Xoceco LC27U18 Schematic

Download

LCD TELEVISION

LC27U18

CONTENTS

Safety precautions………………………………………………………………………..…

Alignment instructions …………………………….…….……………………………….…

Working principle analysis of the unit……………………………….………….………….

Block diagram…………………………………..………………………. ……………………

IC block diagram………………………………………………………………………..……

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

Troubleshooting………………………………………………………………………..……

Schematic diagram …………………………………………………………………….…..

APPENDIX-A: Exploded views

APPENDIX-B: Part list

Attention: This service manual is only for service personnel to take reference with. Before

servicing please read the following points carefully.

Safety precautions

1. Instructions

Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire 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) It’s a must for the welder to wear anti static gloves. 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 0 ~ +50 oC

Scope for storage -20 ~ +60 oC

Humidity Scope for operation 20% ~ 85%

Scope for storage 10% ~ 90%

2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen, as commonly called “ghost shadow”. The extent of the residual picture varies with the maker of LCD screen. This phenomenon 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.

3. Points for attention during installation

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

3.2 For service or installation 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.

Alignment instructions

1. Test equipment

PM5518 (video signal generator) K-7253 (VGA signal generator) CA210 (white balancer)

2 Alignment flow-chart

The alignment flow-chart is shown as fig-1

Check DDC, HDCP KEY and CPU

Factory initialization setup

IF channel voltage of TV and AGC voltage adjustment

Support format of VGA pre-set

Adjustment for sub-brightness and white balance of VGA/HDMI (colo temperature 6500k, 9300k and 12000k)

Adjustment for sub-brightness and white balance of YPbPr/YcbCr channel

Adjustment fo r sub-brightness and white balance of VIDEO channel

Fig-1 adjustment flow-chart

3 Unit adjustments

Connect digital board, CPU board and analog board according to wiring diagram, connect with power and observe the display. Method for entering factory menu: press “SLP”, “DSP”, “MENU” and “DSP” in turn to enter factory menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust value items, press “MENU” to exit. Note: the white balance adjustment should be done under “nature” picture mode.

3.1 Initialization Enter factory menu, select “Factory settings” sub-menu, and adjustment for items of table1.

Table1 sub-menu adjustment

Items Range Introduce

PW on LOGO ON/OFF Display 5s LOGO of turn on the TV

NO Sig LOGO ON/OFF If display LOGO in no signal

Black Screen BLUE/BLACK If display blue screen and white noise wave in no signal, setting “BLUE”

Preset ex-factory

MLK 120-159 Adjustment for clock frequency (MHz) of memorizer, setting “145”.

PIP Size Middle/Large Select two component of PIP: “SMALL AND MIDDLE” and “SMALL AND BIG”,

setting “MIDDLE”.

init EEprom Start? Eeprom Initialization (adjustment for EEprom data)

3.2 Adjustment for AFT voltage and AGC voltage of IF channel in TV Input frequency for 45.75MHz and IF signal for 80dBV of TP1, adjust L107 to value 2.4v of TP2; when increase 0.10MHz of TP1 input signal, the TP2 value 1.0v at least; but decrease

0.10MHz of TP1 input signal, the TP2 value 4.0v at least.

3.3 VGA/DVI channel adjustment

3.3.1 Preset VGA channel mode

Input VGA signal (PATTERN: CROSS) of VG-849 or VG-848, select PROG850(640*400/85Hz), auto adjustment until the screen is filled with picture. Use the same method to do auto adjustment for the following items:

PROG851(640*480/72 Hz) PROG852(640*480/75 Hz) PROG853(800*600/56 Hz) PROG854(800*600/60 Hz) PROG855(800*600/72 Hz) PROG856(1024*768/60 Hz) PROG857(1024*768/70 Hz) PROG858(1280*768/75 Hz) PROG888(800*600/75 Hz)

PROG915(1152*870/75 Hz) PROG915 (1280*1024/60Hz)

3.3.2 Sub-brightness and White balance adjustment VGA/HDMI channel

a. Input VG-849 or VG-848 signal of VGA: PROG852(640* 480/75Hz) and eighth level gray-scale signal of PATTERN. Use color analyzer CA210 to adjust sub-brightness and white balance. b. Enter submenu of COLOR TEMP., Select 9300k of color temperature, set auto value of R, G and B to 50. Enter submenu of white balance, preset value of offset_R, offset_G and offset_B to 125, and preset value of gain-R, gain-G and gain-B to 100. Adjustment for brightness let the second level brightness be 3nit at least. c. Fixed value of offset_B, adjust offset_R and offset_G, let the color coordinate of the second level be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value of gain_B, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285 and 293. Adjustment offset_R, offset_G, offset_B, gain_R, gain_G and gain_B repeatedly until the value of the two levels gray-scale be 285 and 293. d. Select 6500k of color temperature, set auto value of R, G and B to 50. Fixed value of B to 50, adjust R and G, let the color coordinate of the sixth level be 313 and 329. Adjust R and G repeatedly until the color coordinate value to 313 and 329. e. Select 12000k of color temperature, set auto value of R, G and B to 50. Fixed value of B to 50, adjust R and G, let the color coordinate of the sixth level be 270 and 283. Adjust R and G repeatedly until the color coordinate value to 270 and 283. f. Input PROG852(640*480/75Hz) and the eighth level gray-scale of PATTERN signal of VG-849 to HDMI, repeatedly the b-e course. In the HDMI channel, preset value of offset_R, offset_G and offset_B to 15, preset value of gain_R, gain_G and gain_B to 25.

