KONKA KDL-26BZ31U Schematic

LCD TV SERVICE MANUAL

Model list

KDL26BZ31U
KDL32BZ22U
KDL32BZ23U
KDL32BZ25U
KDL32BZ25U-A
KDL32BZ31U
KDL37BZ23U
KDL37BZ25U
KDL37BZ25U-A
KDL37BZ31U
KDL42BZ23U
KDL42BZ31U
KDL42BZ25U-A

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 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 220V/110V, 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

Color System : NTSC_M、ATSC/Free QAM
Sound System : BTSC/SAP
Frequency range: Antenna(2~69)、Cable(1~135)
Audio output power 10%THD 5W X 2
Antenna Impedance 75Ω(Unbalance)

Power Consumption 160W(26”)，180W(32”)，195W(37”)，290W(42”)
Power Supply : AC~110-240V, 60Hz

item Port list

1
2 HDMI 1
3 HDMI 2

RF Antenna & Cable

4
5
6

7
8

9

10
11

12
13
14
15

VGA
Headphone Audio Output
VGA Audio Input

Component1/Y1、Pb1、Pr1
Component2/Y2、Pb2、Pr2
Component1 Audio Input

Component2 Audio Input
Composite

Composite Audio Input
S-Video

Audio Output
SPDIF Output

B. Adjustment Manual

1. Test notes

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.
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 equipments

1) Computer 1

2) Multimeter (VICTOR VC9801) 1

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

4) ATSC signal Generator(SFU) 1

5) TV Video signal generator (FLUKE PM54200) 1

6) Color Analyzer(KONICA MINOLTA CA210) 1

4. Factory mode adjustment

4.1 .The way to enter factory menu

Press “Menu” button and then press “Pre.Ch” button five times, you can enter the factory
menu, and the software version information is shown in the last line.

4.2 .The way to exit factory menu

Press “Exit” to exit the factory menu ,the value you have changed will be save automatically.

4.3. factory menu operation method

Press the “▽△”to select the item you desired change, and press “OK” to set the value.

4.4. White calibration adjustment

4.4.1 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.

4.4.2 Adjust white balance. Enter factory menu, select “White Blance” item, enter to the
White Balance Adjust Menu.

Adjust WBRO 0-100
WBGO 0-100
WBBO 0-100
WBRG 0-100
WBGG 0-100
WBBG 0-100

4.4.3 Adjusting chromaticity coordinates of black and white to fit the requirement.

Cool(9300K) x=0.283±0.015 , y=0.297±0.015

Normal(7500K) x=0.299±0.015 , y=0.315±0.015
Warm(6500K) x=0.313±0.015 , y=0.329±0.015

4.5. Gamma Table Loading

Enter factory menu, select “White Blance” item, and press “OK” to set the value.

4.6 . Burn on

When source is in TV mode, select the item of “Burn On” in factory menu, keep the state for
“On” by pressing “OK” button. After putting on the burning switch, the TV set will be boot up
straightly and keep in the snowflake burning on state if you put on the power supply. Here, the
function that auto power-off after in 15 minutes while no signal input will be invalid. When the
burning on finished, please change the “Burn on” state to “Off”.

4.7 . No Signal Time off

Select the item of “No Signal Time off” in factory menu, press “OK” to set the value
(2/5/10/15 minute), the default value is 15 minute.

4.8. Parameters Setting

Select the item of “Parameters Setting” in factory menu, press “OK” to enter Parameters Setting
Menu. Then you can set some value for volume and image features.

4.9 Auto Color

Select the item of “Auto Color” in factory menu, press “OK” to start auto adjust the color.

4.10 Advanced Video Menu

Select the item of “Advanced Video Menu” in factory menu, press “OK” to enter Advanced
Video Menu. Then you can set some value .

4.11 AGC

Select the item of “AGC” in factory menu, press “OK” to set the value (0/1/2/3/4/5/6), then
choose the value for the best image effect.

4.12 Pre-Channel Setting

In factory menu, select the item of “Set Default Channel”， and press “OK” button.

4.13 Software Resetting

In factory menu, select the item of“Set Default Value” , press “OK” button，and turn off
TV, then turn on. This operation can clean up all data that modified by users, and make the data

go back to default settings.

5. other adjusting

Item

Prog

Menu

M/B

1

Voltage
confirmation

Update

2

FLASH

Update

3.

HDMI
EEPROM

4

TV mode
check

Equipments Requirements Procedure and SPEC

Digital

Multimeter

PC Debug Tool

PC, Beeprog,
Debug Tool 、
HDMI Cable

Factory TV Signal
or TV Signal
Generator

Connect Power to check

Out NTSC Signal

if Power LED displays
the green light.

1.Enter User menu,
Check if the picture is
normal, no Signal
background is black . no
signal is would several
minutes enter standby
state.

5.

VIDEO
check

DVD Video Cable

Play DVD Set
DVD to interlaced
output

Screen is clear and fluent,
Audio checks if the

output is normal 。

Y, Pb, Pr
SDTV:

6

480P
HDTV:
720p/1080i

7

VGA
INPUT

HDTV Receiver
ATSC HDTV
Tuner Component
Cable

Play DVD
SDTV/HDTV (Y,
Pr, Pb)

PC VGA Cable
TV BOX D-SUB

PC Mode

Cable

Screen is clear and fluent,
Audio checks if the

output is normal 。

Apiece Mode. Screen is
clear and fluent。

8.

9

HDMI
check

HDCP
check

SAMSUNG
DVD-HD948

DVD （or HDMI
of DVD ） HDMI

Cable

DVD （or HDMI
of DVD ） HDMI

Cable , VGA859

HDMI Mode

1.Select “SOURCE” and
Select “HDMI”2.Apiece
Mode: Screen is clear and
fluent, Audio checks if

the output is normal 。
Select “SOURCE” and

Select “HDMI” check
Signal Generator output
HDMI /HDCP Signal,
checks if the output
is ”PASS”

C. Key IC list

Item P/N Type Circuit No. Qty.

1 32001649 FQD1236/F N101 1
2 19006243 S29GL032A90TFIR4 N001 1

3 19006052 HY5DU561622ETP
4 19006246 P89V51RB2FA N004 1

5 19006244 CAS-220/CSO-LQFP100-Zoran N102 1
6 19006247 PT2313L-SOP28 N203 1
7 19003653 BA09FP-TO252-3-ROHM N204 1
8 19006300 MST9883B-2-LF-110-LQFP80-MSTA N301 1

9 19003889 SN74CBT3257DBQR-CU257

10 19006245 ZR39660BGCG-BGA400- N401 1
11 19003312 24LC21A-PDIP8-MICROCHIP N607 1

12 19005679 MP1430-SOIC8-MPS
13 19005236 AZ1117H-2.5TR-SOT223-AAC N803 1
14 19005010 AZ1117H-3.3TRE1-SOT223-BCD/#

N002
N003

N302
N303
N306

N801
N802

N804
N805

2

3

2

2