selection 0
21 Digital earth 0
22 Digital power supply 4.82
23 System selection 2 3.98
24 Delay line decoupling capacitance 1.28
25 Comb filter output 4.8
26 PLL earth 0
27 PLL power supply 4.85
28 Earth 0
4. N450 TDA9178 Picture intensifier circuit
Pin No. Functions Working voltage (V)
1 Sandcastle pulse input 0.78
15

Pin No. Functions Working voltage (V)
2 Blank 0
3 ADC input 0
4 ADC input 0
5 ADC input 0
6 Brightness signal input 2.74
7 Address selection input 0
8 U signal input 2.31
9 V signal input 2.30
10 Blank 0
11 Clock line 4.23
12 Blank 0
13 Blank 0
14 Data line 4.27
15 Power supply 5
16 V signal output 2.69
17 U signal output 2.63
18 Earth 0
19 Y signal output 2.98
20 Power supply 7.85
21 Scanning speed modulation output (blank for this set) 2.56
22 Flashing control output 7.84
23 Blank 0
24 Blank 0
5. N801 TDA8351Field scanning output circuit
Pin No. Functions Working voltage (V)
1 Positive polarity input 1.26
2 Negative polarity input 12.23
3 Power A
4 Output B 6.08
5 Earth A0
6Flybackpower 45
7 Output A 6.31
8 Earth B0
9 Compensation 5.21
6. N601 TDA9860 Multi-function TV stereo sound processing circuit
16
15
current input

Pin No. Functions Working voltage (V)
1 AV1 audio input (left) 4.01
2 Blank 0
3 Main signal audio input (left) 4.01
4 Reference voltage filter capacitance 7.95
5 Main signal audio input (right) 4.01
6 Power supply 8.02
7 AV1 audio input (right) 4.02
8 Earth 0
9 Audio output to Pin 10 4.02
10 Audio input (from Pin 9) 4.02
11 Woof capacitance (right 1) 4.02
12 Woof capacitance (right 2) 4.02
13 Woof output (right) 4.02
14 Treble control capacitance (right) 4.02
15 Main sound frequency output (right) 4.02
16 Clock bus 4.23
17 Data bus 4.27
18 Main sound frequency output (left) 4.02
19 Treble control capacitance (left) 4.02
20 Woof output (left) 4.02
21 Woof capacitance (left 2) 4.02
22 Woof capacitance (left 1) 4.02
23 Audio input from Pin 24 4.02
24 Audio output (to Pin 23) 4.02
25 Earth 0
26 AV terminal audio output 4.02
27 Pseudo stereo control capacitance 1 4.02
28 AV2 audio input (right) 4.02
29 Pseudo stereo control capacitance 2 4.02
30 AV2 audio input (left) 4.02
31 Earth 0
32 AV1 audio input (right) 4.02
17

10. N1602 TDA2616 super integrated power amplifier circuit with mute
Pin No. Function Working voltage (V)
1 Super treble input 10.82
2 Mute control input 21.7
3 Semi power input 10.84
4 Amplified output 1 10.85
5 Earth 0
6 Amplified output 2 10.83
7 Power supply 21.73
8 Positive output terminal 10.84
9 Negative output terminal 10.82
11. N1603 TDA 2616 super woof integrated amplifier circuit with mute
Pin No. Function Working voltage (V)
1 Mediant input 10.82
2 Mute control input 21.7
3 Semi power input 10.87
4 Amplified output 1 10.81
5 Earth 0
6 Amplified output 2 10.85
7 Power supply 21.70
8 Positive output 10.87
9 Negative output 10.78
18

Adjustment
A. Safety precautions
1. It is safe to adjust after using insulating transformer between the power supply line and
chassis input to prevent the risk of electric shock and protect the instrument.
2. Never disconnect leads while the TV receiver is on.
3. Don't short any portion of circuits while power is on.
4. The adjustment must be done by the correct appliances. But this is changeable in view of
productivity.
B. Adjustment procedure
The chassis of this TV set uses Philips single chip 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: 127±0.5V adjustment
1) Switch on the power and connect PAL circular signals to the modulator.
2) Turn the acceleration pole anti-clockwise fully. Adjust potentiometer VR701 until the
voltage of the main power is 127±0.5V.
2. Screen voltage adjustment
1) Switch on the power and receive PAL system circular signal. Warm up the TV set for 15
min.
2) Press factory handset SERVICE button to enter the adjustment status. Press MENU
button twice. After the screen displays MENU3, press button 0 and a horizontal bright
line appear. Adjust screen potentiometer to let the horizontal bright line just appears.
3. Focus adjustment
1) Receive electronic circular signal
2) Set contrast control to max.
3) Set brightness control to middle
4) Adjust focus potentiometer F1 and F2 until the optimum picture is achieved
4. AGC adjustment
1) Switch on the power and connect signals to the modulator. Receive PAL system color bar
19