3.4 Adjustment for sub-brightness and white balance of YPbPr channel

a. Connect YPbPr signal of VG-849 and VG-848 to YPbPr terminal, input color signal of PROG973(1080i)PATTERN964. Select AUTOTUNE item, wait for it displays “OK”. NOTE: Don’t select AUTOTUNE item in other state.

b. Switch YPbPR signal of VG-849 and VG-848 output to the eighth gray-scale signal of PROG973(1080i)PATTERN964. prset value of offset_R, offset_G and offset_B to 15 and gain-R, gain-G and gain-B to 25. adjust brightness, let second bright to 3nit at least. c. Fixed value of offset_B, adjust offset_R and offset_G, let the color coordinate of the second level be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value of gain_B to 25, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285 and 293. Adjustment offset_R, offset_G, gain_R and gain_G repeatedly until the value of the two levels gray-scale be fixed. d. Input PROG977(720p), PROG978(480p) and PROG968(480i) mode for eighth level gray-scale signal, let the color coordinate of the second level and the seventh level 285 and 293.

3.5 VIDEO channel adjustment (TV/VIDEO/S-VIDEO)

a. Connect color bar signal of AV (PM5518, NTSC , eight level gray-scale signal) to VIDEO1 terminal, enter factory menu, preset value of offset_R, offset_G and offset_B to 15 and gain-R, gain-G and gain-B to 25, adjust brightness, let second bright to 3nit at least. b. Fixed value of offset-B to 15, adjust offset_R and offset_G, let the color coordinate of the second level be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value of gain_B to 25, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285 and 293. Adjustment offset_R, offset_G, gain_R and gain_G repeatedly until the value of the two levels gray-scale be fixed.

4 Performance check

4.1 TV function

Enter searching menu → auto search, connect RF-TV terminal with central signal source and check if there are channels be skipped

4.2 AV/S, YpbPr terminals

Input AV/S, HD signal, check if it is normal.

4.3 VGA terminal

Insert VGA terminal, input VGA format signal of 640 X 480@60 Hz, check if the display is normal. If interference exists, press the auto adjusts button on remote control again and check if it is normal.

4.4 HDMI terminal

Insert HDMI terminal, input signal of 640 X 480@60 Hz signal and check if the display is normal.

4.5 check sound channel

Check the speaker and headphone of each channel.

4.6 presetting before ex-factory

Item Setting Item Setting Item Setting

Picture mode NATURE OSD language English CCD OFF

Sound mode NORMAL HALFTONE 50 STEREO ON

N/R WEAK DURATION 30 VGA/HDMI NORMAL

SCREEN FULL MAG.C ON ANTENNA CATV

Working principle analysis of the unit

The RF signal received by antenna will be sent to tuner, then IF signal will be obtained through high amplifier and mixed frequency, through pre-intermediate amplified by V104, then it will be sent to acoustic surface-wave Z103 to do IF filter and get better IF characteristics, then it will be sent to TV board N101 (M52760E) to do intermediate amplification, phase-locked loop VCO and synchronous wave detection to get composite video signal VIDEO; after pre-intermediate amplification IF will also be sent to acoustic surface-wave Z102 to do filter at the same time, then it will be sent to N101 to do intermediate amplification and demodulate audio signal (MONO). The VIDEO signal output from M52760E together with video signals namely AV1 and AV2/S will be sent to video decoder N601 (TVP5147PFP) to de video selection, clamp, A/D transformation, comb-shaped filter and color decode, then one way will output as video output of AV OUT, one way will output 8bit CCIR656 format signal and CLK signal, then it will be sent to the main chip N101 (MST6151) of CPU; YpbPr, VGA and HDMI signals will also be sent to N101 (DVI interface can be connected to HDMI interface through the use of a passive cable converter).The main chip N101(MST6151) a multifunctional large-scale specified integrated circuit board, it has many kinds of function such as A/D and D/A transformation, interleaved/ line-by-line processing, mode transformation, low voltage differential output processing etc., then output four couples differential signal and one couple clock signal. The signals input from HDMI to MST6151 include audio signal, after processing in MST6151, it will be sent to NA01 (CS4340) to do D/A transformation and then output audio signal L/R of HDMI. Audio signal of TV output from M52760E will be sent to audio processor N301 (R2S15900SP). Audio signal L/R of HDMI output from CS4340 together with audio signal L/R of YPbPr and VGA/DVI will be sent to audio processor N301 (R2S15900SP) after selection by audio switch NA02 (HEF4052). Audio signal L/R input from AV1A and V2/S will also be sent to N301. After switching selection and sound effect processing, audio signals sent to N301 will be output as two ways of audio signal. One way will be output as the audio output of AV OUT, the other way will be sent to audio power amplifier N401 (TPA3008D2) to obtain amplified audio signal and send to speakers or headphone. The whole unit is controlled by CPU (N801) MTV412, it can be connected to tuner, TVP5147 and R2S15900SP etc. through IIC bus; and connected to MST6151 through parallel BUS and control them.

