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8/11/2019 Xoceco Lc30b1 Lcd
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COLOR TELEVISION
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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
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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.
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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
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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
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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
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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.
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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.
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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.
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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
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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;
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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
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1
2
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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.
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3 VPC3230(N10)The block diagram of VPC3230 is shown as below:
2
In which:
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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).
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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.
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9 K4S641632C(N12)
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1
8
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12 LVC16244(N13 N14)
13 PI5330(N1)
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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
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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
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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
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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
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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
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2 6 8
9
1011
12 13
14
15
1617 18
19
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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
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876543219V
X1
R 51 6 1 0K
R517 10K R51810K
R51910K
C65
C66
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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
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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