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SERVICE MANUAL
Color Television Receiver
Model: TK-A/Q Series
SERVICE MANUAL TK-A/Q
CONTENTS
I. IMPORTANT SERVICE SAFETY INFORMATION........................ 3
II. ALIGNMENT PROCEDURES PLEASE READ BEFORE
ATTEMPTING SERVICE............................................................ 5
III. TV SPECIFICATION............................................................. 6
IV. TV ADJUSTMENT................................................................. 9
V. IC INFORMATION................................................................. 13
1. PHILIPS UOCIII CHIP (N603)................................................................. 13
2. EEPROM 24C16 (N602).......................................................................... 53
3. SWITCH POWER IC (N901)................................................................... 57
4. VERTICAL DEFLECTION BOOSTER (N401)............................................ 61
5. AUDIO POWER AMPLIFIER (N202)........................................................ 66
VI. TV BLOCK DIAGRAM........................................................... 74
IMPORTANT SERVICE SAFETY INFORMATION
Operating the receiver outside of its cabinet or with its back removed involves a shock hazard.
Work on these models should only be performed by those who are thoroughly familiar with
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SERVICE MANUAL TK-A/Q
precautions necessary when working on high voltage equipment.
Exercise care when servicing this chassis with power applied. Many B plus and high voltage
RF terminals are exposed which, if carelessly contacted, can cause serious shock or result in damage
to the chassis. Maintain interconnecting ground lead connections between chassis, escutcheon,
picture tube dag and tuner when operating chassis.
These receivers have a "polarized" AC line cord. The AC plug is designed to fit into standard
AC outlets in one direction only. The wide blade connects to the "ground side" and the narrow blade
connects to the hot "side" of the AC line. This assures that the TV receiver is properly grounded to
the house wiring. If an extension cord must be used, make sure it is of the "polarized" type.
Since the chassis of this receive is connected to one side of the AC supply during operation,
service should not be attempted by anyone not familiar with the precautions necessary when
working on these types of equipment.
When it is necessary to make measurements or tests with AC power applied to the receiver
chassis, an Isolation Transformer must be used as a safety precaution and to prevent possible
damage to transistors. The Isolation Transformer should be connected between the TV line cord
plug and the AC power outlet.
Certain High voltage (HV) maybe cause X-ray radiation. Receivers should not be operated with
HV levels exceeding the specified rating for their chassis type. Higher voltage may also increase the
possibility of failure in the HV supply.
It is important to maintain specified values of all components in the horizontal and high voltage
circuits and anywhere else in the receive that could cause a rise in high voltage, or operating supply
voltages. No changes should be made the original design of the receiver.
Components shown in the shaded areas on the schematic diagram and/or identified by in the
replacement parts list should be replaced only with exact factory recommended replacement parts.
The use of unauthorized substitute parts man creates may create shock, fire, X-ray radiation, or other
hazards.
To determine the presence of high voltage, use an accurate high impedance HV meter
connected between the second anode lead and he CRT dag grounding device. When servicing the
High Voltage System remove static charges from it by connecting a 10K Ohm resistor in series Wan
insulated wire(such as test probe) between the picture tube dag and 2nd anode lead(Have AC line
cord disconnected from AC supply).
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SERVICE MANUAL TK-A/Q
The picture tube use in this receiver employ integral implosion protection. Replace with a tube
of the same type number for continued safety. Do not lift picture tube by the neck. Handle the
picture tube only when wearing shatterproof goggles and after discharging the high voltage
completely, Keep others without shatter proof goggles away.
Before returning the receiver to the user, perform the following safety checks:
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in the receiver.
2. Replace all protective devices such as non-metallic control knobs, insulating fish-papers,
cabinet backs, adjustment and compartment covers of shields, isolation resistor-capacitor networks,
mechanical insulators etc.
3. To be sure that not shock hazard exists, a check for the presence of leakage current should be
made at each exposed metal part having a return path to the chassis (antenna, cabinet metal, screw
heads knobs and/or shafts, escutcheon, etc.) in the following manner.
Plug the AC line cord directly into a 110V/220V/240V AC receptacle. (Do not use an Isolation
Transformer during these checks.) All checks must be repeated with the AC line cord plug
connection reversed. (If necessary, a non-polarized adapter plug must be used only for the purpose
of completing these checks.)
If available, measure the current using an accurate leakage current tester. Any reading of
0.35mA or more is excessive and indicates a potential shock hazard which must be corrected before
returning the receiver to owner.
If a reliable leakage current tester is not available, this alternate method of measurement should
be used. Using two clip leads, connect a 1500 Ohm, 10 watt resistor paralleled by a 0.15MF
capacitor in series with a known earth ground, such as a water pipe or conduit and the metal part to
be checked. Use a VTVM or VOM with 1000 Ohms per Volt, or higher, sensitivity to measure this
AC voltage drop across the resistor,. Any reading of 0.35 volt RMS of more is excessive and
indicates potential shock hazard which must be corrected before returning he receiver to the owner.
ALIGNMENT PROCEDURES
PLEASE READ BEFORE ATTEMPTING SERVICE
1. Use an Isolation Transformer when performing any service on this chassis.
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SERVICE MANUAL TK-A/Q
2. Never disconnect any leads while receiver is in operation.
3. Disconnect all power before attempting an repairs.
4. Do not short any position of the circuit while the power is on.
5. For safety reasons, replacing any components should be according with identical replacement
parts.