Block diagram

AV1-A AV2/S-A YPbPr-A VGA/DVI-A L/R

HDMI-A

MONO

A AV OUT L/R

V V IIC

VIDEO1 Y/VIDEO2 CCIR656 C 8bit

YPbPr VGA HDMI/DVI

L/R

BUS

TUNER

HDMI-A

AUDIO SW

A02

HEF4052

EEPROM

802

EEPROM

803

SAW Z102

SAW Z103

VIDEO DECORDER

601

TVP5147PFP

DAC

A01

CS4340

MCU

MTV412

801

IF AMP

101(TV board)

M52760E

AUDIO

PROCESSO

301

R2S15900SP

SCALER A/D D/A DEINTERLACER LVDS HDMI

101(CPU board)

MST6151DA

SDRAM

201

SDRAM

202

AUDIO AMP

401

TPA3008D2

SPEAKER

HEADPHONE

PANEL

IC block diagram

1. TVP5147

CVBS/

C/Pb

CVBS/

C/Pr

CVBS/Y

VI_1_A VI_1_B

VI_1_C

VI_2_A VI_2_B

VI_2_C

VI_3_A VI_3_B

VI_3_C

VI_4_A

Analog

Front End

Clamping

AGC

2 11-Bit

ADC

Sampling Clock

Copy

Prot ection

Detector

M U X

Timing Proc es sor

With Sync Detector

CVBS/Y

C/CbCr

VBI

Data

Processor

Composite and S-Video Processor

Y/C

Separation

5-li ne

Adaptive

Comb

Luma

Processing

Chroma

Processin

YCbCr

Interface

Y[9:0]

Output

Formatter

C[9:0]

GPIO

Host

XTAL1

XTAL2

PWDN

AVID

RESETB

DAT ACLK

80: AV OUT 2: TV-V input 7: AV1-V input 9: AV2-V/S-Y input 18: S-C input 29: SDA 28: SCL 40: CLK output 43-47, 50-52: CCIR656 format signal output 4, 5, 20, and 21: 3.3V-A power supply 38, 48, 61: 3.3V-D power supply 11, 25, 76: 1.8V-A power supply 31, 41, 55, and 67: 1.8V-B power supply

FID

GLCO

HS/CS

VS/VBLK

SCL

SDA

2. M52760SP

The M52760SP is IF signal-processing IC for VCRs and TVs. It enable the PLL detection system despite size as small as that of conventional quasi-synchronous VIF/SIF detector, IF/RF AGC, SIF limiter, FM detector and EQ AMP. FEATURES

•Video detection output is 2VP-P. It has built-in EQ AMP.

•The package is a 20-pin shrink-DIP, suitable for space saving.

•The video detector uses PLL for full synchronous detection circuit. It produces excellent

characteristics of DG, DP; 920kHz beat, and cross color.

•Dynamic AGC realizes high-speed response with only single filter.

•Video IF and sound IF signal processings are separated from each other. VCO output is used to

obtain intercarrier. This PLL-SPLIT method provide good sound sensitivity and reduces buzz.

•As AFT output voltage uses the APC output voltage, VCO coil is not used.

•Audio FM demodulation uses PLL system, so it has wide frequency range with no external parts

and no adjustment.

•QIF AMP has a fixed gain, and good characteristic for NICAM.

