Xoceco LC-30K9A-(W), LC-40K9A Schematic

COLOR TELEVISION

LC-30K9A(W)

LC-40K9A

CONTENT

Safety instructions………………………………………………………………………..…

Instructions on adjusting and testing…………………………….…….…………………

Trouble shooting……………………………………………………….……………………

Principle analysis of L30K9A(w) and 40K9A…………………………….………..………….

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…………………………………………………………………….…..

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 before 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 identical with the TV set. Otherwise it will cause fire or damage to

the set.

2.4 Never operate the set or do any installation work in bad environment such as wet bathroom, laundry,

kitchen,or nearby fire source, heating equipment and devices or exposure to sunlight etc. Otherwise

bad effect will result.

2.5 If any foreign substance such as water, liquid, metal slices or other 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, abnormal smell or sound from the module, please shut the power off 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 before the 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 TV set is composed of CMOS integrated circuits, it’s necessary 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 damaged 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 necessary to house it in an anti-moisture bag and put them altogether in one

place. The ambient conditions are tabulated as follows:

Temperature Scope for operation

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 phenonmenon 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.

0—+50 C

-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 viewing 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

1 Adjustment and calibration equipment

PM5518(Video signal generator), K-7253(VGA signal generator),CA210(White balancer)

2 Flow of adjustment and calibration

For flow of adjustment and calibration, see Fig. 1

Check if DDC has been FLASH written.

Production of CPU board and analog board on

the line.

Check the CPU board and analog board

Combined test for general assembly

Connect to central signal source, check i

various TV functions (station skipping, modulate

quantity control etc), check if the output o

earphone and speaker are normal

Input BS signal and check various BS functions

Input AV/S signal and HDTV signal,, check

various functions under AV/S terminal

Input VGA signal and check if display is normal

in the state of PC and various functions (analog

quantity control, line/field center etc.)

Preset before outgoing from factory

Check accessories and then packin

Fig.1 Flow process of adjustment and calibration

3 Adjustment and calibration of Monitor board

Place the monitor board on to testing jig, put the power on, start the set, and see if it is normal.

3.1 White balance adjustment of monitor board

Push the keys “Sleep” and “Confirmation” inside the cover of remote control, repeat the operation,

enter factory menu, and select FACTORY RESET to initialize the MONITOR.

Input DVI signal into Monitor board (K-7253 TIME339 PATTERN 630 eight grades of grey density

signal. DVI signal is input to 26 cores socket of Monitor board through the conversion board). Adjust the

central second and seventh grade grey density with CA210 white balancer. First preset value of R,G,B

CUT to 100,R,G,B DRV to 150. Then, adjust R,G,B CUT for second grade grey density (brightness about

9nit), so that the color coordinate of second grade grey density are set to 270,283. Then adjust R,G,B

DRV to set the color coordinates of seventh grade grey density (brightness about 400nit ) to 270,283.

Notice: Because the value of R,G,B CUT and R,G,B DRV directly decides the brightness and

contrast of DVI terminal of monitor board,(the value of brightness and contrast can be adjusted without

user menu), the adjustment of the white balance should be made according to the preset value strictly,

and the value after the adjustment should be within +/-10 of the preset value.

3.2 ADC calibration of monitor

After the completion of the adjustment in 2.3.1, switch the VGA 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 cover the screen. Enter factory menu and select ADC item of adjustment, and calibrate ADC

as per the prompt on the screen

3.3 White balance adjustment of the monitor

Input eighth grade grey density signal of the mode 1024X768 60Hz. Push “Display” key on the

remote control set, adjust brightness contrast to set brightness of the second grade to 5nit and that of the

seventh grade to 400nit. Fix B CUT and B DRV at 128. Adjust R, G CUT,to set the second color

coordinates to 270, 283. Adjust R,G DRV,to set the seventh grade color coordinates to 270, 283.

Repeat the operation for R, G CUT and R, G DRV until both of the two grades grey density are set to

270,283.

4 Adjustment of the decode plate of Media Box

Connect the decoder board, press key board and the Monitor board that is already confirmed as

normal as per the wiring diagram 203-L30/40K90-02JL. Put the power on and observe if the display is

normal.

Method of entering factory menu:Continuously press keys of”VOL+”“Mute”“Video”to enter the

factory menu. When the first line of each adjustment item is in high brightness, push the “ENTER” key to

select different adjustment item; push “ENTER” key after the mode is selected with VGA input and select

three color temperatures 6500K,9300K,12000K; push “MENU” to quit the factory menu.

Notice: The Media Box adjustment should be per f or m e d under the picture mode of “Nature”

4.1 EEPROM initialization

Enter the first page of factory menu, push “ENTER” key after selecting Clear EEPROM, shut off the

power supply after the appearance of “OK”.

4.2 VGA channel adjustment

4.2.1 VGA channel mode preset

Input VGA signal of K-7253(PATTERN 5:Final Test),select TIME301, push”AUTO”key to

automatically adjust to make the picture fully cover the screen. Likewise, automatically adjust TIME302,

TIME303, TIME311, TIME313, TIME315, TIME316, TIME317, TIME319 and TIME339 respectively.

4.2.2. ADC adjustment of VGA channel

Input the signal of 64 grades of grey density to K-7253 TIME311,PATTERN474, set ADC-gain to

max.(not exceeding 20) so that the two brightest grades are distinguishable.

4.2.3 White balance adjustment of VGA channel

Input the signal of 8 grades of grey density to K-7253 TIME311,PATTERN471, enter the adjustment

menu of white balance, use the white balance to adjust second and seventh grade.

Select mode as 6500K,adjust offset_R, offset_G, offset_B,so that the second grade color

coordinates are 313,329 and the brightness about 5nit. Fix gain_R to be 128, adjust gain_G, gain_B so

that seventh grade color coordinates are 313, 329. Adjust offset_R, offset_G, offset_B and gain_R,

gain_B,again and again until two grades of grey density are both set to 313,329.

Select mode as 9300K,adjust offset_R, offset_G, offset_B,so that the second grade color

coordinates are 281,311 and the brightness about 5nit. Fix gain_G to be 128, adjust gain_R, gain_B so

that seventh grade color coordinates are 281, 313. Adjust offset_R, offset_G, offset_B and gain_R,

gain_B,again and again until two grades of grey density are both set to 281,311.

Select mode as 12000K,adjust offset_R, offset_G, offset_B,so that the second grade color

coordinates are 270,283 and the brightness about 5nit. Fix gain_B to be 128, adjust gain_R, gain_G so

that seventh grade color coordinates are 270, 283. Adjust offset_R, offset_G, offset_B and gain_R,

gain_G,again and again until two grades of grey density are both set to 270,283.

Notice: The value of gain_R, gain_G, gain_B can not exceed 128.

4.3 TV channel adjustment

4.3.1 VCO,OPTION, sub-brightness, and sub-contrast adjustment

Input the AV color bar signal(PM5518 COLOUR BAR 100%)to VIDEO 1 terminal, enter the first

page of factory menu, select auto color, push key “ENTER”. About two seconds later, OK will be

displayed, showing the adjustment is over. Adjust the value of Option to 9,S-bright to 124,S-contrast to

140.

4.3.2 White balance adjustment of TV channel

Input AV signal (PM5518,grey grade signal), enter the adjustment menu of white balance,use the

white balancer to adjust the second and seventh grade grey density. Adjust

offset_R,offset_G,offset_B,so that the second grade color coordinates are 270,283 and the brightness

about 5nit.Fix gain_B to be 133, adjust gain_R,gain_G, so that the seventh grade color coordinates are

270, 283. Adjust offset_R,offset_G,offset_B and gain_R,gain_G, again and again until two grades of grey

density are both to 270, 283.

4.4 White balance adjustment of D4 channel

Connect YPbPr signal of K-7253 to D4 terminal,input eighth grade grey density signal of

TIME380(480i)PATTERN471,adjust S-bright to 120,S-contrast to 140.Enter the adjust menu of white

balance,use the white balancer to adjust second grade. Adjust offset_R, offset_G, offset_B,so that the

second grade color coordinates are 270,283 and the brightness about 5nit.

Separately input eight grades of grey density signal in mode of TIME392(480p), TIME394(720p)

and TIME396(1080i). Repeat it so that the second grade color coordinates are 270,283 and the

brightness about 5nit.

5 Functional Inspection

5.1 TV function

Enter the search menu → auto search, connect RF-TV terminal to the central signal source, check

if there is station skipping.

5.2 BS terminal

Input satellite signal to RF-BS terminal,check if the picture and sound of three channels,

BS-5,BS-7,BS-11, are normal. Switch to BS-5 channel,Use oscillograph to check if the terminal

output (Bit Stream/Detection Out) is normal(Bit Stream is 1 Vpp data flow; Detection Out is 1.34 Vpp

detective wave signal).

5.3 AV/S,D4 terminal

Connect AV/S, HDTV signal, check if they are normal.

5.4 VGA connector

Insert VGA signal connector, input format signal 640 x 480@60 Hz VGA, check if the display is

normal. If there is interfere in picture, push the adjustment key on the remote control set one more

time, check if the display is normal.

5.5 PCMCIA channel inspection

Insert PCMCIA card, switch it over to this channel, and check if the display is normal.

5.6 Sound channel inspection

Check if the output of each speaker and earphone channel is normal.

5.7 For factory preset, see table. 1

Table 1 Factory Preset

Item Factory

Preset

Picture

mode

Sound

mode

N/R WEAK SPEAKER ON AV1/DECODER AV1

SCREEN 16:9 HEAD

NATURE OSD

NEWS VGA color

Item Factory

Preset

Japanese BALANCE 50

language

9300 BS POWER ASSOCIATE

temperature

ON SRS ON

PHONE

Item Factory

Preset

Trouble shooting

Before servicing please check to find the possible causes of the troubles according to the table 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 wave reflected from hilltop 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 supply of liquid crystal TV has been

switched on. (as can be indicated by the red LED at the front

of the TV set)

 See if it’s receiving the signal that 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 connection between video frequency

source and the liquid crystal TV set is correct.

Deterioration of color phase or color

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”RGB”settings of the liquid crystal

Picture too bright and there is

distortion in the brightest area

Picture is whitish or too bright in the

darkest area of the picture

No picture or signal 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 make proper adjustment 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 proper terminal or if the input

mode is correct.

 Check if the TV set can receive input signal. The signal is not

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 between the remote control and

the TV set.

 Check if the remote control signal- receiving window is

exposed to strong fluorescence.

 Check if the antenna cable is correctly 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

Short introduction and w or k i ng principle of LC-30K9A(W)/LC-40K9A

This type series of the machine set takes the form of STB plus MONITOR. Without STB, it is a

standard computer monitor. With STB, it is a CTV receiver with powerful functions.

For work principle flow of this series, refer to block diagram of a complete set.

The RF signal of broadcast TV, with the help of tuner TUNA02, turns out color full TV signal TV-IN2

and second sound IF signal. The RF signal of satellite TV with the help of BS tuner TUNA01, produces

color full TV signal TV-BS and left and right sound signal R/L. TV video signal of TV-IN2 and TV-BS after

the selection by PI50V330(U40-1) is sent to video decoder VPC3230(U29). The YcbCr and PCMCIA

input from commuter board and the YUV after selection in U40-2 are also sent to U29 respectively.

Furthermore AV1/SVHS,AV2 are also sent to U29. After the selection of above four video signals are

subject to selection and decoding in U29 and then sent in format of 8 bi ITU-R656 to FLI2310(U13)for

progressive treatment. One route of the video signal that is subject to selection in U29 is sent to output

through AV.

Two routes of D4 signal, YpbPr, after the selection in BA7657F(U11), are sent to MST9883(U30),

where they are sent, after A/D conversion, to U13 in the format of 24 bit YUV.

24bit RGB signal is output and sent to main processing chip JAG-ASM(U12) after the above two

routes of signal are processed in terms of matrix, color density, and tint in U13. RGB signal of computer

VGA is also sent to U12, where the two routes of signal are subject to selection and processing for

picture format. One route RGB signal of VGA undergoes A/D conversion before being subject to

selection and digit display processing together with another route of signal, including OSD, GAMMA

calibration, brightness and contrast processing. These signals are changed into the format of 1024*768

and output in 24 bit RGB signal. This signal is then converted into DVI signal(four pairs of differential

signal) in SiI170 and sent to MONITOR.

In MONITOR, four pairs of differential signal from STB are sent to PW131(N301). As there is also

VGA input terminal in N301, the two signals, after the selection and formatting, output to output in 48bit

RGB signal and sent to LVDS converter DS90C383(N201, N202), where they are converted to four pairs

of low voltage differential signals and then send to LCD screen for picture display.

The audio signal of left and right sound channels D4, YCBCR and PCMCIA undergoes selection in

HEF4052(U34), and is then sent to MSP3420(NA04). AV1/SVHS and AV2, after selection in

HEF4052(U34), is sent to NA04 together with SIF of TUNA02 and R/L of TUNA01 as well as R/L of

VGA two tuners and R/F of VGA. In NA04, SIF is demodulated into audio signal before being switched

for selection with other four routes of R/L signal. The selected R/L after the processing in volume and

sound effect is then output as follows: three R/L routes for left and right sound channels, one route for AV

OUT, and another route for M62494(N203)of SRS sound field processor for SRS processing. The signal

output to left and right sound channels is sent to MONITOR, and after sound power amplification in

LX1722(N404), is for driving the speaker. The last route, after power amplification of earphone in

TLE2142, is for driving the earphone.

The power supply is through an adaptor, where it is converted to different power supplies required

by monitor and STB.

LC30K9A(W)/40K9A BLOCK DIAGRAM

Media BOX

VGA

BS-RF

AV1-V/S-Y

SVHS-C

AV2-V PCMCIA

YCbCr

AV-V OUT

D4-1

D4-2

BA7657F

U11

R/L

TUNA01

TUNA02

SIF

U40-2

PI50V330

MST9883

TV-BS

TV-IN2

PI50V330

VIDEO DECODER

VPC3230

U30

ADC

U40-1

U29

RGB

ITU-R656

8bit

24bit YUV

U13

DEINTER

LACER

FLI2310

U14

SDRAM

I C BUS

EEPROM

RGB 24bit

U12

SCALER

JAG-ASM

U19

SDRAM

U20

SDRAM

MICRO-CONTRLER

TSC80251G2D

RGB 24bit

CONNECTOR

U38

DVI

SiI170

KEY BOARD

TO MONITOR

FLASHMEMORY

SIF AV1/SVHS-R/L AV2-R/L VGA-R/L

BS-R/L

PCMCI-R/L (D4-1)-R/L (D4-2)-R/L YCbCr

AV-R/L OUT

HEF4052

NA03

R/L

NA04

TO MONITOR

HEF4052

U34

AUDIO

PROCESSOR

R/L

MSP3420

NA05

SRS 3D STEREO

CONTROLLER

M62494

R/L

NA08

TLE2142

R/L

HEADPHONE

MONITOR

N401 M62429E

R/L

N404 LX1722 Amplifier

VGA

Media BOX

CONNECTOR

DVI

N301 Image Processor Scaler MCU OSD

48bit

BOX power

monitor power

DXE N201 DXO N202 DS90C383 LVDS DRIVER

DC IN connector

2 x 4

lamp/ panel

PANEL

SPEAKER

IC BLOCK DIAGRAM

1.MSP3420

Pins description:

2,3 PIN:SCL,SDA applied for control the operation of IC . 27,28 PIN:output left and right sound channel R/L to speaker processor. 36,37 PIN:AV OUT of sound R/L. 47,48 PIN:D4-1/D4-2/PCMCIA/YCbCr selected input R/L. 50,51 PIN:Input of VGA. R/L 53,54 PIN:Input of AV2/SVHS(AV1) R/L. 56,57 PIN:Input R/L of BS 67 PIN:Input TV SIF.

2.VPC3230

Pins description:

4 PIN: Input U of PCMCIA/YCbCr. 5,73 PIN: Input Y of PCMCIA/YCbCr. 6 PIN: Input V of PCMCIA/YCbCr. 31-34, 37-40 PIN:output format signal of.ITU-R656 70 PIN:Video of AV OUT 71 PIN:Input C of SVHS. 72 PIN:input Video (SVHS in priority) of Y or AV1 of SVHS. 74 PIN:input Video of AV2. 75 PIN:input Video of TV/BS.

3.PW131

A/D

Clamp

Color Space

Converter

DVI

Receiver

CLK

RGB

HS,VS

RXC +/-

RX0 +/RX1 +/RX2 +/-

RTERM DEN

CLK

RGB

HS,VS

Data MUX

Auto Image

Optimization

DRGB (23:0)

DGRGB(23:0)

DVS, DHS, DEN, DCLK

NMI

Interrupt

Controller

RxDTxD

UART

Watchdog

and Timers

Processor ROM/

RAM Interface

JTAG Debugger

16-Bit

Microprocessor

PortA(7:0)

GPIO PWM

Decoder

(19:1)D(15:0)CS(1:0)

2-Wire

Serial

Microprocessor Bus

Display Timing

Generator

Memory

Buffer

Processor

Memory

Interface

OSD

VYUV(7:0)

VCLK VPEN

PW131 ImageProcessor

Internal Block Diagram

ADC

DVI

VIDEO

PORTD (7:0)

Sync

Processing

HSYNC,

VSYNC

SOG

Stripper

SOGIN

FILT PLL

CLK

AIN

A/DClamp

Scaler

Color

Matrix

OSD

and

Gain

Color

Lookup

Tables

Color

Space

Expander

PowerOn

Reset

RESET

Reset

XI XO

PLL and

Oscillator

MCLK DCLK UCLK

4.JAG-ASM

5.SiI170

+ 40 hidden pages

Xoceco LC-30K9A-(W), LC-40K9A Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual