5.9.2 POWER SUPPLY PRIMARY PART OPERATIONS 5.9.2.1 Start -up Circuit: VIN 5.9.2.2 STR-F6654 Oscillating Operation 5.9.2.3 STR-F6654 Protection Circuits 5.10 TV START-UP, TV NORMAL RUN AND STAND BY MODE OPERATIONS 5.10.1 TV START-UP OPERATIONS 5.10.1.1 Schematic Diagram For Start-Up Operations 5.10.1.2 TV Start-Up And Microcontroller Initialisation 5.10.2 TV NORMAL RUN AND STAND-BY MODE OPERATIONS 5.10.2.1 TV On Normal Run Mode 5.10.2.2 TV Set On Stand-By Mode SERVICE PARTS LIST 6.1 DTH-29U7ZL 6.2 DTG-2881ZL EXPLODED VIEW 7.1 DTH-29U7 7.2 DTH-29U8 7.3 DTH-2881 7.4 DTH-28W8 7.5 DTG-28W9 PRINTED CIRCULT BOARD 8.1 MAIN PCB 8.2 CRT PCB 8.3 PFC PCB SCHEMATIC DIAGRAM 96
DOCUMENT HISTORY VERSION V1.00 V1.01 DATE 18/11/02 22/11/02 COMMENTS Creation of document (Author M Hearn) for project CP830 100Hz TV. Reformatting of the document, plus insertion of Document History section
1 MAIN FEATURES 1.1 SPECIFICATIONS 1.1.1 GENERAL TV standard Colour system Sound system Power consumption Sound Output Power Speaker Teletext system Aerial input Channel coverage Tuning system Visual screen size Channel indication Program Selection Aux. terminal Tuner AV PAL - SECAM B/G D/K, PAL I/I, SECAM L/L PAL, SECAM PAL, SECAM, PAL 60, NTSC M, NTSC 4.43 NICAM B/G, I, D/K, L, FM 2Carrier B/G, D/K 29"(4:3) Real Flat :84W approx. 28"(16:9) Real Flat : 84W approx. 7W x 2 (at 60% mod, 10%THD) 12W 8 ohm xpages memory FASTEXT (FLOF or TOP) 75 ohm unbalanced Off-air channels, S-cable channels and hyperband frequency synthesiser tuning system 28" : 66cm 29" : 68cm On Screen Display 100 programmes EURO-SCART 1 : Audio / Video In and Out, R/G/B In, Slow and Fast switching. EURO-SCART 2 : Audio / Video In and Out, SVHS In. AV3 : Audio-Video Jack on front of cabinet. Headphone jack (3.5 mm) on front of cabinet SVHS3 (option) : Jack on front of cabinet ? sound input common with AV3. R-46G22

Remote Control Unit

1.1.2 EURO-SCART 1 (21 Pin) Pin Signal Description 1 Audio Output Right 2 Audio Input Right 3 Audio Output Left 4 Audio Earth 5 Blue Earth 6 Audio Input Left 7 Blue Input
Matching value 0.5 Vrms, Impedance < 1 k , ( RF 54% Mod ) 0.5 Vrms, Impedance > 10 k 0.5 Vrms, Impedance < 1 k , ( RF 54% Mod )
0.5 Vrms, Impedance > 10 k 0.7 Vpp 0.1V, Impedance 75
21 Green Earth N.C. Green Input N.C. Red Earth Blanking Earth Red Input Fast Switching Video Out Earth Video In Earth Video Output Video Input Common Earth

0.7 Vpp

0.1V, Impedance 75
0.7 Vpp 0.1V, Impedance to 0.4V : Logic 0 , 1 to 3V : Logic 1 , Impedance 75

1 Vpp 1 Vpp

3dB, Impedance 75 3dB, Impedance 75
1.1.3 EURO-SCART 2 (21 Pin) Pin 21 Signal Description Audio Output Right Audio Input Right Audio Output Left Audio Earth Earth Audio Input Left N.C. N.C. N.C. N.C. N.C. N.C. Earth Earth Chroma Input N.C. Earth Video In Earth Video Output Video Input, Y In. Common Earth Matching value 0.5 Vrms, Impedance < 1 k ( RF 54% Mod ) 0.5 Vrms, Impedance > 10 k 0.5 Vrms, Impedance < 1 k , ( RF 54% Mod )

2 SAFETY INSTRUCTION WARNING: Only competent service personnel may carry out work involving the testing or repair of this equipment. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce 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 25-26 KV (20 -21 ) or 26 KV (25 - 28 ) at max beam current. The high voltage must not, under any circumstances, exceed 27.5 KV (20 ), 29KV (21 ), 29.5 KV (25 ) or 30 KV (28 ). Each time a receiver requires servicing, the high voltage should be checked. It is important to use an accurate and reliable high voltage meter. 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 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. Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when working on high voltage equipment. Discharge 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. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List. When replacing a high wattage resistor (metal oxide film resistor) in the circuit board, keep the resistor 10 mm away from circuit board. Keep wires away from high voltage or high temperature components. This receiver must operate under AC 230 volts, 5O Hz. NEVER connect to a DC supply or any other voltage or frequency. PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this equipment 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 components having such features are identified by designated symbol on the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitutes replacement parts which do not have the same safety characteristics as specified in the parts list may create X-RAY Radiation.

