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Haier L42B1180 Service Manual

Lcd tv
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See also: Owner's Manual
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair
the product or products dealt with in this service information by anyone else could result in serious injury or death.

SERVICE MANUAL

Model No.
WARNING
©2009 Qingdao Haier Electronics Co., Ltd.
All rights reserved. Unauthorized copying and distribution is a violation of law.
Haier Group
L42B1180
MSD318QT
LCD TV
Chassis

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Summary of Contents for Haier L42B1180

  • Page 1: Service Manual

    Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death. ©2009 Qingdao Haier Electronics Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.

  • Page 2: Table Of Contents

    Chapter 1: General Information 1-1. Table of Contents 1. General Information................1-1. Table of Contents 1-2. General Guidelines 1-3. Important Notice 1-4. How to Read this Service Manual ..................3. Location of Controls and Components........... 3-1. Board Location 3-2. Main Board & AV Board 3-3.
  • Page 3 9. Trouble-shooting………….............. 9-1. Simple Check 9-2. Main Board Failure Check 9-3. Panel Failure - 02 -...

  • Page 4: General Guidelines

    1-2. General Guidelines When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.

  • Page 5: Safety Check After Repairment

    1-3-6 Safety Check after Repairment in the original positions, or whether there are the positions which are deteriorated around the serviced places serviced or not. Check the insulation between the antenna terminal or external metal and the AC cord plug blades. And be sure the safety of that. General Servicing Precautions 1.

  • Page 6: Ordering Spare Parts

    Electrostatically Sensitive (ES) Devices Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the ncidence of component damage caused by static by static electricity.

  • Page 7: How To Read This Service Manual

    1-3-8. Photo used in this manual The illustration and photos used in this Manual may not base on the final design of products, which may differ from your products in some way. 1-4. How to Read this Service Manual Using Icons: each icon is described in the table below: Note: A “note”...

  • Page 8: Speci Cations

    Service Manual Model No.: 2. Speci cations Model L42B1120 Screen Size inch Aspect Ratio 16:9 Resolution 1920* 1 080 6.5 (GRAY TO Response Time (ms) GRAY) +88/-88(H), +88/-88 Angel of View (V) Typ. Color Display 16.7M Cable :1-135/ Air: No. of Preset Channels 2-69(ATV&DTV) OSD Language English...

  • Page 9: Location Of Controls And Components

    3. Location of Controls and Components 3-1 Board Location B Board A Board Description A Board Main Board B Board Power Board 3-2 Main Board - 08 -...

  • Page 10: Function Description

    3-2-1 Function Description: Main Board Process signal which incept from exterior equipment then translate into signal that panel can display. 3-2-2 Connector defnition Main board connector Power connectors (J15 J16) Pin number Signal name Pin number Signal name high voltage POWER ON/OFF +5VSTB +12V...
  • Page 11 remote connector (J6) Pin number Signal name Description LED_R LAMP RED LED_G LAMP GREEN REMOTE CONTROL POWER FOR REMOTE Keypad and connector (J7) Pin number Signal name Description KEY1 KEY0 - 10 -...

  • Page 12: Power Board

    Speaker connector J11 Pin number Signal nameD escription 3-3. Power Board 3-3-1 Function Description: Supply power for Main board, Panel. Pin number Signal name Pin number Signal name POWER ON/OFF +5VSTB +12V +12V - 11 -...

  • Page 13: Lcd Panel

    3-4. LCD Panel T420H W 06 V2 - 12 -...
  • Page 14 3-4-1 Function Description: Display the signal. Symbol Description Symbol Description Ground Ground No connection Ground CH2_0- LVDS Channel 2, Signal 0- Reserved AUO Internal Use Only CH2_0+ LVDS Channel 2, Signal 0+ Reserved AUO Internal Use Only CH2_1- LVDS Channel 2, Signal 1- No connection CH2_1+ LVDS Channel 2, Signal 1+...

  • Page 15: Disassemble And Assemble

    4. Disassemble and assemble 4-1 Remove the Pedestal 4-3. Remove the adhesive tape (The location of the adhesive tape as follows) Remove the adhesive tape indicated on the faces upward 4-2Remove the Back Cover unit. - 14 -...

  • Page 16: Remove The Terminal Bracket

    4-3 Remove the Terminal Bracket 4-5 Remove the Main board 4-4 Remove the power module J6 J7 J9 J15 J16 J11 CN513 - 15 -...

  • Page 17: Remove The Speaker

    4-6 Remove the speaker 4-7 Remove the remote control Remove the screw, take out the remote Take out the speaker control board 5. Installation Instructions 5-1 External Equipment Connections Accessories POWER MUTE MTS/SAP RECALL MENU SOURCE ENTER EXIT TV DISPLAY AUTO ASPECT SLEEP...
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  • Page 21: Hdmi Connections

    5-2 HDMI Connections When the source device(DVD player or Set Top Box) supports HDM How To Connect 1. Connect the source device to HDMI port of this TV with an HDMI cable(not supplied with this product). 2. No separated audio connection is necessary. How To Use If the source device supports Auto HDMI function, the output resolution of the source device will be automatically...
  • Page 22 Cable sample HDMI Cable (not supplied with the product) HDMI to DVI Cable ( not supplied with the product) Analog Audio Cable (Stereo to RCA type) (not supplied with the product) Connecting Headphones You can connect a set of headphones to your set if you wish to watch a TV programmer without disturbing the other people in the room.
  • Page 23 Power source TO USE AC POWER SOURCE Use the AC polarized line cord provided for operation on AC. Insert the AC cord plug into a standard polarized AC outlet. NOTES: Use the attached power cord only. electrician replace the obsolete outlet. simply unplug the unit from the AC outlet and plug it back in.