6. Before testing, warm up the TV for at least 30 minutes and demagnetize the CRT with an external
degaussing coil.
7. When removing a PCB or related component, after unfastening or changing a wire, be sure to put
the wire back in its original position.
8. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use
only specified silicon grease,. Remove all old silicon when applying new silicon.
9. Before removing the anode cap, discharge drastically because it contains high voltage.
TV SPECIFICATION
1. Ambient Conditions:
1.1 Ambient Temperatures:
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SERVICE MANUAL TK-A/Q
a. Operating: -10 ~ +40
b. Storage: -15 ~ +45
1.2 Humidity
a. Operation: <80%
b. Storage: <90%
1.3 Air Pressure: 86kpa ~ 106kpa
2. General Specification
2.1 Main IC: Philips UOCIII chip
2.2 System: TV PAL DK/BG/I
SECAM DK/BG/L(L')
NTSC M
AV PAL
SECAM
NTSC 4.43/3.58
2.3 Channel: VHF-LOW 46.25140.25MHz
VHF-HIGH 147.25423.25MHz
UHF 431.25855.25MHz
CATV 112.25464.25MHz
2.4 Scanning Lines & Frequencies
525 lines/60Hz or 625 lines/50Hz
15.75KHz/15.625KHz
2.5 Color Sub-Carrier Frequency: 4.433MHz/3.579MHz
2.6 IF: Picture 38.9MHz/38.0MHz/45.75MHz
Sound 4.5MHz/5.5MHz/6.0MHz/6.5MHz
2.7 Power Consumption: 14" and 15" TV 70W
21" TV 75W
29" TV 150W
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SERVICE MANUAL TK-A/Q
34" TV 180W
2.7 Power Supply: AC 110/220/240V 50/60 Hz
2.8 Max Audio Output Power (7% THD): 14" and 15" 1W X 2
21" 1.5W X 2
29" and 34" 4W X 2
2.9 Antenna Impedance: 75
3. Basic Features of Controller
3.1 Channel Tuning Method: Frequency Synthesizer
3.2 Preset table Program: 240 Programs or 100 Programs
3.3 Tuning for VHF and UHF Bands: Auto Tuning/Manual Tuning
3.4 Picture and Sound Adjustment:
Bright, Contrast, Color, Sharpness control and Color Temperature adjustment
TINT control (NTSC only)
Volume, Balance, Bass, Treble control
3.5 OSD:
General Features (Volume, Balance, Bass, Treble, Brightness, Contrast, Color, Sharpness,
Program, Auto Search, Manual Tune, Muting, AV/TV, Child Lock and Sleep Timer)
Multi-Language (including English)
3.6 Sleep Timer: 5 -120 Minutes with 5 Minutes Increment
3.7 Auto Standby When No Signal in 5 minutes
3.8 Full Function Infrared Remote Control
3.9 Remote Effective Distance: 8m
4. Construction of Front Panel
Main Power Switch
Remote Sensor
Standby Indicator
Menu Select Button
TV/AV Select Button
Program and Volume Up/Down Button
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SERVICE MANUAL TK-A/Q
5. TV's Terminals
75 Aerial Terminal
AV Input and AV Output (TK-A Series)
S-Video Input
Y/U/V Input
SCART Input and Output (TK-Q Series)
6. Other Informations
6.1 Magnetic Field: Bv = 0.3~0.65Gs
6.2 Standard Color Temperature: 9300K (X = 0.284, Y = 0.299)
TV ADJUSTMENT
Test equipment
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SERVICE MANUAL TK-A/Q
1. Oscilloscope
2. Multifunction meter (Internal resistance: DC20k/V AC5k/V
3. High voltmeter: 35kV
4. Standard Signal Generator
5. Degaussing coil
Factory menu
Some adjustments must be performed in the Factory menu. You can enter the Factory menu in
the following way:
1. Press the MENU button on the remote control then press the Q.VIEW button on the remote
control at least 5 times immediately.
2. Press the MENU buttons to select the desired Factory menu pages or press 0-9 number buttons to
enter the Factory menu pages directly and then press the PROG.+/- buttons to select the desired
items.
3. Press the VOL+/- buttons to change the settings.
B+ adjustment
Test Equipment: Multifunction meter
1. Operate the TV set with AC 110/220/240V(50/60Hz).
2. Receive Television broadcast signal, set PICTURE to Normal mode.
2. Connect the multifunction meter + lead to C960 and GND. Adjust the RP950 until the meter
reading the proper DC value (More details please refer to the TV's BOM ).
High voltage check and filament voltage check
Test Equipment: High voltmeter
1. Make sure AC power supply and +B are within pointed range before calibrating high voltage.
2. Connect high voltmeter to anode (G4) of CRT and GND.
3. Turn on the TV, set the BRIGHTNESS and CONTRAST to the minimum (zero beam current),
swap to AV mode (No any signal applied).
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SERVICE MANUAL TK-A/Q
4. High voltage please refer to different CRT
5. Filament voltage measured by virtual value meter please see the related model BOM, usually
within the range of 6.3