Tv Lcd Projection

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Service ManualLCD PROJECTION TV

(HDTV MONITOR)

CHASSIS : SJ-210

Model : DSJ-6000LN

S/M No. : DSJ210BEF0

Nov. 2002

DAEWOO ELECTRONICS Corp.

http : //svc.dwe.co.kr


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1. Safety precautions 2

2. Product specification 4

3. Remocon specification 5

4. Adjustment 7

5. Circuit Manual 11

6. Trouble shooting 27

7. Block diagram 35

8. Exploded View 36

9. Connection diagram 37


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Safety precautionsGRAPHIC SYMBOLS :The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the service

personnel to the presence of uninsu-lated" dangerous voltage" that may be of suffi-cienty magnitude to

constitute a risk of electric shock.

The exclamation point within an equilateral tri-angle is intended to alert the service personnel to the

presence of important safety information in service literature.

Fuse symbol is printed on pcb adjacent to the fuse, with " RISK OF FIRE REPLACE FUSE AS

MARKED". The symbol is explained in the ser-vice manual with the following wording or equiv-alent

CAUTION : FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH SAMETYPE (6.3A, 125V)" and

" ATTENTION: AFIN D ASSU UNE PROTECTION PERMANENTE CONTRE LES RISQUES D INCENDIE,

REMPLACER UNIQUE-MENT PAR UN FUSIBLE DE MEME TYPE ET DE " 6.3A, 125V" .

SUBJECT : TIPS ON PROPER INSTALLATION

1. Never install any receiver in closed-in recess, cubbyhole or Closely fitting shelf space over, or close to heat duct,

or in the path of heated air flow.2. Avoid conditions of high humidity such as : Outdoor patio Installations where dew is a factor. Near steam radiators

where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct rear venting. The customer should also avoid the use of decorative

scarves or other coverings which might obstruct ventilation.

4. Wall and shelf mounted installations using a commercial mounting kit, must follow the factory approved mounting

instructions. A receiver mounted to a shelf or platform must retain its original feet (or the equivalent thickness in

spacers) to provide adequate are flow across the bottom, bolts or screws used for fasteners must not touch and

parts or wiring. Perform leakage test on customized installations.

5. Caution customers against the mounting of a receiver on sloping shelf or a tilted position, unless the receiver is

properly secured.

6. A receiver on a roll-about cart should be stable on its mounting to the cart. Caution the customer on the hazards oftrying to roll a cart with small casters across thresholds or deep pile carpets.

7. Caution customers against the use of a cart or stand which has not been listed by underwriters laboratories, inc.

For use with their specific model of television receiver or generically approved for use with T.V. s of the same or

larger screen size.

Caution for servicingWhen the general troubles happen, Remove the back cover of the TV set. But , however if the components (the Air

filter, Lamp, Lamp detect switch, or LCD Engine driver PCB, etc) in the front of TV set is out of order, Remove the

speaker grill and the front panel of the TV set.

Specially, First you have to plug out socket , for exchanging the Fuse of TV set,.

When Lamp driver is operated, the high voltage(13~20kV) is generated from the Lamp. Therefore the person only

who has the enough knowledge for the high voltage must handle it with care.


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KEY Button and Function

KEY BUTTON FUNCTION

Remote controller Green - TV in use

Lamp Orange - VCR in use

Red - CATV in use

POWER Use turning on, turning off TV

TV/VCR/CATV TV / Video / Cable Converter

Use to select Use to select channel directly 0~9

channel directly

100 Button Use it when selecting a channel number of over 100RECALL It displays currently watching TV channel and its input signal.

VCR Function REW, PLAY, FF, STOP, REC, PAUSE.

MENU Use it to make picture adjustment, screen format, sound adjustment, input

selection, and utilities.

TV/ VIDEO Use this function to make video input selection.

It changes in the fallowing sequence

TV VIDEO 1 VIDOE 2 VIDEO 3 DVD TV

PC/DTV PC DTV can be selected alternately.

Use it when selecting either PC or DTV.Channel/ Volume Use this function to select the channel / to adjust the volume.

PREV It returns to previous channel.

MUTE Use to mute.

SCREEN MODE This feature converts the screen mode each time you press the button

from Normal Bright Soft User

SCREEN SIZE This feature converts the screen size by changing its aspect ratio. Each

time you press the button, it will be change from

Normal Wide Panorama Enlarge(LB) Enlarge(LBS)

DOLBY SOUND This button allows you to choose one of the Pro-logic modes.

Normal Off 3-stereo Wide

SOUND MODE This feature allows you to choose the mode, Each time the button is pressed,

it rotates from Normal Music Movie News User

ADD/ERASE This feature either momorizes the current channel or erases a channel that

has previously memorized.

CAPTION This feature allows you choose the caption. Each time the button is pressed it

rotates from CC1 CC2 CC3 CC4 off

SLEEP This feature is use to set up the time out of automatic turn off..

MTS This feature allows you to select the language while broadcasting.

TV/CATV This button allows you to select the broadcasting alternately.


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4-1. Adjustment in Production

1) How to Fix Engine.

You measure the range of screen s shifting after assembling set.

But, in case of the range is over spec ( H : 7mm, V: 3mm, Tilt : 2mm), adjust again in Local CH 8(RETMA) of

the factory.

2) Adjustment H/V Position.

You select PC Mode to receive reference signal of VG-828 (Program #. 954 : 720p Pattern. 990 : Display

Position Pattern)

Note : LCD Panel is 720p.

You can adjust screen size and position in operating User Menu ( Horizontal Size & Position, Vertical Size &

Position).

3) White balance adjustment

Input the signal of VG-828 (Program #. 946(NTSC) White Window Pattern.(20 20)) to Video 1.

Confirm the initial data of PW364 Mode in SVC Menu.

Adjust the White Balance changing R/G/B Gain after setting signal level 100IRE( 255).

How to adjust temperature of color. : X = 0.265 0.01 0.270 0.01.

You can set Luminance level .

Adjust the White Balance changing R/G/B Bias after setting signal level 40IRE( 102).

Input the signal of VG-828 (Program #. 972(1080i) White Window Pattern.(20 20)) to DTV.Adjust the White Balance changing AD9884 s Register Value(CXA1315A, CXA1315B, CXA1315C) after

setting signal level 40IRE( 102).

Adjust the White Balance changing CXA2101 s Register Value(R-Drive, G-Drive, B-Drive) after setting

signal level 40 IRE( 102).

Confirm the range of White Balance being in limit and measure Luminance value

Set all adjustment after about 5 Min s heatruning

Note : Lamp wattage converted automatically from 160W to 130W after 3 min.

Heatrun must be operated after inputing White_Pattern, (no concerned No Signal)

Note : You select White_Pattern in Test Pattern of SVC Menu.

You select Screen Size is Wide and Screen Mode is Normal.


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4-2. SERVICE MODE

To operate Service : Press the USER Remote controller in order starting with CH Up Mute RECALL

Mute (You can operate in case INPUT is TV mode, or being input signal)

Service Mode

* PW364 (Adjusting Brightness Contrast and White Balance of full Iinput)

Item Initial Value Description

S Bright 64 Screen Brightness Fixing Value

S Contrast 64 Screen Contrast Fixing Value

R Bias 63 Red Color of Low level signal Adjusting Value

G Bias 63 Green Color of Low level signal Adjusting ValueB Bias 63 Blue Color of Low level signal Adjusting Value

R Gain 63 Red Color of Low High signal Adjusting Value

G Gain 63 Green Color of Low High signal Adjusting Value

B Gain 63 Blue Color of Low High signal Adjusting Value

SVC MAIN (Initial Data of the Service mode)

PW364 (Adjusting Brightness Contrast and White Balance of full input)

AD9884 (Adjusting Brightness Contrast of DTV/ PC input)

CXA2101 (Adjusting Brightness Contrast and White Balance of DTV input)

VPC3230 (Adjusting Brightness Contrast of TV / VIDEO/DVD input)

Test Pattern (Displaying in order R G B W BLK

Lamp Watt (Adjusting Lamp Wattage 160W or 130W)

ENG Control (Adjusting LCD ENGINE UNIT)

Use Time (Total usage time of LCD panel)

Factory Set (operating Initalization)

DSJ6000LW200209181500 (Model name, micom version)


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AD9884 (Adjusting Brightness Contrast of DTV/ PC input )

CXA2101 (Adjusting Brightness Contrast and White Balance of DTV input)

R Gain 148 Fixing Value RED MIN 148G Gain 148 Fixing Value RED MAX 148 Reading velue

B Gain 148 Fixing Value GRN MIN 148 automatirally

CLP PL 4 Fixing Value GRN MAX 148 accorling to

CLP DR 4 Fixing Value BLU MIN 148 adjustment state

Phase 15 Fixing Value BLU MAX 148

ITEM Initial Value Description

CXA1315A 42 Adjusting Red Color of Low level signal Adjusting Value

CXA1315B 40 Adjusting Green Color of Low levelsignal Adjusting Value

CXA1315C 40 Adjusting Blue Color of Low level signal Adjusting Value

ITEM Initial Value Description

Picture 63 Contrast Fixing Value

Bright 8 Brightness Adjusting Value

R Drive 22 Adjusting Red Color of High level signal Adjusting Value

G Drive 18 Adjusting Green Color of high levelsignal Adjusting Value

B Drive 16 Adjusting Blue Color of high level signal Adjusting Value

BLK BTM 15 Fixing Value

VPC3230 (Adjusting Brightness Contrast of TV / VIDEO / DVD input)

ITEM Initial Value

Sub Bright 0 Adjusting Value

Sub Contrast 20 Adjusting Value

Test Pattern

R => G => B => W => BLK

Lamp Watt (160W is 25% brighter than 130W but lifetime of Lamp is shorter)

160W

130W

ENG Control (Adjusting LCD ENGINE UNIT )

GAMMA (NORMAL, Natural1, Natural2) : NORMAL(NO GAMMA compensation ),

NATURAL1=NATURAL2

ROTATION Scren Rotation (0, 90, 180, 270)

COLOR Screen s color compensationsub CPU sub CPU s initalization in Engine Unit


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1. Specification / Feature1-1. Product Specification

1-2. Product Feature

1-3. General Block Diagram

2. Power Supply

2-1. Summery2-2. Block Diagram

2-3. Power structure

2-4. Power Action manual

3. Sound & Audio Amp3-1. Summery

3-2. I/O Specification

3-3. Block Diagram

3-4. Action Manual

4. Video4-1. Summery

4-2. Block Diiagram

4-3. Video Circuit Manual

4-4. *IF and Video Manual

5. Engine Drive5-1. Summery

5-2. Block Diagram

5-3. Action Manual


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1.Specification / Feature

1-1.Product Specification


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1-2.Product Feature

TV Turn on/ off : The Lamp featureWhen the main power lamp flickers on green, the screen will gradually turn on. During this instance, the power

button will not operate. When the process is completed, the main power lamp lights on green.

It is LCD-Projection TV characteristics that it takes a little while for the video to be displayed on the screen

when it is turned on. This is not malfunctioning; thus, please be patient and wait for a moment.

The degree of brightness will decrease insignificantly after 3 minutes is passed. This is not a breakdown; it is

only using a power saving process to maximize the lamp s lifetime. (Lamp watt : 160W -> 130W)

When the power buttons are pressed, the main power lamp may flicker in green, but the secondary power lamp

may flicker in red and orange alternately. In this case, the TV s main power has been erroneously pressed, or

has been turned off improperly by a power stoppage or by any other reason. However, please wait for an

instant, and the TV will be back on (the latest 1min. 30sec.) since this is not a malfunctioning of the product.

Turning off the TV set.

Press the power button on the remote controller or that of the TV set. Audio and Video will be turned off and

the main power lamp will flash. In green at this time. This is not malfunctioning nor an error; it is just a process

of cooling the lamp off. During this time, the power button will not operate. A red light will light up after a

minute.

1-3. General Block Diagram


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2. Power Supply

2-1. Introduction

The POWER PCB is composed of 140W Power for 60 LCD PTV(DSJ-6000LN) as well as

the Power that makes 380V and 18V primary voltage for Ballast.

2-2. Block Diagram(attach)

2-3. Power Supply Component

(1) Input Power : 100V ~ 240VAC, 50/60Hz

(2) Consumption Power : 270W

(3) Power Supply for the secondary side : See the table below.

No. location voltage Function Current remarks

1 T802 D5V Main and Video/Engine Power 1,000mA F/B Line

2 T802 33V Tuning B+ 3mA

3 T802 A5V Main and Video Power 1,000mA

4 T802 12V Main and Video Power 300mA

5 T802 9V Main and Video Power 80mA

6 T802 18V Ballast and PFC Control Power 150mA Primary

7 L805 380V Ballast Power 470mA Primary

8 T802 17.5V Engine Power 300mA

9 T803 7V/10V Engine Fan Power 1,000mA 10V (more than 45 degree

of Engine temperature

10 T803 +15V Audio Power 3,000mA

11 T803 -15V Audio Power 3,000mA

12 T801 ST5V Stand-By Power 600mA

2-4. Description of Operation

(1)Power Supply and Stand-by Power

(1-1) The voltage coming through Bipolar Power Code (PC801) passes through the

Line Filter composed of EMI Filter (L801, L802), X-Capacitor (C801, C803,

C806), and Y-Capacitor (C822, C823) and is rectified and smoothed in the Bridge

Diode (D803, D806, D831, D832) through the Mimetal that is the P303E

Temperature Sensor (Power OFF when Lamp Temperature 125 ~ 135).

