KONKA KLC-1508US Schematic
LCD TV SERVICE MANUAL
Model list
KLC-1508US
KLC-1521US
KONKA GROUP CO,LTD.
Digital Flat Display Division
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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.
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A. SPECIFICATION
System : NTSC-M
Channel : Antenna 2-69
CATV 1-125
IF Frenquency Video： 45.75MHz
Sound： 42.17MHz
Chroma： 41.25MHz
Audio output power 10%THD 1W X 2
Antenna Impedance 75Ω(Unbalance)
Power Consumption 36W
Power Supply : AC~100-240V,50/60Hz (Adapter)
DC12V 3A（TV）
item Port list （KLC-1508US）
1 RF cable
2 Video and Audio
3 S-Video
4 Headphone audio output
5 DC 12V input
item Port list （KLC-1521US）
1 RF cable
2 Y 、Pb /Cb、Pr /Cr
3 Audio2(Y、Pb/Cb、Pr/Cr Audio input)
4 VGA
5 Audio3（PC Audio input）
6 Video and Audio1
7 S-Video
8 Headphone audio output
9 DC 12V input
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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) 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
4 Factory mode adjustment
4.1 Enter factory mode adjustment
Using the remote control, press Menu button once first , then press PRE.CH(or named
RECALL) 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、RGBTemp、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 “RF AGC” ，then use VOL+/- to adjust the item until the voltage of Pin
1 of N100 to be about 2.5V±0.2V,then noise wave of the picture point disappears.
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4.5 White calibration adjustment
CVBS,S
-
Video
PWRON
DDC/HWI2C
BKLON
VCC
-
5Ua VCC
-
3.3VUSB
VCC+1.8a
VCC+1.8b
TDA1517
UOC_R,G,B
Y_G
DDC/HWI2C
To N401
SDA
SCL
VGA
-
DAT VGA
-
CLK
VGA_R,G,B
VGA_Hs,Vs
VCC
-
PAN
(Only for KLC
-
1521US)
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=0.285,
Y=0.293), or plug automatic calibration system to adjust white calibration automatically.
BLOCK DIAGRAM
Signal Block Diagram
N100
Tuner
+12V
Supply
Earphone
speaker
Port
VG
A
AGC
port
Y
Pb
Pr
T101
M3953
T102
M9352
Audio
N201
+12V
Supply
Audio 2
L,R
Y,Pb/Cb,Pr/Cr
VGA
Audio IN
VIF
SIF
AMP_L
AMP_R
AU2IN_L,R
AU3IN_L,R
Audio L,R
TDA15001H
N303
PI5V330
Pb_B
Pr_R
N301
PI5V330
N401
MAIN IC
YUVHs
YUVVs
N501
MST518
M_Rst
M_CLK
M_SDA
M_CS
LED R,G
KEY B1、B0
IR
LCD
PANEL
3.3V Supply
2.5V Supply
N302
24LC21
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