HITACHI - go-gddq. 4 2. Features Enhanced definition LCD display panel V420H1-LN3 is a 42” TFT Liquid Crystal Display module with 16-CCFL backlight unit and 2ch-LVDS interface

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  • Caution: Be sure to read this manual before servicing. To ensure safety from fire, electric shock, injury, harmful radiation and materials, various measures are provided in this LCD TV. Be sure to read cautionary items described in the manual before servicing. These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing other than that described in the operating instructions unless you are qualified to do so. 1. Summary New High Gloss Black Frame; (4) HDMI (V.1.3 with x.v.Color, CEC) - 1080p60, 1080p24; Input Compatible; New Multi-Function Remote Control; Dynamic/Standard/Movie/Custom/Game Picture Memories; 3 Preset Color Temperatures; Game Mode

    LCD TV 2009-4 L42A403

    HITACHI

    9. Block Diagram..............21

    10. Schematic Diagram22

    11. Connection Diagram......42

    12. Wiring Diagram..............43

    13. PCB Layout.........44

    14. Exploded View...................53

    15. BOM List..............................................54

    1. Summary.............................................1

    2. Features.................................................4

    3. Dimensions..5

    4. General Specification........................................6

    5. Service points............7

    6. Adjustment.............8

    7. Troubleshooting...........11

    8. Self Diagnosis Function..........20

    Table of Contents

    HITACHI

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    Caution for Safety Please read this page before repair the TV. The following safety precautions are designed to help you stay safe and prevent accidents during the repair work.

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    2. Features Enhanced definition LCD display panel V420H1-LN3 is a 42 TFT Liquid Crystal Display module with 16-CCFL backlight unit and 2ch-LVDS interface. This module supports 1920 x 1080 HDTV format and can display true 16.7M colors (8-bit/color). New High Gloss Black Frame (4) HDMI (V.1.3 with x.v.Color, CEC) - 1080p60, 1080p24 Input Compatible New Multi-Function Remote Control Dynamic/Standard/Movie/Custom/Game Picture Memories 3 Preset Color Temperatures Game Mode

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    3. Dimensions

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    4. General Specification

    Inputs

    Power Input: AC 120V, 60Hz Power Consumption Maximum Power: 250 W, 2.5 A Antenna Input Impedance: 75 Ohm Channel Coverage: 191ch. VHF-Band: 2~13; UHF-Band: 14~69 CATV Mid Band: A5~A1, AI Super Band: J-W; Hyper Band: W+1 - W+28; Ultra Band: W+29 - W+94 Television System: NTSC Standard, ATSC Standard (8 VSB, 64-QAM,

    256-QAM) Video: 1.0Vp-p, 75 Ohm S-Video Luminance(Y): 1.0Vp-p, 75 Ohm; Chrominance(C): 0.286Vp-p, 75 Ohm Component Video Luminance(Y): 1.0Vp-p, 75 Ohm; Chrominance(PB/PR): 0.7Vp-p, 75 Ohm Audio Input Impedance: more than 20k Ohm Average Input Level: 470mVrms HDMI: (19 PIN)

    Video

    Display Resolution: 1920 x 1080p Wide Viewing Angle Color Temperature Presets: High, Standard and Medium Multiple Screen Fill Modes: (Auto/4:3/16:9/Zoom 1/ Zoom 2/Full)1 4MB 10-bit 3D Y/C Comb Filter Picture Modes: Dynamic, Standard, Movie, Custom and Game

    Audio

    MTS Stereo/SAP 4 Sound Modes (Custom, Standard, Movie, News) SRSTruSurround HD Sound L42A403: 24W

    Inputs/Outputs

    Wideband Component Y, P B, PR Composite Video S-Video Antenna (RF)Inputs Optical Output HDMI Upgrade USB Slot RGB Input RGB Audio Input Phone Jack for Headphones

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    5. Service points Lead-free solder This product uses lead-free solder (unleaded) to help protect the environment. Please read these instructions before attempting any soldering work.

    1) Lead-free solder indicator

    Printed circuit boards using lead-free solder are engraved with an label. 2) Properties of lead-free solder The melting point of lead-free solder is 40-50 higher than leaded solder. 3) Servicing solder Solder with an alloy composition of Sn-3.0Ag-0.5Cu or Sn-0.7Cu is recommended. Although servicing with leaded solder is possible, there are a few precautions that have to be taken. (Not taking these precautions may cause the solder to not harden properly, and lead to consequent malfunctions.)

    Precautions when using leaded solder Remove all lead-free solder from soldered joints when replacing components. If leaded solder should be added to existing lead free joints, mix in the leaded solder thoroughly after the lead-free solder has been completely melted (do not apply the soldering iron without solder). 4) Servicing soldering iron A soldering iron with a temperature setting capability (temperature control function) is recommended. The melting point of lead-free solder is higher than leaded solder. Use a soldering iron that maintains a high stable temperature (large heat capacity), and that allows temperature adjustment according to the part being serviced, to avoid poor servicing performance. Recommended soldering iron: Soldering iron with temperature control function (temperature range: 320-450)

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    6. Adjustment 6.1 ADC adjustment . In the TV mode adjust volume to zero, press menu key and then press number key 1 9 9 9. It will

    achieve the factory mode. Select the item of White Balance and press right key to enter it. The factory menu follow picture:

    Change TV, press the item Current Source to Component mode and change signal to 1080i mode, press the item

    Auto Color; Change TV, press the item Current Source to PC mode and change signal to PC TIMING

    137(1024X768) Pattern 147 (16 Grays), press the item Auto Color.

    6.2 White Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment. Before started adjust white balance, please set the Ca210 Channel to 05 Channel and set its mode to xyLv mode.

    Color Temp. Cold Normal Warm x 272 285 313

    y 278 293 329 HDMI MODE Y Panel max luminance

    Note: The tolerance of the Cold color coordinates should be less than 10; The tolerance of the Normal color coordinates should be less than 20; The tolerance of the Warm color coordinates should be less than 20;

    How to setting the Ca210 channel, you can reference to Ca210 user guide or simple use the Memory CH up or

    down to set the channel to 05 channel, and use the Mode key to set the mode to xyLv.

    Following is the procedure to do white-balance adjust

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    Note: We can only the HDMI white balance to cover the white balance of all source modes, this method is meeting to the Zoran 775 software.

    HDMI mode:

    . In the TV mode adjust volume to zero, press menu key and then press number key 1 9 9 9. It will

    achieve the factory mode. Select the item of White Balance and press right key to enter it. The factory menu follow picture:

    .before to adjust the white balance, please press the factory mode OSD of Reset to reset all white

    balance factory setting.

    In the White Balance you can adjust 8 items.

    1> R Offset, G Offset, B Offset R, G, B Offset adjust.

    2> R Gain, G Gain, B Gain R, G, B Gain adjust.

    3> ZR-Bright adjust;

    4>ZR-Contrast adjust;

    5>ZR-T Colot Temp adjust;

    . Gain adjustment:

    A. Adjust Cool color-temperature:

    1. Set the pattern generator to pattern 104 or 0 IRE pattern. And adjust the Item ZR-Bright to min luminance.

    2. Switch the Ca210 to xyLv-mode (with press MODE button)

    3. Switch the Ca210 channel to Channel 05 (with up or down MEMORY CH button)

    4. The LCD-indicator on Ca210 will show x =272, y =278, Lv can adjust to max luminance.

    5. Use the item Roffset and B Offset adjust to Adjust black balance: use 20 IRE(Pattern 190) signal,and adjust the

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    black balance,until the Ca210 show x =272, y =278.

    6. Use the item R Gain and B Gain to adjust white balance: use 100 IRE (Pattern 105) signal, and adjust the white

    balance, until the Ca210 show x =272, y =278.

    7. Adjust item ZR-Contrast to check color temperature is saturation or not: Add by 7 steps and then to adjust the

    item R Gain and item B Gain to check the color temperature is saturation or not, until is saturation.

    8. Enter the item Color Temp to select another color temperature to adjust.

    B. Adjust Normal temperature: 1. Set the pattern generator to pattern 104 or 0 IRE pattern. Adjust the Item ZR-Bright value and can adjust to min

    luminance

    2. Switch the Ca210 to TuvLv-mode (with press MODE button)

    3. Switch the Ca210 channel to Channel 05 (with up or down MEMORY CH button)

    4. The LCD-indicator on Ca210 will show T=9300K.

    5. Adjust the Color Temp item: Normal, until Ca210 indicator reached the value T=9300k.

    C. Adjust Warm color-temperature: 1. Set the pattern generator to pattern 104 or 0 IRE pattern. Adjust the Item ZR-Bright value and can adjust to min

    luminance

    2. Switch the Ca210 to TuvLv-mode (with press MODE button)

    3. Switch the Ca210 channel to Channel 05 (with up or down MEMORY CH button)

    4. The LCD-indicator on Ca210 will show T=6500K.

    5. Adjust the Color Temp item: Warm, until Ca210 indicator reached the value T=6500k.

    Press Exit button on remote control to quit from factory mode.

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    7. Troubleshooting

    1). No Picture, No Sound First, confirm the status of Stand-by / On lamp (LED), then survey by following the flowchart as shown below.

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    2). No Picture, Picture