Xoceco Lc30b1 Lcd

8/11/2019 Xoceco Lc30b1 Lcd

1/38

COLOR TELEVISION


2/38

CONTENT

Safety instructions..

Instructions on adjusting and testing..

Trouble shooting.

Method of software upgrading......

BLOCK DIAGRAM.

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..

S h i di

1

2

6

8

10

11

20

21

21

22

26

28


3/38

Safety instructions

1. Instructions1.1 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!):a) Do not touch here and there by hand at will;b) Be sure to use anti static electric iron;c) Its a must for the welder to wear anti static gloves.

1.3 Please refer to the detailed list before replacing components that have special safetyrequirements. Do not change the specs and type at will.

2. Points for attention in servicing of LCD2.1 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 protectingyourself and the machine when testing the system in the course of normal operation or right after

h i i h d ff Pl d

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


4/38

2.10.There are lots of connection wires between parts behind the LCD screen. When servicing ormoving the set please take care not to touch or scratch them. Once they are damaged the screenwould 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 toprevent 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 0----+50 C

Scope for storage -20----+60 C

humidity Scope for operation 20%---85%

Scope for storage 10%---90%

2 13 Di l f fi d i f l i l i f i id h


5/38

See Fig.1.

Check if memory U16 has been FLASH written.

Production of main board and TV board on the line.

Check the main board

Check TV board

Combined test for eneral assembl

Connect to central signal source, check if various TV functions (station skipping, system identification, analogcontrol etc) are normal and check if earphone and speaker output are normal

I AV/S i l d h k i f i d AV/S i l

Input VGA signal and check if display is normal in the state of PCand various functions analo control, line/field center etc.

Ad ustin and calibratin TV board


6/38

6) Power for liquid crystal screen C159 anode 12 V0.3 V

7) AD9883A power C410,C17 3.3 V0.1 V

c) Connect VGA line, small conversion board of RS232 electric level and PC set, then run theprogram for FLASH upgrading. Turn on the power adapter switch and then the indication lampof infrared receiving board should be in off state. About 4 minutes later, upgrading is completedand the indication lamp turns red.

d) FLASH write DDC program2.5 Adjustment and calibration of TV board

2.5.1 Connect main board, TV board and infrared receiving board. Turn on the power supply adapterswitch and the indication lamp of the infrared receiving board will be in green. Measure TV boardX2 and PIN3 = 5 V0.2 V.

2.5.2 Press the menu twice in the TV state to enter the item of sound adjustment. Then move thecursor to the item of equilibrium. Open the cover of remote control set. Press the mute key at theupper left corner and enter the factory menu. Press the menu key again and you can see thepreset item of ex-works. Select this preset item and press volume key (+ or -) once to executethe ex-works presetting. The press confirm key to exit the factory menu.

2.5.3 Press channel key +/- to access the ex-works preset channel and check if the screen display isnormal.

2.6 Adjustment of white balance(Use white balance meter CA210 and signal generator K7253specialized for LCD. )

2.6.1 Assemble the complete set.

2 6 2 i l k b


7/38

flakes, abnormal tremble, interfering patterns or shifting. Plug the earphone line into theearphone port and check to ensure that sound should be heard from both the left and right

sound channels.3.3 YPbPr port

Press the video key of the remote control and switch the picture frameto the state of YPbPr. Connect signals 1080I,720p and 480p. Check if the color is normal and ifthere are mixed lines, snowflakes, abnormal tremble, interfering patterns or shifting. Plug theearphone line into the earphone port and check to ensure that sound should be heard fromboth the left and right sound channels.

3.4 YcbCr port

a) Connect YcbCr signal and press the key on the remote control to check if the color is normal

and if there are mixed lines, snowflakes, abnormal tremble, interfering patterns or shifting on

the picture.

b) If there is substandard product turned out, make a note on the flow card and route the product

onto the service line.

c) Plug the earphone line into earphone port and check to ensure sound should

be heard from both the left and right channels.

d) Furthermore, check if the different functions as listed in the menu are normal. For example, theadjustment for brightness, contrast, saturation degree, and acutance is normal, alt and bourdonare normal, and language, screen-display position/background and scaler are normal.


8/38

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 goodCheck 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 stripeshaped bright spots

Possibly due to interference from automobile, train, highvoltage transmission line, neon lamp etc.Maybe there is interference between antenna and powersupply line. Please try to separate them in a longer distance.

There appear streaks or light coloron the screen

Check if interfered by other equipment and if interferedpossibly by the equipment like transmitting antenna, nonprofessional radio station and cellular phone.


9/38

2.TV set:

Symptoms Possible causeUnable 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 its receiving the signal that is transmitted from other

source than the stationCheck if its 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

Check if all the picture setups have been corrected.

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 orRGBsettings of the liquid crystal

TV set and make proper adjustment according to the signal

types.

Picture too bright and there is Check if the contrast setting is too high.


10/38

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 searchtape, there are lines at the top orbottom of the picture.

When being played or in pause VHS picture search tapesometimes cant provide stable picture, which may lead toincorrect display of the liquid crystal TVIn this case pleasepress auto key on the remote control so as to enable theliquid crystal TV set to recheck the signal and then todisplay correct picture signal

Method of software upgrading

Steps of software upgrading are as follows: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;

3. Open the software upgrade file holder and double click


11/38

Based on the computer features, set up the serial port(COM Port). Select corresponding serial port(if its unable to FLASH WRITE, change to another port). Baud is selected to be 115200. Then selectReset Target After Download. Click FLASH pushbutton, its ready to run. For other settings, pleaserefer to the Fig. Above (already defaulted by the system, normally no need to change).

4. Switch on TV set the FLASH write program begins to run;


12/38


13/38

IC Block Diagram

1 PW113(N15)PW113 is the MCU of this TV set and is also its core chip. It communicates with various other chips

by means of bus line 12. The work it performs includes picture scaling (SCALER), receiving of externalcontrol signals, sending of various control signals to corresponding signal processing chips so as tocomplete relevant functions. Picture signal is input through GPORT of PW113 to SCALER for processing.The processed signal is output through GPORT as R,G,B signal and D-HS (line synchronizing), D-VS(field synchronizing), DCLK (82 MHz clock signal) and D-EN (enable signal). The external control signalreceived by PW113 includes IRIN of Pin203 (signal received by remote control), KEY [2-7] of PORTA(push key control signal) and reset signal etc. Major control signals output from PW113 include backlightcontrol signal BKLON(Pin 40), Panel power supply control signal LCDON(Pin 39), PI5V330 selectivecontrol signal VAGSEL(Pin 43), backlight adjustment signal PWMOUT(Pin 200), power amplificationmute control signal MUTE(Pin 201), LED lamp control signal LED7(Pin 46, to be high electric level whenswitched on) and selective signals for certain chips.

Block diagram for PW113 system


14/38

1

2


15/38

2 PW1230(N11)

The major function of PW1230 is to convert the interlaced video signal into line-by-line video signalso that the picture is clearer and realer and the picture frame becomes finer and smoother. In addition tothis conversion function PW1230 is capable of enhancing the image and can also be used to adjust thebrightness and contrast of the channel. Nevertheless, the brightness and contrast adjustment function ofthis TV set is performed by regulating the front end VPC3230. After the digital video signal received byPW1230 from VPC3230 is deinterlaced, it is output as 24bit digital RGB signal to GPORT of N15 PW113where it is processed. The output signals as DDCK (CLOCK), DDVS (FIELD SYNCHRONIZING),DDHS(LINE SYNCHRONIZING), DDEN (ENABLE SIGNAL) are also basic references for theprocessing of lower level.


16/38

3 VPC3230(N10)The block diagram of VPC3230 is shown as below:

2

In which:


17/38

5 TDA7495(U601)The block diagram of TDA7495 is shown below.

In whichPins 1,5 are for input of left and right sound channels.Pin 9 is control pin when STBY (valid when it is of low electric level).Pin 10 is control pin for MUTE (valid when it is of high electric level).Pin 13 is power supply pin for IC (24V).


