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Page 1: Logik KLC-1521QS

LCD TV SERVICE MANUAL

Model list

KLC-1521QS

KONKA GROUP CO,LTD. Digital Flat Display Division

Page 2: Logik KLC-1521QS

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.

Page 3: Logik KLC-1521QS

A. SPECIFICATION

System : PAL- D/K,I,B/G;SECAM-L/L’,B/G,D/K Channel : 45.25MHz~855.25MHz IF Frenquency Video: 38.9MHz

Chroma: 34.47MHz Sound: 32.4 MHz(DK) 33.4MHz(BG) 32.9 MHz(I) Audio output power 10%THD 1W×2 Antenna Impedance 75Ω(Unbalance) Power Consumption 36W Power Supply : AC~100-240V,50/60Hz KLC-1521QS

item Port list 1 RF cable 2 SCART 3 PC VGA input 4 Y、Pb/Cb、Pr/Cr 5 Video 6 Audio input 7 Headphone audio output 8 Power port

Page 4: Logik KLC-1521QS

ADJUSTMENT MANUAL

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 86KPa~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 RECALL button five times,and you can see manufacture menu on the LCD panel. 4.2 Factory menu operation method Press the PROG / 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 PROG / 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. 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 15Nit in dark area and 90 Nit in bright area. 4.5.2 Adjust white balance.Press MENU button once, then press RECALL button five times to enter factory menu, select “Temp” Menu, Adjust Red 0-100 Green 0-100 Blue 0-100 4.5.3 Adjusting chromaticity coordinates of black and white to fit the requirement, or plug automatic calibration system to adjust white calibration automatically.

Page 5: Logik KLC-1521QS

BLOCK DIAGRAM

X102 M9453

X101 M3953

N100 Tuner

AGC

SIF

VIF

Audio N201 TDA1517

Audio 2 L,R

VGA Audio IN

port Y Pb Pr

UO

Port VGA

D

VGA-DAT

VGA-CLK

+12V Supply

Earphone

speaker

AMP_L

AMP_R

+12V Supply

AU2IN_L,R

AU3IN_L,R

VGA R,G,B VGA Hs,Vs

Y,Pb/Cb,Pr/Cr

Signal Block Diagram

SCART CVBSSCART RGB AUDIO L,R

N401

MAIN IC

TDA15021H

KEY B1、B0 IR

PWRON

DDC/HWI2C

BKLON

VCC-5Ua VCC-3.3VUSB VCC+1.8a VCC+1.8b

3.3V Supply 2.5V Supply

N303 PI5V330

C R,G,B

YUVHs YUVVs

M_Rst M_CLK M_SDA M_CS

N501 MST518

Y_GPb_B Pr_R

DC/HWI2C

LCD

PANEL

N301 PI5V330

N302 24LC21

To N401

SDASCL

LED R,G

VCC-PAN

Page 6: Logik KLC-1521QS
Page 7: Logik KLC-1521QS

IC BLOCK DIAGRAM 1 N401(TDA15021H1)

2 N501 (MST518)

Page 8: Logik KLC-1521QS

Trouble Shooting

Key IC list

Item Type Maker Package Circuit No. Qty.

1 TDA15021H1 Philips QFP128 N401 1 2 MST518 MSTAR PQFP160 N501 1 3 24LC32A MICROCHIP SOIC-8 N402 1 4 24LC21A MICROCHIP SOIC-8 N302 1 5 MP1410ES-SOIC-8 MPS SOIC-8 N801,N802 2 6 FDS9435A FAIRCHILD SOIC-8 N803 1 8 TDA1517 PHILIPS SIL9MPF N200 1

FSAV330 FAIRCHILD9 TS5V330 TI

TSSOP-16 N301 1

11 1117-3.3V BCD SOT223 N804,N806 2 12 1117-2.5V AAC SOT223 N805 1 14 Tuner AFT1/3100G Qingjia N100 1

Start order:

Turn on the power

N401 RESET and IO port initialize

N501 electrify ,reset, initialize

Turn on back light lamp

Successful start and LCD display

1)Verify the state of TV set.Please switch the TV on ,then verify the LED color. Red is

standby state and green is working state.

2)Checking Supply Power.If the color of LED is yellow,the power supply for signal board 。

N801 supply 5V and N802 supply 3.3V,N804、N806 supply 3.3V power(Test the PIN 2).N805

supply 2.5V(Test the PIN 2),D803 supply 8.3V,V401 and V402 supply 1.8V. All these are

for main IC N401,N501. 3)After turning on the power, if blank screen appears (no back light lamp), just press POWER button several times, if blank screen still there.Check if the voltage of every power supply is normal. 4)Check if the crystal oscillator X501(14.318180MHz) X401(24.576MHz) oscillate or not, and oscillate frequency is right or not. 5)Back light control signal (BKLON) of XS801 has high level (about 2.5V) or not, if not, check whether fault soldered or short circuit happened。 6) If back light lamp is on while there is no display,check N407 and N501’s reset circuit and the output of the oscillator to confirm the CPU and SCALER are working or not.If RGB is abnormal,check N501;If RGB is working correctly and the other channel is abnormal ,please check N501.

Page 9: Logik KLC-1521QS

PDF 文件以 "PDF 制作工厂" 试用版创建 À http://www.fineprint.com

Page 10: Logik KLC-1521QS

PDF 文件以 "PDF 制作工厂" 试用版创建 À http://www.fineprint.com

Page 11: Logik KLC-1521QS

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Page 12: Logik KLC-1521QS

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Page 13: Logik KLC-1521QS

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1 2 3 4 5 6 7 8 910

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13

14

15

16

17

18

19

20

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24

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Page 14: Logik KLC-1521QS

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Page 15: Logik KLC-1521QS

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Page 16: Logik KLC-1521QS

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Page 17: Logik KLC-1521QS

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54

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