KONKA KLC-2722US Schematic

LCD TV SERVICE MANUAL

Model list

KLC-2722US KLC-3211US KLC-3222US

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. Those who are thoroughly familiar with precautions necessary when working on high voltage equipment should only perform work on these models.

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 chass is.

When it is necessary to make measurements or tests with AC power appl ied to the r eceiver 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 rep laced only with exact factory recommended replacement parts. The use of unauthorized substitute par ts man creates may create shock, fire, or other haz ar ds .

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, isol ation resistor-capacitor networks, mechanical insulators etc.

3. To be sure that not shock hazard exis ts, a check for the presence of leakage cur rent 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 110-2 4 0V~ 50/60HZ, AC receptacle. (Do not use an Isolation Transformer during these checks.) All checks must be repeated with the AC line c ord 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 electricity because it contains high voltage.

A. SPECIFICATION

Panel Name:CMO(27’’),CPT(32’’)

Color System : NTSC 、PAL Sound System : M/N、

Frequency range: 55.25M~805.75M IF Frenquency Video：45.75MHz

Sound：41.25MHz

Chroma：42.17MHz Audio output power 10%THD 4W X 2 Antenna Impedance 75 Ω(Unbalance) Power Consumption 160W(27’’) , 180W(32’’) Power Supply : AC~110-240V,50/60Hz

INPUT Source :

Inputs &

Signals Video Format Outputs TV

VIDEO1 Video CVBS RCA VIDEO2 Video CVBS RCA VIDEO output Video CVBS RCA S-VIDEO S-VIDEO Y/C Mini Din 4 Pin YPbPr1

Analog TV

Component

(Y, Pb/Cb, Pr/Cr)

NTSC F Type

480i, 480p, 720p, 1080i RCA

Connector types

VGA DVI DVI Digital RGB DVI 24 Pin

2AUDIO output /1 AUDIO

output

Headphone

AC IN

VGA

L/R Audio

L/R Earphone

AC Power IN

Analog RGB D-SUB 15 Pin

STEREO

AC 110~240V YC14

Mini Din 7Pin

Front Panel Function Control Description

Note:

1. When connect the TV S-Video to DVD or other equipment’s S-Video, you need to connect TV Audio 1 input to DVD or other equipment ’s Audio output.

2. When connect the TV Component, VGA, DVI, Video2 to other equipment’s Component, VGA, DVI, Video2, you need to connect TV Audio 2 input

to other

equipment’s Audio output.

ADJUSTMENT MANUAL

Ⅰ. TEST NOTE

. Please follow the pointed test steps and choose the right test equipment to

conduct adjustment, otherwise good effect of Unit could not be obtained. The unit should be warmed up for 30 minutes before adjustment and every parameter should be adjusted repeatedly till the optimum value obtained, the pointed voltage value should be ensured during test to get satisfied test result.

2. Test environment

1) Temperature ： 15°C-35°C

2) Relative Humidity : 45-75%

3) Air pressure : 86-106Kpa

3 Test equipments（The following equipment should be calibrated before testing）

1) Computer 1 set

2) Multi-meter (VICTOR VC9801) 1 set

3) Video Signal Generator (Chroma Model 2227/2327) 1 set

4) Color Analyzer (Chroma Model 7120 ) 1 set

5) DDC card (DYNACOLOR, INC D8330) 1 slice

6) TV Video Signal Generator (FLUKE PM54200) 1 set

7) AV,VGA, YPbPR/YCbCr,DVI Signal line etc 1 set

4 Factory mode adjustment

4.1 Enter factory mode adjustment Using the remote control, press Menu button once first , then press

RECALL (or named PRE.CH) button five times, and you can see manufacture menu on the LCD panel.

4.2 factory menu operation method Press the channel +/- button to selection the sub menu of factory menu

（including F、E、UOCⅢ、Temp）, and press the vol+ to enter the sub menu and setting the value.

4.3 exit the factory menu Press the MUTE button again and again or turn off the TV, it can exit the

factory menu.

4.4 AGC adjustment In TV mode,Receive 60dB split field signal. Enter factory mode menu

“UOCⅢ” item,press”CHAN▽” to select “AGC” ，then use VOL+/- to adjust the item until the voltage of Pin 1 of N100 to be about 2.5V±0.2V,or the noise in

Earphon

the picture disappears.

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 “RECALL”

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=0.283,Y=0.297), or plug automatic calibration system to adjust white calibration automatically.

BLOCK DIAGRAM

N200 TDA1

517

speaker

+5V Supply

N100 Tuner

AGC

Audio N201 TDA8944

+12V Supply

T101 M3953

T102 M9352

CVBS and SCART

VIF

SIF

AMP_L

AMP_R

AU1IN_L,R

N401

MAIN IC

TDA15011H1/

N1C80

LED R,G

KEY B1、B0 IR

PWRON DDC/HWI2C BKLON

VCC8V

VCC-5Ua

VCC-3.3VUSB

VCC+1.8a VCC+1.8b

port Y Pb Pr

Port

VGA

Audio1(forAV1) Audio2(for A v2)

Y,Pb/Cb,Pr/Cr

Port DVI

VGA_R,G,B VGA_Hs,Vs

UOC_R,G,B

N303

PI5V330

Y_G Pb_B Pr_R

YUVHs YUVVs

N501

MST519

M_Rst M_CLK M_SDA M_CS

VCC-PAN

LCD

PANEL

VGA-CLK VGA-DAT

N301

PI5V330

SCL SDA

To N401

N302

24LC21

3.3V Supply

2.5V Supply

DDC/HWI2C

Signal Board Power Diagram

XS 80 4

F802

Vcc_5v

For

Vcc_U

L809

Vcc 5v

N803

9435A

F801

INVERT

TDA8944J

Vcc 12

N860

9435A

N200

TDA1517

N201

12V

FOR

N401

Vcc 12

N804

1117-3.3

N805

1117-2.5

N806

1117-3.3

FOR

VCC-3.

FOR

N501

VCC-CO

FOR

N501

VCC-3.3U

FOR

+ 14 hidden pages

KONKA KLC-2722US Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual