Apex at2408s schematic

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SERVICE MANUAL

FILE NO. SM-CTV-O-044

COLOR TELEVISION

SERVICE MANUAL

MODEL NO. CHASSIS NO. CH-10C1(S)

AT2408S/AT2408

Please read this manual carefully before service

PRINTED IN CHINA.MAY.2003 ©

SERVICE MANUAL

CONTENTS

SAFETY INSTRUCTIONS...........................................................................................1

SPECIFICATIONS .......................................................................................................2

KDEY ICS AND ASSEMBLIES....................................................................................3

SYSTEM BLOCK DIAGRAMS.....................................................................................4

IC DATA AND WAVEFORMS OF KEY POINTS ..........................................................5

CIRCUIT ADJUSTMENTS...........................................................................................5

SET-UP ADJUSTMENTS ............................................................................................5

SERVICE MODE AND BUS DATA ..............................................................................5

TROUBLESHOOTING FLOW CHARTS......................................................................7

SERVICE SPARE PARTS LIST.................................................................................13

APPENDIX

1. CIRCUIT DIAGRAM

2. FINAL WIRING DIAGRAM

3. FINAL ASSEMBLY DIAGRAM

4. PRINTED CIRCUIT BOARD DIAGRAMS

SERVICE MANUAL

SAFETY INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY

RADIATION PRECAUTION”, “SAFETY PRECAUTION” AND “PRODUCT

SAFETY NOTICE” INSTRUCTION BELOW.

X-RAY RADIATION PRECAUTION

1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray

radiation as result of excessive EHT voltage. The nominal EHT for this TV is 27.5KV at zero beam

current (minimum brightness) operating at AC 120V. The maximum EHT voltage permissible in any

operating circumstances must not exceed 30KV. When checking the EHT, use the High Voltage

Check procedure in this manual using an accurate EHT voltmeter.

2. The only source of X-RAY in this TV is the CRT. To prevent X-ray radiation, the replacement CRT

must be identical to the original fitted as specified in the parts list.

3. Some components used in this TV have safety related characteristics preventing the CRT from

emitting X-ray radiation. For continued safety, replacement component should be made after

referring the PRODUCT SAFETY NOTICE below.

SAFETY PRECAUTION

1. The TV has a nominal working EHT voltage of 27.5KV. Extreme caution should be exercised when

working on the TV with the back removed.

1) Do not attempt to service this TV if you are not conversant with the precautions and procedures for

working on high voltage equipment.

2) When handling or working on the CRT, always discharge the anode to the TV chassis before

removing the anode cap in case of electric shock.

3) The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take extreme

care while handling.

4) Do not hold the CRT by the neck as this is a very dangerous practice.

2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly as

supplied from factory.

3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable

isolating transformer of beyond rated overall power when servicing or connecting any test

equipment for the sake of safety.

4. Replace blown fuses within the TV with the fuse specified in the parts list.

5. When replacing wires or components to terminals or tags, wind the leads around the terminal before

soldering. When replacing safety components identified by the international hazard symbols in the

circuit diagram and parts list, it must be the company-approved type and must be mounted as the

original.

6. Keep wires away from high temperature components.

SERVICE MANUAL

SAFETY INSTRUCTIONS (continued)

PRODUCT SAFETY NOTICE

Many electrical and mechanical components in this chassis have special safety-related characteristics.

These characteristics are often passed unnoticed by a visual inspection and the X-ray radiation

protection afforded by them cannot necessarily be obtained by using replacements rated at higher

voltages or wattage, etc. Components which have these special safety characteristics in this manual

and its supplements are identified by the international hazard symbols in the circuit diagram and parts

list. Before replacing any of these components read the parts list in this manual carefully. Substitute

replacement components which do not have the same safety characteristics as specified in the parts

list may create X-ray radiation.

PRECAUTIONS

Power Sources-The TV set should be operated only from the type of power source indicated on the TV set or as indicated in the Service Manual. If you are not sure of the type of powe supply in your home, consult your sales person or your local power company. For TV sets designed to operate from battery power, or othe sources, refer to the operating instructions.

Grounding or Polarization-Do not defeat the safety purpose of the polarized o grounding-type plug. A polarized plug has two blades with one wider than the other. grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

Wide blade Lame large Cuchilla ancha

Alternate Warnings-A three wire grounding type plug-a plug having a third (grounding) pin. This plug will only fit into grounding type powe outlet.

Water and Moisture Warnings-Do not use the TV set near water-for example, near a bath tub, wash bowl, kitchen sink, or laundry tub; in a wet basement; or near a swimming pool; and the like.The TV set shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall be placed on the TV set.

Ventilation-Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the TV set and to protect it from overheating, and these openings must not be blocked or covered. The openings should neve be blocked by placing the TV set on a bed, sofa, rug, or other similar surface. This TV set should not be placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturer have been adhered to.

s instructions

SERVICE MANUAL

SPECIFICATIONS

Television system:

Channel coverage:

Channels preset:

Antenna input:

Picture tube;

Max. audio output;

Power source;

Weight:

Dimensions(W/H/D):

Packing dimensions(W/H/D):

Rated power consumption:

NTSC-M

VHF 2

UHF 14

CABLE TV: MID BAND (A-8

A-1, A I)

SUPER BAND (J

HYPER BAND (AA

ULTRA BAND (65

181

(unbalanced)

Effective screen dimensions: 478mm×363mm (18.82×14.29 in.)

5W×2 (for AT2408 only); 5W+5W (for AT2408S only)

120Vac 60Hz

31.5kg (69 lbs) (Approx.)

660×522×458mm (25.98×20.55×18.03 in.) (Approx.)

740×610×545mm (29.13×24.02×21.46 in.) (Approx.)

125W

Designs and specifications are subject to change without notice.