2: AFT 3: AGC 4, 5: picture If input 7: sound IF input 13: SIF output 10: mono sound output 18: TV- VIDEO output 14, 17: +5V-1 power supply

3. LA72700

5: SIF input 25: TV sound -R output 26: TV sound- L output 11: SDA 12: SCL 31: +9Vpower supply

4. MST6151

pins function:

207, 208: HDMI-R input 2, 3: HDMI-G input 5, 6: HDMI-B input 8, 9: HDMI-CLK input 14: HDMI-SDA 15: HDMI-SCL 20, 21: VGA-B input 22: VGA-G input 23, 24: VGA-G input 25, 26: VGA-R input 18: VGA H-sync input 19: VGA V-sync input 27, 28: PB input 29, 30: Y input 31: HDMI-G input 32, 33: PR input 54-61: CCIR656 format signal input 53: CLK input 164-171, 174: 4 difference signal output 160, 161: 1 clock signal output 188-191: HDMI sound output 200: PWW (brightness control switch) output 72-75: BUS (parallel communication signal) 49, 131, 195: 1.8V power supply 4,17,12,109,204,66,102: 3.3V power supply

5. R2S15900

2: input L of AV1 27: input R of AV1 3: input L of AV2/S 26: input R of AV2/S 4: input L of YPBPR/VGA/HDMI 25: input R of YPBPR/VGA/HDMI 5: input L of TV 24: input R of TV 6: output L of AVOUT 23: output R of AVOUT 11: L output 19: R output 18: SCL 17: SDA 28: +9Vpower supply

6. TPA3008

1: MUTE 3: R input 5: L input 20, 17: L input 41, 44: R input 15, 23, 33, 39, and 47: +18V power supply

Wiring diagram

Panel

CPU board (main board)

Power supply board

X903 X904

X10

Voutboard

TV board

Speaker

Trouble shooting

1. Fault clearance

Before servicing please check to find the possible causes of the troubles according to the table

below.

1.1 Antenna (signal):

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

 Poor signal

 Check if there are failures with the electrical connector or

the antenna.

 Check if the antenna is properly connected.

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

1.2 TV set:

Symptoms Possible cause

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

No picture and sound  Check to see if the power supply of liquid crystal TV has

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

 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.

 Maybe the shielded-layer of signal wire is not connected

properly to the connector.

 Check if interfered by other equipment and if interfered

possibly by the equipment like transmitting antenna,

non-professional radio station and cellular phone.

into the socket.

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.

 Check if all the picture setups have been corrected.

crystal TV set and make proper adjustment according to the

signal types.

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.

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

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

When playing VHS picture search

tape, there are lines at the top or

bottom of the picture.

 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.

 Of if it has received the right video signal.

 Check if the sound volume is set to minimum.

 Make sure the earphone is not connected.

 Check if the cable connection is loose.

 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 TV, In 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

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

Category Criteria

One single

spot

Bright

spot

Dark

spots

Total defected point ≤8 ≤7 ≤5 ≤4 /

Two

neighboring

spots

Tota l N o. ≤5 ≤2 ≤5 ≤2 ≤3

One single

spot

Two

neighboring

spots

Tota l N o. ≤6 ≤7 ≤5 ≤4 ≤10

15" 20" 22" 30" 40" 15" 20" 22" 30" 40"

≤5 ≤2 ≤5 ≤2 ≤3

≤2 ≤1 ≤2 ≤1 ≤1

≤6 ≤7 ≤5 ≤4 ≤10

≤2 ≤2 ≤2 ≤1 ≤5

Notes:

1. Definition of defected point (bright spot, dark spot): It is identified as a defected point if its area

exceeds 1/2 of a single picture element (R, G, B).

2. Definition of bright spot: It is identified as a bright spot if it is bright in the state of dark field and its

bright size remains unchanged

3. Definition of dark spot: It is identified as a dark spot if it is dark in the state of white field and its

dark size remains unchanged

4. Definition of two neighboring points: Defects of a group of picture elements (RB, RG, GB).

Quantity allowed Distance between two spots

≥15mm

≥10mm ≥5mm

3. Troubleshooting guide

3.1. No raster

Turn-on power supply, chec if the red indicator is light in the STANDBY?

Check if PIN8(5V) of CPU board is normal?

Check STANDBY circuit o power supply board

Press POWER button in the unit button and sensor control, check the indicator.

Check if the PIN12 of X503 in CPU board is high-level?

Check back light board

Replace N801

yes

red

blue

yes

Check if the PIN7 of X501 i CPU board is high-level?

yes

Check power supply board

3.2. Raster, but no picture

Check if the unit butto and remote control operation?

yes

Replace CPU board

Enter factory-menu, initialization EEPROM, then turn off the TV, turn on again, displa picture?

Adjust CPU boar

Does display OSD menu in screen whe press submenu?

yes

again

yes

Replace

TUNER1

yes

Check if the all channels have signal?

Which is no signal

of channels

Check if 1VPP signal and noise wave of X2 (PIN 1) in the T board?

Check if outpu

IF signal o TUNER1 (pi

11) is normal? yes

Check N101

HDMI/VGA/YPRP

Replace CPU board

3.3.no sound

Check if PIN15, PIN30 and PIN38 voltage o

401 is normal?

