Port options can be specified independently for each bit.
The programmable pull-up resistors are provided depending on whether CMOS or Nch-OD (Nch open
drain ) is selected as the port 1 option.
3. Refer to Table 3 about Functions and Data of the IC’s Each Pin.
I/O
1-bit input port
(P83 is set only in CH04T1002)
I
4-bit input/output port(P84-P87)
Each bit can be independently programmable
Other function:
AD converter input port
P83
B
P84-P87
X
10
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SERVICE MANUAL
EEPROM AT24C04 (N002)
1. Features
Data EEPROM internally organized as 512
bytes and 32 pages×16 bytes
Low power CMOS
Vcc=2.7 to 5.5V operation
Two wire serial interface bus I
compatible
Filtered inputs for noise suppression with
Schmitt trigger
Clock frequency up to 400 kHz
High programming flexibility
-Internal programming voltage
-Self timed programming cycle including erase
-Byte-write and page-write programming
between 1 and 16 bytes
-Typical programming time 6 ms(<10ms) for up
to 16 bytes
High reliability
-Endurance 10
-Data retention 40 years
6
cycles
1)
1)
-ESD protection 4000 V on all pins
8 pin DIP/DSO packages
Available for extended temperature ranges
-Industrial -40 to +85
-Automotive -40 to +125
3. Block Diagram
2
C-Bus
2. Pin Configuration
Fig. 6
Fig. 7
4. Refer to Table 4 about Functions and Data of the IC’s Each Pin
11
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SERVICE MANUAL
OM8839PS (N301)
I2C-bus Controlled PAL/NTSC/SECAM TV Processors
1. Features
The following features are available in all IC’s:
·Multi-standard vision IF circuit with an
alignment-free PLL demodulator without external
components
·Alignment-free multi-standard FM sound
demodulator (4.5 MHz to 6.5 MHz)
·Audio switch
·Flexible source selection with CVBS switch and
Y(CVBS)/C input so that a comb filter can be
applied
·Integrated chrominance trap circuit
·Integrated luminance delay line
·Asymmetrical peaking in the luminance channel
with a (defeatable) noise coring function
·Black stretching of non-standard CVBS or lumina-
nce signals
·Integrated chroma band-pass filter with switchable
centre frequency
·Dynamic skin tone control circuit
·Blue stretch circuit which offsets colours near
white towards blue
·RGB control circuit with “Continuous Cathode
Calibration” and white point adjustment
·Possibility to insert a“blue back” option when no
video signal is available
·Horizontal synchronization with two control loops
and alignment-free horizontal oscillator
·Vertical count-down circuit
·Vertical driver optimised for DC-coupled vertical
output stages
2
·I
C-bus control of various functions
2. General Description
The various versions of the TDA 884X/5X
series are I
2
processors which are intended to be applied in
PAL, NTSC, PAL/NTSC and multi-standard
television receivers. The N2 version is pin and
application compatible with the N1 version,
however, a new feature has been added which
makes the N2 more attractive. The IF PLL
demodulator has been replaced by an
alignment-free IF PLL demodulator with
internal VCO (no tuned circuit required). The
setting of the various frequencies (33.4, 33.9,
38, 38.9, 45.75 and 58.75 MHz) can be made
via the I
2
C-bus.
Because of this difference the N2 version is
compatible with the N1, however, N1 devices
cannot be used in an optimised N2 application.
Functionally the IC series is split up in 3
categories, viz:
·Versions intended to be used in economy TV
receivers with all basic functions (envelope:
S-DIP 56 and QFP 64)
·Versions with additional features like E-W
geometry control, H-V zoom function and
YUV interface which are intended for TV
receivers with 110° picture tubes (envelope:
S-DIP 56)
·Versions which have in addition a second
RGB input with saturation control and a
second CVBS output (envelope: QFP 64)
The various type numbers are given in the
table below.
C-bus controlled single chip TV
3. Survey of IC Types
EnvelopeS-DIP 56 QFP 64
TV receiver category EconomyMid/High end EconomyMid/High end
DC-coupled Vertical Deflection and East-West Output Circuit
1. Features
Few external components
Highly efficient fully DC-coupled vertical
output bridge circuit
Vertical flyback switch
Guard circuit
Protection against
- short-circuit of the output pins
- short-circuit of the output pins to Vp
High EMC immunity due to common mode
inputs
3. Block Diagram
Temperature (thermal) protection
East-West output stage with one single
conversion resistor.
2. General Description
The TDA8350Q is a power circuit for use in 90°
and 110° colour deflection systems for-field
frequencies of 50 to 120 Hz. The circuit
provides a DC driven vertical deflection output
circuit, operating as a highly efficient class G
system and an East-West driver for sinking the
diode modulator current.
Fig. 9 Block Diagram
4. Refer to Table 6 about Functions and Data of the IC’s Each Pin.
14
Page 17
SERVICE MANUAL
TDA7057AQ (N601)
2×8W Stereo BTL Audio Output Amplifier with DC Volume Control
1. Features
·DC volume control
·Few external components
·Mute mode
·Thermal protection
·Short-circuit proof
·No switch-on and switch-off clicks
·Good overall stability
·Low power consumption
·Low HF radiation
·ESD protected on all pins.
3. Block Diagram
2. General Description
The TDA7057AQ is a stereo BTL output amplifier with DC
volume control. The device is designed for use in TVs and
monitiors, but is also suitable for battery-fed portable
recorders and radios.
Missing Current Limiter (MCL)
A MCL protection circuit is built-in. The MCL circuit is
activated when the difference in current between the
output terminal of each amplifier exceeds 100 mA (typical
300 mA). This level of 100 mA allows for single-ended
headphone applications
Fig. 10 Block Diagram
4. Refer to Table 7 about Functions and Data of the IC’s Each Pin.
15
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SERVICE MANUAL
TDA6107Q (NY01)
Triple Video Output Amplifier
1. Features
·Typical bandwidth of 5.5 MHz for an
output signal of 60 V (p-p)
·High slew rate of 900 V/S
·No external components required
·Very simple application
·Single supply voltage of 200 V
·Internal reference voltage of 2.5 V
·Fixed gain of 50
·Black-Current Stabilization (BCS) circuit
·Thermal protection.
3. Ordering Information
2. General Description
The TDA6107Q includes three video output amplifiers
in one plastic DIL-bent-SIL 9-pin medium power
(DBS9MPF) package (SOT 111-1), using high-voltage
DMOS technology, and is intended to drive the three
cathodes of a colour CRT directly. To obtain maximum
performance, the amplifier should be used with
black-current control.
Type
Number
TDA6107QDBS9MPF
4. Block Diagram
NameDescriptionVersion
Package
Plastic DIL-bent-SIL medium power package with fin; 9
leads
SO T111-1
Fig. 11 Block Diagram (One Amplifier Shown)
5. Refer to Table 8 about Functions and Data of the IC’s Each Pin.
16
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SERVICE MANUAL
STR-G5653/6454R (NQ821)
Power Module
The Series STR-G5653/F6654 is specifically designed to satisfy the requirements for increased
integration and reliability in off-line quasi-resonant flyback converters. The series incorporates a
high-precise error amplifying control and drive circuit with discrete avalanche-rated power MOSFET,
featuring fewer external components, small-size and standard power supply.
Covering the power range from below 25 watts up to 300 watts for 100/115/230 VAC inputs, and up to
150 watts for 85 to 265 VAC universal input, these devices can be used in a range of applications,
from battery chargers and set top boxes, to televisions, monitors, and industrial power supply units.
Cycle-by-cycle current limiting, under-voltage lockout with hysteresis, over-voltage protection, and
thermal shutdown protects the power supply during the normal overload and fault conditions.
Low-current startup and a low-power standby mode selected from the secondary circuit completes a
comprehensive suite of features. The series is provided in a five-pin overmolded SIP style package,
affording dielectric isolation without compromising thermal characteristics.
