Haier L42C300c Service Manual
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Haier L42C300c Service Manual

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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
WARNING
©2009 Qingdao Haier Electronics Co., Ltd.
All rights reserved. Unauthorized copying and distribution is a violation of law.
Haier Group
Model No. L42C300c
MST 6M48
LCD TV
Chassis

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Summary of Contents for Haier L42C300c

  • Page 1 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

    Service Manual Model No.: 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 2. Specifications..................3. Location of Controls and Components........... 3-1.
  • Page 3 Service Manual Model No.: 8. TV OPERATION..…………............8-1. How to enter into the factory model 8-2. How to update software 9. Trouble-shooting………….............. 9-1. Simple Check 9-2. Main Board Failure Check 9-3. Panel Failure - 02 -...

  • Page 4: General Guidelines

    Service Manual Model No.: 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: Table Of Contents

    Service Manual Model No.: 1-3-6 Safety Check after Repairment Confirm that the screws, parts and wiring which were removed in order to service are put 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.
  • Page 6 Service Manual Model No.: 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"...

  • Page 7: How To Read This Service Manual

    Service Manual Model No.: 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: Icons are used to attract the attention of the reader to specific information.

  • Page 8: Specifications

    Service Manual Model No.: 2. Specifications L42C300c Model Screen Size 42 inch Aspect Ratio 16:9 Resolution 1920x1080 6.5 (GRAY TO Response Time (ms) GRAY) Angel of View Color Display 16.7M No. of Preset Channels 99 OSD Language English Color System...

  • Page 9: Location Of Controls And Components

    Service Manual Model No.: 3. Location of Controls and Components 3-1 Board Location B Board A Board Part Number Description A Board Main Board DC1J A0M0106M 514C3201M23 B Board Power Board 3-2 Main Board & AV Board - 08 -...
  • Page 10 Service Manual Model No.: 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 definition Main board connector Power connectors (CN102, CN101) CN101 CN102 Pin number Signal name Pin number Signal name BL- O N/OFF...
  • Page 11 Service Manual Model No.: remote connector (CN201) Pin number Signal name Description LED_R LAMP RED LED_G LAMP GREEN REMOTE CONTROL POWER FOR REMOTE Keypad and connector (CN202) Pin number Signal name Description KEY1 KEY0 Speaker connector CN701 Pin number Signal name Description RSPK+ RSPK+...

  • Page 12: Power Board

    Service Manual Model No.: 3-3. Power Board 3-3-1 Function Description: Supply power for Main board, Panel. 3-3-2Connectordefinition CON3 CON2 Pin number Signal name Pin number Signal name +24V +24V +24V +24V POWER ON/OFF +5VSTB +12V +12V - 11 -...

  • Page 13: Lcd Panel

    Service Manual Model No.: 3-4. LCD Panel MTC420TVM-C01F(CMO:V420H2-P01) - 12 -...
  • Page 14 Service Manual Model No.: 3-5 Interface Connections Name Description Note Ground Series clock input Series data input N.C. No Connection N.C. No Connection N.C. No Connection SELLVDS LVDS data format Selection (3)(5) N.C. No Connection Overdrive Lookup Table Selection ODSEL (4)(6) TST_PGM Write protect input...
  • Page 15 Service Manual Model No.: +12V power supply +12V power supply +12V power supply +12V power supply Note (1) LVDS connector pin orderdefined as follows Note (2) Reserved for internal use. Please leave it open. Note (3) Low = Open or connect to GND: VESA Format, High = Connect to +3.3V: JEIDA Format. Note (4) Overdrive lookup table selection.

  • Page 16: Disassemble And Assemble

    Service Manual Model No.: 4. Disassemble and assemble 4-1 Remove the Pedestal Lay down the unit so that rear cover faces upward Remove the four screw from the rear cover indicated with ○ Then remove the pedestal 4-2Remove the Back Cover Remove the these screw indicated on figure above by ○...

  • Page 17: Remove The Terminal Bracket

    Service Manual Model No.: 4-4 Remove the Terminal Bracket Remove the six screw indicated on the figure above by ○ Then put the terminal bracket to the side 4-5 Remove the power module Remove the four screw indicated on the figure above by ○...

  • Page 18: Remove The Speaker

    Service Manual Model No.: 4-7 Remove the speaker Take out the speaker 4-8 Remove the remote control Remove the screw, take out the remote control board - 17 -...

  • Page 19: Installation Instructions

    Service Manual Model No.: 5. Installation Instructions 5-1 External Equipment Connections Accessories Battery User GUIDE Remote Control Antenna Connection Connect one end of a coaxial cable (not included) to the ANT IN jack on the back of your TV/DVD combo, then connect the other end of the cable into the antenna or cable TV wall outlet.
  • Page 20 Service Manual Model No.: AV EQUIPMENT This TV provides two groups of AV, one group of YPbPr for convenient connection to VCR, DVD or other video equipment. Please refer to the owner's manual of the equipment to be connected as well. You can use the input terminals on TV set rear as follows.
  • Page 21 Service Manual Model No.: STEPS: Be sure both the TV and computer are Power off. 1.Connect VGA and audio cable 2.Connect power cord 3.Power on the TV, switch to PC mode 4.Power on the PC This sequence is very important. AUDIO HDMI1 INPUT HDMI2 INPUT...