(1-2) The smoothed voltage is supplied to the TOP232P that is STAND-BY POWER

IC(1804), and the TRANS secondary winding supplies STAND-BY Power (5V)

for U-COM.


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(2) MAIN Power Operation

(2-1) PWR SWITCH ON(HIGH) Signal is supplied from U-COM to the Base of Q804 viaP805M CONNECTOR, Positive Terminal Relay(Y801) is activated, then Starting

Voltage is supplied to the No.4 pin (Vin) of STR-F6656(IC802, IC803) via R836 and

R844.

(2-2) AC Power is rectified in the Bridge Diode(D801), and is applied to P winding of the

TRANS, and reaches 16V of TRANS Auxiliary Winding (No.7 pin), then Control

Circuit is active by the operation of Start Circuit.

(2-3) The winding voltage of the Auxiliary Winding (No.6 pin) is rectified, 18 V is upplied

to 1601(FA5332M) No. 3/16 pins, and the phase of Voltage/Current is compensated,

No.13 Pin Reference Voltage/No. 15 Pin OSC Timing C/R oscillates internally, and

mixed to AND Gate, passes to No.13 pin, and its voltage is elevated to DC380V

from L805 by FET Switching via Debias Stabilization Circuit (Q801/802). The

elevated 380V

is smoothed through Diode(D802), and is supplied to the Ballast via P804B.

(3) Specification of STR-F6656

STR-F6656 is the Hybrid IC for the power of Flyback Converter-type Switching where

Power MOSFET and IC for Control is installed. The characteristics of this IC are parts to

be added are just a few, and various protection functions such as Transient Current

Protection, Transient Voltage Protection, Overheat Protection), and has the Quasi-Resonance function proper for miniaturization and standardization.

The detailed specifications of this IC is as follows.

Pin Number Symbol Name Function

1 OCP/F.B OCP/F.B OCP detection input and Feed Back

2 S Source MOS FET Source

3 D Drain MOS FET Drain

4 Vin Vin Control circuit voltage Input

5 GND GND Ground

Symbol Function

OVP Over voltage protect

TSD Over temperature protect


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(3-1) Power Supply for Vin

When Vin Terminal (No.4 pin) voltage that is charged to C821, C830 through the Starting

Resistance reaches 16V(Typ), the Control Circuit inside the F6656 starts to operate. Here,

the Circuit Current is limited to 100 A(MAX) before F6656 operates, so the high Starting

Resistance (47K ,2W) is used. After F6656 operated, the voltage coming out of D

winding of TRANS (T802, T803) is rectified and smoothed, supplying the stable voltage

to the Vin terminal. Here, dl winding is rectified and smoothed via D812, D816, C821,

and C830, and about 16V is supplied to the Vin terminal (No.4 pin) of F6656.

(3-2) OCP/F.B Terminal (Oscillator, Electrostatic Voltage Control Circuit)

Inside the F6656, there is the Oscillator that generates Pulse signal for controlling

electrostatic voltage in the secondary side by turning ON/OFF the MOSFET using the

charging/discharging of C . When AC input is high or Load Current is low, the inflow of

the current of F/B terminal increases, and ON time decreases. The Oscillator has the

Transient Current Protection Circuit (O.C.P. circuit) of Pulse by Pulse type that controls

the oscillator s output by detecting MOSFET Drain current s peak value per every pulse.

(3-3) D/S Terminal (Driver Circuit)

This Circuit is the circuit that charges/discharges the capacity between Gate-Sources of

Power MOSFET by receiving Pulse signal.

(3-4) Latch Circuit

This Circuit is the circuit that stops Power Circuit by keeping the output of the Oscillator

to LOW when the Over Voltage Protection Circuit (OVP) and Overheat Protection Circuit

(TSD) operate. The Sustaining Current of the Latch Circuit is 400 A(MAX) when Vin

terminal voltage is 8.5V, so if the current over 400 A is made to flow to the Vin terminal,

the Power Circuit keeps normal. This circuit activates the Latch Circuit only when OVP,

TSD Circuit operates or when external signal input is kept over 10 sec, by setting the

delay time in accordance with C inside F6656 in order to prevent erroneous operation

due to Noise, etc. Besides, even though Latch Circuit operates, it is operated inelectrostatic power circuit in the Control Circuit so the Circuit Current gets elevated,

decreasing the Vin terminal voltage dramatically. When Vin terminal voltage gets below

Termination Voltage (10V TYP), the Circuit Current increases again, so Vin terminal

oltage decreases. That is, Vin terminal voltage increases or decreases between 10V and 6V

when Latch Circuit operates, it is possible to prevent Vin terminal voltage rising

bnormally. To cancel the Latch Circuit, Vin terminal voltage should be decreased to below

6.5V. Generally, it can be cancelled by turning off the AC power.

(3-5) Overheat Protection Circuit (TSD)

This Circuit is the circuit that operates the Latch Circuit when the Frame

temperature exceeds 150 degrees (TYP). In this circuit, the real temperature detection is


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carried out in the Control System, but MOSFET as well as Control Circuit element is on

the Frame, so the circuit operates same for the overheat of MOSFET.

(3-6) Transient Voltage Protection Circuit (OVP)

This Circuit is the circuit that operates the Latch Circuit when the Vin terminal voltage

exceeds 22V (TYP). Basically, this circuit protects Transient Voltage, but the Vin

erminal is supplied from the TRANS Auxiliary Winding, and this voltage is roportional

to the output voltage, so it operates when the secondary side out is transient voltage such

as when Control Circuit is open.


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Partition NAME DESCRIPTION

SIF SIF Signal from TV TUNER

Sound NTSC L/R The Selected Audio signal of 3 input Video

INPUT DVD L/R, DTV L/R The Audio signal of the DVD & DTV

PC L/R The Audio signal of the PC

I2C SCL, SDA The controlling I2C signal of SOUND IC & DOLBY IC

MAIN L/R The Audio signal L/R

C The Audio signal Center

Sound W The Audio signal Woofer

SL/SR The Audio signal SURROUND L/R

HP L/R The Audio signal HEAD_PHONE

MON L/R The Audio signal MONITOROUTPUT

VOL L/R Volume control L/R SPEAKER

VOL C Volume control CENTER SPEAKER

Control VOL W Volume control WOOFER SPEAKER

VOL SL/SR Volume control SURROUND L/R SPEAKER

A_MUTE AUDIO MUTE

3. Sound & Audio Amp3-1. Introduction

Sound Processor is composed of Switching that selects signal proper to the Select Mode among

Sound Signal of the Video Input (SIF, DVD, Input 1/2/3) and the Sound Signal of Graphic

(DTV, PC); and Signal Processor that generates Sound Signal (C, W, SL, SR) which is Dolby

decoded through MAIN L/R Sound Signal and IIC(SCL/SDA) Interface. Besides, it is composed

of Amplifier that amplifies the signal generated by Volume Control Block to the sound signal

proper for speaker capacity.

3-2. I/O Description

(1) Sound Processor


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3-4. Description of Operation

Sound Processor is composed of Switching that selects signal proper to the Select Mode

mong Sound Signal of the Video Input (SIF, DVD, Input 1/2/3) and the Sound Signal ofGraphic (DTV, PC); and Signal Processor that generates Dolby Prologic Sound Signal via

Sound DSP. In the VIDEO the SIF signal is received from TUNER in MSP3440G (SOUND

PROCESSOR IC) generates sound signal L/R. Besides, Among the Sound Signal (NTSC

L/R: VIDEO_1/2/3 Sound Signal L/R selected from the TUNER Sound Signal L/R,

CXA1855 (VIDEO SWITCHING IC), and DVD Sound Signal, a proper sound signal is

selected, then it is outputted to MAIN L/R. In the GRAPHIC, a proper signal is selected in

DPL3519A among the sound signal of DTV and PC, and outputs to MSP3440G, so MAIN

L/R can be selected. Also, D/A converted Sound Digital signal is generated to SERIAL

ATA(IS2_DA, 12S_CL, 12S_WS, I2S_OUT), so Central Sound signal (C) which is DOLBY

PROLOGIC Sound Signal, Woofer Sound Signal (W), and Surround Sound signal(SL/SR) is

generated.

Partition NAME DESCRIPTION

INPUT SOUND PROCESSOR Audio signal (the excepted HP L/R, MON L/R)

L/R Output L/R SPEAKER

OUTPUTC Output CENTER SPEAKER

W Output WOOFER SPEAKER

SL/SR Output SURROUND L/R

3-3. Block Diagram


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4. Video

4.1 Introduction

The VIDEO Signal Processing Circuit of DSJ-6000LN converts PC signal(VGA~UXGA),

DTV signal (Y, Pb, Pr 1080i, 720P, 480P@60Hz), DVD signal (Y, Cb, Cr@60 Hz), Y/C

signal (60 Hz) as well as Image Processor PW364, to HD Video signal (1280 x 720 :

Progressive) proper to LCD Projection TV device of this appliance type. It is composed of

Video Processor, Digital TV Processor, Graphic Video Processor, Image Resizing Part

(PW364), LVDS Output, CPU Circuit for System Control.

4-2. Block Diagram

4-3. Circuit Manual

(1) Video Processor Circuit

Video Processor receives Video signal whose Y/C Color Difference is separated, then

converts A/D in VPC3230 that is Video Decoder, and processes Component Video Signal

(Y/UV), and converts the Interlaced Video signal received from Line Doubler SDA9400 to

Progress Video signal. Also, DVD signal that is entered in Component Video signal enters

to another terminal, and processed likewise.


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(2) Digital TV Signal Processor Circuit

The Digital TV signal entering to the Component type is processed in CXA2101A that is IC

for processing TV Video Signal, and is outputted to Analog RGB signal, then is switched

according to the RGB signal of OC.

(3) Graphic Video Signal Processor Circuit

The RGB signal selected in the Digital TV signal and PC signal is converted to two channel

48bit digital RGB signal in AD9884D which is high speed A/D converter.

(4) Image Resizing Circuit

The Digital Video signal and Digital Graphic signal that enter to PW364 from the previous

part are selected, and Image Resizing is done that converts those signals in the proper form,then the signal is outputted in 24bit RGB signal.

(5) LVDS Output Circuit

The Video signal and Synchronizing signal (H,V sync) converted to the display format of this

appliance system is converted to LVDS signal in the TH63LVDM83A that is the LVDS

Transmitter in order to transfer to LCD Engine.

(6) System Control Circuit

This system is composed of two U-COM, and the overall system control is done in the Main

U-COM, the signal is sent that controls all IC except Engine Block, and the System Control

controls regarding image resizing, and process the key entered from the Front Key, then

controls the front-display LED.

4-4. IF Circuit & Video Circuit Structure

This IF Circuit and Video Circuit receives NTSC broadcasting signal and its corresponding

external video signal, DVD, DTV, PC signal via I set of Antenna Input in the terminal board and

6 set of external video jacks including 3 set of NTSC video jacks, then video processing is done

properly.

(1)IF Circuit

IF Signal Processing is as follows.

(1-1) NTSC TV RF Signal received from the Antenna Input of the Terminal Board enters to

TUNER (TU601).

5V, 9V : TUNER Main Power

33V : Voltage for Tuning (Vt Voltage)

(1-2) A desired broadcasting channel is selected from the TV broadcasting signal selected byRemote Control or Switch in such a way that the data

sent from pins of SDA and SCL of -COM are routed to Pin 4 and 5 of DATA/CLK of


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TUNER, and those data are converted to TUNER (IF) signal in the PLL inside the Tuner and

Tuner IC.

(1-3) The carrier of the selected broadcasting signal is converted to PIP frequency (P:

45.75MHz, S: 41.25MHz, C: 42.17MHz), and modulated to IF signal of TU. The

modulated IF signals are converted to Composite Video and SIF signal in the internal IF

Module, then are sent to each Video_Out Port(#16) and Audio_Out Port (#13).

(2) NTSC Video Signal Switching Circuit

Signal Processing of Video Signal Switching Circuit is as follows.

(2-1) In the case of NTSC ANT Input, the Composite Video Signal sent from Tuner

Video_Out Port (#16) is sent to TV Pin 41 of Video Switching IC CXA1855(U101) via

Tr Buffer(Q101), and 3 set of external Video Jack Input 1, 2, 3 are, respectively, sent to

Switching 1,2,3 Input Port of CXA1855.

(2-2) The 4 set of NTSC Video signal sent to CXA1855 is switched to the inside and is

outputted in the Video_Out 2 terminal. At this time, one of the Composite signal

coming from Vout Pin 23 and Yout2, Cout2 Pin (19, 21) is selected via Switching IC

MM1232(U104).

(2-3) The selected Composite or Y/C signal is sent to 3D Comb Filter IC uPD4082(U105) viaFilter, and is processed. This IC is three dimensional Y/C Separate IC, and has the

external AD Converter and 4M bit EDO Memory, and process Y/C separation and

YCNR (YC Noise Reduction) when Composite and Y/C signals are coming.

(2-4) The Y/C signal processed in D Module is routed to Video Board via TR Buffer (Q106,

Q107), respectively.

(2-5) In the case of Monitor Out, 3D Module Input Composite signal and 3D Module Output

Y/C signal are outputted via Buffer (Q102, U102, U103).

(3) DVD, HDTV, PC SIGNAL PROCESSING Circuit

Input of DVD, DTV, and PC signals are sent to A/V Board and Side Board Jacks, then sent to

Video Board directly.


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5. Engine Drive5.1 Introduction

The Engine Drive Signal Processing Circuit of this DSJ-600LN is the circuit for

generating and supplying Video Signal and Driving Signal to activate 3 LCD Panels. It is

composed of RGB Video Processing, Panel Driving Signal Generating, and Panel

Auxiliary Signal Generating sectors.

5.2 Description of Operation

5-3. Circuit Manual(1) RGB Video Signal Processing Circuit

RGB 10 bit of Digital Video signal (3.3 Vpp) processed by G/A for LCD Panel and

IC(SLA550TH) for compensating Unit is outputted along the LCD Panel connected to LCD

driving board in such a way that 10 bit digital data are converted to the Video Signal for

driving LCD of 2x6 channel their levels are adjusted (10.0Vpp; 2.0V~12.0V) by Serial D/A

Converting IC(M62393).

(2) Panel Driving Signal Generating Circuit

The Panel Driving Timing Signal (3.3Vpp) developed from IC(SLA550TH) for processing

Panel Signal is supplied to the LCD Panel by Level Shifter IC (ET1030F0A) by doing level

shift to Level(15.5Vpp) necessary for driving the Shift Register inside the LCD Panel.


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(3) Panel Auxiliary Signal Generating CircuitThe Panel Driving Auxiliary Signal developed from IC(SLA550TH) for processing Panel

Signal is supplied to Panel through 4 each composite Transistor(XN4051) by doing level shift

to the Level(10.0Vpp; 2.5V~ 7.5V) necessary for free-charging the Video Line inside the

Panel by the Level Shifter IC(ET1030F0A).


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No Power On(Timer on/off and the main

power lamp lighting in red)

Check fixing state of air filter

(Power On after removing air filter and

pressing Detect S/W by hand or tape)

Check Fixing state of lamp Door side

(After pulling up Door side, Power On

when pressing Detect S/W on the left

side of engine by hand or tape)

Check whether Sensor (DETECT S/W)is

wrong or not, and fix air filter correctly

After checking Detect S/W is wrong or

not, pull down and fix Door slide

correctly

Replace VIDEO PCB ASSY

Replace POWER PCB ASSY

Check voltage of pin 14 (PWR-CTL) inP612V at Main PCB

Check voltage of pin 1 (PWR) in P605 at

Main PCB

When turning set on, the voltage is more

than 1V in a short time, then it goes to 0V

Check whether all 4 Pins in P619L and

P621L at Main PCB are short

Replace CONNECTOR

OK

OK

0V

0V

Contact badness of P619L, P621L CONNECTOR

NG

NG


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No Power On(Timer on/off and the main power lamp

lighting in orange)

Check if Engine Fan acts for a moment and stops

(Check if air blows to center ventilation hole on

backside of product)

Check voltage of pin 7(7V/10V)

in P806M at Power PCB

Replace Power PCB

Check Short between output

voltages at Power PCB and GND

Replace

LCD ENGINE

Replace

SHORT PCB

Replace MAIN PCB Replace VIDEO PCB

Contact badness

of Connector

Check voltage of pin 5 (ID_1)

in P626C at Main PCB

Check voltage of pin 3 (32Pin) in P612V

at Main PCB

Remove Engine Unit, Check if its

short between pin 3 (Red wire) in

P922E at interior PCB (1x3cm) inEugire and Pin 5 in P626C at main

PCB

The voltage is maneThen DC 5V in a shortTime, then it goes to 0V

POWER ON

NO

0VMore than 0.5V

NO SHORT

SHORT

NO YES

Less than 2V More than 2V

0V


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- 30 -

No Power On(The main power lamp is

not red)

If DRAIN and SOURCE Impedance value approach

0 ohm, replace I804 because it is broken

The main power lamp is not red

FUSE CHECK

I821 CHECK

(POTO COUPLER CHECK)

Check if ST5V is correct.

When pressing Power button, check if

The main power lamp is red

END

I804 CHECK (TOP232P)

R895, R896 SHORT CHECK

D803, D806, D830, D831 DIODE CHECK

D836 CHECK

Check always because its part of feed back


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- 31 -

No Power on(the main power lamp is red.

stand-by Power is on)

Check I802 18V Regulator Replace

Replace 5332 Module END

END

When part is destroyed by lightning and shock, D801, Q803, FUSE is easily damagedI802 is often destroyed by shock of the primary and the secondary

Check normal voltage

END

Check voltage waveform of Q803

SPEC.3.3V, (if it is more than 1.5V:Normal

operation), if less than 1.5V:Check path of

MAIN. VIDEO Circuit

Check P805M WAFER Power ON/OFF

Check Q804 Tr, D829 SHORT TEST

Check if POWER CORD is OPEN

Check D801

Check Q803


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- 32 -

No Display

(DTV / PC Input)

When pressing Menu

button, is OSD displayed?

check LVDS of IC225E

#2,3 #5,6 #8,9 #11,12

Check output of CLK in IC213

Check Sync Output in IC216

ClK : #3, H_sync : #6, V_sync: #3

Check CLK output and Sync in IC217

CLK : IC213 of #2

H_sync : IC216 #5, V_sync : IC216 #2

Check R,G,B output of IC226

R : #35, G : #37, B : #39

Check signal output of DTV of

PC and Set Connection

Check sync output in IC227

H_sync : #3, V_sync : #6

Check DTV/PC_SEL signal#9, 10 of IC224

DTV(high), PC(low)

Check H_sync output of IC236 #7 &

sync output of IC228

h_sync : #7, V_sync : #3

Check P211M DTV input

Y : #17, Pb : #19, Pr : #21

Checkconnectionbetween#17,19,

21 of P211M and #1(Y), #2(Pb)

#3(Pr) of J108

Is No Signal displayed?

If pressing recall key, does

correct resolution to input signal ?

Check R,G,B output of IC227

R: #14, G:#15, B:#4

Check DTV/PC_SEL signal

#9,10,11, of IC230

DTV(high), PC (low)

Check PC input of P211M

H_sync: #29, V_sync : #31R : #23, G : #25, B : #27

Check Y, Pb, Pr, SCP input of P226

Y : #5. Pb : #4, Pr : #3, SCP : #31

Checkconnectionbetween#23,25,27,29,31

of P211M and #1,3,5,7,9 of P913M (side

jack)

Does Power LED operate

normally in green?

Lamp, Fan,

Abnormal Power

1

END END

IC216 abnormal

1


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No Display

(RF / VIDEO / DVD)

LAMP, FAN, Power abnormalDoes Power LED operate normally in green?

When pressing Menu button, is OSD

displayed normally?

RF signal is off RF, VIDEO Screen is off

Check U101 (1855) output

(#19-C, #21-Y, #23-V)

Check after Q106, Q107 Repair

(#E-C, #E-Y)

Is IC219 (3230) output correct?

(#Y0~#Y7, #C0~#7)

Check after IC218 (9400) repair

(#VPT00~#VPT20)

Check after

repair

Check after

connection

Check after

connection

Check Input signal

(480i)

Check after

connection

Only DVD Screen is off

Check IC219 (3230) input

(#4-B, #5-G, #6-R)

Check after IC219 Repair

(#Y0~#Y7, #C0~#C7)

Repair Engine BOARD

CheckIC217 (PW364) output

(#DPT00~#DPT23)

Check IC220 (LVDS IC) output

(#LVDS00~#LVDS09)

Check U104 (1232) output

(#5-Y/V,#6-C)

Check connection of antenna

Check TU601 (TUNER output)

repair

Check after Q101 repair (#E)

Is all Screens not displayed?

(RF / VIDEO / DVD)


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- 34 -

No SOUND

Check SOUND MUTE

Check each input CABLE

Check input signal

AUDIO AMP

Check input/output

END

MAIN L/R : IC601(#27,28) CENTER : IC602(#28)

WOOFER : IC601(#30) SURROUND L/R : IC602(#24,25)

HEADPHONE : IC601(#36,37)

RF Check TU101 SIF input Check IC601 (#67) Signal

External Input 1/2/3 Check U101 (#20,22) output Check IC601 (#47,48) Signal

DVD Check P610A (#10,11) path Check IC601 (#50,51) Signal

HDTV Check P610A (#15,16) path Check IC602 (#50,51) Signal

MAIN N/R INPUT : IC604(#7, 11) OUTPUT : IC604(#2, 4)

CENTER/WOOFER INPUT : IC605(#7, 11) OUTPUT : IC604(#2, 4)

SURROUND L/R INPUT : IC606(#7, 11) OUTPUT : IC604(#2, 4)

PC Check P613S (#11,13) path Check IC602 (#53,54) Signal

Check SPEAKER CONNECTOR

Check IC601 & IC602 output


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-35-

Z86129(caption/rating)


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Tv Lcd Projection

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Transcript of Tv Lcd Projection