18/38

7 MSP3450(U5)MSP3450 is an audio processing chip. It has four pairs of audio input ports, which are respectively

TV , PC-AUDIO, HD-R HD-L, AV-R AV-L. The four groups of inputs connected through bus line 12 toPW113 , which control the audio signal corresponding to the output according to different SOURCES.


19/38

9 K4S641632C(N12)


20/38

1

8


21/38

12 LVC16244(N13 N14)

13 PI5330(N1)


22/38


23/38

Serial No. of Parts

Identification criteria for the bright spot and dark spot of the LCD screen

Qty allowed Distance between two spotsCategory criteria

15" 20" 22" 30" 40" 15" 20" 22" 30" 40"One single

spot 5 2 5 2 3

2 neighboring

spots 2 1 2 1 1

Brightspo t

Total No. 5 2 5 2 3

15mm

One singlespot

6 7 5 4 10 15mm

667-L30B1-83 Signal processing board667-L30B1-15 Amplifier board

667-L30B1-40 TV board667-L30B1-09 Remote sensor board667-L32B1-05 Key board302-L30B1-01 Power adapter board

535-L30B1-01 Wall mounting parts


24/38

TROUBLESHOOTING GUIDE

NO RASTER

yes yes

no no

no

yes

no

yes

Indicator whether light

Replaceadapter

Check whether N25 Pin 7 is highlevel

Replace N25

test X17 pin 1 and 2 and checkwhether the voltage is 12V and24V

Check whether N17 pin5 the voltage 12VReplace

N17


25/38

NO PICTURE( HAVE RASTER)

Fault 1.VGA and YPBPR no picture

yes no

no yes

yes

nono

no

Check N1 pin 12waveform

Replace N1 PI5V330

Check R21 R131pin waveform

Replace N6 AD9883

Check R89 pinwaveform

Replace N15 PW113

Replace N16DS90C383A

Check N15 pin 170 waveform Replace G2


26/38

Fault 2. AV S-VIDEO and YCBCR no picture

no no

yesyes

no no

noyes

yes

Check R55 R56R57 pin waveform

Check N11 pin62waveform

Replace G1

Replace N10

Check R64 R65R66 pin waveform

Check R82 R89R93 pinwaveform Replace N16

Check N16 pin40waveform

Replace G3

Replace N11


27/38

Fault 3. TV no picture

yes

no

NO SOUND

no no

yes

yes

Check X4 pin2waveform

Replace TV board

Check fault 2

Check X601 pin 1and 3 waveform

Replace U26

Replace TVboard

Check U5 pin 24and 25 waveform


28/38

2 6 8

9

1011

12 13

14

15

1617 18

19


29/38

NO. NAME NO. NAME

1 Speakers front cover 11 Stand base

2 speaker 12 screw

3 Sound-leading part 13 back cover board

4 Speakers back cover 14 screw

5 Speaker connector 15 parts of keys

6 Front cabinet 16 back cabinet

7 LCD screen connecting frame 17 Fixing frame

8 LED column 18 main board

9 LCD panel 19 main board frame

10 Signal cable supporter


30/38


31/38


32/38


33/38


34/38


35/38


36/38

876543219V

X1

R 51 6 1 0K

R517 10K R51810K

R51910K

C65

C66


37/38

1 2 3 4 5 6 7 8

A

B

C

DD

C

B

A

1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6

2 7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 4 0 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 5 0 5 1 5 2