3 ALIGNMENT INSTRUCTIONS 3.1MICROCONTROLLER CONFIGURATION : SERVICE MODE To switch the TV set into service mode please see instruction below. 1 - Select PR. number - Adjust sharpness to minimum and exit all menus. 3 - Within 2 seconds press the key sequence : RED - GREEN - menu The software version is displayed beside the word Service, e.g. SERVICE V1.00. To exit SERVICE menu press menu key or Std By key. 3.2SERVICE MODE NAVIGATION Pr Up/Down remote keys : cycle through the service items available. Vol -/+ remote keys : Dec./Increment the values within range - Cycle trough option bits. OK key : Toggle bits in option byte Order 21 Item HOR CEN RED GAIN GRN GAIN BLUE GAIN RED BIAS GRN BIAS AGC LEVEL G2 - SCREEN AFT OPTION1 OPTION2 PARABOLA HOR WIDTH CORNER T CORNER B HOR. PARAL V. LINEAR EW TRAPEZ S CORRECT VERT CENT VERT SIZE Default setting
3.3 MICROCONTROLLER CONFIGURATION : OPTION BITS There are two option bytes available (16 bits in all). These option bits are available from Service mode. First find the OPTION1 or OPTION2 control, and then use the Volume PLUS/MINUS buttons on the remote control keypad to locate the bits, and OK key to toggle them. The table below shows the two option bytes available;
3.3.1 OPTION 1 B7 TOP text OFF TOP text ON B6 FASTEXT (FLOF) OFF FASTEXT (FLOF) ON B5 TUBE 4:3 TUBE 16:9 B4 Headphone Volume/Balance control OFF Headphone Volume/Balance control ON B3 Dolby Virtual OFF Dolby Virtual ON B2 SVHS 3 disable SVHS 3 enable B1 B0 Tuner options 00 = Philips 01 = not used 10 = ALPS 11 = PARTSNIC (DW)
3.3.2 OPTION 2 B7 B6 B5 B4 B3 B2 B1 BFixed to 0 JVC remote control AVL control OFF PICTURE TILT ON Program list enabled See table below. 0 Daewoo Remote control AVL control ON PICTURE TILT OFF Program list disabled
Beam Current Tube 0.95 1.00 4/3 - Super Flat, 16/9 Super Flat 1.05 1.10 1.20 1.25 4/3 - Real Flat, 16/9 Real Flat 1.30 1.35 All values modified are immediately memorised in eeprom. 3.4 TV SET ALIGNMENT 3.4.1 LOCAL OSCILLATOR ALIGNMENT Tune a colour bar pattern. The frequency of the signal carrier must be accurate ( Max +/- 10KHz deviation from the nominal channel frequency). Find AFT item in service mode. Adjust the coil L150 to bring the cursor to central position : 32. 3.4.2 G2 ALIGNMENT - Tune a colour bar pattern. - Find the G2 - SCREEN item in service mode. - Adjust screen volume ( on FBT ) to bring the cursor to central position : 32.

Multi-standard colour decoder - PAL/NTSC/SECAM including all substandards - Automatic recognition of chroma standard - Only one crystal necessary for all standards RGB-FBL or YUV-H-V input - 8 bit amplitude resolution for RGB or YUV - 8 bit amplitude resolution for FBL or H ITU656 support - ITU656 output - DS656 output (double-scan 656like output) Noise reduction - Motion adaptive temporal noise reduction - Field-based temporal noise reduction for luminance and chrominance - Different motion detectors for luminance and chrominance or identical - Flexible programming of the temporal noise reduction parameters - Automatic measurement of the noise level Horizontal scaling of the 1fH signal - Split-screen possible with additional PiP or Text processor Flexible digital horizontal scaling of the 2fH signal (Not used in this chassis) - Scaling factors: 3,. [2 pixel resolution],., 0.75 including 16:9 compatibility - 5 zone panorama generator Embedded memory - On-chip memory controller - Embedded DRAM core for field memory - SRAM for PAL/SECAM delay line Data format 4:2:2 Flexible clock and synchronisation concept - Horizontal line-locked or free-running mode - Vertical locked or free-running mode Scan-rate-conversion - Simple interlaced modes (100/120 Hz): AABB, AAAA, BBBB (9402A/9412A only) Flexible output sync controller - Flexible positioning of the output signal - Flexible programming of the output sync raster - Blank signal generation Signal manipulations - Still field - Insertion of coloured background - Windowing - Vertical chrominance shift for improved VCR picture quality Sharpness improvement (not used in this chassis) - Digital color transition improvement (DCTI) - Peaking (luminance) 1920 active pixel/per line in default configuration I2C-bus control (400 kHz) - selectable I C address 1.8V 5% and 3.3V 5% supply voltages P-MQFP-80 package
4.2.3 PINNING Pin 44 Name cvbs1 cvbs2 cvbs3 cvbs4 cvbs5 cvbs6 cvbs7 Cvbso1 Cvbso2 Cvbso3 Xin Xout Vout Hout i656i7 i656i6 i656i5 i656i4 i656i3 i656i2 i656i1 i656i0 i656iclk Rin1 Gin1 Bin1 Fbl1 Rin2 Gin2 Bin2 Fbl2 V Sda Scl Tms Adr/tdi Reset Clkout Vdd33c Vss33c Vddac1 Vssac1 Vddac2 Vssac2 Vdd33rgb I/O I I I I I I I O O O I O O O I I I I I I I I I I I I I I I I I I I/O I I I I O S S S S S S S Description CVBS input CVBS input CVBS input CVBS input or Y1 CVBS input or C1 CVBS input or Y2 CVBS input or C2 CVBS output 1 CVBS output 2 CVBS output 3 Crystal connection 1 Crystal connection 2 Vertical output Horizontal output 656 input (MSB) 656 input 656 input 656 input 656 input 656 input 656 input 656 input (LSB) 656 input clock R in 1 G in 1 B in 1 Fast Blank input 1 R in 2 G in 2 B in 2 Fast Blank input 2 Vertical pulse for RGB input I2C ?Bus data I2C ?Bus clock Test mode select I2C Address / test data in Reset input Output clock Supply voltage CVBS Supply voltage CVBS Supply voltage CVBS1 Supply voltage CVBS1 Supply voltage CVBS2 Supply voltage CVBS2 Supply voltage RGB