KEY ICS AND ASSEMBLIES

ZZ, AAA, BBB)

94, 100 125)

Table 1 Key ICs and Assemblies

Serial No. Position No. Model No. Function Description

1 N301 OM8839PS/TDA8843-N2 Small signal processor

2 N401 TDA8350Q Vertical output circuit

3 N402 LM317 Tri-terminal regulator

4 N601 TDA7057AQ Sound power amplifier

5 N001 CH04T1002/CH04T1009 Microcontroller

6 N002 AT24C04 EEPROM

7 N811 TDA4605 Switching power control circuit

8 NY01 TDA6107Q Video amplifier

9 DS01 HEF4052 Analog switch circuit

10 DS02 HEF4053 Analog switch circuit

11 N606 TDA9859 Audio processor

12 U101 TDQ-6F2M2 Tuner

Note: TDA9859 (N606) is not available in AT2408.

SERVICE MANUAL

SYSTEM BLOCK DIAGRAMS

Fig.1 Block Diagram for CH-10C1(S) Remote Control Structur

SERVICE MANUAL

SYSTEM BLOCK DIAGRAMS

(continued)

Fig. 2 Structure Block Diagram for CH-10C1(S) Chassis

SERVICE MANUAL

SYSTEM BLOCK DIAGRAMS

Fig. 3 Block Diagram for CH-10C1(S) Supply Voltage System

(continued)

SERVICE MANUAL

SYSTEM BLOCK DIAGRAMS

(continued)

Fig. 4 Block Diagram for CH-10C1(S) Video Signal Processor

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

TDA 4605

Control IC for Switched-Mode Power Supplies Using MOS-Transistor

1. Features

Fold-back characterisitics provides overload protection for external

components

Burst operation under secondary short-circuit condition implemented

Protection against open or a short of the control loop

Switch-off if line voltage is too low (undervoltage switch-off)

Line voltage depending compensation of fold-back point

Soft-start for quiet start-up without noise generated by the transformer

Chip-over temperature protection implemented(thermal shutdown)

On-chip ringing suppression circuit against parasitic oscillations of the

transformer

AGC-voltage reduction at low load

2. Block Diagram

Fig. 11

3. Refer to Table 3 about Functions and Data of the IC’s Each Pin.

Fig. 10

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

CH04T1002/ CH04T1009

1. Terminal Assignment Layouts

Fig. 12 CH04T1002/ CH04T1009 DIP42S Terminal Assignment Layoutd

Fig. 13 CH04T1002/ CH04T1009 QIP48E Terminal Assignment Layout

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

CH04T1002/ CH04T1009 (continued)

2. Terminal Function

Table 2 Terminal Function Table

Terminal I/O Function Description Option Format

VSS - Negative power supply

XT1 1 Input terminal for crystal oscillation

XT2 O Output terminal for crystal oscillation

VDD - Positive power supply

RES I Reset terminal A

FILT O Charge-pump ouput terminal N

CVIN I

VS I

HS I

R O

G O

B O Blue (B) output terminal of RGB imagee

I O Intensity (I) output terminal of RGB image

BL O

Part 0

P00-p07

Port 1

P10-P17

Port 6

Image signal input terminal (available only in CH04T1002) Vertical synchronization signal input terminal

Horizontal synchronization signal input terminal

Red (R) output terminal of RGB image

Green (G) output terminal of RGB image

Fast blanking control signal Switch TV image and caption/OSD image signal

8-bit input/output port Input/output can be specified in nibble unit

I/O

Other functions: Hold release input Internal input

8-bit input/output port Each bit can be independently programmable Other functions:

P10 SIO0 data output P11 SIO0 data input/bus input/output P12 SIO0 clock input/output P13 PWM1 output P14 PWM2 output P15 PWM3 output P17 Timer 1(PWM) output

4-bit input/output port Each bit can be independently programmable Other functions:

P60 IIC0 data input/output P61 IIC0 clock output P62 IIC1 data input/output P63 IIC1 clock output

Pull-up resistor provided/not provided

Output format

CMOS/Nch-OD

Output format

CMOS/Nch-OD

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

(continued)

CH04T1002/CH04T1009 (continued)

Terminal I/O Function Description Option Format

P70

P71-P73

Port 7

P71-P73

I/O

4-bit input/output port

Each bit can be independently

programmable

Other functions:

P70

P71 INT1 input/HOLD release input P72 INT2 input/timer 0 event input

P73

Interrupt receiver format vector address

INTO

INT1

INT2

INT3

INTO input/HOLD release input /Nch-Tr. output for watchdog timer

INT3 input (noise rejection filter attached input)/timer 0 event input

Rising Falling

yes

Rising/ Falling

yes

H level L level Vector

yes

03H

0BH

13H

1BH

Port 8

P83

P84-P87

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)

4-bit input/output port(P84-P87)

Each bit can be independently

programmable

Other function:

AD converter input port

P83

P84-P87

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

EEPROM AT24C04

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 I2C-Bus

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

-ESD protection 4000 V on all pins 8 pin DIP/DSO packages Available for extended temperature ranges

-Industrial

-Automotive

3. Block Diagram

cycles1)

-40 to +85

-40 to +125

2. Pin Configuration

4. Refer to Table 5 about Functions and

Data of the IC’s Each Pin

(continued)

Fig. 14

Fig. 15

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

OM8839PS/TDA8843-N2

I2C-bus Controlled PAL/NTSC/SECAM TV Processors

1. Features

The following features are available in all IC

·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

C-bus control of various functions

·I

2. General Description

The various versions of the TDA 884X/5X series are I2C-bus controlled single chip TV 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 inter-nal 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 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.

(continued)

C-bus.

3. Survey of IC Types

Envelope S-DIP 56 QFP 64

TV receiver category Economy Mid/High end Economy Mid/High end

PAL only TDA 8840 TDA 8840H

PAL/NTSC TDA 8841 TDA 8843 TDA 8841H

PAL/SECAM/NTSC TDA 8842 TDA 8844 TDA 8842H TDA 8854H

NTSC only TDA 8846/46A TDA 8847 TDA 8857H

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

OM8839PS/TDA8843-N2 (continued)

4. Block Diagram

(continued)

Fig .16 Block Diagram “Economy Versions” (S-DIP 56 Envelope)

5. Refer to Table 6 about Functions and Data of the IC’s Each Pin.

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

TDA8350Q

DC-coupled Vertical Deflection and East-West

Output Circuit

1. Features

Few extemal 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

3.Block Diagram

High EMC immunity due to common mode

inputs

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.

(continued)

Fig. 17 Block Diagram

4. Refer to Table 7 about Functions and Data of the IC’s Each Pin.

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

(continued)

TDA7057AQ

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

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.

issing 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. 18 Block Diagram

4. Refer to Table 8 about Functions and Data of the IC’s Each Pin.

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

TDA6107Q

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

Type

Number

TDA6107Q DBS9MPF

Name Description Version

Plastic DIL-bent-SIL medium power package with fin; 9 leads

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.

Package

(continued)

SOT 111 - 1

4. Block Diagram

Fig. 19 Block Diagram (One Amplifier Shown)

5. Refer to Table 9 about Functions and Data of the IC’s Each Pin.

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

HEF4052

Dual 4-channel Analog Multiplexer/Demultiplexer

1. Description

The HEF4052 is a dual 4-channel analog multiplexer/demultiplexer with common channel select logic. Each multiplexer/demultiplexer has four independent inputs/outputs (Y input/output (Z). The common channel select logic includes two address inputs (A

to Y3) and a common

and A1) and an active LOW enable input (E). Both multiplexers/demultiplexers contain four bidirectional analog switches, each with one side connected to an independent input/output (Y

to Y3) and the other side connected to a

common input/output(Z).

2. Block Diagrams

Fig. 20 Functional Diagram

With (low impedance ON-state) by A HIGH, all switches are in the high impedance OFF-state, independent of A0 and A1. VDD and Vss are the supply voltage connections for the digital control inputs (A0, A1 and E). The VDD to Vss range is 3 to 15 V. The analog inputs/outputs (Y Y3, and Z) can swing between VDD as a positive limit and VEE as a negative limit. V For operation as a digital multiplexer/ demultiplexer, VEE is connected to VSS (typically ground).

LOW, one of the four switches is selected

may not exceed 15 V.

DD-VEE

Pinning

to Y3A Independent inputs/outputs

to Y3B Independent inputs/outputs

A1 Address inputs

Enable input (active LOW)

ZB Common inputs/outputs

Family data,

lDD LIMITS category MSI

See Family Specifications

HEF4052P (N): 16-lead DIL; plastic

(SOT38-1)

HEF4052D (F) 16-lead DIL; ceramic

(cerdip)

(SOT74)

HEF4052T (D): 16-lead SO; plastic

(SOT109-1) (): Package Designator North America

(continued)

and A1. With E

Fig. 21 Pinning Diagram

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

(continued)

HEF4052 (continued)

Fig. 22 Schematic Diagram (One Switch)

3. Function Table

Inputs Channel

L L L Y

L L H Y

L H L Y

L H H Y

H X X none

Notes

H=HIGH state (the more positive voltage)

L=LOW state (the less positive voltage)

X=state is immaterial

Ratings

Limiting values in accordance with the Absolute Maximum System (IEC 134)

Supply voltage (with reference to V

Note

To avoid drawing V

drop across the bidirectional switch must not exceed 0,4V. If the switch current flows into terminal Z,

no V

but the voltages at Y and Z may not exceed V

4. Refer to Table 10 about Functions and Data of the IC

A1 A0 On

; YOB-ZB

OA-ZA

; Y1B-ZB

1A-ZA

; Y2B-ZB

2A-ZA

; Y3B-ZB

3A-ZA

) VEE -18 to +0,5 V

current out of terminal Z, when switch current flows into terminals Y, the voltage

current will flow out of terminals Y, in this case is no limit for the voltage drop across the switch,

or VEE

s Each Pin.

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

HEF4053

Triple 2-channel Analog

Multiplexer/Demultiplexer

1. Description

The HEF4053 is a triple 2-channel analog

multiplexer/demultiplexer with a common enable

input (

). Each multiplexer/demultiplexer has

two indepen-

dent inputs/outputs (Y

and Y1), a common

input/output (Z), and select inputs (Sn). Each

also contains two-bidirectional analog switches,

each with one side connected to an independent

input/output (Y

and Y1) and the other side

connected to a common input/output (Z).

With (

d to V

) LOW, one of the two switches is

(typically ground)

2. Block Diagrams

Fig.23 Functional Diagram

selected

(low impedance ON-state) by Sn. With

HIGH, all switches are in the high impedance

OFF-state, independent of S

and VSS are the supply voltage connections

for the digital control inputs (S

The V

inputs/outputs (Y

to VSS range is 3 to 15V.The analog

as a positive limit and VEE as a negative limit.

may not exceed 15 V.

DD-VEE

For operation as a digital

multiplexer/demultiplexer, V

(continued)

to SC.

to SC and E).

, Y1 and Z) can swing between

is connecte

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

HEF4053

HEF4053P(N): 16-lead DIL; plastic

HEF4053D(F): 16-lead DIL; ceramic

HEF4053T(D): 16-lead S0; plastic

( ): Package Designator North America

(continued)

Fig. 20 Pinning Diagram

(SOT38-1)

(cerdip)

(SOT74)

(SOT109-1)

Pinning

to Y0C

1A to Y1C

Independent inputs/outputs

to Sc Select inputs

Independent inputs/outputs

E Enable input (active LOW)

to ZC Common inputs/outputs

3. Function Table

Inputs Channel

E Sn On

L L Y

L H Y1n-Zn

X none

Notes

H=HIGH state (the more positive voltage)

L=LOW state (the less positive voltage)

X=STATE is immaterial

n-Zn

Fig. 25 Schematic Diagram (One Switch)

Ratings

Limiting values in accordance with the Absolute Maximum System (IEC 134)

Supply voltage (with reference to V

) VEE -18 to + 0,5 V

Note

To avoid drawing V

current out of terminal Z, when switch current flows into terminals Y, the voltage

drop across the bidirecctional switch must not exceed 0, 4 V. If the switch current flows into terminal

Z, no V

the switch, but the voltages at Y and Z may not exceed V

4. Refer to Table 11 about Functions and Data of the IC

current will flow out of terminals Y, in this case there is no limit for the voltage drop across

or V

EE.

s Each Pin.

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

Table 3 Functions and Service Data of TDA4605 (N811)’s Pins

Pin No. Function Description

1 Regulation control 0.4 0.713 0.4

2 Primary current input 1.34 9.71 1.34

3 Primary voltage monitoring input 1.91 7.09 1.91

4 Groundy 0 0 0

5 Drive pulse output 4.08 0.84 4.08

6 Supply voltage 0.74 16.35 4.9

7 Soft-start 2.36 8.69 6.19

8 Zero crossing input detection 0.33 6.72 5.94

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

Table 4 Functions and Service Data of CH04T1009 (N001)’s Pins

. Function Description

Pin No

1 Not connected 0 9.62 5.35

2 Clock line 4.89 9.56 5.08

3 Data line 4.87 9.56 5.06

4 AV1 control 5 6.84 5.22

5 AV2 control 0 6.89 5.16

6 AV3 control 0 7.28 5.29

7 Not connected 0 9.61 5.4

8 Not connected 0.92 9.6 5.4

9 Ground 0 0 0

10 Input terminal for clock oscillating signal 1.88 9.55 6.12

11 Output termin

12 Power supply 5 3.64 3.33

13 Button-control voltage input terminal 5 8.91 5.21

14 Button-control voltage input terminal 5 8.93 5.21

15 Not connected 5 9.45 5.45

16 Not connected 4.9 9.53 5.45

17 Reset 4.96 4.64 4.48

18 Filter 2.76 9.52 5.31

19 Video signal input terminal 3 9.51 5.92

20 Input terminal for vertical flyback pulse 4.74 8.73 5.03

21 Input terminal for horizontal flyback pulse 4.27 8.81 5.01

22 R character output terminal 0 2.08 2.08

23 G character output terminal 0 2.1 2.1

24 B character output terminal 0 2.08 2.08

25 Output terminal for fast blanking signal 0 1.97 1.97

26 Character level clamping 0 9.54 5.73

27 Clock line 0 5 7.12 4.91

28 Data line0 5 7.12 5.18

29 Clock line 1 4.52 7.05 5.12

al for clock oscillating signal

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

2.63 9.05 6.08

Digital Multimeter

(continued)

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

30 Data line 1 4.41 7.03 5.09

31 Overload detecting input terminal 5 6.95 5.13

Input terminal for selectable production

modes

33 Not connected 0 9.56 5.46

34 Remote control input 4.64 9.22 5.33

35 Not connected 0 9.58 5.4

36 Not connected 0 9.58 5.42

37 Mute 0 9.58 4.3

38 Not connected 0 9.58 5.36

39 Not connected 0 9.59 5.28

40 Not connected 0 9.59 5.36

41 Standby control 0 7.43 4.9

42 Not connected 0 9.6 5.36

5 9.62 5.29

Table 5 Functions and Service Data of AT24C04 (N002)’s Pins

Pin No. Function Description

1 Address input 0 0 0

2 Address input 0 0 0

3 Address input 0 0 0

4 Common ground 0 0 0

5 Clock line 5 7.05 4.82

6 Data line 5 7.06 5.24

7 Write protect 4.99 9.58 5.49

8 Power supply 5 3.64 3.33

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

Table 6 Functions and Service Data of OM8839PS (N301)’s Pins

Pin No. Function Description

1 SIF signal input 0 2.21 2.21

External audio signal input

Reference frequency resonant coil terminal

PLL filter

Video detection output

Clock line

Two-way transmission data line

Gap decoupling

SVHS chroma signal input

SVHS luminance signal input

Supply voltage

Composite video signal input terminal

Ground

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

3.65 9.02 6.04

2.51 8.92 5.82

3.06 2.2 2.2

4.4 7.15 5.15

4.52 7.15 5.15

6.7 7.52 5.68

1.35 9 6

3.4 9.04 5.91

8.24 2.78 1.96

4.32 9.15 5.94

0 0 0

Digital Multimeter

(continued)

