Xoceco LC30D9, LC40D9 Schematic

COLOR TELEVISION

LC30/40D9

CONTENT

Safety instructions………………………………………………………………………..… Instructions on adjusting and testing…………………………….…….………………… Trouble shooting……………………………………………………….…………………… Method of software upgrading………………………………………….………………… Briefing on LC30/40D9 and its working principle……………………………………..… IC BLOCK DIAGRAM……………………………………………………………..……….

Wiring diagram……………………………………………………………..……………....

Serial NO. of parts……………………………………………………………………….… Identification criteria for the bright spot and dark spot of the LCD screen………..… Troubleshooting guide………………………………………………………………..…… Exploded views…………………………………………………………………………..… Schematic diagram…………………………………………………………………….…..

1 2 6 8 10 12 22 23 23 24 27 32

Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully.

Safety instructions

1 Instructions

1.1 Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire

1.2 Anti static measures to be taken (throughout the entire production process!):

1.2.1 Do not touch here and there by hand at will;

1.2.2 Be sure to use anti static electric iron;

1.2.3 It’s a must for the welder to wear anti static gloves.

1.3 Please refer to the detailed list bef ore replacing components that have special safety requirements. Do not change the specs and type at will.

2 Points for attention in servicing of LCD

2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to use the screen of the original model for replacement.

2.2 The operation voltage of LCD screen is 700-825V. Be sure to take proper measures in protecting yourself and the machine when testing the system in the course of normal operation or right after the power is switched off. Please do not touch the circuit or the metal part of the module that is in operation mode.

Relevant operation is possible only one minute after the power is switched off.

2.3 Do not use any adapter that is not ident ical with the TV set. Otherwise it will cause fire or damage to

the set.

2.4 Never operate the set or do any inst allat ion wor k in bad env iron ment such as w et bat hroom, la undry , kitchen,or nearby fire source, heati ng equ ipme nt an d device s or ex posur e to s unlight etc. O therwi se bad effect will result.

2.5 If any foreign substance such as water, liquid, metal slices or ot her matters happens to fall into the module, be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit.

2.6 Should there be smoke, abnor mal smell or sound fro m the module, pleas e shut t he power of f at once. Likewise, if the screen is not working after the power is on or in the course of operation, the power must be cut off immediately and no more operation is allowed under the same condition.

2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the power is off because in this case relatively high voltage still remains in the capacitor of the driving circuit.Please wait at least one minute befor e t he pulling out or plugging in the connection wire.

2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting or extrusion, collision lest mishap should result.

2.9 As most of the circuitry in LCD T V set is comp osed of CMOS i ntegrate d circuits, it’s neces sary to pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and ensure full grounding for all the parts that have to be grounded.

2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are dam aged the screen would be unable to work and no way to get it repaired.

2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.

2.12 For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual. For prolonged storage, it is ne cessary to hou se it in a n ant i-moist ure bag an d put t he m altoget her in one place. The ambient conditions are tabulated as follows:

Scope for operation

0----+50 C

Temperature Scope for storage humidity Scope for operation Scope for storage

2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen, as commmonly called “ghost shadow”. The extent of the residual picture varies with the maker of LCD screen. This phenonm enon doesn’t represent failure. This “ghost shadow” may remain in the picture for a period of time (several minutes).But when operating it please avoid displaying still picture in high brightness for a long time.

-20----+60 C 20%---85% 10%---90%

3. Points for attention during installation

3.1 The front panel of LCD screen is of glass. Wheng installing it please make sure to put it in place.

3.2 For service or instatallation it’s necessary to use specified screw lest it should damage the screen.

3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between the

screen and the glass will affect the receiving and v iew ing effect

3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and

insulation please take care to keep it in intactness so as to avoid hidden trouble.

3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.

Instructions on adjusting and testing

The adjustment of LC22K9 excludes 2.30

2.1 Adjusting and calibrating the equipment

PM 5518(video frequency signal generator), K-7253(VGA signal generator),CA210(white balancer)

2.2 Adjustment and calibration procedure

2.3 Adjusting and calibrating the monitor board

Place the monitor board o n the test ing j ig, turn o n th e pow er supp ly and swit ch on the set to s ee if it

is normal.

