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KONKA
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KDL37AT23U
Schematic
20 pgs1.2 Mb0

KONKA KDL32AT23U, KDL37AT23U, KDL42AT23U Schematic

LCD TV SERVICE MANUAL
Model list
KDL32AT23U KDL37AT23U KDL42AT23U
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.
A. SPECIFICATION
Color System : NTSC_M、ATSC/Free QAM Sound System : BTSC/SAP Frequency range: Antenna(2~69)、Cable(2~135) Audio output power 10%THD 10W X 2
Antenna Impedance 75Ω(Unbalance) Power Consumption 180W(32”)，200W(37”),290W(42”)
Power Supply : AC~110-240V, 60Hz
item Port list
1 2 3
4 5 6
7 8
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) TV Video Signal Generator (FLUKE PM54200) 1 set
6) ATSC signal Generator (SFU) 1 set
4 Factory mode adjustment
4.1 Enter factory mode adjustment
RF ANTENNA & Cable Scart Composite Scart S_VIDEO Y(CVBS)、Cb/Pb、Cr/Pr
VGA HDMI
SPDIF(OUT) AC Input
ADJUSTMENT MANUAL
Using the remote control, press INPUT button once first , then press “2580”
Connect Power to check if Power LED
digital keys , and you can see manufacture menu on the LCD panel.
4.2 factory menu operation method Press the “ . ” key to select the page. Press the “▽△” to select the item you
desired change, and press the “< >” to set the value.
4.3 exit the factory menu Press “Exit” to exit the factory menu , the value you have changed will be
save automatically.
4.4 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“ . ”button to select the page adjusting White calibration , Press the “▽△” to select the item you desired change, and press the “< >” to set the values as follow.
Red Offset 1000 Green Offset 1000 Blue Offset 1000
3 Then adjusting “Red gain、Green gain、Blue gain” to adjust the chromaticity coordinates of black and white to fit the requirement.
ITEM
Program
Menu.
M/B Voltage
confirmation
Update FLASH
Update HDMI EEPROM
1.
2.
3.
Tool
Equipments
Digital Multimeter
PC
Debug
PC,ALL-11 Debug
Tool、HDMI Cable
Requirements Procedure and SPEC
displays the green light.
1.Enter User menu, Check if the pictureis
is
to
if the
720p/1080i DVD
to
if the
if the
or
or
if the output
Signal
4.
TV mode
check
Factory TV Signal or TV Signal Generator
Out NTSC Signal
normal, no Signal background is blue . no Signal is would several minutes enter
standby state.
2. Check Auto Scearch / Management、etc
right or not.
5.
6.
7.
8.
9.
VIDEO check
Y,Cb,Cr(480I)
Y,Pb,Pr SDTV: 480P HDTV: 720p/1080i
VGA INPUT
HDMI check
DVD Video Cable
DVD Component Cable
Player
HDTV Receiver ATSC HDTV Tuner Component Cable
PC VGA Cable TV BOX D-SUB Cable
SAMSUNG DVD-HD948
Gdbbk DVD （
HDMIofDVD） HDMI Cable
Play DVD Set DVD interlaced output
Play DVD Set DVD
interlaced output（Y,Cb,Cr）
Play DVD SDTV/HDTV (Y,Pr,Pb)
PC Mode
HDMI Mode
Screen is clear and fluent, Audio checks output is normal。
Screen is clear and fluent, Audio checks output is normal。
Screen is clear and fluent, Audio checks output is normal。
Apiece Mode.Screen is clear and fluent。
1.Select “SOURC”Eand Select “HDMI”
2.Apiece Mode:Screen is clear and fluent, Audio checks if the output is normal。
Gdbbk DVD （
10.
11.
HDCP check
remote control
function check
HDMIofDVD） HDMI Cabl VGA859
PC 、 DVD Pattern Generator
TV Generator
HDTV Player
TV or play DVD IN
Select “SOURCE”and Select “HDMI”
check Signal Generator output
HDMI/HDCP Signal, checks
is”PASS”
Check if the apiece mode function normal。
Key IC list
Item P/N Type Circuit No. Qty.
1 19006050 SVPEX-52 U9 1 2 19005519 HIDTV-EX8060 U15 1 3 19006052 HY5DU561622ETP U16,U17 2 4 19005461 HY5DU281622ET U501,U502 2 5 19006051 JS28F640P30B85 U20 1 6 19005530 RTL8139D U24 1 8 19005522 SIL9011 U11 1
10 19005910 MSP4440 N705 1
Trouble Shooting
Preparing to bring-up the System
Step1:Check if there is any power (12V, 5V, 5VSB, 3.3V, 2.5V, 1.8V,…) shortage
before power up refer to circuit diagram.
Step2:Turn on power supply and measure all power levels: 12V, 5V, 5VSB, 3.3V,
2.5V, and 1.8V refer to circuit diagram.
Step3: Measure all clock signals
14.318 MHz(Y4) RTC 32.768 KHz crystal is sine wave with 0.5V P-P(Y3).
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