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

15 Audio signal output 3 9.24 5.98

16 Decoupling capacitor connection 0

17 Video input 3.4 9.12 5.94

18 Black current control input 5.81 9.22 5.88

19 Blue (B) signal output 3.04 6.19 5.2

20 Green (G) signal output 3.1 6.19 5.23

21 Red (R) signal output 3.2 6.2 5.26

22 Beam current control 2.1 8.22 6.04

23 Red (R) signal input 3.6 9.01 6.12

24 Green (G) signal input 3.61 9.01 6.12

25 Blue (B) signal input 3.6 9.01 6.12

Selectable primary color signal input

control

27 Luminance signal input 3.26 9.25 5.87

28 Luminance signal output 3.26 9.25 5.87

29 B-Y color difference signal output 2.38 8.5 5.91

30 R-Y color difference signal output 2.37 8.5 5.91

31 B-Y color difference signal input 2.38 8.5 5.91

32 R-Y color difference signal input 2.37 8.5 5.91

Sub-carrier output for SECAM

demodulation

34 3.58MHz crystal oscillator 2.54 8.02 6.04

35 4.43MHz crystal oscillator 2.53 8.02 6.04

36 APC low pass filter 4.99 9.37 6

37 Horizontal starting supply voltage 8.22 2.64 2.56

38 Composite video output 3.68 7.52 6.11

39 Black level stretch 4.95 9.26 4.93

40 Line drive pulse output 3.55 3.5 3.49

Horizontal flyback pulse input /

sandcastle pulse output

42 Line discriminator 3.66 8.81 6.04

43 Line discriminator 3.92 9.31 6.04

44 Ground 0 0 0

45 Vertical frequency parabola output 0.73 9.05 5.97

46 Field drive signal output 2.32 9.3 5.97

47 Field drive signal output 2.35 9.3 5.97

48 IF signal input 4.62 8.52 6.2

49 IF signal input 4.62 8.52 6.2

50 High voltage detection input 2.05 8.04 6.14

51 Vertical sawtooth generation 3.8 8.65 6.09

52 Vertical reference bias setting 3.9 8.89 6.05

53 AGC filter for IF amplifier 4.49 9.25 6

54 AGC output for IF amplifier 0.67 10.05 5.82

55 Audio deemphasis 2.93 8.93 6.12

56 Audio decoupling

0.1 1 1

0.35 6.78 5.96

0.76 8.82 5.92

4.02 9.37 6.08

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

Table 7 Functions and Service Data of TDA8350 (N401)’s Pins

Pin No. Function Description

1 Vertical drive input (positive) 2.32 9.4 5.84

2 Vertical drive input (negative) 2.3 9.4 5.87

3 Feedback input 8.15 5.81 4.72

4 Supply voltage 16.27 7.99 7.62

5 Output 1 8.14 5.88 4.72

6 Not connected 0

7 Ground 0 0 0

8 Pump supply voltage input 46.94 4.29

9 Output 1 8.22 5.92 4.71

10 Guard output 0.28 8.51 5.899

11 Pincushion output 16.99 9.45 4.16

12 Pincushion input (negative) 0.25 9.12 5.93

13 Pincushion input (positive) 0 0 0

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

Table 8 Functions and Service Data of TDA7057AQ (N601)’s Pins

Pin No. Function Description

1 Volume control input 1.03 6.88 6.15

2 Not connected 0

3 Audio R signal input 2.45 12.68 6.5

4 Supply voltage 16.18 0.46 0.46

5 Audio L signal input 2.45 12.6 6.5

6 Ground 0 0 0

7 Volume control input 1.03 6.88 6.15

8 Left channel in-phase signal output 7.64 6.48 5.6

9 Ground 0 0 0

10 Left channel inverting signal output 7.71 6.47 5.6

11 Right channel inverting signal output 7.67 6.47 5.6

12 Ground 0 0 0

13 Right channel in-phase signal output 7.79 6.48 5.6

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

Table 9 Functions and Service Data of TDA6017Q’s Pins

Pin No. Function Description

1 G inverting input 2.94 5.72 4.96

2 R inverting input 3 5.72 4.96

3 B inverting input 2.91 5.72 4.96

4 Ground 0 0 0

5 Black level current input 6.5 19.28 5.68

6 Supply voltage 198.65 4.53

7 B output 103 5.48

8 R output 98.6 5.48

9 G output 100.6 5.48

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS (continued)

Table 10 Functions and Service Data of HEF4052 (DS01)’s Pins

Pin No. Function Description

1 Switch input 0.3 7.5 26 2 Switch input 0 7.5 26 3 Switch output 0 2.3 2.3 4 Switch input 0.4 7.5 26 5 Switch input 0 7.5 26 6 Inhibit terminal 0 0 0 7 VEE 0 0 0 8 Ground 0 0 0

9 Control signal input 3.5 10 6.3 10 Control signal input 3.5 10 6.3 11 Switch input 3 0.5 0.5 12 Switch input 3 0.5 0.5 13 Switch output 3.5 2.3 2.3 14 Switch input 2.8 0.5 0.5 15 Switch input 3 0.5 0.5 16 Supply voltage 7.8 1.5 1.5

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

Table 11 Functions and Service Data of HEF4053 (DS02)’s Pins

Pin No. Function Description

1 Signal input 0 9.81 6.15

2 Signal input 0 0 0

3 Signal input 0 9.81 6.15

4 Signal output 0 6.66 6.21

5 Signal input 0 0 0

6 Ground 0 0 0

7 Ground 0 0 0

8 Ground 0 0 0

9 Control signal input 0.12 7.97 5.7 10 Control signal input 0.12 7.99 5.7 11 Control signal input 4.98 7.8 5.6 12 Signal input 0 0 0 13 0 9.81 6.15

Signal output 14 Signal input 0 6.9 6.4 15 Audio output 0 6.95 6.4 16 Supply voltage 5.09 6.89 4.44

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

Table 12 Functions and Service Data of TDQ-6F2M’s Pinss Pins

Pin No. Function Description

1 AGC 0.98 9.56 6.04 2 NC 26.73 6.85 3 NC 0.61 9.76 7.39 4 SCL 4.89 9.58 5.13 5 SDA 4.88 9.58 5.12 6 VDD 5 2.2 2.2 7 NC 4.9 2.2 2.2 8 NC 0 0 0

9 BT 3.021 13.07 10 NC 0 0 0 11 IF 0

Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)

Digital Multimeter

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

(continued)

Note

The TV receives NTSC color bar with 1KHz sine wave audio reception in Normal mode when

measuring voltage and resistance with a GDM-8145 multimeter (Max. resistance: 20 KΩ, Max. DC

voltage: 20V).

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

(continued)

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

(continued)

Measure with a GOS-622G oscilloscope.

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

(continued)

SERVICE MANUAL

IC DATA AND WAVEFORMS OF KEY POINTS

Serial No. Type

V104 C388A 2.12 8.35 1.35

V609 C1815 2.99 8.47 2.29

V601S C1815 2.54 6.94 1.88

V602S C1815 6.94 8.48 6.24

V204 C1815 2.07 5.08 1.37

V227 C1815 3.66 8.43 2.99

V432 BSN274 2.35 10.70 0

V433 BV2720DF -0.07 113.6 0

V436 A1015 1.67 0 1.98

V437 A1015 8.53 2.05 8.53

V438 C1815 0 8.52 0

V001 C1815 0.06 4.73 0

V002 C1815 0.12 4.28 0

V009 A1015 4.33 4.96 5

V631A C1815 0.19 1.03 0

V632A A1015 8.52 -0.10 8.41

V289 C1815 0.18 7.41 0

V862 C1815 0.18 7.37 0

V863 C3852 0.18 5.17 0

V840 BVZ334 3.92 156.90 0

VS10 C1815 2.40 5.13 1.78

VS20 C1815 2.40 5.13 1.78

VS30 C1815 2.98 5.13 2.32

V217 C1815 0.35 8.53 0

Base

(B)

Collector

(C)

Emitter

(E)

Serial No. Type Input Reference Output

N861 LM317 11.56 7.37 8.63

N863 L7805 15.65 0 5.00

N851 C3852

N402 LM317 15.64 7.41 8.66

+B voltage: 134.49V

AV voltage: 16.23V

Frame supply voltage: 16.73V

(continued)

(B)

5.74

(C)

11.56

(E)

5.17

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

SERVICE MANUAL

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 at least 30 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.

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 RV801 to the mechanical center and AC power supply to 120±2V.

2) Connect a digital voltmeter to two pins of C898, and then turn on the TV.

3) Receive Philips test pattern signals.

4) Adjust RN823 to 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.

20 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 27.5±0.5KV.

4) Set the brightness to minimum or maximum, and ensure high voltage not beyond limitation of 30KV

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.

Before Adjusting After Adjusting

SERVICE MANUAL

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. 26.

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 signals.

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 centre 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.

Glass Cloth Tapes

Deflection Coil

Purity/Convergence Ma

net Module

Dummy Wedge

Fig. 26

Rubber Wedge

Adhesive

Deflection Yoke

SERVICE MANUAL

Adj

(

SET-UP ADJUSTMENTS (continued) SET-UP ADJUSTMENTS (continued)

6-pole Magnet

4-pole Magnet

Purity Magnet

Conver

2. Convergence Adjustment 2. Convergence Adjustment

Note: Note: Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.

● Center convergence adjustment ● Center convergence adjustment

1) Receive the grille test pattern signals. 1) Receive the grille test pattern signals.

2) Set the brightness and contrast properly. 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

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.

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

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.

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

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.

affects the vertical lines and rotating both magnets affects the horizontal lines.

6) Repeat steps 3)6) Repeat steps 3) 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.26. (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.

ence Magnet Assembl

5) keeping in mind red, green and blue movement. 4-pole magnet and 6-pole

ust the Angle (Vertical Lines)

Adjustment of Magnets

Fig. 27

Rotate Two Tabs At the Same Time

Fixed

Horizontal Lines)

SERVICE MANUAL

SET-UP ADJUSTMENTS (continued)

9) Stick three adhesive tapes on wedges as shown in Fig. 26.

BLU

Red

4-pole Magnet Movement 6-pole Magnet Movement

Incline the Yoke up (or down) Incline the Yoke Right(or left)

BLU Red Red/BLU GRN

Red/BLU

GRN

Center Convergence by Convergence Magnets

Circumference Convergence by DEF Yoke

Fig. 28

SERVICE MODE AND BUS DATA

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.

Description Data Description Data Description Data Description Data Description Data

AFW:240KHz 1 De interta 0 S CORRECT 20 AUTO ADJUST 0 OPT SPKON 0

IF-PLL 1 H shift 40 V SHIFT 32 SUB BRIGHT 27 OPT SPATAL 1

AGC over f 9 H shift-50 32 V SHIFT-50 32 LOUDNESS 18 OPT COLOR 0

IFS 0 E/W WIDE 45 V 200M 25 CNTRST MAX 63 OPT V-CHIP 1

MOD 0 PARABOLA 32 V SCROLL 31 CNTRST MID 31 OPT CCD 1

Fixed Avd 1 E/WCORNER 63 V HALF 0 CNTRST MIN 0 OPT PWR-ON 1

Sound Mute 0 TRAPZIUM 23 SPK PRESCL 55 COLOR CORE 31 SRCH SPEED 0

SERVICE MANUAL

Auto Limit 0 OSDH·POS 13 AV PRESCAL 66 SPATIAL 32

VOLUME 0 V CENTER 31 ST SPECTRL 31 SUB TINT 31 MSP/TDA 0

Blank HOB 0 V AMP 30 ST TIM CVR 7 OPT STEREO 0

ROM CORREC

Press the or button 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.

DS01 DS02 Door Turnover Control

DS01 DS02

9 10 11 9 11

TV H H L H

AV1 H H L H

AV2 L L L L

AV3 L L H L

S-VIDEO L L H L

CH04T1009 BUS DATA

Item Symbol Description Bus Data

MENU.00

V.POS /50H VERTICAL POSITION /50Hz 34

H.PHSH /50H HORIZONTAL PHASE /50Hz 8

V.SIZE /50H VERTICAL SIZE /50Hz 84

V.POS /60H VERTICAL POSITION /60Hz 37

V.PH /60H HORIZONTAL PHASE /60Hz 13

V.SIZE /60H VERTICAL SIZE /60Hz 55

V.SC VERTICAL S-CORRECTION 4

V,LINE VERTICAL LINE 18

V.SIZE CMP VERTICAL SIZE COMPENSATION 7

MENU.01

SUB.BIGHT SUB-BRIGHT 59

SUB.CONT SUB-CONTRAST 63

V.KILL VERTICAL KILL 0

RF.AGC RF AGC 15

R.BIAS RED BIAS 32

G.BIAS GREEN BIAS 60

B.BIAS BLUE BIAS 16

R.DRIVE RED DRIVE 72

SERVICE MANUAL

G.DRIVE GREEN DRIVE 15

B.DRIVE BLUE DRIVE 93

MENU.02

H.AFC HORIZONTAL APC GIAN 0

H.BLK.L HORIZONTAL BLANKING LEFT 4

H.BLK.R HORIZONTAL BLANKING RIGHT 4

CROS.B/W CROSSHATCH BLACK/WHITE 0

VIDEO.LVL VIDEO LEVEL 4

FM.LEVEL FM LEVEL 1

MENU.03

FM.MUTE FM MUTE 0

AUDIO.MUTE AUDIO MUIE 0

VIDEO.MUTE VIDEO MUTE 0

SND.TRAP SOUND TRAP 0

MENU.04

SUB.COLOR SUB COLOR 31

SUB.TINT SUB TINT 24

S.SHARP SUB SHARP 31

CORING. CORING GAIN 1

C.EXT EXTERNAL CHROMA 0

C.BYPASS CHROMA BAND-PASS BYPASS 0

C.KILL ON COLOR KILL ON 0

MENU.05

BLANK.DEF BLANK DEFEAT 0

BLK.ST.DEF 1

FBP.BLK.SW FLYBACK PULSES HORIZONTAL BLANKING SWITCH 0

FILT.SYS FILTER SYSTEM SELECT Y/C FILTER MODE 0

VOL.FIL VOLUME FILTER 0

VIF.SYS.SW VIF SYSTEM SWITCH 0

VIDEO.SW VIDEO SWITCH 0

MENU.06

R/B ANGLE R-Y/B-Y ANGLE 9

GREY MODE GREY MODE 0

V.SETUP VERTICAL SETUP 1

B.GAM.SEL 3

SERVICE MANUAL

RG.GAM.DEF 1

MENU.07

BRT.ABL.TH BRIGHT ABL THRESHOLD 7

EM.ABL.DEF 0

BRT.ABL.DF BRIGHT ABL DEFEAT 1

MID.STP.DF BRIGHT MID STOP DEFEAT 1

MENU.08

DIGITAL.OSD DIGITAL OSD MODE 0

OSD.CONT OSD CONTRAST CONTROL 1

OSD.H.POS OSD HORIZONTAL POSITION 22

MENU.09

H.FREQ HORIZONTAL FREQUENCY 27

C.KILL.OFF COLOR KILL OFF 0

AUDIO.SW AUDEO SWITCH 0

T.DISBLE TEST MODE SWITCH DISABLE 1

OPT.LOGO OPTION LOGO 0

OPT.VID SW OPTION VIDEO SWITCH 0

MENU.10

OPT.TV.AV OPTION TV/AV 1

OPT.AV1/2 OPTION AV1/2

OPT.AV3 OPTION AV3

OPT.COLOR OPTION COLOR 0

OPT.V-CHIP OPTION V-CHIP 1

OPT.CCD OPTION CCD 1

OPT.CLOCK OPTION CLOCK 1

OPT.P-ON OPTION P-ON 0

SRCH.SPEED SEARCH SPEED 0

ROM.CORREC ROM CORRECTION 0

SERVICE MANUAL

TROUBLESHOOTING FLOW CHARTS

1. Power

1.1 The power indicator lights but with no raster and sound.

1.2 The SMPS has no voltage output.

SERVICE MANUAL

TROUBLESHOOTING FLOW CHARTS (continued)

1.3 The SMPS outputs low voltage and indicator doesn’t light.

1.4 The power indicator lights but the SMPS is still in the Standby mode.

2. Control System

2.1 The power indicator lights, but the CPU cannot enter the Operation mode after power-on again.

SERVICE MANUAL

TROUBLESHOOTING FLOW CHARTS (continued)

2.2 No character appears on the screen.

2.3 Channel number remains unchanged during auto program.

3. Video Signal Processor

3.1 No color

SERVICE MANUAL

TROUBLESHOOTING FLOW CHARTS (continued)

3.2 The color is abnormal.

4. Horizontal/Vertical Scan Circuit

4.1 No raster

SERVICE MANUAL

TROUBLESHOOTING FLOW CHARTS (continued)

4.2 Line and field are not sync.

4.3 Raster is displayed as a horizontal bright line on the screen.

SERVICE MANUAL

TROUBLESHOOTING FLOW CHARTS (continued)

4.4 The field amplitude of raster is not enough.

4.5 East-west pincushion distortion

5. Audio System

5.1 No sound

SERVICE MANUAL

SERVICE SPARE PARTS LIST

APPENDIX

1. CIRCUIT DIAGRAM

2. FINAL WIRING DIAGRAM

3. FINAL ASSEMBLY DIAGRAM

4. PRINTED CIRCUIT BOARD DIAGRAMS

APPENDIX 1: CIRCUIT DIAGRAM OF AT2408 (1)

APPENDIX 1: CIRCUIT DIAGRAM OF AT2408 (2)

APPENDIX 1: CIRCUIT DIAGRAM OF AT2408S (1)

APPENDIX 1: CIRCUIT DIAGRAM OF AT2408S (2)

APPENDIX 2: MAIN PCB OF At2408

APPENDIX 2: MAIN PCB OF AT2408S

APPENDIX 2: PCB OF AT2408

CRT RGB PCB

AV P CB

POWER PCB

APPENDIX 2: PCB OF AT2408S

CRT RGB PCB

AV P CB

POWER PCB

APPENDIX 3: FINAL WIRING DIAGRAM OF AT2408

From Right Speak

Cord Plug

XP205

Cord Plug

Red

Black

To Degaussing Coil

DY PCB Assembly

XS802

XS804

XS805

XS804

Cord Plug

XS803

XP804

XS803

XSY03

XP804

Cord Plug

XP803

Cord Plug

XPK01

Cord Plug

XSK01XSK02

Main PCB Assembly

From Deflection Yoke

XS402

XPS06

XPK02

XPA04B

XSY01

XPA04A

From Left Speaker

Cord Plug

XP205

Cord Plug

XPA04A

To CRT's Ground Wire

XPY01

CRT RGB PCB Assembly

GND2

GND1

XPY03

Cord Plug

XPY01

Cord Plug

APPENDIX 4: FINAL ASSEMBLY OF AT2408

APPENDIX 4: FINAL ASSEMBLY OF AT2408S

Group component lists of AT2408&AT2408S

Part name CRT Type

Remote control Remote control Remote control Remote control CRT assembly

CRT assembl Front cover assembl Back cover Main PCB assembly

Main PCB assembly

Power PCB assembl AV PCB assembl AV PCB assembl CRT RGB PCB assembl Control PCB assembl

Old Part number

TYPE:K12C-C1; When using CH04T1002 CPU (for AT2408S only) K12C-C1

TYPE:K12K-C2; When using CH04T1009 CPU (for AT2408S only) K12K-C2

TYPE:K12B-C2; When using CH04T1002 CPU (for AT2408 only) K12B-C2

TYPE:K12L-C1; When using CH04T1009 CPU (for AT2408 only) K12L-C1

For IRICO or Shanghai Novel CRT 64SX505Y22-DC02

For LG CRT A59KYL220X08

For AT2408 only for AT2408 ONLY, JUC7.820.425-2,

JUC7.820.775

For AT2408S only for AT2408S ONLY, JUC7.820.425-2,

JUC7.820.775

For AT2408/2408S and KT2406 JUC7.820.427-1, JUC7.820.774

For AT2402S/AT2408S only JUC.820.426-3

For AT2408 only JUC.820.426-3

JUC7.820.428

JUC7.820.429

New Part number List

8201800271L

8201801682L $15.00

8201800032L

8201800271L

8537000370C01

8537000370C02

8611604570C

8807400230C

8667206130C04

8667206130C05

8667206140C02

8667206160C01

8667206160C02

8667206150C01

8667206120C

$15.00

$98.00

$43.26

$11.88

$102.00

$23.82

$11.88

$28.80

6/24/2003

APEX DIGITAL TELEVISION In-Warranty Schedule by Model

Carry-In

Service

In Home

LIMITED WARRANTY

Product Model No.

Remote Control

13 inch

AT1302 90 90 90 90 N N N N/A N/A N/A N/A N/A

Labor

CRT

Stock

Repair

Yes/NoYes/No Yes/NoParts

REIMBURSEMENT RATES

Carry-In

Minor Major Minor Major Repair

Home Service

Stock

AT1308 90 90 90 90 N N N N/A N/A N/A N/A N/A

20 inch

AT2002 / AT2002S 365 90 90 365 N N N N/A N/A N/A N/A N/A AT2008 / AT2008S 365 90 90 365 N N N N/A N/A N/A N/A N/A GT2011J 365 90 90 N N N N/A N/A N/A N/A N/A GT2011S 365 90 90 365 N N N N/A N/A N/A N/A N/A GT2015 365 90 90 365 N N N N/A N/A N/A N/A N/A GT2015DV 365 90 90 365 N N N N/A N/A N/A N/A N/A KT2006

24 inch

2&3

1 YEAR STORE REPLACEMENT

AT2402 365 90 90 365 N N N N/A N/A N/A N/A N/A AT2408 / AT2408S 365 90 90 365 N N N N/A N/A N/A N/A N/A GT2411S 365 90 90 365 GT2415 365 90 90 365 N N N PF2425 365 90 90 730 N N N N/A N/A N/A N/A N/A KT2406 365 90 90 365 Y N N

25 inch

N/A N/A N/A N/A N/A

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AT2502 365 90 90 365 N N N N/A N/A N/A N/A N/A AT2502S 365 90 90 365 N N N N/A N/A N/A N/A N/A

27 inch

AT2702 365 90 90 365 Y Y Y AT2702S 365 90 90 365 Y Y Y AT2708 / AT2708S 365 90 90 365 Y Y Y GT2711S 365 90 90 365 Y Y Y GT2715 365 90 90 365 Y Y Y PF2725 365 90 90 730 Y Y Y GT2715DV 365 90 90 365 Y Y Y

32 inch

AT3208S 365 90 90 365 Y Y Y GT3215 365 90 90 365 Y Y Y PF3225 365 90 90 730 Y Y Y KT3226 365 90 90 730 Y Y Y

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PROJECTION GB4308 365 90 365 730 Y Y Y GB43HD09 365 90 365 365 Y Y Y GB5108 365 90 365 730 Y Y Y GB51HD09 365 90 365 365 Y Y Y GB55HD09W GB65HD09W 365 90 365 365 Y Y Y

Limited Warranty is printed on the last page of the owner's manual

365 90 365 365 Y Y Y

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2 All defective units 13" - 25 "during the first 90 days of ownership will be exchanged at the original place of purchase. Dealer may contact APEX to receive a Return Authorization from Apex for credit or exchange.

3 Should the picture tube fail during the In-Warranty period the product will be exchanged. The customer is responsible for the Service Center diagnostic fee after the initial labor warranty period and for all packing, transportation and insurance charges.

4 See Master Dealer File for Rates for each Dealer

NOTE: All handling, packing, shipping or freight charges are the responsibility of the customer. 1

Apex at2408s schematic

Specifications and Main Features

Frequently Asked Questions

User Manual