2.3.1 Adjusting the white balance of monitor board

Push the “Rest” key and “OK” key under the cover of the remote control set, repeat the push, enter

the factory menu. Select factory reset to initialize the MONITO R

Input the DVI signal to mo nitor boar d. (K-725 3 ti me339 p attern 63 0 8 gray degree sig na ls, input the DVI signal to socket with 26 cores of monitor board by way of patc h panel). Adjust the intermediate second and seventh gray degree with CA210 white balancer. Preset value of R,G,B CUT to 100,and R,G,B DRV to 150, then, adjust the second gray degree (bright ness: about 9nit) by R,G,B CUT, to set the color coordinates of second gray degree to 270, 283. Adjust R,G,B DRV to set the color coordinate of seventh gray degree to 270 and 283.

Note: Because the values of R,G,B CUT and R,G,B DRV directly determines the values of brightness and contrast at the DVI terminal of monitor board, the white balance should be adjusted according to the preset value strictly. The value after adjusting should be within +/-10 of the preset value.

2.3.2 Calibrating ADC of Monitor After finishing the adj ust ment of 2.3. 1, set t he VG A signal to 1024X768 60Hz mode. Access the

pane signal and connect it to VGA terminal of monitor. Adjust h port of the picture to make the picture fully occupy the screen. Enter the factory menu and select items for ADC calibration and calibrate the ADC according to the indication on the screen.

2.3.3 Adjusting the white balance of monitor:

Input 8 gray degree signals of 1024X768 60Hz mode, push “display” key on the rem ote control

set, adjust brightness and contrast, to set the brightness of second gray degree to 5nit and seventh as 400nit.

For the diagram of adjustment and calibration procedure, see diagram 1

B CUT and B DRV is fixed as 128. Adjust R G CUT,to make second degree of the color coordinate as 270 283. Adjust R G DRV to set seventh degree of the color coordinate to 270

283. Adjust R G CUT and R G DRV again and again, until both of the two gray degrees are at 270 and 283.

2.4 Connect decoder board and push button board with the monitor board verified to be normal (LC-30K9/LC40K9 power is as per connection diagram 203-L30K90-01JL whereas LC-22K9 is as per 203-L22K90-01JL). Af t er pow er on, observe if the display is normal.

Method to enter factory menu: Continuously push key of “VOL+” “Mute”, “V ideo” to enter factory menu.

When the first line of each and every adjusting item is in t he highest brightness push “ENTER” key to select different adjustment items. When VGA and DVI are input, select “mode” and then push

Production of the main board and decoders on the line

General assembly and combined calibration

Connect central signal source, check T functions (station skipping, analog quantity control etc) . Check if the outpu of speaker is normal

Input AV/S and HDTV signal and chec following functions of the terminals

Input VGA signal (one format), check i display is normal under the PC status, and functions (analog control), central o line and field etc.

Check accessories, then packing

Figure 1. Adjustment and calibration procedure

Check if FLASH is written

Check Monitor board

Check decoders in media board

“ENTER” key and select three color temperatures 6500K,9300K,12000K. Push “MENU” to quit factory menu.

Notice: Adjustment of Media Box must be performed under the mode --”Nature” of picture.

2.5. White balance adjustment for Media Box TV channel

Continuously press keys of “multi-picture”,”<”,”>”,”Confirm” to Enter the factory menu. Select “Calibration” “white balance adjustment” under the submenu. Connect AV signal(K-7253 TIME381 PATTERN 630 8 degree of gray signal). Use the white balancer to adjust both 2 the brightness and contrast so that the 2

the 7

order of brightness 350 nit. Set B CUT and B DRV fixed as 128. Adjust R,G CUT so that the 2 so that the 7

order of color coordinates are 270 283. Repeat this adjustment

order of color coordinates are 270 283. Adjust R, G DRV

order of brightness is 5 nit and

and 7th orders. Adjust

for R,GCUT and R,G DRV unt il t he t wo levels of gray degree are both set to 270,

283.

2.6. White balance adjustment for VGA port of Media Box Switch VGA signal to the mode of 1024x768 60 Hz. Access the 8 degrees of gray signal and connect to the VGA port of Media Box. Continuously press keys of “multi-picture”,”<”,”>”,”Confirm” to enter the factory menu. Select “Calibration” “white balance adjustment” under the submenu. Use the white balancer to adjust both 2 so that the 2

order of brightness is 5 nit and the 7th order of brightness 400

nit. Set B CUT and B DRV fixed as 128. Adjust R,G CUT so that the 2

and 7th orders. Adjust the brightness and contrast

order of

color coordinates are 270 283. Set B DRV as fixed. Adjust R,G DRV so that the

order of color coordinates are 270 283. Repeat this adjustment for R,GCUT

and R,G DRV until the two levels of gray degree are both set to 270,283.

