KONKA 26AS21U, 26AS22U, 32BS22U, 32AS21U, 32AS23U Schematic

LCD TV SERVICE MANUAL

Modle list

KL26AS21U,KL26AS22U,KL32BS22U

KL32AS21U,KL32AS23U,KL37AS23U

KL37BS22U,KL37AS21U,KL40AS11U

KL40AS21U,KL42AS11U,KL42AS23U

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, mechanica l insulat ors 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 : PAL：M，N；NTSC：M

Channel :

AIR:

L-VHF:2～6 55.25MHz～83.25MHz
H-VHF:7～13 175.25MHz～211.25MHz
UHF :14～69 471.25MHz～801.25MHz

CABLE:

2～G 55.25MHz～157.25MHz
H～CCC 163.25MHz～451.25MHz

DDD～125 457.25MHz～801.25MHz

Audio Output Power :

Size 26 32 37 40 42

Power(W) 4W*2 4 W*2 5W*2 5 W*2 5 W*2

Antenna Impedance : 75Ω

Power Consumption : 340W（Max）

Size 26 32 37 40 42

Power

160

180

195

270

270

Consumption(W)

Power Supply : ~110－240V, 50/60Hz

Item

1
2
3
4
5
6
7

9
10
11

Port List
RF Cable

Y/Composite(V2) 、Cb、Cr（SD）

Y、Pb、Pr（HD）
VGA/RGB

VGA Audio Input
HDMI Input
V1 Input

Earphone Audio Output
S-Video Input
Component Audio Input

B. ADJUSTMENT MANUAL

Ⅰ. TEST NOTE

1. 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)VideoSignalGenerator(ChromaModel2227/2327/VG859/SFU) 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)Remote controller with factory keys 1 set
8）AV,VGA, YPbPR/YCbCr,HDMI Signal line etc 1 set

ITEM

f

b

1

2

3

4

Program

M/B
Voltage

confirmation

Update
NVRAM

Update HDMI
EEPROM

Update

KEY

HDCP

Equipments

Digital Multimeter

PC

Debug Tool

PC,ALL-11

Tool、HDMI

PC,ALL-11

Tool

Debug

Cable

Debug

Requirements Procedure and SPEC

JSK3178-006
Min Board

1. Connect Power to check if Power LED

displays the green light.

2. Please refer to appendix 5.1/5.2/5.3 i
there is abnormal phenomenon.

1. Please refer to appendix 5.6 if there is
abnormal phenomenon.

1. Please refer to appendix 5.6 if there is
abnormal phenomenon.

1. Please refer to appendix 5.6 if there is
abnormal phenomenon.

Enter factory
menu

5

Update

NVRAM
explain

6

enactment

7

factory

（default）
Auto color

8

TV Signal Generator

（FLUKE PM54200

PM5418）

AV：interlaced output
PAL and NTSC

Mode, black and
white signal；

YPbPr ： interlaced
output COLOR
signal；

Enter factory menu : Please MENU

1.

button on the remote control,then
Please PRE button per 5 times。

Enter factory menu，Select “VGA IIC

1.
SELECT”

IIC：From VGA Update UOCIII NVRAM
TXRX：From VGA Update MCU

NVRAM；
DDC： From VGA UpdateDDCNVRAM；

1.Enter factory menu, Select “RESET”,
turn off the power , after be over then
supply the power again。

1.Enter factory menu, Select “Auto color”,
（NOT：after 10 seconds，factory appear
“PASS”Auto color adjustment OK；appear
“ FAIL ” Auto color adjustment

defeated，then again adjustment。）

e

VGA ： interlaced

Color Temp.
adjust

9

white-balance
calibrate

1After Color Temp adjustment OK，Can’t”
Auto Color”

again。

a.AV :Color
Temp and

white-balance
calibrate adjust

TV Signal Generator
Color Signal

Generator

Enter black and
white signal

1.Enter factory menu, Select “USER
RGB”,

Adjustment B-R/G/B,

chromaticity

coordinates of white to fit the12000

Adjustment C-R/G/B, if black calibration.

b.YPbPr: Color

Temp and
white-balance

calibrate
adjust

c.VGA Color
Temp and

white-balance
calibrate
adjust

HDTV Video Signal
Generator
VG848
Color Signal
Generator

HDTV Video Signal
Generator
VG848
Color Signal
Generator

Enter black and
white signal

Enter black and
white signal,
Enter User menu,
Select “ Color
Temp.

1.Enter factory menu, Select “USER
RGB”,

Adjustment B-R/G/B,

chromaticity

coordinates of white to fit the12000

Adjustment C-R/G/B, if black calibration.

1. .Enter factory menu, Select “Color
Temp”, Select”7500”,

chromaticity

coordinates of white to fit the7500;

Select”Memory” chromaticity

coordinates of white to fit the12000.

10 TV parameter

enactment

11

12.

a.AFC Setup

b.AGC adjust

DDC

function

examination

TV mode

check

TV Signal Generator

TV Signal Generator TVEnter 60dB-90dB

PC or Pattern
Generator

Factory TV Signal or
TV Signal Generator

1. Enter User menu，Select “CHANNEL”，
Setup AFC for “ON”

Press button to display factory

1.

“half Color
BAR” 、 ”GREY”
Picture

1024*768@75Hz ；

Picture

menu on TV and select “RF AGC”,
press volume +/- button to adjust 。

2. pledge 60dB to 90dB Screen is clear and
fluent

1. DDC Tester connects with the platform
then read or writes data in EEPROM.

Affirm DDC2 content is right or not.

2.

1.Enter User menu, Check if the pictureis
normal, no Signal

snowflake points are come forth，no

Output PAL Signal

is would several minutes enter

Signal

standby state.

background the

13.

14

VIDEO check

Y,Cb,Cr(480I/
576I)

DVD
Video Cable

DVD
Component Cable

720p/1080i DVD

Play DVD
Set DVD to
interlaced output

Play DVD
Set DVD to

interlaced

2. Check Auto Scearch / Management、

1.Screen is clear and fluent, Audio checks if
the output is normal。

1.Screen is clear and fluent, Audio checks if
the output is normal。

etc is