Remarks

Reset when low 27MHz 3.3V 0V 1.8V 0V 1.8V 0V 3.3V

Pin 49

Name Vss33rgb Vddargb Vssargb Vddafbl Vssafbl Vddapll Vddd1 Vssdl Vddd2 Vssd2 Vddd3 Vssd3 Vddd4 Vssd4 Vddp1 Vssp1 Vddp2 Vssp2 Vddp3 Vssp3 Tclk H50 V50 656io0 656io1 656io2 656io3 656io4 656io5 656io6 656io7 656clk 656hin/clkf20 656vin/blank Vssd5
I/O S S S S S S S S S S S S S S S S S S S S I O O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O S
Description Supply voltage RGB Supply voltage for RGB Supply voltage for RGB Supply voltage for FBL Supply voltage for FBL Supply voltage for PLL Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for DRAM Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for digital Supply voltage for digital Testclock Hout 50 Hz Vout 50 Hz Digital input / output Digital input / output Digital input / output Digital input / output Digital input / output Digital input / output Digital input / output Digital input / output Digital input / output clock Separate H input for 20.25 clock output Separate V input for 656 / BLANK output Supply voltage for digital
Remarks 0V 1.8V 0V 1.8V 0V 1.8V 1.8V digital 0V digital 1.8V digital 0V digital 1.8V digital 0V digital 1.8V digital 0V digital 3.3V pad 0V digital 3.3V pad 0V pad 3.3V pad 0V pad Connect to vss
4.3 DDP 3315C - DISPLAY AND DEFLECTION PROCESSOR The DDP 3315C is a mixed-signal single-chip digital display and deflection processor, designed for high-quality backend applications in double scan and HDTV TV sets with 4:3 or 16:9 picture tubes. The interfaces qualify the IC to be combined with state of the art digital scan rate converters, as well as analog HDTV sources. The DDP 3315C contains the entire digital video component, deflection processing, and all analog interfaces to display the picture on a CRT.
4.3.1 BLOCK DIAGRAM OF THE DDP 3315C

R G B FBL

LLC 27/32/ 54 MHz

Clock Generator

analog RGBMatrix R G B

Pr Y Input Pb FBL

Y/ 656 YCrCb CrCb 4:2:2 / 4:1:1

Input Interface

Y Cb Cr

UpconVersion/ Scaling

Y Picture Cb ImproveCr ment

R G B R G B

Matrix / PFG / NCE

Video DAC

Analog RGB Switch

Tube Control

Output Sense Input

SDA SCL

I2C Interface
Sawtooth / Parabola Generation

V EW H/V dynamic focus

V H&V EW

VERT+ VERT E/W

General purpose PWM

Sync Processing

DisplayFreq. Doubling

Colour system PAL PAL SECAM-L PAL SECAMEast
Country GERMANY Scandinavia, Spain France UK USSR Hungary
Sound IF 1 ADC Sound IF 2

Demodulator

Preprocessing
Loudspeaker Sound Processing
Loudspeaker DAC Subwoofer

Source Select

I2S1 I2S2 SCART 1 SCART 2 SCART 3 SCART 4 MONO

Prescale

Headphone Sound Processing

Headphone I2S

DAC DSP SCART Input Select SCART1 ADC Prescale DAC SCART Output Select SCART2

Architecture of MSP341x

Pin connections and short description Pin No. 21 Pin Name NC NC NC INT MUTE ADR_SEL STANDBYQ NC I2C_CL I2C_DA NC NC NC NC NC NC NC DVSUP DVSS NC NC Type Short description Not Connected Not Connected Not Connected Interrupt out Mute out I2C bus Address select Standby ( Low-active) Not Connected I2C Clock I2C data Not Connected Not Connected Not Connected Not Connected Not Connected Not Connected Not Connected Digital power supply +5V Digital Ground Not Connected Not Connected
Out Out In In In / Out In / Out