T P

XT _ O UT

A UD _ C L _ O UT

XT

_I N

T E S T

D / C T R

D / C T R

A N _I N2

A _ S E L

A N _I N-

A N _I N1

A V S UP

S T A NDBY

S C L

S DA

A V S S

I 2 S _ C L

M O N O

VRE F _T

I 2 S _ W S

I 2 S _D O

S C 1 _R

I 2 S _I 1

ADR

_DA

ADR _ W S

S C 1 _L

S C 2 _R

S C 2 _L

S C 3 _R

S C 3 _L

ADR _ C L

D V S UP

D V S S

I 2 S _I 2

A G ND C

AH V S S

C AP L _M

AH V S UP

C AP L _A

N C

RE S E T

DA C A _R

DA C A _L

VRE F 2

DA C M _R

S C 1 _ OL

S C 1 _ OR

VRE F 1

S C 2 _ OL

S C 2 _ OR

DA C M _ S

DA C M _L

U5MSP3450G

C330.1u

C50216V 10u

X2

TV-VIDEO5V

AV-OUTRESETSCLSDA

C5010.1u

LD10uH CJ4

16V 470uL50310uH

C50316V 10u

C320.1u

C51056p

C540.33

5V

J8AV

J9HD

J7VIDEO-OUT

C50816V 100u

5V-1 5V-1

5V-1

5V-1

L506

10uH

C8016V 10u

C810.1uC82470p

C701nC711n

C721n

C731nC741n

C6210u C6110u

C88470p

C870.1uC8610u

L50410uH

C7510u

C760.1u

C780.1u

C774.7u

C85

470pC840.1uC8310u

LB10uH

C5256p

Z118.432M

C6333p

C6433p

J10PC-AUDIO

C600.33u

C590.33u

C580.33u

C570.33u

C560.33u

C550.33u

R50510K

R50610K

R50410K

R50310K

R50210K

R50110K

1234 5

678VCC

B-outB-inB-inGND

A-inA-inA-out

U26LM358

CJ210u

CK50.1

C651u

C661u

1

2

3

4

5

J12AUDIO-OUT

R9610K

R9510K

R514R515

HD-L HD-R AV-L AV-R

C5090.1u

R5204.7k

C52047p

R5214.7k

C52147p+12V

Page: 8

123

TV-SIF16V 470uFCJ5

C5110.1uF

C5120.1uF

R525100

9V SUPPLY

C65

100n

100n

Name: TV DECODER

V T M O N

1 1

V C C

1 2

S C L

1 3

S D A

1 4

A S E L

1 5

I F - T

V - V

I N

2 1

S I F O U T

2 2

C V B S

2 3

V C C I F

2 4

A F O U T

2 5

N C

1 6

N C

1 7

N C

1 8

N C

1 9

T V - S

I F

2 0

N C

9

U2JS-2F/134

U3

B B 1 1 1 7 - 5

R5240

R5220

L 5 1 0

1 0 u H

87654321


38/38

1 2 3 4 5 6 7 8

A

B

C

DD

C

B

A

1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5

U601TDA7495

C60216V 2.2u

C603100n

I N_ L

V A R

_ L

V O L U M N

V A R

_ R

I N_ R

N C

S V R

S G N D

S T B Y

M U T E

P G N D

O U R

_ R

V C C

O U T

_ L

P G N D

R6021K

R6011K R6031K

C60416V 2.2u C606

25V 470u

V601RN1204

V602RN1204

R60410K

R60510K

5V

5V C61135V 470u

C61535V 470u

X603

X602

C6140.1u

C61625V 1000u

L60375uH VD604

RGP10

R6081/4W 3.6K

D6025Z1

C609

0.1u

C61325V 47u

5V

R609

10K R610

10K

VD603IN4148

V6032SC1015

C61025V 47u

R607

10K

1

1

R6063.3K VD6015Z1

IN_R

IN_L

STBY

MUTE

L_OUT

R_OUT

1

AUDIO

X601

J11

0

J9

J1

J40

C60725V 1u

C60825V 1u

L60210uH

L60110uH

C6170.1u

C6120.1u

Page: 9

Name: AUDIO

Date post:	02-Jun-2018
Category:	Documents
Upload:	ileana-ruvalcaba
View:	216 times
Download:	0 times

Xoceco Lc30b1 Lcd

Documents