1. Features
Flyback Operation with Quasi-Resonant Soft Switching for Low Power Dissipation and EMI
Rugged Avalanche-Rated MOSFET
Soft drive circuit MOSFET
Adjustable MOSFET switching speed
Choice of MOSFET Voltage and rDS(on)
Full Over-Current Protection (no blanking)
Under-Voltage Lockout with Hysteresis
Over-Voltage Protection
Direct Voltage Feedback
Low Start-up Current (100 Amax)
Low-Frequency, Low-Power Standby Operation
Overmolded 5-Pin Package
2. Circuit Block Diagram
Fig.12
17
Page 20
3. Pin Configuration and Functions
SERVICE MANUAL
Dwg MK-003-50mm
Fig.13
3.1) Pin function for STR-G5653
Pin No. SymbolFunction Description
1DMOSFET drain
2SMOSFET source
3GNDGround
4VINSupply voltage input for control circuit
5OCP/FBOver-current protection detection signal/voltage-limiting signal input
3.2) Pin function for STR-F6654
Pin No. SymbolFunction Description
1OCP/FBOver-current protection detection signal/voltage-limiting signal input
2SMOSFET source
3DMOSFET drain
4VINSupply voltage input for control circuit
5GNDGround
4. Difference between STR-G5653 and STR-F6654
a.Different size: STR- F6654 is larger
b.Different pin functions
c.Different electric characteristics: Larger power output, switching current, avalanche-rated and
internal allowable power consumption for STR-F6654
18
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SERVICE MANUAL
TDA9859 (N606)
Universal Hi-Fi Audio Processor for TV
1. Features
Multi-source selector switches six AF inputs
(three stereo sources or six mono sources).
Each of the input signals can be switched to
each of the outputs (crossbar switch).
Outputs for loudspeaker channel and peri-TV
connector (SCART).
Switchable spatial stereo and pseudo stereo
effects
3. Block Diagram
(1) For extended bass control, the capacitor between CBR/L1 and CBR/L2 should be replaced by the
Audio surround decoder can be added
externally
Two general purpose logic output ports
2
I
C-bus control of all functions.
2. General Description
The TDA9859 provides control facilities for the
main and the SCART channel of a TV set. Due
to extended switching possibilities signals
from three stereo sources can be handled.
Fig. 14 Block Diagram and Application Circuit.
extended bass control network.
4. Refer to Table 9 about Functions and Data of the IC’s Each Pin.
19
Page 22
SERVICE MANUAL
HEF4053 (DS01/DS02)
Triple 2-channel Analog
Multiplexer/Demultiplexer
1. Description
The HEF4053 is a triple 2-channel analog
multiplexer/demultiplexer with a common enable
input (E). Each multiplexer/demultiplexer has two
independent inputs/outputs (Y
common input/output (Z)and select inputs (Sn).
Each also contains two-bidirectional analog
switcheseach with one side connected to an
independent input/output (Y
other side connected to a common
input/output(Z).
With (E) LOWone of the two switches is
2. Block Diagrams
and Y1) a
0
and Y1) and the
0
selected (low impedance ON-state) by Sn. With
E HIGHall switches are in the high impedance
OFF-stateindependent of S
V
and VSSare the supply voltage connections
DD
for the digital control inputs (S
The V
inputs/outputs (Y
V
limit. V
to VSS range is 3 to 15V.The analog
DD
and Z) can swing between
0Y1
as a positive limit and VEE as a negative
DD
may not exceed 15 V.
DD-VEE
to SC.
A
to SC and E).
A
For operation as a digital multiplexer/demultiple-
xer V
is connected to VSS (typically ground).
EE
Fig. 15 Functional Diagram
20
Page 23
SERVICE MANUAL
Pinning
Y
to Y0C Independent inputs/outputs
0A
Y
to Y1C Independent inputs/outputs
1A
S
to S
A
c
EEnable input (active LOW)
to Z
Z
A
C
Select inputs
Common inputs/outputs
Fig. 16 Pinning Diagram
HEF4053P(N): 16-lead DIL ; plastic
(SOT38-1)
HEF4053D(F): 16-lead DIL; ceramic
(cerdip)
(SOT74)
HEF4053T(D): 16-lead S0; plastic
(SOT109-1)
( ): Package Designator North America
3. Function Table
Inputs Channel
E Sn On
L LY
L HY
on-Zn
ln-Zn
H X none
Notes
H=HIGH state (the more positive voltage)
L=LOW state (the less positive voltage)
X=STATE is immaterial
Fig. 17 Schematic Diagram (One Switch)
Ratings
Limiting values in accordance with the Absolute Maximum System(IEC 134)
Supply voltage (with reference to V
)V
DD
-18 to + 0,5 V
EE
Note
To avoid drawing V
current out of terminal Z, when switch current flows into terminals Y, the voltage
DD
drop across the bidirecctional switch must not exceed 0,4 V. If the switch current flows into terminal Z,
no V
current will flow out of terminals Y, in this case there is no limit for the voltage drop across the
DD
switch, but the voltages at Y and Z may not exceed V
DD
or V
EE
4. Refer to Table 10 about Functions and Data of the IC’s Each Pin.
21
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SERVICE MANUAL
Service Data of Key ICs
Table 3 Functions and Service Data of LC86F3264AU-DIP (N001)’s Pins
Pin
No.
1Not connected09.625.35
2Clock line4.899.565.08
3Data line4.879.565.06
4AV1 control56.845.22
5AV2 control06.895.16
6AV3 control07.285.29
7Not connected09.615.4
8Not connected0.929.65.4
9Ground000
10Input terminal for clock oscillating signal 1.889.556.12
11Output terminal for clock oscillating signal 2.639.056.08
12Power supply53.643.33
13Button-control voltage input terminal 58.915.21
14Button-control voltage input terminal 58.935.21
15Not connected59.455.45
16Not connected4.99.535.45
17Reset4.964.644.48
18Filter2.769.525.31
19Video signal input terminal 39.515.92
20Input terminal for vertical flyback pulse 4.748.735.03
21Input terminal for horizontal flyback pulse 4.278.815.01
22R character output terminal 02.082.08
23G character output terminal 02.12.1
24B character output terminal 02.082.08
25Output terminal for fast blanking signal 01.971.97
26Character level clamping 09.545.73
27Clock line 0 57.124.91
28Data line 0 57.125.18
29Clock line 1 4.527.055.12
30Data line 114.417.035.09
31Overload detecting input terminal 56.955.13
32Input terminal for selectable production modes 59.625.29
33Not connected09.565.46
34Remote control input 4.649.225.33
35Not connected09.585.4
36Not connected09.585.42
37Mute09.584.3
38Not connected09.585.36
39Not connected09.595.28
40Not connected09.595.36
41Standby control07.434.9
42Not connected09.65.36
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive
Resistance (K )
Negative
Resistance (K )
22
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SERVICE MANUAL
Table 4 Functions and Service Data of AT24C04 (N002)'s Pins
Pin
No.
1Address input000
2Address input000
3Address input000
4Common ground000
5Clock line57.054.82
6Data line57.065.24
7Write protect4.999.585.49
8Power supply53.643.33
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive
Resistance (K )
Negative
Resistance (K )
Table 5 Functions and Service Data of OM8839PS (N301)’s Pins
Pin
No.
1SIF signal input 02.212.21
2External audio signal input 3.659.026.04
3Reference frequency resonant coil terminal 0
4Reference frequency resonant coil terminal 0
5PLL filter2.518.925.82
6Video detection output3.062.22.2
7Clock line4.47.155.15
8Two-way transmission data line 4.527.155.15
9Gap decoupling6.77.525.68
10SVHS chroma signal input 1.3596
11SVHS luminance signal input 3.49.045.91
12Supply voltage8.242.781.96
13Composite video signal input terminal 4.329.155.94
14Ground000
15Audio signal output 39.245.98
16Decoupling capacitor connection 0
17Video input3.49.125.94
18Black current control input 5.819.225.88
19Blue(B) signal output3.046.195.2
20Green(G) signal output3.16.195.23
21Red(R) signal output3.26.25.26
22Beam current control2.18.226.04
23Red(R) signal output3.69.016.12
24Green(G) signal output3.619.016.12
25Blue(B) signal output3.69.016.12
26Selectable primary color signal input control 0.111
27Luminance signal input3.269.255.87
28Luminance signal input3.269.255.87
29B-Y color difference signal output 2.388.55.91
30R-Y color difference signal output 2.378.55.91
31B-Y color difference signal output 2.388.55.91
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive
Resistance (K )
Negative
Resistance (K )
23
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SERVICE MANUAL
32R-Y color difference signal output 2.378.55.91
33Sub-carrier output for SECAM demodulation 0.356.785.96
343.58MHz crystal oscillator2.548.026.04
354.43MHz crystal oscillator2.538.026.04
36APC low pass filter 4.999.376
37Horizontal starting supply voltage8.222.642.56
38Composite video output3.687.526.11
39Black level stretch 4.959.264.93
40Line drive pulse output3.553.53.49
Horizontal flyback pulse input/sandcastle pulse
41
output
42Line discriminator3.668.816.04
43Line discriminator3.929.316.04
44Ground000
45Vertical frequency parabola output 0.739.055.97
46Field drive signal output2.329.35.97
47Field drive signal output2.359.35.97
48IF signal input 4.628.526.2
49IF signal input 4.628.526.2
50High voltage detection input2.058.046.14
51Vertical sawtooth generation3.88.656.09
52Vertical reference bias setting 3.98.896.05
53AGC filter for IF amplifier4.499.256
54AGC output for IF amplifier0.6710.055.82
55Audio deemphasis2.938.936.12
56Audio decoupling4.029.376.08
0.768.825.92
Table 6 Functions and Service Data of TDA8350 (N401)’s Pins
Pin
No.
1Vertical drive input (positive)2.329.45.84
2Vertical drive input (negative)2.39.45.87
3Feedback input8.155.814.72
4Supply voltage16.277.997.62
5Output 18.145.884.72
6Not connected0
7Ground000
8Pump supply voltage input 46.944.29
9Output 18.225.924.71
10Guard output0.288.515.899
11Pincushion output16.999.454.16
12Pincushion input (negative)0.259.125.93
13Pincushion input (positive) 000
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive
Resistance (K )
Negative
Resistance (K )
24
Page 27
SERVICE MANUAL
Table 7 Functions and Service Data of TDA7057AQ (N601)’s Pins
Pin
No.
1Volume control input1.036.886.15
2Not connected0
3Audio R signal input 2.4512.686.5
4Supply voltage16.180.460.46
5Audio L signal input 2.4512.66.5
6Ground000
7Volume control input1.036.886.15
8Left channel in-phase signal output 7.646.485.6
9Ground000
10Left channel inverting signal output 7.716.475.6
11Right channel inverting signal output 7.766.475.6
12Ground000
13Right channel in-phase signal output 7.796.485.6
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive
Resistance (K )
Negative
Resistance (K )
Table 8 Functions and Service Data of TDA6107Q (NY01)’s Pins
Pin
No.
1G inverting input 2.945.724.96
2R inverting input 35.724.96
3B inverting input 2.915.724.96
4Ground000
5Black level current input 6.519.285.68
6Supply voltage198.654.53
7B output1035.48
8R output98.65.48
9G output100.65.48
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive
Resistance (K )
Negative
Resistance (K )
25
Page 28
SERVICE MANUAL
Table 9 Functions and Service Data of TDA9859 (N606)’s Pins
Pin
No.
Function Description
Reference Voltage (V)
Digital Multimeter
Positive Resistance
(K )
Negative
Resistance (K )
1Audio input4.147.625.85
2Output 107.866.26
3Audio input4.147.615.84
4Reference voltage for filtering
capacitor
8.187.465.94
5Audio output4.147.625.83
6Supply voltage8.261.621.62
7Audio output4.157.415.95
8Ground000
9Audio output4.157.365.79
10Audio input 8 4.157.365.79
11Channel 1 audio compensation 4.157.386.12
12Channel 2 audio compensation 4.157.616.03
13Audio output 8 0
14Treble compensation4.157.486.24
15Audio output4.136.785.66
16Clock line4.337.025.25
17Serial data line 4.536.985.21
18Audio output4.136.785.65
19Treble compensation4.147.486.24
20Audio output0
21Bass2 compensation4.157.596.04
22Bass1 compensation4.157.376.12
23Audio input4.157.345.77
24Audio output4.157.345.77
25Mode address selection 000
26Audio output4.157.385.96
27Audio compensation 1 4.147.646.22
28Audio input4.147.595.83
29Audio compensation 1 4.147.616.24
30Audio input4.147.575.83
31Output 207.846.24
32Audio input4.147.575.83
26
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SERVICE MANUAL
Table 10 Functions and Service Data of HEF4053 (DS01/DS02)’s Pins
Pin
No.
1Signal input09.816.15
2Signal input000
3Signal input09.816.15
4Signal output06.666.21
5Signal input000
6Ground000
7Ground000
8Ground000
9Control signal input 0.127.975.7
10Control signal input 0.127.995.7
11Control signal input 4.987.85.6
12Signal input000
13Signal output09.816.15
14Signal input06.96.4
Signal output
1506.956.4
16Supply voltage5.096.984.44
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive Resistance
(K )
Negative
Resistance (K )
Table 11 Functions and Service Data of TDQ-6F2M’s Pins
Pin
No.
1AGC0.989.566.04
2NC26.736.85
3NC0.619.797.39
4SCL4.899.585.13
5SDA4.889.585.12
6VDD52.22.2
7NC4.92.22.2
8NC000
9BT30.2113.07
10NC000
11IF0
Function Description
Reference
Voltage (V)
Digital Multimeter
Positive Resistance
(K )
Negative
Resistance (K )
27
Page 30
Waveforms of Key Points
SERVICE MANUAL
IC DATAAND WAVEFORMS OF KEY POINTS (continued)
28
Page 31
SERVICE MANUAL
29
Page 32
SERVICE MANUAL
30
Page 33
SERVICE MANUAL
31
Page 34
SERVICE MANUAL
ADJUSTMENTS
Set-up Adjustments
The following adjustments should be made when a complete realignment is required or a new CRT is
installed. Perform the adjustments in order as follows.
1. Colour purity
2. Convergence
3. White Balance
Note:
The purity/convergence magnet assembly and rubber wedges need mechanical positioning. Refer to
Fig. 18.
1. Colour Purity Adjustment
Note:
Before attempting any purity adjustment, the TV should be operated for at least 15 minutes.
1) Demagnetize the CRT and cabinet using a degaussing coil.
2) Set the brightness and contrast to maximum.
3) Receive the green raster test pattern.
4) Loosen the clamp screw holding the deflection yoke and slide it backward or forward to display
vertical green belt (zone) on the screen.
5) Remove the rubber wedge.
6) Rotate and spread the tabs of the purity magnet around the neck of the CRT until the green belt is on
the center of the screen.
7) Slowly move the deflection yoke forward or backward until a uniform green screen is obtained.
Tighten the clamp screw of the yoke temporarily.
8) Check purity of the red and blue raster.
Deflection Yoke
Dummy Wedge
Glass Cloth Tapes
Purity/Convergence
Magnet Module
Rubber Wedge
Adhesive
Deflection Yoke
Fig. 18
32
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SERVICE MANUAL
Fig. 19
2. Convergence Adjustment
Note:
Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.
Center convergence adjustment
1) Receive the crosshatch test pattern.
2) Set the brightness and contrast properly.
3) Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical
lines are superimposed on the center area of the screen.
4) Turn both tabs at the same time keeping the angle constant to superimpose red and blue horizontal
lines on the center of the screen.
5) Adjust two tabs of 6-pole magnet to superimpose red/blue line and green line. Adjusting the angle
affects the vertical lines and rotating both magnets affects the horizontal lines.
6) Repeat steps 3) 5) keeping in mind red, green and blue movement. 4-pole magnet and 6-pole
magnet interact each other, resulting in complicating and dot movement.
Circumference convergence adjustment
1) Loosen the clamping screw of the defection yoke slightly to allow it to tilt.
2) Temporarily put a wedge as shown in Fig.18. (Do not remove cover paper on adhesive part of the
wedge.)
3) Tilt front of the deflection yoke up or down to obtain better convergence in circumference.
Push the mounted wedge into the space between the CRT and yoke to fix the yoke temporarily.
4) Put other wedge into bottom space and remove the cover paper to stick.
5) Tilt front of the deflection yoke right or left to obtain better convergence in circumference.
6) Keep the deflection yoke position and put another wedge in either upper space. Remove cover paper
and stick the wedge on the CRT to fix the yoke.
7) Detach the temporarily mounted wedge and put it in another upper space. Stick it on the CRT to fix
the yoke.
8) After fixing three wedges, recheck overall convergence.
Tighten the screw firmly to fix the yoke and check if the yoke is fixed.
33
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SERVICE MANUAL
9) Stick three adhesive tapes on wedges as shown in Fig. 18.
Fig. 20
Circuit Adjustments
1. General Description
All adjustments are thoroughly checked and corrected before the TV outgoing. Therefore the TV
should operate normally and deliver proper colour pictures upon installation. However, several
minor adjustments may be required depending on the particular location where the TV is operated.
This TV is shipped completely in carton. Carefully take out the TV from the carton and remove all
packing materials. Connect the power cord into a 120V AC, 60Hz two-pin power outlet. Turn on the
TV. Check and adjust all the customer controls such as brightness, contrast and colour to obtain
natural colour pictures.
2. Automatic Degaussing
A degaussing coil is mounted around the CRT so that external degaussing after moving the TV is
generally unnecessary, providing it is properly degaussed upon installation. The degaussing coil
operates in about 1 second after power on. If the set is moved or faced to a different direction, the
power switch must be switched off for a few minutes in order that the automatic degaussing circuit
operates properly. Should the chassis or parts of the cabinet become magnetized to cause poor
colour purity, use an external-degaussing coil. Slowly move the degaussing coil around the screen,
the sides and front of the TV and slowly withdraw the coil to a distance of about 2m before unplug it.
If colour shading still exists, perform the Colour Purity Adjustment and Convergence Adjustment
procedures.
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3. Supply Voltage Adjustment
Caution: +B voltage has close relation to high voltage. To avoid X-ray radiation, +B voltage should be
+145V.
1) Set R801 to the mechanical center and AC power supply to 120±2V.
2) Connect a digital voltmeter to two pins of C838, and then turn on the TV.
3) Receive Philips test pattern signals.
4) Make the voltmeter read 145±0.5V.
4.High Voltage Inspection
Caution: No high voltage adjustment should be done in the chassis.
1) Connect a precise high voltmeter to the second anode of the CRT.
2) Turn on the TV and set the brightness and contrast to minimum (i.e. set beam current of the CRT
to zero).
3) The high voltage tested should be 29±0.5KV(for 25” TV) or 30±0.5KV(for 29” TV)
4) Set the brightness to minimum or maximum, and ensure high voltage not beyond limitation of
30KV (For 25” TV) or 33KV (For 29” TV) in any case.
5. Focus Adjustment
1) Use the remote control to set the contrast to maximum and the brightness, chroma to medium.
2) Set H. V. lines near Philips pattern center to thinnest with the FCB on the FBT. After finishing
adjustment, ensure that no poor focusing exists near the center or around of the frame.
BeforeAdjusting AfterAdjusting
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SERVICE MANUAL
Service Mode and Bus Data
1. How to Enter the SERVICE Mode with the Remote control.
Decrease the volume to 00. Press the MUTE button on the remote control and “Mute”appears on the
TV screen. Then press and hold the MUTE button on the remote control and MENU on the TV at the
same time for 3 seconds and the TV enters the S mode.
Press the orbutton to select data in turn and or button to decrease or increase data. Press
the button on the remote control or MAIN POWER SWITCH button on the TV to exit from the mode.