DAEWOO DTJ - 28A6F, DTJ - 28A7F, DTJ - 28B1F, DTJ - 28G6F, DTJ - 28G7F Service Manual

...

S/M No: CP810P-010

Service Manual

66 Cm STEREO Colour Television

CHASSIS : CP-810

MODEL : DTJ - 28A6F

DTJ - 28A7F DTJ - 28B1F DTJ - 28G6F DTJ - 28G7F

DTJ - 28G8F

D AEWOO ELECTR ONICS CO., L

http://svc.dwe.co .kr MAR,2000

TD.

TABLE OF CONTENTS

1. Safety Instruction ........................................................................................................................ 2

2. Specifications .............................................................................................................................. 3

3. Circuit block Diagram ................................................................................................................. 5

4. Alignment Instructions ............................................................................................................... 6

5. IC Description .............................................................................................................................. 12

6. IC DC Voltage Charts .................................................................................................................. 32

7. Service Parts List/Recommendable Spare Parts List .............................................................. 35

8. Mechanical Exploded View ......................................................................................................... 45

9. Printed Circuit Board .................................................................................................................. 51

10. Schematic Diagram ..................................................................................................................... 52

1. Safety Instruction

WARNING

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can prodece potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 23-24kv at max beam current. The high voltage must not, under any circumstances, exceed 30kv.

Each time a receiver require servicing, the high volt-

age should be checked. It is imprortant to use an accurate and reliable high voltage meter.

: Only competent service personnel may carry out work involving the testing or repair of this equipment

2. The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-RAY RADIATION protection, the replacement tube must be exactly the same type tube as specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. Operation of the receiver outside the cabinet or with the back board removed involves a shock hazard from the receiver.

1) Servicing should not be attempted by anyone who is

not thoroughly familiar with the precautions necessary when working on high-voltage equipment.

2) Dischange the high potential of the picture tube

before handling the tube. The picture tube is highly evacuated and if broken, glass fragments will be violently expelled.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this 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 replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements, electrical compo-

2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List.

3. When replacing a high wattage resistor ( oxide metal film resistor ) in circuit board, keep the resistor 10mm away from circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC230 volts, 50Hz. NEVER connect to DC supply or any other power or frequency.

nents having such features are identified designated symbol on the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characterisitics as specifide in the parts list may create X-RAY Radiation.

2. Specifications

CRT 28" : A66EAK071X54 ( PHILIPS ) System PAL/SECAM-B/G, D/K, PAL-I/I’, SECAM-L/L’, NTSC-3.58/4.43 (Play back ) Main Voltage 230V AC, 50Hz Power Consumption Stand-by mode : 2.0 Watts

Normal operating mode : 80 Watts

Sound output 10 + 10 Watts, 10% THD at RF 60% mod. ( 1 kHz ) Speaker 12W 8ohm x 2 EA Antenna Impedance 75 ohm unbalanced input (Din Standard ) Tuning system Frequency Synthesize(FS) Tuning System Tuner DT5-BF14D, EL2782-105-B Number of Program 100 programs Aux. Terminal 21 pin EURO-SCART jack ( AV input, TV output, RGB input )

Remote controller R-22D05 with 2 "AAA" type batteries Teletext TOP(5 Page memory) & FLOF(7 Page memory)

OSD language - West : English, German, French, Italian, Spanish, Nethelands, Swedish

21 pin EURO-SCART jack ( AV input, S-VHS input ) RCA type AV input jack Headphone jack ( 3.5 mm ) JACK AUDIO TERMINAL (AUDIO OUT L, R)

- West option : English, German/Dutch/Flemish, French, Italian, Spanish/Portuguese, Swedish/Finnish/Danish, Hungarian, Rumanian, Turkish

- East option : Polish, Czech/Slovak, Rumanian, Servo-croat, German/Dutch/Flemish, French, Estonian, Lettish

- East : English, Russian, Polish, Rumanian, Czech, Hungarian

PIN Signal Designation Matching Value

Specifications

1 Audio Out (linked with 3) 2 Audio In (linked with 6) 3 Audio Out (linked with 1) 4 Audio Earth 5 Blue Earth 6 Audio in (linked with 2) 7 Blue in 8 Slow (Function) Switching 9 Green Earth 10 NC 11 Green In 12 NC 13 Red Earth 14 Rapid(Blanking) Switching Earth 15 Red In, C In 16 Rapid(Blanking) switching

0.5Vrms, Imp < 1 k (RF 60% MOD)

0.5Vrms, Imp < 10 k

0.5Vrms, Imp < 1 k (RF 60% MOD)

0.5Vrms, Imp < 10 k (RF 60% MOD)

0.7Vpp 2dB, Imp 75

TV : 0-2V, PERI : 9.5 - 12V, Imp > 10 k

0.7Vpp 2dB, Imp 75

Logic 0 : 0 - 0.4V, Logic 1 : 1 - 3V, Imp 75

17 Video Earth 18 Rapid Blanking Earth 19 Video Out 20 Video In, Y In

21 Common Earth

1Vpp 2dB, Imp 75

3. Circuit Block Diagram

4. Alignment Instructions

4-1. User Remocon R-22D05

R-23D05

Alignment Instructions

* How to Enter the "Service Mode" with user remocon.

1) Set the TV Pr 91

2) Sharpness " MIN " control.

3) Press the Red, Green, Menu buttons in regular sequency within 5 seconds after setting TV power off.

4) You can see the Menu of " Srvice Mode" on the screen.

5) The PR UP/DOWN buttons on the remote controller are used to move the selection bar up or down the Menus.

6) The VOL UP/DOWN buttons on the remote controller are used to adjust levels.

7) If you want to exit from " Service Mode" then power the TV off.

SVC v1

V. Slope

V. Center V. Size S. Curve H. Center H. Width EW. Para EW. Cor T EW. CB EW.Sym R. bias G. b B. b R. drive G. d B. d G2 Sub Bri DT

005

995 220 019

-190 510 382 028 500 021 370 311 311 330 315 330 330 021 048

- You can see the SVC Menu by OSD in TV set.

Alignment Instructions

4-2. AFT Standard B/G, D/K, I and L

1) Set a Signal Generator with

- RF FREQUENCY = 38.9 MHz,

- RF OUTPUT LEVEL = 80 5dBuV

- Pattern = Color Bar

- System = PAL-B/G

2) Connect the Signal Generator RF Output to TP2 (Tuner IF Output). There must be no signal input to the tuner.

3) Set the L109 to TP1(I101, #22) with DC Voltage to 2.5V 0.1V

4-3. AGC

1) Set a Pattern Generator with RF LEVEL 60 3dBuV, RF Frequency 210. 25MHz(10CH), Pattern Color Bar.

2) Connect a OSCILLOSCOPE PROBE to P101 (TUNER AGC INPUT).

3) Set the RBOI to P101(Tuner AGC Input) with DC Voltage to 2.8V 0.2V

4-4. SCREEN (G2)

1) Set a Pattern Generator with - RF Frequency : 210.25MHz (10CH)

- Pattern : RETMA

2) Select the “G2” in Menu

3) And a Horizontal Line will appear on the screen.

4) Adjust the SCREEN VOLUME on FBT barely to see the Horizontal Line.

5) Press the PR UP/DOWN keys to finish the SCREEN adjustment.

4-5. FOCUS

1) Apply a RETMA PATTERN signal.

2) Adjust the FOCUS VOLUME on FBT to obtain optimal resolution.

4-6. GEOMETRY 4-6-1 VERTICAL SLOPE ( Fixed : Adjust if need be )

1) Apply a RETMA PATTERN Signal.

2) Set the TV to Normal I mode.

3) Adjust the higher semicircle and the lower semicircle to be the same, with the V.Slope by volume Up/Down keys.

4-6-2 VERTICAL CENTER

1) Apply a RETMA PATTERN Signal.

2) Set the TV to Normal I mode.

3) Adjust the center of the picture with the V.Center by volume Up/Down keys.

Alignment Instructions

4-6-3 VERTICAL SIZE

* The VERTICAL CENTER adjustment has to be done in advance.

1) Apply a RETMA PATTERN Signal.

2) Set the TV to Normal I mode.

3) Adjust the VERTICAL SIZE of the picture with the select V.size by volume UP/DOWN keys.

4-6-4 VERTICAL S-CORRECTION ( Fixed : Adjust if need be )

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the S-CORRECTION to obtain the same distance between horizontal lines with the S.Curve by volume UP/DOWN keys.

4-6-5 HORIZONTAL CENTER

1) Apply a RETMA PATTERN Signal.

2) Adjust picture centering with the select H.Center by volume UP/DOWN keys.

4-7. EW 4-7-1 WIDTH

1) Apply a RETMA PATTERN Signal.

2) Adjust the horizontal width to make a perfect circle with the select H.Width by volume UP/DOWN keys.

4-7-2 PARA

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the vertical line to straight with the select E.W Para by volume UP/DOWN keys.

4-7-3 CORNER ( Fixed : Adjust if need be )

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the vertical line to straight with the select EW.Cor T by volume UP/DOWN keys.

4-7-4 SYMMETRY ( Fixed : Adjust if need be )

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the symmetrical balance to be suitable with the select EW Sym by volume UP/DOWN keys.

4-8. WHITE BALANCE 4-8-1 RGB Reference R

Alignment Instructions

4-8-2 Beam Reference LOW ( 288, 301 : 10Cd/ ) HIGH ( 288, 301 : 10Cd/ )

4-8-3 Adjust G, B Gain with select Menu G,B of BIAS, DRIVE of select Menu so that R, G, B Bars are on the center position of the analog meter. If R Analog meter is not on center, control the Brightness +/- of user Remocon so as R Analog meter to be on the center position.

4-9. SUB BRIGHT 4-9-1 Pattern : Retma

4-9-2 Adjust the SUB BRIGHT with the select Sub Bri by volume UP/DOWN keys. so that only H-Center parts of picture can be seen.

4-10. DOUBLE TEXT CENTER 4-10-1 Pattern : Pattern RED

4-10-2 Select Menu

4-10-3 Select DT in SVC menu time to see the Double Text Picture. ( Left : RF Picture, Right : Text Picture )

4-10-4 Change the Double Text control keys volume UP/DOWN keys so that the left edge of text picture concur with the right edge of RF picture.

5. IC description

5-1. ST92195 (1) General Description

1.1 INTRODUCTION

The ST92195 microcnontoller is developed and manufactured by STMicroelecrtonics using a proprietary n-well HCMOS process. Its performance derives from the use of a flexible 256-register programming model for ultra-fast context switching and real-time event response. The intelligent onchip peripherals offload the ST9 core from I/O and data management processing tasks allowing critical application tasks to get the maximum use off core resources. The ST92195 MCU supports low power consumption and low voltage operation for power-efficient and low-cost embedded systems.

1.1.1 ST9+Core

The advanced Core consists of the Central Processing Unit (CPU), the Register File and the Interrupt controller. The general-purpose registers can be used as accumulator, Index register, or address pointers. Adjacent register pairs make up 16-bit registers for addressing or 16-bit processing. Although the ST9 has an 8-bit ALU, the chip handles 16-bit operations, including arithmetic, loads/ stores, and memory/register and memory/memory exchanges. Two basic memory spaces are available : Program Memory and the Register File, Which includes the control and status registers of the on-chip peripherals.

1.1.2 Power Saving Modes

To optimize performance versus power consumption, a range of operating modes can be dynamically selected.

Run Mode.

CPU and peripherals running at the maximum clock speed delivered by the phase Locked Loop(PLL) of the Clock Control Unit(CCU).

Wait For Interrupt Mode.

rupt(WFI) instruction suspends program execution until an interrupt request is acknowledged. During WFI, the CPU clock is halted while the peripheral and interrupt controller keep running at a frequency programmable via the CCU. In this mode, the power consumption of the device can be reduced by more than 95%(LP WFI).

Wait For Interrupt Mode.

rupt(WFI) instruction, and if the Watchdog is not enable, the CPU and its peripherals stop operation and the I/O

This is the full speed execution mode with

The Wait For Inter-

ports enter high impedance mode. A reset is necessary to exit from Halt mode.

1.1.3 I/O Ports

Up to 28 I/O lines are dedicated to digital Input/Output. These lines are grouped into up to five I/O Ports and can be configureed on a bit basis under software control to provide timing, status signals, timer and output, analog inputs, external interrupts and serial or parallel I/O.

1.1.4 TV Peripherals

A set of on-chip peripherals form a complete system for TV set and VCR applications:

- Voltage Synthesis

- VPS/WSS Slicer

- Teletext Slicer

- Teletext Display RAM

- OSD

1.1.5 On Screen Display

The human interface is provided by the On Screen Display module, this can produce up to 26 lines of up to 80 characters from a ROM defined 512 character set. The character resolution is 10x10 dot. Four character sizes are supported. Serial attributes allow the user to select foreground and background. Parallel attributes can be used to select additional foreground and background colors and underline on a character by character basis.

1.1.6 Teletext and Display RAM

The internal 8k Teletext and Display storage RAM can be used to store Teletext pages as well as Display parameters.

1.1.7 Teletext, VPS and WSS Data Slicers

The three on-board data slicers using a single external crystal are used to extract the Teletext, VPS and WSS information from the video signal. Hardware Hamming decoding is provided.

1.1.8 Voltage Synthesis Tuning Control

14-bit Voltage Synthesis using the PWM (Pulse Width Modulation)/BRM (Bit Rate Modulation) technique can be used to genetate tuning voltages for TV set applications. The tuning voltage is output on one of two separate output pins.

IC description

1.1.9 PWM Output

Control of TV settings is able to be made with up to eight 8-bit PWM outputs, with a frequency maximum of 23,437Hz at 8-bit resolution(INTCLK=12 MHz). Low resolutions with higher frequency operation can be programmed.

1.1.10 Serial Peripheral Interface (SPI)

The SPI bus is used to communicate with external devices via the SPI, or bus communication standards. The SPI uses one or two lines for serial data and a synchronous clock signal.

I C

1.1.11 Standard Timer (STIM)

The Standard Timer includes a programmable 16-bit down counter and an associated 8-bit prescaler with Single and Continuous counting modes.

1.1.12 Analog/Digital Converter (ADC)

In addition there is a 3 channel Analog to Digital Converter with integral sample and hold, fast 5.7us conversion timer and 6-bit guaranteed resolution.

(2) Feature

to operating temperature range

0 C Up to 24 MHz Operation @5V 10% Minimum instruction cycle time : 375ns at 16MHz internal clock 64K Bytes ROM 256 Bytes RAM of Register file(accumulator or index registers) 256 Bytes of on-chip static RAM 8K Bytes of TDSRAM(Teletext and Display RAM) 56-lead Shrink DIP package 28 fully programmable I/O pins Serial Peripheral Interface Flexible Clock controller for OSD, Data Slicer and Core clocks running from one single low frequency external crystal. Enhanced Display Controller with 26 rows of 40/80 characters

- Serial and Parallel attributes

- 10x10 dot Matrix, 512 ROM characters, definable by user

- 4/3 and 16/9 supported

70 C

- Rounding, fringe, double width, double height, scrolling, cursor, full background colour, semitransparent mode and reduced intensity colour supported Teletext unit, including Data slicer, Acquisition Unit and up to 8K Bytes RAM for Data Storage VPS and Wode Screen Signalling slicer Integrated Sync Extractor and Sync Controller 14-bit Voltage Synthesis for tuning reference voltage Up to 6 external interrupts plus 1 non-maskable interrupt 8x8-bit programmable PWM outputs with 5V opendrain or push-pull capability 16-bit Watchdog timer with 8-bit prescale 16-bit standard timer with 8-bit prescaler usable as a Watchdog timer 3-channel Analog-to-Digital converter ; 6-bit guaranteed Rich instruction set and 14-Addressing modes Versatile Development Tools, including Assembler, Linker, C-compiler, Archiver, Source Level Debugger and Hardware Emulators with Real-Time Operating System available from third parties Piggyback board available for prototyping

IC description

(3) Block Diagram

(4) PIN DESCRIPTION

IC description

RESET Reset (input, active low). The ST9+ is initialised by the Reset signal. With the deactivation of RESET, program execution begins from the Program memory location pointed to by the vector contained in program memory locations 00h and 01h. R/G/B Red/Green/Blue. Video color analog DAC out- puts

FB Fast Blanking. Video analog DAC output. VOD Main power supply voltage(5V 10%, digital) WSCF, WSCR Analog pins for the VPS/WPP slicer line

PLL. MCFM Analog pin for the display pixel frequency multiplier. OSCIN, OSCOUT Oscillator (input and output). These pins connect a parallel-resonant crystal(24MHz maximum), or an external source to the on-chip clock oscillator and buffer. OSCIN is the input of the oscilltor inverter and internal clock generator; OSCOUT is the

HYNC/CSYNC Horizontal/Composite sync. Horizontal or composite video synchronisation input to OSD. Positive or negativety. PXFM Analog pin for the Display Pixel Frequency Multiplier AVDD Analog VDD of PLL. This pin must be tied to VDD externally to the ST92195.

GND Digital circuit ground. AGND Analog circuit ground(must be tied externally to

digital GND). CVBS1 Composite video input signal for the Teletext slicer and sync extraction. CVBS2 Composite video input signal for the VPS/WSS slicer. Pin AC coupled. AVDD1, AVDD2 Analog power supplies(must be tied externally to AVDD).

TXCF Analog pin for the VPS/WSS line PLL. CVBSO, JTDO, JTCK Test pins : leave floating.

output of the oscillator inverter. VSYNC Vertical Sync. Vertical video synchronisation input to OSD. Positive or negative polarity.

Figure 2. Pin Description

JTMS, TEST0 Test pins : must be tied to AVDD2. JTRST0 Test pin : must be tied to GND.

IC description

5-2. VPS 3215C(Video Processor)

(1) Description

The VPC 3215C is a high-quality, single-chip video frontend, which is targeted for 4:3 and 16:9, 100/120Hz TV sets. It can be conbined with other members of the DIGIT3000 IC family (such as CIP 3250A, DDP 3300A, TPU 3040) and/or it can be used with 3rd-party products.

(2) Features

- all-digital video processing

- high-performance adaptive 4H comb filter Y/C separator with adjustable vertical peaking

- multi-standard color decoder PAL/NTSC/SECAM

(3) Block Diagram

including all substandards

- 4 composite, 1 S-VHS input, 1 composite output

- integrated high-quality A/D converters and associated

clamp and AGC circuits

- multi-standard sync processing

- linear horizontal scaling (0.25 ... 4), as well as non-linear

horizontal scaling ‘panorama vision’

- PAL + preprocessing (VPC 3215)

- submicron CMOS technology

(4) Pin Descriptions

Pin 1 - Ground, Analog Front-End GND Pin 2 - Ground, Analog Front-End GND Pin 3 - CCU 5 MHz Clock Output CLK5 This pin provides a clock frequency for the TV microcontroller, e.g. a CCU 3000 controller, It is also used by the DDP 3300A display controller as a standby clock. Pin 4 - Standby Supply Voltage V In standby mode, only the clock oscillator is active, GND should be ground reference. Please activate RESQ before powering-up other supplies Pins 6 and 5-XTAL1 Crystal Input

STDBY

These pins are connected to an 20.25MHz crystal oscillator which is digitally tuned by integrated shunt capacitances. The CLK20 and CLK5 clock signals are derived from this oscillator. An external clock can be fed into XTAL1. In this case, clock frequency adjustment must be switched off. Pin 7 - Ground, Analog Front-End GND Pin 9 - Ground, Output Pad Circuitry GND

Pin 10 - Interlace Output, INTLC This pin supplies the interlace information, 0 indicates first field, 1 indicates second field.

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