Check power supply

yes

Check PIN11 an PIN19 output wave o

301

Check PIN25 an PIN26 output wave o

101

Check PIN7 wave o

101

Check PIN11 wave of TUNER1

Replace TUNER1

yes

Replace N401

yes

Replace N301

yes

Replace N101

Exploded View(LC-27U18)

LC-27U18

PART LIST OF EXPLODED VIEW

NO. DESCRIPTION PART#

1 LINE CLASP 742-30091-00 2 PANEL HOLDER ASSY 615-10597-01 3 HANGING CONNECT COVER 808-10839-AF0 4 REAR CABINET COVER(LEFT) 808-10835-AF0 5 SOUND BOX CONNECTION ASSY 870-10276-00 6 SIDE DECORATIVE COVER 808-10844-120 7 AXLETREE COVER 808-10836-AF0 8 POWER CORD COVER 808-10812-AF0

9 WALL MOUNT ASSY 615-10545-00 10 AV BAFFLE(LEFT) 808-1B841-AF0 11 CPU BOARD ASSY 667-L27U18-56 12 BUTTON COVER 808-10840-AF0 13 BUTTON DECORATIVE PIECE 743-1B180-8A1 14 BUTTON BOARD ASSY 667-L32U18-05 15 LCD FIXED BRACKET 615-10542-00A 16 DISPLAY SCREEN 335-27001-00 17 18 FRONT CABINET 780-X18W0J0G1 19 POWER BOARD ASSY 667-L27U25-20 20 SOUND CONVERSION BOARD

ASSY 21 AV BAFFLE(RIGHT) 808-1B842-AF0 22 23 VIDEO PROCESSING BOARD ASSY 667-L27U18-40 24 USB BRACKET 870-3A183-AF0 25 LED COLUMN 700-60255-100 26 INFRARED SENSE ASSY 667-L27U18-09 27 REAR CABINET 780-X18RIJAF1 28 HANGING SOUND BOX ASSY 615-20502-01

667-L32U25-15

PART LIST

PART# DESCRIPTION LOCA.NO.

100-L27U180-01 LC-27U18 23

335-27001-00 DISPLAY SCREEN V270W1-L04 ! 340-10132-20 LED HFT5038CPBR 364-42201-00 SOCKET WP2-9C 485-10170-0A *POWER CORD LAP-31+LASR-24 ! 488-10012-00 BATTERY 7# ENGLISH

605-L27X183-01 BOTTOM SOUND BOX INSTALLATION GUIDE

615-10542-00A LCD SCREEN HOLDER ASS'Y (CMO)

615-10545-00 WALL MOUNT ASS'Y

655-3K301-02 (3-PINS) LEAD WITH HOUSING 655-41201-107 (4-PINS) LEAD WITH HOUSING 655-41201-309 (4-PINS) LEAD WITH HOUSING

655-4E301-87 (4-PINS) LEAD WITH HOUSING

655-6E301-59 (6-PINS) LEAD WITH HOUSING

655-81201-75 * (8-PINS) LEAD WITH HOUSING

655-B1201-25 (12-PINS) LEAD WITH HOUSING

655-B1201-50 (12-PINS) LEAD WITH HOUSING

655-TE301-19 ( 10-PINS ) LEAD WITH HOUSING

665-D0002-570 LVDS LINE 30-PINS300mm FERRITE BEAD

666-21301-00 MAGNETISM CLASPER ZCAT1325-0530A 700-60255-100 LED COLUMN( MOLD TRANSPARENT GREY 0A)

743-10181-00 LED DECORATIVE PIECE

743-1B180-8A1 KEY DECORATIVE PIECE SILVER WHITE 06 SILVERY

770-189B0-79 * IMITATEUL2468 20# 180mm TRANSPARENT

780-X18RI-AF1 BACK CABINET ( GREY 05,SILK-SCREEN )

780-X18W0-1C0 FRONT CABINET ( SILVERY WHITE 06+ BLACK )

808-10812-AF0 POWER CORD COVER BOARD ( GREY 05) 808-10829-AF0 BOTTOM CONNECT COVER BOARD GREY 05 808-10833-AF0 BACK CABINET RIGHT COVER BOARD ( GREY 05) 808-10835-AF0 BACK CABINET LEFT COVER BOARD ( GREY 05) 808-10836-AF0 AXLETREE COVER BOARD ( GREY 05) 808-10837-AF0 SIDE DECORATIVE COVER ( GREY 05)

808-10840-AF0A KEY FACE COVER ( GREY 05)

808-1B841-AF0 AV BAFFLE ( LEFT ) GREY 05 808-1B842-AF0 AV BAFFLE ( RIGHT ) GREY 05

808-2A330-202 PMMA PANEL (2H )

808-70361-00 INSULATOR ( POWER BOARD )