2.7.White balance adjustment for HDTV port of Media Box

After adjustment in 2.4.1 is over, connect HDTV signal to HDTV port of Media Box for adjusting the white balance of HDTV port. Input the 8 degrees of gray signal in the mode of 1280 x 720 60 Hz(720p). Adjust the brightness and contrast so that Adjust the brightness and contrast so that the

order of brightness is 5 nit and the 7th order of brightness 400 nit. Continuously press keys of”multi-picture”,”<“,”>“,”Confirm” to enter the factory menu. Select “Calibration” “YpbPr white balance adjustment” under the submenu. Adjust R,G CUT and R,B GRV so that both the 2

and 7th orders of gray color are 270 283. Input 8 degrees of gray signal in the modes of 640x480 60 Hz(480 p)and 1920x540 60 Hz(1080 i)separately. Repeat the adjustment as above until the 2

and 7th orders of gray are both 270 283.

3. Functional inspection

3.1 TV function Enter search menu---auto search, connect ce ntral signal to RF terminal and ch eck if there is missing of station. Input A21 signal and check the function of CCD.

3.2 AV/S HDTV terminal

Input HDTV signal to AV/S, and check if it is normal.

3.3 VGA connector Insert VGA signal connector, input 640 x 480@60 Hz VGA format signal, and check if display is normal. If there is interfere on the picture, push the auto-adjust key on the remote control set once more, check if the display is normal.

Trouble shooting

Before servicing please check to find the possib le causes o f the troubles acco rding to t he t able below.

1.Antenna:

Picture is out of focus or jumping  Bad status in signal receiving

 Maybe broadcast signal itself is not good  Check if the outdoor antenna is disconnected.  Check if the antenna is correctly oriented.

Fringe in picture  Check if the antenna is correctly oriented.

 Maybe there is electric wav e reflect ed from hillt op or building.

Picture is interfered by stripe

shaped bright spots

There appear streaks or light color on the screen

 Possibly due to interference from automobile, train, high

voltage transmission line, neon lamp etc.

 Maybe there is interference between antenna and power

supply line. Please try to separate them in a longer distance.

 Check if interfered by other equipment and if interfered

possibly by the equipment like transmitting antenna, non professional radio station and cellular phone.

2.TV set:

Symptoms Possible cause

Unable to switch the power on  Check to see if the power plug has been inserted properly into

the socket.

No picture and sound  Check to see if the power s upp l y of liq uid c rystal TV has been

switched on. (as ca n be indic ated by th e red LED at the front of the TV set)

 See if it’s receiving the signal th at is transmitted from other

source than the station

 Check if it’s connected to the wrong terminal or if the input

mode is correct.

 Check if the signal cable co nnecti on b et we en vid eo f r equency

source and the liquid crystal TV set is correct. Deterioration of color phas e or col or tone Screen position or size is not proper  Check is the screen position and size is correctly set up. Picture is twisted and deformed  Check to see if the picture-frame ratio is properly set up.

Picture color changed or colorless  Check the “Component” or ” R GB” setti ngs of th e liqui d c r ystal

Picture too bright and there is distortion in the brightest area

Picture is whitish or too bri ght in the

darkest area of the picture

No picture or signa l produced from

the displayer if “XXX in

search”appears. There appears an indication “outside the receivable scope)

Remote control cannot work properly

No picture and sound, but only

hash.

 Check if all the picture setups have been corrected.

TV set and m ake proper adjus tm ent according to the signal types.

 Check if the contrast setting is too high.  Possibly the output quality of DVD broadcaster is set too high.  It maybe also due to improper terminal connection of the video

frequency signal in a certain position of the system.

 Check if the setting for the brightness is too high  Possibly the brightness grade of DVD player(broadcaster)is

set too high.

 Check if the cable is disconnected.  Check if it’s connected to the pr oper terminal or if the input

mode is correct.

 Check if the TV set can recei ve input sign al. The si gnal is no t

correctly identified and VGA format is beyond the specified scope.

 Check if the batteries are installed in the reverse order.  Check if the battery is effective.  Check the distance or angle from the monitor.  Check if there is any obstruct bet ween the rem ote contr ol and

the TV set.

 Check if the remote control signal- receiving window is

exposed to strong fluorescence.

 Check if the antenna cable is c orrectly connected, or if it has

received the video signal correctly.

Blur picture  Check if the antenna cable is correctly connected.

 Of if it has received the right video signal.

No sound  Check if the “mute” audio frequency setting is selected.

 Check if the sound volume is set to minimum.  Make sure the earphone is not connected.  Check if the cable connection is loose.

When playing VHS picture search tape, there are lines at the top or bottom of the picture.

 When being played or in pause VHS picture search tape

sometimes can’t provide stable picture, which may lead to incorrect display of the liquid crystal TVIn this case please press “auto” key on the remote control so as to enable the liquid crystal TV set to recheck the signal and then to display correct picture signal

Method of softwar e upgrading

Steps of soft w are upgrading are as follow s:

1. Select a serial connection wire and a VGA connection wire and then connect them by means of a patch panel;

2. Use a serial wire to connect the PC to the patch panel and set TV set to off state;

1. Open the software upgrade file holder and double click

FlashUpgraderNT(use under window 2000/XP/NT)

FlashUpgrader(use under window 98),

The following interfaces will show up after running the pr ogr am:

Based on the computer features, set up the serial port(COM Port). Select corresponding serial port

(if it’s unable to FLAS H WRITE, change t o another port) . Baud is se lected to be 115200. Then select Reset Target After Download. Click FLASH pushbutton, it’s ready to run. For other settings, please refer to the Fig. Above (already defaulted by the system, normally no need t o change).

4. Switch on TV set the FLASH wr it e program begins t o run;

5. After FLASH write is over , push but ton “cancel” will beco me flash. Then shut the main power supply

and it’s OK just switch it on again.

Note: Do not shut the power off or turn the TV set on during the FLASH write. Otherwise it may

lead to no way for flash to rewrite.

Briefing on LC30/40D9 and its working principle

LC30/40D9 is a multi-media liquid crystal TV broadcast receiver covering all systems. 40/30” liquid

crystal display screen is used as its display device. It has all-system color receiving capability. It is also provided with AV input, S-VHS input, high definition signal port of component Y Pr/Cr Pb/Cb, digital port of DVI, PC VGA input port, AV output port, and earphone output port. Thanks to the two RF input ports provided this TV set can realize browsing function of PIP,POP and multi-pictures both between video signals and between video signal and AV,VGA,DVI signals. It is also equipped with a PCMCIA card reader module, which can be connected with m emory cards like CF,SD and SM, therefore capable of playing the photos taken by digit al camera.

This TV set is also provided wit h a PCMCIA card reader module and can connect memory cards li ke

CF, SD, SM for playing the photos taken by digital camera. This machine adopts the form of set-top-box plus MONITOR. If the set-top-box is removed it is a standard computer displayer. If equipped with the set-top-box it becomes a pow erful T V receiv er. So it’s a flexible ty pe of structu re. The pow er supply is a n externally instal le d power adapter. The software prov ided ca n per for m the con trol ov er t he power su pply. Therefore the power consumption when in standby can be lower than 1 W. It’s really a kind of environmental protection energy saving “green” power supply, and up to the international advanced level.

LC40D9/30D9 liquid crystal TV driving board is mainly composed of three plates which are

respectively video processing plate, digital processing plate and monitor plate. On the video processing plate, RF signal goes through two integrated tuners and produces two routes of color all-TV signals, which are connected together w it h t w o ways of AV signal by way of plug socket and then sent to 3230IC on the digital processing plate for treatment. On this plate, TV,AV and the various ways of audio signals VGA, DVI, YpbPr, YcbCr sent from the plug socket are subject to treatment in MSP3440IC. The processed audio signals are then sent to Monitor plate for amplification treatment.

The digital processing plate in mainly intended to process various signals of TV and AV as well as

VGA, DVI, YpbPr, YcbCr on this plate itself. DVI after processing in SII161IC and VGA, YpbPr, YcbCr after processing in AD9883 as well as TV, AV signals(TTL signal)after processing in Gport 3230 are sent at the same time to PW181 for Sclar treatment. The TV, AV signals that have been processed in Vport 3230 are sent to PW181 for treatment only after deinterlacing treatment in PW1230. The signal processed in PW 181 is subject to conversion into DVI signal in IC SII170 before being output to Monitor plate for treatment.

Monitor plate functions mainly to process DVI signal from the digital processing plate and the VGA

signal from this plate itself. Furthermore, IC LX1722 also perform power amplification treatment for the audio signal that has been processed in the video processing plate.

LCD TV System Block Diagram

Media Box

VGA

Y Cr Cb AV IN

S-Video

TV1 V-CHIP RF

RF TV2

SDA SCL

RXD/TXD

power

RS232 L/R

CABLE

MONITOR

DVI monitor Lamp/ power panel

PCMCIA Module

3D Filter uPD64083

TUNER1

TUNER2

SDA555

Mcu

MSP3420

AUDIO

PROCESSOR

M62429

LX1722

Amplifier

Switch

AD9883

ADC

VPC3230 Decoder

Z86229 V-CHIP

M62494 SRS

VGA

SDRAM

PW1230

Deinterlace

II C BUS

Image Processor

Scaler

PW131

Mcu OSD

PW181

Image Processor

Scaler

Mcu PIP OSD

FLASH 29LV800TTC

MAX232

CONNECTOR

DS90C383

LVDS DRIVER

SiI170

DVI

Box power

DC IN Connector

PANEL

SPEAKER

IC BLOCK DIAGRAM

(1).PW181

IR R C VR (1:0)

RxD, TxD

NM I E X TINT

Interrupt

UART

DVS,

DHS,

DEN,

RGBE

(23:0)

RGBO

(23:0)

Decoders

Memory

OSD/ C PU

Contro er

SDR AM

OSD and C PU

Contro e r

Display Port

Bus

OSD

Mem o ry

Expander

Color Matri x,

Gamma Correction

CLTs, Color Space

OSD

B end

Contro &

DCLK

T m ng

D sp ay

Gener ator

Internal Block Diagram

*For internal cloc k genera torDCLKEXT,

A(19:0),

CPUTM S,

BHEN,

D(15:0),

RA M OE,

RAMWE,

CPUTCK,

CS(1:0),

ROMWE,

PortA

CPUT DI

CPUTDO

RD, WR

ROMOE

(7:0)

Sca er

Imag e

C ock

MCLK DCLK UCLK

Dua PLL

Generator

Watchdog

and T mer s

Memory Out Bus

XO*

XI*

M CLKEX T ,

16-b t

T urbo P

Interface

ROM/RAM

Pro cesso r

M cro p r o cesso r B u s

Ser a

2-W re

Memory

Interface

Processor

Image

Sca er

Hor zonta

Frame

Buffer

SDRAM

CRISP

Image

Sca er

Fram e

Buffer

Memory

Contro er

Reset

Bus

Memo ry In

V deo

De nter ac e

No se

Spat a

Reduc t on

Master Reset

(7:0)

PortB

(7:0)

PortC

Por tD(7:0)

GPIO PWM

Por tE(7:0)

Por tF(7:0)

VRGB

Video Port

(23:0)

Color S p ace

Sync Decoder

Converter HDCP

Auto Image Optimizer

FIELD

VVS, VHS,

VCL K , VPEN ,

GCLK, GFBK ,

Graphics Port

GHS, GSOG

GPEN, GVS,

Sync Decoder

GRGB

Color Spa ce

Auto Image Optimizer

(47:0)

Conver ter HDCP

GREF,

GCOAST,

GHSF OUT

GBLKSPL,

(2).VPC3230

Y OUT

Output

2D Scaler

Mixer

Color

Formatter

PIP

Decoder

CrCb

OUT

ITU-R 656

ITU-R 601

Mode

Panorama

PA L

NTSC

YCOE

Memory

Contrast

Brightness

SECAM

FIFO

Control

Peaking

Saturation

CNTL

LL Clock

H Sync

V Sync

AVO

Sync

Clock

Generation

C Bus20.25 MHz

C Bus

Clock

Gen.

Tint

Adaptive

Analog

CIN

Filter

Comb

Front-end

VIN1

PA L

NTSC

AGC

2 ADC

Y/G

Processing

Analog

Matrix

U/B

Component

Contrast

V/R

Front-End

Saturation

Tint

Brightness

FB FB

4 x ADC

VIN2

VIN3

VIN4

VOUT

RGB/

YCrCb

RGB/

YCrCb

+ 32 hidden pages