Elenberg CTV-1540, CTV-2065, KLC-TM1508, KLC-TM2018 Schematic

LCD TV SERVICE MANUAL

Elenberg CTV-1540, Elenberg CTV-2065

Model list

KLC-TM1508

KLC-TM2018

KONKA GROUP CO,LTD.

Digital Flat Display Division

IMPORTANT SERVICE SAFETY INFORMATION

Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these

models should only be performed by those who are thoroughly familiar with precautions necessary when working on

high voltage equipment.

Exercise care when servicing this chassis with power applied. if carelessly contacted, can cause serious shock or

result in damage to the chassis. Maintain interconnecting ground lead connections between chassis, escutcheon, picture

tube dag and tuner when operating chassis.

When it is necessary to make measurements or tests with AC power applied to the receiver chassis, an Isolation

Transformer must be used as a safety precaution and to prevent possible damage to transistors. The Isolation

Transformer should be connected between the TV line cord plug and the AC power outlet.

It is important to maintain specified values of all components and anywhere else in the received that could cause

a rise in operating supply voltages. No changes should be made to the original design of the receiver.

Components shown in the shaded areas on the schematic diagram and/or identified by in the replacement parts

list should be replaced only with exact factory recommended replacement parts. The use of unauthorized substitute

parts man creates may create shock, fire, or other hazards.

Before returning the receiver to the user, perform the following safety checks:

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis

and other metal parts in the receiver.

2. Replace all protective devices such as non-metallic control knobs, insulating fish papers, cabinet backs, adjustment

and compartment covers of shields, isolation resistor-capacitor networks, mechanical insulators etc.

3. To be sure that not shock hazard exists, a check for the presence of leakage current should be made at each exposed

metal part having a return path to the chassis (antenna, cabinet metal, screw heads knobs and/or shafts, escutcheon,

etc.) in the following manner.

Plug the AC line cord directly into a 110V/220V/240V, AC receptacle. (Do not use an Isolation Transformer

during these checks.) All checks must be repeated with the AC line cord plug connection reversed. (If necessary, a

non-polarized adapter plug must be used only for the purpose of completing these checks.)

PLEASE READ BEFORE ATTEMPTING SERVICE

1. Use an Isolation Transformer when performing any service on this chassis.

2. Never disconnect any leads while receiver is in operation.

3. Disconnect all power before attempting any repairs.

4. Do not short any position of the circuit while the power is on.

5. For safety reasons, replace components any with identical replacement parts (SEE PARTS LIST).

6. Before alignment, warm up the TV for at least 30 minutes.

7. When removing a PCB or related component, after unfastening or changing a wire, be sure to put the

wire back in its original position.

8. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use only

specified silicon grease. Remove all old silicon when applying new silicon.

9. Before removing the anode cap, discharge eletricity because it contains high voltage.

A. SPECIFICATION

System : Colour System:PAL,SECAM

Sound System:DK/BG/I/M

Audio output power 10%THD 1W X 2KLC-TM1508

10%THD 2W X 2KLC-TM2018
Antenna Impedance 75(Unbalance)
Power Consumption 48WKLC-TM1508

60WKLC-TM2018
Power Supply : AC~100-240V,50/60Hz (Adapter)-----KLC-TM1508

DC12V 4ATV------------------KLC-TM1508

AC~100-240V,50/60HzTV -------KLC-TM2018

item Port list KLC-TM1508

1 RF cable
2 Video and Audio
3 S-Video

4 Headphone audio output

5 VGA

5 DC 12V input

item Port list KLC-TM2018

1 RF cable
2 Y Pb /Cb Pr /Cr

Audio2(YPb/CbPr/Cr and PC Audio

3

input)

4 VGA

6 Video and Audio1

7 S-Video
8 Headphone audio output
9 AC Power input

1.Preface

1.1 Applicable area

This test manual is applicable for KLC-TM1508.

1.2 Test notes

1.2.1 Please follow the pointed test steps and choose the proper test equipment to
conduct adjustment, otherwise good effect of TV set could not be obtained. Pointed bias
voltage value should be ensured during test to get satisfied test result.

1.2.2 Be sure that you have the static electricity –protective glove in before test.

2 Test environment

1Temperature15~35°C
2Relative humidity 45 ~ 75%
3Air pressure: 86 ~ 106kPa

3 Test equipment

1) Computer 1

2) Oscilloscope100MHz 1

3) Multimeter (VICTOR VC9801) 1

4) DC Voltmeter 1

5) Oscilloscope Tektronix2232 1

6) :PR-602A 1

7) : Tektronix TCP300  1A  TCP312W 1 

8)  :Tektronix ! P6015A(1000  1)

1 

9) "#$%Agilent! 34401A&' FLUKE 187/189 1

4 T he item and method of debugging

4.1 Adjustment manual book of LCD panel Four-CCFL inverter

(PCB Board P/N:35007175)

4.1.1 Test method

4.1.1.1 While mesureing the inverter ,we usually connect the high voltage probe to the

output,but this will change the original path value called load effect. Most

high voltage probes have 3PF capacitacne such as Tektronix P6015A,when we
measure the Four-CCFL inverter,in order to balance the load effect of two
sides ,we advise using two high voltage probes to measure two side outputs.

3P Tektronix
P6015A

CS

CP

CCFL

CCFL

3P Tektronix
P6015A

CS

OutL

CP

L

OutR

L

4.1.1.2 For MP1018 project,the outputs have the capacitance divider ,see figure as

below,when we measure the output voltage,we may measure the parallel connection
voltage value of the C722 and C730 or C724 and C731,then according to theformula
Vout1=Vc1*(C722//C730)/C721,Vout2=Vc2*(C724//C731)/C723,we m ay get the output
voltage value(Vc1,Vc2 means the parallel connection voltage value of the C722
and C730 or C724 and C731). At the same time ,we should pay attention to the
followings : First,observe the output voltage waveform is distort or
not.Second ,observe t he output waveform fr equency is between 40 kHz and 60kHz or
not.Third,disconnecting any output ,observe the start-up voltage and start-up
time is right or not.

4.1.1.3 Because the a ctual impedance and t heoretical impedance of the LCD panel's l amps

have a little tolerance,we pay more attention to the output current in actual
measurement.The LCD panel's lamps need a constant current s ource to maintain
the brightness,so we may make a high frequency amperemeter in series with the

low-voltage output of XS702,XS703,XS704,XS705,then adjust the input voltage
equals 12V,as long as the current meets the requirement of the
specification(5.5--6.5mA),it can keep the brightness of the lamps.

4.1.1.4 Force 0-5V voltage to the input port that is the third pin of XS701.

Confirm if it will shut down at 0V and start at 5V.

4.2 Digital signal part

KLC-TM1508 start order

Turn on the

power 12V

N404 RESET and

IO port initialize

Other IC electrify,
reset, initialize

Turn on LCD Panel

Supply Power

Turn on back light

lamp,Successful start

4.2.1 After turning on the power, if blank screen appears (no back light lamp), just

press POWER button several times, if blank screen still there,

4.2.1.1 Check if the voltage of every power supply is normal.

4.2.1.2 Check if the crystal oscillator Z402 (14.318180MHz), Z301 (24.576MHz)

oscillate or not, and oscillate frequency is right or not.

4.2.1.3 Back light control signal (BKLON) of PIN 3 of XS514 has high level (about 5V)

or not, if not, chec k whether fault sold ered or short circui t happened to
Q504,R580,R588.

4.2.2 If back light lamp lights but no screen displays,check N404 reset circuit

and crystal oscillator output to make sure CPU is under work, if CPU is
under work, then check signal channel. Signal channel is composed of two
parts: Video channel (including antenna, AV, S-terminal input) and RGB
channel for PC. If no picture displays or bad code displays when input
either of these two channel signal in turn, control signal maybe wrong,
then use oscilloscope to check waveforms at test points DEN, DVS, DHS
and DCLK are normal or not following the rule from back to front.

4.2.3 If just picture color has problem, then shift input to RGB input, and output

R,G,Bmono signal from computer to find the wrong color, then use oscilloscope
to test XS504 pin to find the wrong data cable following the same order.

4.2.4 If just video channel has problem, check N301 signal output VCLK,V-Hs,

V-Vs(TEST POINT), control signal -DVS DHS DCLK and DEN output from
movement compensation N404have waveform or not to find the problem.

4.3 IF Channel adjustment

4.3.1 Preparation steps

4.3.1.1 Connect (+) of RF of TV signal generator PM5518 to Pin 11 of RF TUNER

N1000, (-) to Pin 3 of RF TUNER N1000.

4.3.1.2 Set TV signal generator PM5518 RF output to the maximum.

4.3.1.3 Set TV signal generator PM5518 RF Output to 38.0MHz, and set video

output signal of this signal generator to gray scale.

4.3.1.4 Connect DC Voltmeter “+” to Pin 8 of N1000, - to RF TUNER cabinet.

4.3.1.5 Connect oscilloscope probe + to Pin 10 of XP6010, - to RF TUNER
cabinet, then set oscilloscope to 50mV/div Time/div TV-H( s), and set
to TV-H simultaneously.

4.3.1.6 Connection between TV board and TESTER is shown as the following
figure (4).

4.3.2 Adjustment steps

4.3.2.1 Plug the power cord.

4.3.2.2 Turn T1000 magnetic core with ceramic aligner screwdriver so that
reading on DC Voltmeter is 2.5V 0.2V.

4.3.2.3 Waveform of T2 on the oscilloscope can be observed as the
figure (5) shown.

4.4 AGC adjustment

4.4.1 Preparation steps

4.4.1.1 Connect TV board whose IF has been adjusted to Power board and
motherboard (Do not install TV board into the back cabinet).

4.4.1.2 Set TV signal generator to 56 channel (855.25MHz), apply RF 62dB 3dB
half color bar signal and input to ANTENNA INPUT of RF TUNER.

4.4.1.3 Connect (+) end of DC Voltmeter to Pin 1 of N1000 of RF TUNER, (-) end to

Pin 3 of RF TUNER.

4.4.2 Adjust steps

4.2.2.1 Check if connections connect well, start automatic searching.

4.2.2.2 Press PROG. / button to display the channel you hav e received on the scre en

after automatic searching finishing.

4.2.2.3 Adjust VR1000 with small screwdriver so that DC Voltmeter is within 2.0V –

2.5V(maximum),then reverse VR1000 and just make c onfusi onal of noi se
disappear on the picture.

4.5 White calibration adjustment
1 Receive black or white signal under AV or PC mode, adjusting brightness and contrast to set
the brightness to 15Nit in dark area and 90 Nit in bright area.
2 Adjust white balance.Press(MENU”button once, then press “PRE.CH”five times to enter
factory menu, select “Temp” Menu,

Adjust Red 0-100

Green 0-100
Blue 0-100

3 Adjusting chromaticity coordinates of black and white to fit the requirement (X=0.313,
Y=0.329), or plug automatic calibration system to adjust white calibration automatically.

KLC-TM2018

1.Preface

1.1 Applicable area

This test manual is applicable for KLC-TM2018.

1.2 Test notes

1.2.1 Please follow the pointed test steps and choose the proper test equipment to
conduct adjustment, otherwise good effect of TV set could not be obtained. Pointed bias
voltage value should be ensured during test to get satisfied test result.

1.2.2 Be sure that you have the static electricity –protective glove in before test.

2 Test environment

1Temperature15~35°C
2Relative humidity 45 ~ 75%
3Air pressure: 86 ~ 106kPa

3 Test equipment

1) Computer 1

2) Oscilloscope100MHz 1

3)Multimeter (VICTOR VC9801) 1

4)DC Voltmeter 1

5)Oscilloscope Tektronix2232 1

6)Cem

7)Test Clamp 1

8TV signal generator 1

4 .T est i tem a nd met ho d

4.1 Power Supply Board

4.1.1 The input and output characteristic test of power

4.1.2 Intention of test: Check input and output to find if short circuit.

4.2 checking method:

ent Resistance 1

use Multimeter (VICTOR VC9801) of resistor to check
Number Item Test Point Standard
1 The resistor of AC

input

2 The resistor of V12

output

3 The resistor of V12

assistant power output

Please check short circuit point on the PCB board if you find short circuit.

4.2.1 Test after supply AC 220V

4.2.2 Intention of test:

4.2.3 Supply AC 220V step by step,then the circuit start to work

4.2.4 Test the voltage of output

4.2.5 Short output test

4.2.6 The Peak-Peak value yawp test of the power output

4.2.7 The test of turning on and off TV

4.2.8 Checking method

4.2.9 Test the empty loading output of power supply Fix the power supply board on Test
clamp unconnecting the load then input 220VAC and turn on power switch to test the output
voltage by multimeter

AC Input Connector XS901 No short

circuit

V12 output of connector XS902 No short

circuit

Between the pins of C908 No short

circuit

Number Ietm Test point Empty loading Standard
1 V12 voltage Output of V12 0.0A 12.0V 0.48
Listen if there is deviant noise at the same time.

4.2.10 Test the rated load output voltage Turn off the power then connecting the load
on output and turn on the power to test the output voltage by multimeter Rated load
output voltage / current are as follows:

Number Item Current standard Voltage standard
1 V12 s rated load 5A 12.0V 0.48
Listen if there is deviant noise at the same time.

4.2.11 Test of V12 s shorting-output protect
Make the output shorted in 3 seconds the output voltage should be 0V.after relieving

the short ,turn off the power and discharge the input filter capacitor C904 10 seconds
by discharge resistance (cement resistance 2-5W510 ),then supply the power again
using multimeter to test the output of power The output voltage should come back
normally 12.0V 0.48

4.2.12 The test of powers peak-peak value yawp output Under the rated load

Initialize the oscill oscope 50mV per unit and parallel-connect 0.1UF and 10UF capaci tor
on probe to see the output ripple is OK or not.

Number Item Test point Standard
1 12V output V12 output 150mV

4.2.13 The fully loading and empty loading experiment of turning on/off TV

Turn on/off TV per 5 times every 5 seconds under the two states .Make sure if the ou tput
is OK or not.

4.2.14 The standard of power aging experiment

Every product should aging 8 hours under rated load and 45 C Make sure the output

voltage is in regular range.

4.3 Digital signal part

4.3.1 Digital signal board power part

4.3.2 Verify the state of TV set

Please switch the TV on by “Power on/off” switch,then verify the LED color of touch

button.If it is red(standby state),the back-end power has been shut off(the voltage
of N802 No.5 pin is 0V),the supply power for IC-chip has been shut off except N803
normally working.Please test the voltage of D616 is 5V to verif y the power of N803 no rmal
on standby state.

4.3.3 Checking Supply Power.

If the color of LED is green,the power supply for signal board(Test the Number
5,6,7,8 pin of N802 v oltage is 12V).N801 supply 5V power(Test the anode of C853).N 810
N811 supply 3.3V(Tes t the No.2 pin),N812 N813 supply 1.8V(T est the No.2 pin)for main
IC N407,N305.

4.3.4 D

igital signal part

KLC-TM2018 start order

Turn on the

power

N407 RESET and

IO port initialize

Other IC electrify,
reset, initialize

Turn on back

light lamp

Successful start

and LOGO display

4.3.5 After turning on the power, if blank screen appears (no back light lamp), just
press POWER button several times, if blank screen still there

4.3.6 Check if the voltage of every power supply is normal.

4.3.7 Check if the cr ystal oscillator Z4. 1(14.318MHz)oscillate or not, and oscilla te

frequency is right or not.

4.3.8 Back light control signal (BKLON) of PIN 3 of XS512 has high level (above 3.5V)
or not, if not, check whether fault solder ed or short circuit h appened to V507, R559 ,
R560,R561

4.3.9 If back light lamp is on while there is no display,check N407’s reset circuit
and the output of the oscillator to confirm the CPU is working or not.If CPU is
working ,then checking the signal channel. Signal channel has been divided into two
parts, general video channel(including antenna, AV, S-terminal input, Y, Cb, Cr) and
HDTV channel (Includi ng Y Pb Pr and RGB). I f no any picture disp lays or bad code disp lays
when switching between these two channels, control signal may be wrong. Please use
oscilloscope to check test point DEN, DVS, DHS and DCLK from end to front to find
whether waveform displayed on the oscilloscope or not, if not, check if fault solder
or short circuit happ ened.If just picture color has problem, sw itch INPUT to RGB inp ut,
then input R, G, B mon ochrome signal separately from computer to find the problem col ors.
Check data line of XS504 with oscilloscope according to the above form to find it’s
problem.

DCLK Waveform

DEN Waveform

DHS Waveform

DVS Waveform

4.3.10 If only one channel has problem check the signal of this channel normal or
not.AV1,AV2,S-Video,Y,Cb,Cr are inputted from analog signal board to digital signal
board RGB Y Pb Pr(digital signal board)are input N407 by N603.Using oscilloscope

to check ICN1003’s output signal TV-Y,TV-Cb,TV-Cr,TV-HS,TV-VS(1 3 5 7 8pin of

XP1005),to verify the waveform is right or not.If not ,check whether fault soldered
or short circuit are happened Else ,check the 5V supply voltage of N601,N603 on digital
signal board As the Above order we may find the problem of RGB Y Pb Pr video signal

Output a color bar signal to AV1 by signal generator PM5518,check the waveform

if normal or not with oscilloscope.

CVBS color bar Wave form

TV_Y Waveform XP 10 05 ’s1Pin

TV_ Cb Waveform XP1005’s3Pin

T V_ Cr Waveform X P10 05 ’s5 Pin

TV _H s Waveform X P10 05 ’s 7 Pin

T V_V s Wavrform XP1005’s6Pin

4.4 Analog signal board

4.4.1 Analog signal board power part
Analog signal board is supplied by 12V transformed to 5V by N1101,N1815 After

connecting the power ,check the voltage of N1101’s 2 pin with multimeter to see if
the voltage of C1809 ‘s anode is right(about 5V) or not This is the back-end IC’s
normal power supply.

4.4.2 IF channel AFC adjustment on analog signal board
Input a 38MHz IF Signal generated from TV signal generator to

RF TUNER according IF cable whose one side to 11 pin of RF TUNER and the other to 3 pin
of RF TUNER(GND). IF channel AFC of LC-TM2018 has been adjusted automatically by software
which may check the power supply of IF IC is normal or not See if the anode voltage
of C2224 is 5V or no t and check N1006 s 21 pin voltage is 2 .5 0.2V If not check
whether fault soldered or short circuit happened to R2029,R2030.

4.4.3 AGC adjustment on analog signal board

4.4.4 Preparation steps

4.4.5 Connect TV board whose IF has been adjusted to Power board and motherboard .

4.4.6 Set TV signal g enerator to 56 channel (855.25MHz), apply RF 62dB 3Db half color

bar signal and input it to ANTENNA INPUT of RF TUNER.

4.4.7 Adjust steps

4.4.8 Check if connections connect well, start automatic searching.

4.4.9 Press PROG.-/. button to display the channel you have received on the screen

after automatic searching finishing.

4.4.10 Press factory menu button to display factory menu on TV and select
TB1274 ,press PROG +/- button to select the tda9885 AGC item of sub-menu ,then
press volume +/- but ton to adjust the val ue until the snows ar e disappear The value
after adjusting is about 12-16 and the tuner voltage of first pin is about 2.0

0.2V.

4.5 White calibration adjustment

4.5.1 Receive black or white signal under AV or PC mode, adjusting brightness and contrast to set the

brightness to 5 Nit in dark area and 90 Nit in bright area.

4.5.2 Adjust white balance. Enter factory menu, select cal. Menu, and swap color temp item to user.

Adjust Red 0-255

Green 0-255
Blue 0-255

4.5.3 Adjust black balance. Enter factory menu, and select TB1274 Menu.

Adjust Red offset 0-127

Blue offset 0-127

4.5.4 Adjusting chromaticity coordinates of black and white to fit the requirement (X=0.304, Y=0.325),

or plug automatic calibration system to adjust white calibration automatically.