Pin No. 64

Pin Name NC NC RESETQ DACA_R DACA_L VREF2 DACM_R DACM_L NC NC NC SC2_OUT_R SC2_OUT_L VREF1 SC1_OUT_R SC1_OUT_L CAPL_A AHVSUP CAPL_M AHVSS AGNDC NC NC NC SC3_IN_L SC3_IN_R ASG2 SC2_IN_L SC2_IN_R ASG1 SC1_IN_L SC1_IN_R VREFTOP MONO_IN AVSS AVSUP ANA_IN1+ ANA_IN1NC TESTEN XTAL_IN XTAL_OUT NC

In Out Out Out Out

Out Out Out Out

In In In In In In In

In In In In Out
Short description Not Connected Not Connected Power-On-reset Headphone out right Headphone out left Reference ground 2 high voltage part Loudspeaker out Right Loudspeaker out Left Not Connected Not Connected Not Connected Scart output 2 right Scart output 2 left Reference ground 1 high voltage part Scart output 1, right Scart output 1, left Volume capacitor AUX Analog power supply 8.0V Volume capacitor MAIN Analog ground Analog reference voltage high voltage part Not Connected Not Connected Not Connected Scart input 3 in, left Scart input 3 in, right Analog Shield Ground 2 Scart input 2 in, left Scart input 2 in, right Analog Shield Ground 1 Scart input 1 in, left Scart input 1 in, right Reference voltage IF A/D converter Mono input Analog ground Analog power supply IF input 1 IF common Not Connected Test pin Crystal oscillator Crystal oscillator Test pin
4.5 TDA4470 - MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR 4.5.1 DESCRIPTION The TDA4470 is an integrated bipolar circuit for multi-standard video/sound IF (VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processes all TV video IF signals with negative modulation (e.g., B/G standard), positive modulation (e.g., L standard) and the AM, FM/NICAM sound IF signals. 4.5.2 FEATURES - 5 V supply voltage; low power consumption. - Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true synchronous demodulation. - Very linear video demodulation, good pulse response and excellent intermodulation figures. - VCO circuit operates at picture carrier frequency, the VCO frequency is switchable for L -mode - Alignment-free AFC without external reference circuit, polarity of the AFC curve is switchable. - VIF-AGC for negative modulated signals (peak sync. detection) and for positive modulation (peak white/black level detector). - Tuner AGC with adjustable take over point. - Alignment-free quasi parallel sound (QPS) mixer for FM/NICAM sound IF signals. - Intercarrier output signal is gain controlled (necessary for digital sound processing). - Complete alignment-free AM demodulator with gain controlled AF output. - Separate SIF-AGC with average detection - Two independent SIF inputs - Parallel operation of the AM demodulator and QPS mixer (for NICAM-L stereo sound). 4.5.3 PINNING Pin 1, 4, 9, 6, 19 20, 27, 28 Symbol Vi, SIF1 VSW GND VAGC Vi, VIF CAGC RTOP Itun VO, VID VSW VSW Cbl Cref LF VSW VVCO VAFC VS VO, FM VO, AM Rcomp Vi, SIF2 Function SIF1 input (symmetrical) Input selector switch Ground SIF - AGC (time constant) VIF input (symmetrical) VIF - AGC (time constant) Take Over Point, tuner AGC Tuner AGC output current Video output Standard switch L switch Black level capacitor Internal reference voltage Loop Filter AFC switch VCO circuit AFC output Supply voltage Intercarrier output AF output - AM sound Offset compensation SIF2 input (symmetrical)

5.2.5 VIDEO DEMODULATION AND AMPLIFIER The video IF signal, which is applied from the gain controlled IF amplifier, is multiplied with the inphase component of the VCO signal. The video demodulator is designed for low distortion and large bandwidth. The demodulator output signal passes an integrated low pass filter for attenuation of the residual vision carrier and is fed to the video amplifier. The video amplifier is realised by an operational amplifier with internal feedback and 8 MHz bandwidth (?3 dB). A standard dependent dc level shift in this stage delivers the same sync. level for positive and negative modulation. An additional noise clipping is provided. The video signal is fed to VIF-AGC and to the video output buffer. This amplifier with a 6 dB gain offers easy adaptation of the sound trap. For nominal video IF modulation the video output signal at Pin 12 is 2 Vpp. 5.2.6 SOUND IF AMPLIFIER AND SIF-AGC The SIF amplifier is nearly identical with the 3-stage VIF amplifier. Only the first amplifier stage exists twice and is switchable by a control voltage at Pin 3. Therefore with a minimal external expense it is possible to switch between two different SAW filters. Both SIF inputs features excellent cross-talk attenuation and an input impedance which is independent from the switching condition. The SIF-AGC is related to the average level of AM- or FM-carrier and controls the SIF amplifier to provide a constant SIF signal to the AM demodulator and QPS mixer. 5.2.7 QUASI-PARALLEL-SOUND (QPS) MIXER The QPS mixer is realised by a multiplier. The SIF signal (FM or NICAM carrier) is converted to the intercarrier frequency by the regenerated picture carrier (quadrature signal) which is provided from the VCO. The intercarrier signal is fed via an output amplifier to Pin 24. 5.2.8 STANDARD SWITCH To have equal polarity of the video output signal the polarity can be switched in the demodulation stage in accordance with the TV standard. Additional a standard dependent dc level shift in the video amplifier delivers the same sync. level. In parallel to this, the correct VIF-AGC is selected for positive or negative modulated VIF signals. In the case of negative modulation (e.g., B/G standard) the AM output signal is switched off. For positive modulation (L standard) the AM demodulator and QPS mixer is active. This condition allows a parallel operation of the AM sound signal and the NICAM-L stereo sound. 5.2.9 L SWITCH With a control voltage at Pin 14 the VCO frequency can be switched for setting to the required L value (L standard). Also a fine adjustment of the L -VCO center frequency is possible via a potentiometer. The L switch is only active for positive modulated video IF-signals (standard switch in L mode). 5.2.10 INTERNAL VOLTAGE STABILISER The internal bandgap reference ensures constant performance independent of supply voltage and temperature. 5.3 VIDEO / RGB 5.3.1 FRONT END 5.3.1.1 CVBS Front-End The CVBS front-end consists of the colour-decoding circuit itself, a sync processing circuit for generation of H/V signals out of the CVBS signal, and the luminance processing. The main task of the luminance processing is to remove the colour carrier by means of a notch filter. For PAL and SECAM operation a baseband delay line is used for U and V signals. This can be used as comb filter in NTSC operation (only for chrominance). The RGB input from SCART is used

or Swedish OSD languages are selected, the teletext will be correctly displayed. However, if Polish, Hungarian, Czech, Slovakian, Rumanian or Russian OSD are selected, the consequence will be incorrect teletext display for the national option characters. Romanian national font options will be selected. PRIMARY LANGUAGE English German Scandinavian Italian French Spanish Turkish Greek Polish German Hungarian Italian French Serbian Czech Rumanian English German Estonian Lettish Russian Ukrainian Czech Rumanian
OSD Language English, French, German, Italian, Spanish, Dutch, Danish, Finnish, Norwegian, Swedish, Greek

C12 C13 C1

Secondary Language English German Scandinavian Italian French Spanish Turkish English Polish German Hungarian Italian French Serbian Czech Rumanian Russian German Estonian Lettish English English Czech Rumanian
X26 Language West Euro West Euro West Euro West Euro West Euro West Euro West Euro Greek East Euro West Euro East Euro West Euro West Euro East Euro East Euro East Euro Cyrillic West Euro East Euro East Euro Cyrillic Cyrillic East Euro Cyrillic
Polish, Hungarian, Czech, Slovakian, Rumanian

Bulgarian,

5.6 SOUND PROCESSING 5.6.1 ANALOGUE SOUND IF - INPUT SECTION The input pins ANA_IN1+ and ANA_IN- offer the possibility to connect sound IF sources to the MSP 341xG. The analogue-to-digital conversion of the preselected sound IF signal is done by an A/D converter, whose output is used to control an analogue automatic gain circuit (AGC), providing an optimal level for a wide range of input levels. 5.6.2 QUADRATURE MIXERS The digital input coming from the integrated A/D converter may contain audio information at a frequency range of theoretically 0 to 9 MHz corresponding to the selected standards. By means of two programmable quadrature mixers, two different audio sources ; for example, NICAM and FM-mono, may be shifted into baseband position. 5.6.3 PHASE AND AM DISCRIMINATION The filtered sound IF signals are demodulated by means of the phase and amplitude discriminator block. On the output, the phase and amplitude is available for further processing.
AM signals are derived from the amplitude information, whereas the phase information serves for FM and NICAM demodulation. 5.6.4 NICAM DECODER In case of NICAM - mode, the phase samples are decoded according the DQPSK - coding scheme. The output of this block contains the original NICAM bitstream. 5.6.5 DSP SECTION All audio baseband functions are performed by digital signal processing (DSP). The DSP section controls the source and output selection, and the signals processing. 5.6.6 SOUND MODE SWITCHING In case of NICAM transmission, the controlling software read the bit error rate and the operation mode from the NICAM Decoder. When the set is in Auto detection mode ( default mode after ATSS ) the MSP firmware set automatically the sound mode ( NICAM mono, NICAM Dual 1 or NICAM Dual 2 ) depending on the transmitted mode. In case of 2 Carrier FM transmission, the MSP firmware read the transmission mode and the signal quality level from the Stereo Detection Register. When the set is in Auto detection mode the firmware set automatically the sound mode ( mono, Stereo, Dual 1, Dual 2 ) depending on the transmitted mode. In Auto detection mode the firmware evaluate the signal quality and automatically switch to the analogy sound carrier 1, if the transmission quality is too poor. To avoid unwanted automatic switching the threshold levels mono to stereo and stereo to mono is different.When the sound mode change, the MSP firmware informs the microcontroller by rising pin 4. This generates an interrupt to the controller, which then read MSP registers via I2C bus to know the new sound status, and update OSD when needed.In forced mono mode ( locker icon ), the controlling software configure the MSP341xG to demodulate only the analogue (FM or AM) sound carrier 1, no matter the signal quality. The sound mode forced or Autodetect is stored for each programme. 5.7 SOUND AMPLIFICATION The TDA8944J (TDA8946J) is a stereo BTL audio amplifier capable of delivering 2 x 7 W (2 x 15 W) output power to an 8 load at THD = 10%, using a 12 V power supply and an external heatsink. The voltage gain is fixed at 32dB. With the three-level MODE input the device can be switched from standby to mute and to operating mode. The TDA 8944J outputs are protected by an internal thermal shutdown protection mechanism and short-circuit protection. 5.7.1 POWER AMPLIFIER The power amplifier is a Bridge Tied Load (BTL) amplifier with an all-NPN output stage, capable of delivering a peak output current of 1.5 A. The BTL principle offers the following advantages : - Lower peak value of the supply current. - The ripple frequency on the supply voltage is twice the signal frequency. - No DC-blocking capacitor - Good low frequency performance 5.7.2 MODE SELECTION The TDA894xJ has several functional modes, which can be selected by applying the proper DC voltage to pin MODE.

Mute : In this mode the amplifier is DC biased but not operational (no audio output). This allows the input coupling capacitors to be charged to avoid pop-noise. The devices is in mute mode when 2.5 V < VMODE < (Vcc-1.5 V). Operating : In this mode the amplifier is operating normally. The operating mode is activated at VMODE < 0.5 V. 5.8 VERTICAL DEFLECTION The vertical driver circuit is a bridge configuration. The deflection coil is connected between the output amplifiers, which are driven in phase opposition. The differential input circuit is voltage driven. The input circuit is especially intended for direct connection to driver circuits which deliver symmetrical current signals, but is also suitable for asymmetrical currents. The output current of these devices is converted to voltages at the input pins via resistors R350 and R351. The differential input voltage is compared with the output current through the deflection coils measured as voltage across R302, which provides internal feedback information. The voltage across R302 is proportional to the output current. 5.8.1 FLYBACK VOLTAGE The flyback voltage is determined by an additional supply voltage Vflb. The principle of operation with two supply voltages (class G) makes it possible to fix the supply voltage Vp optimum for the scan voltage and the second supply voltage Vflb optimum for the flyback voltage. Using this method, very high efficiency is achieved. The supply voltage Vflb is almost totally available as flyback voltage across the coil, this being possible due to the absence of a coupling capacitor. 5.8.2 PROTECTION The output circuit has protection circuits for : - Too high die temperature - overvoltage of output stage A 5.8.3 GUARD CIRCUIT The guard signal is not used by the video IC to blank the screen in case of fault condition. 5.8.4 DAMPING RESISTOR For HF loop stability a damping resistor (R331) is connected across the deflection coil. 5.8.5 EAST-WEST AMPLIFIER (TDA8358J ONLY) The East-West amplifier is current driven. It can only sink currents of the diode modulator circuit. A feedback resistor R397 is connected between the input and output of this inverting amplifier in order to convert the East-West correction input into an output voltage. 5.9 POWER SUPPLY (STR F6654) 5.9.1 STR-F6654 GENERAL DESCRIPTION The STR-F6654 is an hybrid IC with a build-in MOSFET and control IC, designed for flyback converter type switch mode power supply applications. 5.9.2 POWER SUPPLY PRIMARY PART OPERATIONS An oscillator generates pulses signals which turn on and off a MOSFET transistor.
5.9.2.1 Start -up Circuit: VIN The start-up circuit is used to start and stop the operation of the control IC, by detecting a voltage appearing at VIN pin (pin 4).

power supply line 130V

IC power supply delivery FBT
Remarks FBT supplies 35V to I301 vertical IC FBT supplies 11V to I301 vertical IC FBT supplies 33V to the tuner FBT supplies 180V to I901 video amplifier pin 6

14.5V 14V 8V 5V

3.3V S/B 5V S/B 3.3V
I602 sound amplifier pins 3-16 T401 H- drive I601 Sound Demod pins 38-39I101 IF IC pin 23 I502 IC pin 47 I601 Sound Demod pins 7-18-57 I702 EEPROM pin 8 Tuner I501 and I502 Main IC pins I703 IR receiver pin 1 I701 pins and I502 pins
5.10.2.2 TV Set On Stand-By Mode 5-10-2-2-1 TV set circuit diagram on stand-by mode

23 2.5V 12 2.5V 3

MICOM 4 3.3V 11 17
5-10-2-2-2 TV set stand-by mode operations On stand-by mode, I701 microcontroller pin 52 (power) is set to low. So, Q809 collector is set to high. Then, I810 controlled rectifier gate pin is set to high and I810 is conducting. So, current flows from pin 16 SMPS transformer to the ground via I804 optocoupler and Q810 and Q811 transistors (which are conducting). In these conditions, I801 delivers pulses on light mode and T801 produces voltages with reduced power. As I810 is conducting, current flows also from pin 16 SMPS transformer to I823 (5V regulator) for I701 com, IR receiver and front mask buttons supply voltage (then, remote control or front mask buttons can be activated to leave stand-by mode).
6. SERVICE PARTS LIST Caution:In this Service Manual, some parts can be changed for imroving, their performance without notice in the parts list. So, If you need the latest parts information, please refer to PPL(Parts Price List)in Service information Center(http://svc.dwe.co.kr) 6.1 DTH-2881FLF-S
14000 ZZ120 M211 M211D M541 M542 ZZ130 M211A M211B M211C M281 M352 M481 M481A M501 M561 M681 M682 M791 P405 PWC1 SP01A SP02A V901 V901A V901B ZZ131 ZZ132 ZZ200 M201 ZZZZ206 CF802 LF200 PF01A PF02A PF02B PF802 RF801 ZZ200 A001 E804 E805 E806 E807 E808 E809 E810 E811 E812 E813 E814 ZZ30

PART CODE

PART NAME
R-46G22 (AAA) AAA R03/NN SUPERGARD L. D. P. E. T0. 05X250X40 DTH-2881FLF-S HIPS GY 28WMM 20 150ART P/E FILM (C/TV) ART 90 DTH-2881FLF-S TT2 TRS 4X16 MFZN BK TT2 WAS 3X12 MFZN BK SWRM+SECC 2823601+NYROLN 66 HIPS GY 2881 14Q1/M3 SWPA PIE0.5 PVC T0.25 (2881/W9) BLACK DAEWOO 28 BLACK NYLON66 DA100 NYLON 6 (V0) LA701 (KIFCO) SE100J+172792+USW=500 CW4232 H03VVH2-F=2250 TT2 TRS 4X12 MFZN TT2 TRS 4X12 MFZN W66ERF022XL=32 DC-28SFW 2801H-1015-2P DTH-2881FLF-S HIPS GY 2881 DTG-28A7FZF 12W 8 OHM SP-58126F YH025-04+35098+ULW=700 12W 8 OHM SP-58126F DTH-28W8FZP 0.47MF 1J(UCVSNDF/SV B82991-S2901-N2 YPW500-02 YPW500-02 YPH500-02+YLT500+USW=300 YFW800-(BC) DTH-28W8FZP CP-810100X50(246X246/1X8) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) BSR T0.2 (R1.6) DTH-2881FLF-S SN:PB=63:37 3PI(NO FLUX) IM-1000 RS 60-1.2 1.6A CF-329D

J417 J418 J419 J420 J423 J426 J427 J429 J430 J431 J432 J433 J434 J435 J440 J450 J453 J460 J483 J488 J889 L105 L153 L402 L506 L507 L524 L551 L568 L601 L602 L603 L605 L650 L709 L711 L713 L730 L737 L742 L744 L801 LA01 LA02 LA03 LA04 LA06 LA07 LA08 LA09 R103 R110 R111 R150 R151 R152 R154 R155 R162 R163 R164 R190 R191 R301 R310 R311 R333 R334
85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 85801065GY 5CPZ479K02 5CPZ120K02 5MC0000100 5CPZ479K04 5CPZ100K02 5CPZ100K02 5CPZ479K04 5CPZ100K02 5CPZ479K02 5CPZ100K02 5CPZ479K02 5CPZ479K02 5MC0000100 5CPZ100K02 5CPZ100K02 5CPZ100K02 5CPZ100K02 5CPZ100K02 5CPZ100K02 5CPZ100K02 5MC0000100 5CPZ100K04 5CPZ100K04 5CPZ100K04 5CPZ100K04 5CPZ100K04 5CPZ100K04 5CPZ100K04 5CPZ100K04 RD-AZ123JRN-4Z1502F RD-AZ133JRD-AZ561JRD-AZ102JRD-AZ271JRD-AZ470JRD-AZ751JRD-AZ153JRD-AZ752JRD-AZ752JRD-AZ221JRD-AZ331JRD-4Z472JRD-AZ432JRD-AZ432JRD-AZ222JRD-AZ222J-
WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER WIRE COPPER COIL PEAKING COIL PEAKING COIL BEAD COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL BEAD COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL BEAD COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING COIL PEAKING R CARBON FILM R METAL FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM R CARBON FILM
AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING 4.7UH 3.5MM K (LAL02TB) 12UH 3.5MM K (LAL02TB) MD-5 (HC-3550) 4.7UH 10.5MM K (LAL04TB) 10UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) 4.7UH 10.5MM K (LAL04TB) 10UH 3.5MM K (LAL02TB) 4.7UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) 4.7UH 3.5MM K (LAL02TB) 4.7UH 3.5MM K (LAL02TB) MD-5 (HC-3550) 10UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) 10UH 3.5MM K (LAL02TB) MD-5 (HC-3550) 10UH 10.5MM K (LAL04TB) 10UH 10.5MM K (LAL04TB) 10UH 10.5MM K (LAL04TB) 10UH 10.5MM K (LAL04TB) 10UH 10.5MM K (LAL04TB) 10UH 10.5MM K (LAL04TB) 10UH 10.5MM K (LAL04TB) 10UH 10.5MM K (LAL04TB) 1/6 12K OHM J 1/4 15K OHM F 1/6 13K OHM J 1/OHM J 1/6 1K OHM J 1/OHM J 1/OHM J 1/OHM J 1/6 15K OHM J 1/6 7.5K OHM J 1/6 7.5K OHM J 1/OHM J 1/OHM J 1/4 4.7K OHM J 1/6 4.3K OHM J 1/6 4.3K OHM J 1/6 2.2K OHM J 1/6 2.2K OHM J

C415 C416 C417 C418 C604 C805 C811 C812 C813 C814 C820 C823 C832 C840 C841 C845 C861 C866 C871 D404 D404A D404B D820 D860 F801 I101 I301 I301A I301B I601 I602 I602A I602B I701 I702 I703 I801 I801A I801B I804 I806 I810 I820 I821 I822 I823 I824 I826 I827 JP01 JPA1 JPA2 JPA3 JPA4 L150 L380 L381 L401 L403 LF801 M351 M791 P401 P402 P501 P601 P801 PF01
CEXF2E100V CCYR3D471K CMYE2G103J CEYD1H689W CEXF1E102V CEYN2G181P CCYR3D221K CH1BFE472M CEXF2E101V CEYF2E470V CCYR3A471K CEXF1E102V CEXF1E102V CEXF1C332V CEXF1C222V CEXF1E102V CEXF1E102C CCYR3A471K CEXF1E102V DFMP3FUDBYW76 DBYW76 5FSCB4022R 1TDA4470M1TDA8358J1MSP3411V3 1TDA8946J1SDA555XFL 1AT24C16PC 1TS0P1238W 1STRF1KP1010C 1DP130 TX0202DA 1L7805CV 1LD1117V33 1L7808CV 1LD1117V50 1LD1117V18 1LD1117V33 1LD1117V58E0000041 58C0000120 58C0000120 58H0000054 58C0000118 5PLF24A4857913304 4850705S4850708N4859287320 4859238620
C ELECTRO C CERA C MYLAR C ELECTRO C ELECTRO C ELECTRO C CERA C CERA AC C ELECTRO C ELECTRO C CERA C ELECTRO C ELECTRO C ELECTRO C ELECTRO C ELECTRO C ELECTRO C CERA C ELECTRO DIODE HEAT SINK SCREW TAPPTITE DIODE DIODE FUSE CERA IC IF IC VERTICAL HEAT SINK SCREW TAPPTITE IC SOUND IC AUDIO HEAT SINK SCREW TAPPTITE IC MICOM OTP IC MEMORY IC PREAMP IC SMPS HEAT SINK SCREW TAPPTITE IC PHOTO COUPLER IC ERROR AMP THYRISTOR IC REGULATOR IC REGULATOR IC REGULATOR IC REGULATOR IC REGULATOR IC REGULATOR IC REGULATOR JACK EARPHONE SOCKET RGB SOCKET RGB JACK PIN BOARD SVHS JACK COIL AFT COIL CHOKE COIL CHOKE COIL H-LINEARITY COIL CHOKE FILTER LINE HOLDER LED AS RUBBER CUSHION CONN AS CONN WAFER CONNECTOR CONN WAFER CONN WAFER CONN WAFER
250V RSS 10MF (10X20) TP HIKR 2KV 470PF K 125C 400V PU 0.01MF J 50V RHD 6.8MF (16X35.5) 25V RSS 1000MF (13X20) TP 400V LHS 180MF (25X35) 2KV R 220PF K 125C AC400V 4700PF M U/C/V 250V RSS 100MF 18X35.5 250V RSS 47MF (16X25 1KV 470PF K 125C 25V RSS 1000MF (13X20) TP 25V RSS 1000MF (13X20) TP 16V RSS 3300MF 16V RSS 2200MF(13X25)TP 25V RSS 1000MF (13X20) TP 25V RUS 1000MF 13X20 TP 1KV 470PF K 125C 25V RSS 1000MF (13X20) TP FMP3FU AL EX BK TT2 RND 3X8 MFZN BYW76 BYW76 SEMKO F4AH 4A 250V MF51 TDA4470-M TDA8358J AL EX ANODIZING TT2 RND 3X10 MFZN MSP3411G-PP-B8-V3 TDA8946J AL EX NO ANODOZING TT2 RND 3X10 MFZN SDA555XFL AT24C16-10PC TSOP1238WI1 STR-F6654 AL EX NO ANODIZING TT2 RND 3X8 MFZN KP-1010C DP130 X0202DA L7805CV LD1117AV33 3.3V TO-220 L7808CV LD1117AV50 5.0V TO-220 LD1117AV18 1.8V TO-220 LD1117AV33 3.3V TO-220 LD1117AV25 2.5V TO-220 YSC-1537 SR-21A1 (ANGLE TYPE) SR-21A1 (ANGLE TYPE) YSC03P-4120-14A PH-SJ-9505A TRF-A005 CH-100Q CH-100Q TRL-040F CH-191A LF-24A1 LH-3P FR RUBBER SPONGE YH025-05+YST025+ULW=400 YFW800-04 YH025-08+YBNH250+USW=600 YW025-04 MKS2822 (LOMAX NEW TYPE) YPW500-02