  • Page 24: Operation Instructions

    6. Operation Instructions Basal information 6-1 Front panel controls 6.2 Back panel controls - 23 -...

  • Page 25: Universal Remote Control

    6-3 Setting Up Your Remote Control - 24 -...

  • Page 26: Electrical Parts

    7. Electrical parts 7-1. Block diagram Headphone Coaxial MSD318QT Main IC - 25 -...

  • Page 27: Circuit Diagram

    7-2. Circuit Diagram - 26 -...
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  • Page 30 R192 10K R192 10K R193 10K R193 10K V800AA V800AA V800AA V800AA - 29 -...
  • Page 31 7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 8 6 4 2 8 6 4 2 8 6 4 2 8 6 4 2 8 6 4 2 8 6 4 2 7 5 3 1...
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  • Page 34 R145 R145 R144 R144 R143 R143 - 33 -...
  • Page 35 R145 R145 R144 R144 R143 R143 - 34 -...

  • Page 36: Wiring Connection Diagram

    7-3 .Wiring Connection Diagram NO.N Connection Wire(For Speaker) Connection Wire(Power For Mainboard) LVDS Wire Connection Wire(For SIDE AV INPUT) Connection Wire(Control for USB INPUT ) Connection Wire(For Keyboard) Connection Wire(For Remote) Connection Wire(Power For the Power Module) Connection Wire(Control for Backlight on/off) - 35 -...

  • Page 37: Tv Operation

    8. TV OPERATION - 36 -...
  • Page 38 - 37 -...
  • Page 39 Press ENTER Key To Select - 38 -...
  • Page 40 Press ENTER Key To Select - 39 -...
  • Page 41 - 40 -...
  • Page 42 8.1 How to enter into the factory model 1. You can press "source-2-5-8-0" to go into factory setting. Presse the key "exit" to shut the factory setting. Content: 1: ADC setting: set ADC value of YUV,VGA. It can also be auto-set. Adopt 100% color bar to yuv and Checkerboard signal to vga.
  • Page 43 8.2 How to update software Haier MSD318QT F/W upgrade with USB SOP Step 1: Ready for F/W Upgrade 1.1 Prepare a USB memory . from computer’s USB port! Step 2: F/W Upgrade 2.1 AC ON 2.2,Then input USB, press POWER.

  • Page 44: Trouble-Shooting

    9. Trouble shooting 9-1. Simple check - 43-...

  • Page 45: Main Board Failure Check

    9-2. Main board failure check Service guide 1) Black creen Is power LCD normal? Check Q2,Q3 and the 2) White screen on VCC pins of J9 Check if Q31 is working Signal on J9 Check if J9 is - 44 -...
  • Page 46 3) Panel display abnormally connector J9 is at normal level - 45-...
  • Page 47 4) No sound No sound Check the input Check if there is sound input source signal Check if the volume control is Reset at 0 level or muted volume Check the Check if there is output at J 1 1 speakers Check if the power supply Check if there is +12V input at...
  • Page 48 5 TV failure TV no channel Fix the RF Check if there is RF signal input Check the power Check if there is supply circuit to +5V at PIN2 of this PIN Check if there is I2C signal at PIN6 & Check if there is PIN7 of TUNER1 intermediate...
  • Page 49 6) HDMI no picture or picture abnormal If CN10 is R111,R112,R113,R114,R116, R301,R310,R319,R317, R351,R338,R343 R117,R100,R105,R106,R108. Q305 Q11,Q12 - 48 -...
  • Page 50 7) PC no picture or picture abnormal - 49 -...
  • Page 51 8) YPBPR, AV no picture or picture abnormal Check Y - 50 -...
  • Page 52 Failure Mode Part Name Description Phenomena Failure cause White Screen B/L normal, only white screen display M a y b e c a u s e d by surge current Black Screen B/L normal, and EDS only Black screen display FIIcker Crosstalk Vcom imbalance...
  • Page 53 Part Name Description Phenomena Failure cause I n c o m i n g I n s p e c t i o n Standard Bright dot dark dot in Dot Defect pannel Bladder between Polarizer and top glass Polarizer Bubble Bladder in Polarizer P a n e l o r Tine or rigidity arose...

  • Page 54: Panel Failure

    9-3. Pannel failure Failure Mode Part Name Description Phenomena Failure cause Block Defect :TCP cracking or cracking Dim or L/D :TCP Sunken V B/D Vertical bar :TCP lead cracking :ACF bonding short :Awful environment and something electric enter V Dim Vertal gray line into LCD :Mis-align between TCP and...
  • Page 55 Failure Mode Part Name Description Phenomena Failure cause Mechanlcal When Caused Nolse turn panel,appear b y M e c h a n i c a cacophony noise of backlight unit Ripple Connectric circle Causeed by between mechanism and pannel B/L off B/L lose action *Connect badness...
  • Page 56 Failure Mode Part Name Description Phenomena Failure cause Brightness B/L unit badness at bottom of LCM Light leakage brighter than normal B / L b r i g h t n e s s Sheet in B/L unit Mechanlcal or B/ asymmetric is uneven Uniformity...
  • Page 57 Sincere Forever Haier Group Haier Industrial Park, No.1, Haier Road 266101, Qingdao, China http://www.haier.com Printed in China...

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