  • Page 22: Hdmi Connections

    Service Manual Model No.: 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.
  • Page 23 Service Manual Model No.: 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) - 22 -...
  • Page 24 Service Manual Model No.: 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: ■ Never connect the AC line cord plug to other than the specified voltage. Use the attached power cord only.

  • Page 25: Operation Instructions

    Service Manual Model No.: 6. Operation Instructions Basal information 6-1 Front panel controls VIDEO VIDEO 1.SOURCE Display the input source menu. 2.MENUDisplay main MENU. 3.CH+/CH-:In TV mode press“CH+”or“CH-”to 6.USB change the channel up and down.In MENU mode, press 7.VIDEO INPUT 8.AUDIO INPUT-L “CH+”or“CH-”to select items .In standby mode, 9.AUDIO INPUT-R...

  • Page 26: Universal Remote Control

    Service Manual Model No.: 6-3 Setting Up Your Remote Control 1:POWER To set the TV to standby or power on. 2:NUMBER KEY For direct access to channels. 3:MENU To display the menu. 4:CURSOR To move within the menu. 5:CH. LIST To display the channel list.

  • Page 27: Electrical Parts

    Service Manual Service Manual Model No.: Model No.: 7. Electrical parts 7-1. Block diagram Schematics BlockDiagram LED PANNEL BACKLIGHT flash Antenna in TUNNER lvds HDMI YPbPr MST6M48 SCART TPA3113 SPEAKER POWER DDR2 512M TITLE: Cover page Design: SuHaoFeng MODEL:MST6M48 Checked: PART NO.: DWG NO.: MST3208-YL01-01 Apprd:...

  • Page 28: Circuit Diagram

    Service Manual Model No.: 7-2. Circuit Diagram - 27 -...
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  • Page 35: Wiring Connection Diagram

    Service Manual Model No.: 7-3 .Wiring Connection Diagram NO.N Connection Wire(For Speaker) Connection Wire(Power For Mainboard) LVDS Wire Connection Wire(For Remote ) Connection Wire(Control for Backlight on/off) Connection Wire(For Remote ) Connection Wire(For USB) - 34 -...
  • Page 36 Service Manual Model No.: 8.TV OPERATION 1. CHANNEL MENU Delete Delete The first item of the MENU is channel menu ( for Press teletext red button, it will shows red delete TV source only). cursor. You can search channels and edit programs here. Press to choose the program.
  • Page 37 3. SOUND MENU The third item of the MENU is the SOUND MENU. OSD Language English You can adjust the sound effect here such as Restore Factory Default treble, bass, balance etc. Press to move, press OK button to confirm, and press to adjust.
  • Page 38 Service Manual Model No.: Press to select the function icon, press OK button to confirm the function. Press or EXIT button to exit the control bar. NOTE: You can adjust the audio track, subtitle, or program in the Info menu while Playing the video file. Choose the Info icon and press OK can display the Info MENU.
  • Page 39 Service Manual Model No.: 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 setup: set ADC value of YUV,VGA. It can also be auto-set. Adopt 100% color bar to yuv and Checkerboard signal to vga.
  • Page 40 Service Manual Model No.: 8.2 How to update software Haier MSD6M48 F/W upgrade with USB SOP Step 1: Ready for F/W Upgrade 1.1 Prepare a USB memory . 1.2 Copy the software file (merg.bin) from your computer to the USB memory, and remove it from computer’s USB port!
  • Page 41 Service Manual Model No.: 9. Trouble shooting 9-1. Simple check - 40 -...
  • Page 42 Service Manual Model No.: 9-2. Main board failure check 1) Black creen Is power LCD normal? CN101 CN101 Q101,Q107 U102 Check and the for U10 U102 2) White screen CN205 on VCC pins of Q102 Check if is working CN205 Signal on Q102 Check if...
  • Page 43 Service Manual Model No.: 3) Panel display abnormally connector is at normal level CN205 - 4 -...
  • Page 44 Service Manual Model No.: 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 CN701 speakers Check if the power supply...
  • Page 45 Service Manual Model No.: 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 PIN7 of this PIN7 TUNER1 Check if there is I2C signal at PIN4 &...
  • Page 46 Service Manual Model No.: 6) HDMI no picture or picture abnormal CN302 RX357,RX358,RX359 RX342,RX343,RX344,RX345 Q303 - 45 -...
  • Page 47 Service Manual Model No.: 7) PC no picture or picture abnormal - 4 -...
  • Page 48 Service Manual Model No.: 8) YPBPR, AV, SCART no picture or picture abnormal Check Y - 47 -...
  • Page 49 Service Manual Model No.: 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...
  • Page 50 Service Manual Model No.: 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...
  • Page 51 Service Manual Model No.: 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...
  • Page 52 Service Manual Model No.: 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...
  • Page 53 Service Manual Model No.: 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...
  • Page 54 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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