808-80265-01 ELECTRIC GASKET (18X14X60) ALUMINIUM FOIL

851-23008-14 SCREW SJ2824 ST3X8-Y

851-23010-14 SCREW SJ2824 ST3X10C-Y

851-23012-14 SCREW SJ2824 ST3X12C-Y

851-43010-14 SCREW F(+)T3x10A-Y

851-53008-31 SCREW SJ2825 ST3X8FT D.Zn

851-53012-14 SCREW SJ2825 ST3X12C-D.Zn

852-23006-81 SCREW SJ2829 M3X6-D.Zn

852-43006-84 SCREW F(+) M3X6-Y

852-43006-85 SCREW F(+)M3X6- BLACK

852-43010-84 SCREW F(+) M3X10-Y

852-53006-81 SCREW SJ2830 M3X6-D.Zn

852-53008-81 SCREW SJ2830 M3X8-D.Zn

852-54010-81 SCREW SJ2830 M4X10-D.Zn

852-54016-84 SCREW SJ2830 M4X16-Y

857-10002-09 COTTON FLANNEL

857-10004-00 COTTON FLANNEL

859-11302-00 INVERTER PIECE SHIELD COVER

863-81369-00A POLY FOAM (TOP ,BOTTOM SOUND BOX )

863-81370-00 POLY FOAM (BOTTOM ,BOTTOM SOUND BOX )

870-10156-00 BRACKET ( LEFT )

870-10157-00 BRACKET ( RIGHT )

870-10285-AM0 POWER SOCKET BRACKET ( BLACK )

870-30185-030 LED BRACKET ( MOLD DARK GRAY )

870-3A183-AF0 USB BRACKET ( GREY 05)

881-63071-00 GROUNDING LABEL

886-31021-00 ACCESSORY BOX (15L)

886-31842-00 CARTON BOX ( BLANK )

887-20047-01 ACCESSORY PALSTIC BAG

887-21074-00 PALSTIC BAG (100X230)

887-21163-P0 PE/PEARL COTTONPALSTIC BAG (1100X800)

894-30030-11 WASHER GB97.1-85-3-140Hv-D.Zn

894-40030-14 WASHER GB859-87 3 DZn

667-L27U25-15 SOUND SWITCH BOARD ASS'Y

343-18150-10 TRANSISTOR 2SC1815-Y V1

343-18150-10 TRANSISTOR 2SC1815-Y V2 364-361AY-00 6-PINS CONNECTORS TJC10-06A X2

364-93219-00 AV JACK AV3-14WKD X1

459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 C7 459-5210K-002 CERAMIC CAPACITOR CK45-B2H102KYR C1 459-5210K-002 CERAMIC CAPACITOR CK45-B2H102KYR C2

464-6B747-M02 ELECTROLYTIC CAPACITOR CD110-6.3V-470uF-M C3

464-6D747-M02 ELECTROLYTIC CAPACITOR CD110-16V-470uF-M C6

464-6E610-M02 *ELECTROLYTIC CAPACITOR CD110-25V-10uF-M C4 464-6E610-M02 *ELECTROLYTIC CAPACITOR CD110-25V-10uF-M C5 467-1C068-H03 CARBON RESISTOR 1/6W-68Ω-J R1 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R4 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R5 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R6 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R7 467-1C312-H03 CARBON RESISTOR 1/6W-12K-J R10 467-1C312-H03 CARBON RESISTOR 1/6W-12K-J R11 467-1C315-H03 CARBON RESISTOR 1/6W-15K-J R8 467-1C315-H03 CARBON RESISTOR 1/6W-15K-J R9 467-1C410-H03 CARBON RESISTOR 1/6W-100K-J R2 467-1C410-H03 CARBON RESISTOR 1/6W-100K-J R3

471-2A12K-00 PEAKING COIL SPT0305-1R2K-5 L2 471-2A12K-00 PEAKING COIL SPT0305-1R2K-5 L3

666-13512-00 FERRITE BEAD 253D-02 L1

782-L27U25-150A SOUND SWITCH PCB

667-L32U18-05 KEY BOARD ASS'Y

360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S1

360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S2

360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S3

360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S4

360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S5

360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S6

360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S7 364-341AY-00 4-PINS CONNECTORS JC10-4A X1

467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R1 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R2

467-1C247-H03 CARBON RESISTOR 1/6W-4.7K-J R3 467-1C247-H03 CARBON RESISTOR 1/6W-4.7K-J R4 467-1C315-H03 CARBON RESISTOR 1/6W-15K-J R5

782-L32U18-0500 BUTTON PCB

870-30184-020 KEY BRACKET ( MOLD BLACK )

877-50490-0T0 KEY (PLATE SILVERY WHITE )

667-L27U18-09 IR RECEIVE ASS'Y

343-18150-10 TRANSISTOR 2SC1815-Y V1

352-51170-00 IC HRM538BB5117 (D) N1

364-33104-00 3-PINS CONNECTORS TJC3-03AWT X2

364-34186-00 4-PINS CONNECTORS TJC10-4AWT X1

459-1410M-00 CERAMIC CAPACITOR DD410-SR104M25 C1

464-6D622-M0 ELECTROLYTIC CAPACITOR CD110-16V-22uF-M C2 467-1C047-H03 CARBON RESISTOR 1/6W-47Ω-J R3 467-1C151-H03 CARBON RESISTOR 1/6W-510Ω-J R4 467-1C151-H03 CARBON RESISTOR 1/6W-510Ω-J R1 467-1C230-H03 CARBON RESISTOR 1/6W-3K-J R2

782-L27U18-0900 IR RECEIVE PCB

667-L27U18-40 VIDEO PROCESSING CIRCUIT BOARD ASS'Y

667-L32U18-40\

VIDEO PROCESSING CIRCUIT BOARD ASS'Y (MANUAL INSERTION )

998 JUMPER WIRE 329-53601-00 CRYSTAL JA25A 3.579545MHZ G201 340-00003-00 DIODE IN4001 D409 340-00170-00 DIODE MA859 D104 340-00257-00 DIODE BYT56J D501 340-00257-00 DIODE BYT56J D502

343-21200-104 TRANSISTOR 2SC2120-Y V501

352-05550-00 *IC LM555CN (M) N503 352-05740-00 IC uPC574 (D) N504 352-52760-10 IC M52760SP N101 364-32101-00 2-PINS CONNECTORS TJC3-02A X10 364-34101-00 4-PINS CONNECTORS TJC3-04A X7 364-34101-00 4-PINS CONNECTORS TJC3-04A X8

364-341AY-00 4-PINS CONNECTORS JC10-4A X1

364-361AY-00 6-PINS CONNECTORS TJC10-06A X6 364-3B1AY-00 12-PINS CONNECTORS TJC10-12A X3 364-3D1AY-00 10-PINS CONNECTORS TJC10-10A X2

364-41207-00 ANTENNA SOCKET HR-F 364-91202-00 S-VIDEO TERMINAL CKX5-2K-2 X4 364-96228-00 AV JACK AV13-06-526 X5 458-07014-00 SAW FILTER M3951M Z103 458-0F001-00 SAW FILTER M9352M Z102 462-00215-K0 POLYESTER CAPACITOR CL11-100V-1500PF-K C128 462-00368-K0 POLYESTER CAPACITOR CL11-100V-0.068uF-K C308 462-00368-K0 POLYESTER CAPACITOR CL11-100V-0.068uF-K C309 462-00368-K0 POLYESTER CAPACITOR CL11-100V-0.068uF-K C318 462-00368-K0 POLYESTER CAPACITOR CL11-100V-0.068uF-K C319 462-20433-H0 POLYESTER CAPACITOR CL21-63V-0.33UF-J C424 462-20433-H0 POLYESTER CAPACITOR CL21-63V-0.33UF-J C425

462-20433-H0 POLYESTER CAPACITOR CL21-63V-0.33UF-J C432

462-20433-H0 POLYESTER CAPACITOR CL21-63V-0.33UF-J C433 464-6C733-M0 ELECTROLYTIC CAPACITOR CD110-10V-330uF-M C134 464-6C810-M0 ELECTROLYTIC CAPACITOR CD110-10V-1000uF-M C111 464-6C810-M0 ELECTROLYTIC CAPACITOR CD110-10V-1000uF-M C113

464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C228

464-6D747-M0 ELECTROLYTIC CAPACITOR CD110-16V-470uF-M C403

464-6E722-M0 ELECTROLYTIC CAPACITOR CD110-25V-220uF-M C418 464-6E722-M0 ELECTROLYTIC CAPACITOR CD110-25V-220uF-M C419

464-6E722-M02 ELECTROLYTIC CAPACITOR CD110-25V-220uF-M C501

464-6E733-M0 ELECTROLYTIC CAPACITOR CD110-25V-330uF-M C410

468-33207-00 POTENTIOMETER EVND8A-20K R106

471-1110H-003 PEAKING COIL EL0606SKI-101J L109 471-1110H-003 PEAKING COIL EL0606SKI-101J L506 471-1110K-003 PEAKING COIL EL0606SKI-101K L201 471-1110K-003 PEAKING COIL EL0606SKI-101K L301 471-1110K-003 PEAKING COIL EL0606SKI-101K L401 471-1110K-003 PEAKING COIL EL0606SKI-101K L411 471-1156K-003 PEAKING COIL EL0606SKI-561K L508 471-1210K-003 PEAKING COIL EL0606SKI-102K L503 471-2010K-003 PEAKING COIL SPT0305-100K-5 L706

471-2133K-10 PEAKING COIL LGA0410-330uH-K L105

471-2B68K-01 PEAKING COIL SPT0305-R68K-5 L108

475-25451-00 CERAMIC TRAP FILTER XT4.5MB Z704

477-40230-00 FIXED COIL LH470-1 L402

477-40230-00 FIXED COIL LH470-1 L512

477-60095-00 COIL 7KL004A L107

590-40721-00 TUNER TDQ-6F/W134X TUNER1

615-10511-00B TV BOARD SHIELD COVER ASS'Y (TOP ) 615-10512-00A TV BOARD SHIELD COVER ASS'Y (BOTTOM )

665-N0260-00 *COAXIAL CABLE CSYV-2B-260

666-12301-00 FERRITE BEAD TY23X13.5X6

742-30005-09 LINE TIE

808-70359-00 INSULATOR (TV)

852-53006-81 SCREW SJ2830 M3X6-D.Zn

859-1B1373-00 TVINTERFACE SPACE PLATE ( TIN 0.4)

870-10290-00 RF BRACKET

667-L27U18-40* VIDEO PROCESSING CIRCUIT BOARD ASS'Y (SMD )

*340-00001-0S SMD DIODE LL4148 D801 *340-00001-0S SMD DIODE LL4148 D802 *340-00001-0S SMD DIODE LL4148 DV01 *340-00001-0S SMD DIODE LL4148 DV02 *340-00001-0S SMD DIODE LL4148 DV03 *340-00001-0S SMD DIODE LL4148 DV04 *340-00001-0S SMD DIODE LL4148 DV05 *340-00296-00 SMD DIODE SK34 D580 *342-01380-00 *SMD TRANSISTOR BSS138LT1 V801 *342-01440-10 SMD TRANSISTOR DTC144EKA V581

*342-08470-90 SMD TRANSISTOR BC847AW V271 *342-08470-90 SMD TRANSISTOR BC847AW V272 *342-08470-90 SMD TRANSISTOR BC847AW VB01 *342-08470-90 SMD TRANSISTOR BC847AW VV01 *342-08470-90 SMD TRANSISTOR BC847AW VV02 *342-08470-90 SMD TRANSISTOR BC847AW VV03 *342-08470-90 SMD TRANSISTOR BC847AW VV04 *342-08570-90 SMD TRANSISTOR BC857 AW V270 *342-08570-90 SMD TRANSISTOR BC857 AW V802 *342-08570-90 SMD TRANSISTOR BC857 AW VV05 *353-00080-90 SMD ICATMEGA8L-8AI N801 *353-00450-10 SMD ICPACDN045YB6 NB01 *353-00450-10 SMD ICPACDN045YB6 NB02 *353-00450-10 SMD ICPACDN045YB6 NB03 *353-11090-20 SMD ICNJW1109M N202 *353-15010-10 *SMD ICAP1501K5LA N581 *353-30080-10 SMD ICTPA3008D2 NV01 *353-40530-40 *SMD IC CD4053BM NB04 *353-44400-20 *SMD IC MSP4440G N201

*454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C209 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C210 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C225 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C256 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C273 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C274 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C807 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M CB05 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M CB07 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M CB09 *454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M CB11

*454-04647-MB SMD ELECTROLYTIC CAPACITOR CDPS-16V-47uF-M C259 *454-04647-MB SMD ELECTROLYTIC CAPACITOR CDPS-16V-47uF-M C260 *454-04647-MB SMD ELECTROLYTIC CAPACITOR CDPS-16V-47uF-M C590 *454-04647-MB SMD ELECTROLYTIC CAPACITOR CDPS-16V-47uF-M C801 *454-04647-MB SMD ELECTROLYTIC CAPACITOR CDPS-16V-47uF-M C805 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M C201 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M C211 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M C226 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M C271 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M C586 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M C596 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M CB02 *454-04710-MC SMD ELECTROLYTIC CAPACITOR CDPS-16V-100uF-M CV01 *454-04747-ME *SMD ELECTROLYTIC CAPACITOR CDPS-16V-470uF-M C200 *454-04747-ME *SMD ELECTROLYTIC CAPACITOR CDPS-16V-470uF-M C257 *454-04747-ME *SMD ELECTROLYTIC CAPACITOR CDPS-16V-470uF-M C588 *454-04747-ME *SMD ELECTROLYTIC CAPACITOR CDPS-16V-470uF-M C591 *454-04747-ME *SMD ELECTROLYTIC CAPACITOR CDPS-16V-470uF-M C592

*454-06610-MA SMD ELECTROLYTIC CAPACITOR CDPS-25V-10uF-M CV26

*454-06647-MC *SMD ELECTROLYTIC CAPACITOR CDPS-25V-47uF-M CV11

*454-08533-MA SMD ELECTROLYTIC CAPACITOR CDPS-50V-3.3uF-M C214

+ 99 hidden pages

Xoceco LC27U18 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual