Hitachi L37X01A, L42X01A Schematic

No.055E

L37X01A

SERVICE MANUAL

L37X01A : The LCD panel made from IPS-Alpha is used for this product. L42X01

Be sure to read this manual before servicing. To ensure safety from ﬁ re, 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 qualiﬁ ed 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 qualiﬁ ed to do so.

A : The LCD panel made from LPL is used for this product.

Caution

L42X01A

Service Warning

1. Since the Panel Module and the front Filter are made of glass, handling the broken Module and Filter carefully and with caution in order not to receive injury.

2. Replacement work should be started after the Panel Module and the AC/DC Power supply have become sufﬁ ciently cool.

3. Special care should be taken when working near the display area in order not to damage its surface.

4. The Panel Module should not be touched with bare hands in order to protect its surface from blemishes and damage.

5. It is recommended that you use clean soft gloves during the replacement work in order to protect not only the display area of the Panel Module but also yourself.

Contents

1.Features ······················································· 3

2.Speciﬁ cations ··············································· 4

3.Component names ······································· 7

4.Service points ·············································· 10

5.Adjustment ·················································· 11

6.Troubleshooting ·········································· 17

7.Hotel Menu Operation ································· 20

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

8.Block Diagram ··········································· 23

9.Connection Diagram ································· 26

10.Wiring Diagram ·········································· 27

11.Printed Wiring Board Diagram ··················· 29

12.Disassembly Diagram ······························· 38

13.Replacement Parts List ····························· 45

LCD TV

September 2007

L37X01A / L42X01A

CAUTION FOR SAFETY

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

z Please take note of these cautionary flags.

TV.

Warning

Caution

z Also note these cautionary icons

This means "CAUTION"

This means "POTENTIAL ELECTRIC SHOCK"

This means "Potential to sustain injury or even death."

This means "Potential to sustain breakage or irreparable damage."

This means "MUST"

This means "DO NOT"

WARNING

 Follow instructions.  Must use same types of wires and components.

The cabinet, chassis, and labels are parts that require attention. You must follow the caution notes and safety instructions presented throughout this User Manual to prevent damage to them or injury to yourself.

 Prevent electric shock.

Exercise caution while working on the device as the voltage parts and power supply.It is possible to sustain severe injury or death if you accidentally touch the wrong parts.You must disconnect the power supply while servicing, reassembling, or change parts. If you touch a live connection it is possible to sustain severe injury or death.

 Use recommended components.

Use only the recommended components or componentst that structurally identical to the originals. This is to ensure safety and reliability. Pay special attention to parts in the parts list and circuit diagrams

marked with non-recommended components, then electric shock or fire may result.

TV contains high

. If you use

 Perform safety check when done.

 Do not try to check the HDCP code and

combination circuit.

The TV uses special tubes and tapes made from insulated materials. Moreover, some materials are kept from making contact with the PWB for the sake of safety.Internal leads are kept from hot parts or high voltage parts by means of clamps or other measures. As such, you must restored these parts to their original conditions in order to prevent electric shock or fire.

Every part (such as removed screws, components, and wiring) must be restored to their prior conditions after servicing.Be sure to check everything that was repaired for damage or mistakes. Also measure the insulated impedance with a meg-ohm meter to confirm that the impedance value is more than 4M ohm.If the impedance value is less than 4M ohm, then electric shock or fire may result.

Never remove the shield case protecting the HDCP code and combination circuit.

L37X01A / L42X01A

PRECAUTIONS

z Cleaning the LCD panel of the television

Please make sure to unplug the power cord before cleaning the television.

● Wipe the panel with a lint-free and dry cloth in order to prevent damage to the panel surface.

● Do not use a chemical cloth or cleaner. Depending on the ingredients, it may cause discoloration and

damage the panel surface.

● Do not wipe with a hard cloth or rub hard. It may hurt the panel surface.

● In case of the greasy dirt such as fingerprint, wipe with a lint-free cloth moistened by a diluted neutral

detergent solution, and then wipe with a soft and dry cloth.

● Do not use a spray cleaner. It could cause malfunction.

z Cleaning the monitor's cabinet of the television

● The following may cause crack, deformation, and paint peeling.

● Do not wipe the cabinet with benzene, thinner, and other chemical products.

● Do not spray volatile solutions such as insecticide over the cabinet.

● Do not leave the cabinet in prolonged contact with plastic or rubber materials.

● Do not use a chemical cloth, cleaner or wax. Depending on the ingredients, it may cause crack and

deformation.

● Use a lint-free cloth to clean the cabinet and control panel of the television. In case of the heavy dirt,

wipe with a soft cloth moistened by a diluted neutral detergent solution, and then wipe with a soft and dry cloth.

● Never use the following detergents. It could cause crack, discoloration, and scratch.

● Acid/ alkaline detergent, alcoholic detergent, abrasive cleaner, powder soap, OA cleaner, car wax,

glass cleaner, etc.

1. Features

● Large-screen and high-definition LCD panel.

● Improved Digital signal processor.

● Accept more digital input devices with HDMI terminals.

● Great diversity of connecting terminals to cover wide range of audio-visual equipments.

● Enjoy the image from PC with large, high-definition LCD screen.

● Easy-to-use On-Screen Display system operating with Remote control.

● Low power consumption with Power Saving feature.

● Digital Terrestrial Television Broadcasting

Converting into digital signal enables to provide more channels and various useful features, such as

Electric Programme Guide, Digital Teletext, and so on. Further, digital signal can create high quality

picture.

2. Specifications

L37X01A / L42X01A

SPECIFICATION L37X01A L42X01A

Panel

Display dimensions

Approx. 37 inches (820 (H) × 461 (V)mm, diagonal 941 mm)

Approx. 42 inches (930(H) × 523 (V)mm, diagonal 1067 mm)

Resolution 1920(H) x 1080 (V) pixels

including Optional Stand: 1033 (W) x 749 (H) x 365 (D) mm excluding Optional Stand: 1033 (W) x 692 (H) x 126 (D) mm

including Optional Stand: 28.3kg excluding Optional Stand: 24.0 kg

Net dimensions

Net weight

Ambient conditions

Temperature

Relative humidity

including Stand: 910 (W) x 680 (H) x 365 (D) mm excluding Stand: 910 (W) x 627 (H) x 125 (D) mm

including Stand: 24.2 kg excluding Stand: 19.9 kg

Operating: 5°C to 35°C, Storage: 0°C to 40°C

Operating: 20% to 80%, Storage: 20% to 90% (non-condensing)

Power supply AC110 - 240V, 50/60Hz

Power consumption/at standby 167W/< 2W 200W/< 2W

Audio output speaker total 20W

(VIDEO input)

●

AV2: component video input terminal (RCA)

AV1

L/R audio input terminal (RCA)

●

AV3

Input terminals

AV4: composite video input terminal (RCA)

S video input terminal

L/R audio input terminal (RCA)

HDMI1~3 : HDMI input terminal

Composite video : PAL, SECAM, NTSC3.58, NTSC4.43, PAL60

Input signals

Component video: 480i, 576i, 480p, 576p, 720p/50, 720p/60, 1080i/50, 1080i/60 HDMI1~3 : 480i, 576i, 480p, 576p,720p/50, 720p/60,1080i/50,1080i/60,1080p/50,

1080p/60, 1080p/24

OUTPUT (MONITOR): composite video monitor-output terminal (RCA)

Output signals

OUTPUT (MONITOR): L/R audio monitor- output terminal (RCA) OUTPUT (HEADPHONE): L/R audio monitor- output terminal (Mini-pin) OPTICAL OUT (Digital Audio) : PCM, Dolby® Digital

(RF input)

Input terminal / Receiving range ANT: 75Ω Unbalanced / 44~870MHz

RF Video System

(RGB input)

Input terminals

Input signals 0.7 V, analog RGB (Recommended Signal)

Sync signals H/V separate, TTL level [2kΩ]

● The television takes at least 30 minutes to attain the status of optimal picture quality.

S-Video input terminal is available for AV3 of L37X01A only.

This analog audio input terminal can be used for PC (RGB) or HDMI 1~3 only.

PAL B, G, H / I / D, K SECAM B, G / D, K / K1 NTSC-M DVB-T

Analog RGB input terminal (D-sub 15-pin) Audio input terminal (3.5mm Stereo Mini Jack)

● The Expression of input signal mode (format)

L37X01A / L42X01A

With HDMI INPUT

[Table] Digital HDMI 1 Video Timing Chart

Signal

name

Signal mode

Resolution

Vertical

frequency

(Hz)

Horizontal frequency

(KHz)

Dot clock

frequency

(MHz)

Remarks

1 VGA 640x480 59.94 31.47 25.18 EIA-861D

2 XGA 1024x768 60 48.36 65 VESA

3 576i 720(1440)x576 50 15.63 27 EIA-861D

4 480i 720(1440)x480 59.94 15.73 27 EIA-861D

5 576p 720x576 50 31.25 27 EIA-861D

6 480p 720x480 59.94 31.47 27 EIA-861D

7 1080i/50 1920x1080 50 28.13 74.25 EIA-861D

8 1080i/60 1920x1080 60 33.75 74.25 EIA-861D

9 720p/50 1280x720 50 37.5 74.25 EIA-861D

10 720p/60 1280x720 60 45 74.25 EIA-861D

11 1080p/50 1920x1080 50 56.25 148.5 EIA-861D

12 1080p/60 1920x1080 60 67.5 148.5 EIA-861D

13 1080p/24 1920x1080 24 27 74.25 EIA-861D

[Table] Digital HDMI 2 & 3 Timing Chart

Signal

name

Signal mode

Resolution

Vertical

frequency

(Hz)

Horizontal frequency

(KHz)

Dot clock

frequency

(MHz)

Remarks

1 VGA 640x480 59.94 31.47 25.18 EIA-861D

2 576i 720(1440)x576 50 15.63 27 EIA-861D

3 480i 720(1440)x480 59.94 15.73 27 EIA-861D

4 576P 720x576 50 31.25 27 EIA-861D

5 480P 720x480 59.94 31.47 27 EIA-861D

6 1080i/50 1920x1080 50 28.13 74.25 EIA-861D

7 1080i/60 1920x1080 60 33.75 74.25 EIA-861D

8 720p/50 1280x720 50 37.5 74.25 EIA-861D

9 720p/60 1280x720 60 45 74.25 EIA-861D

10 1080p/50 1920x1080 50 56.25 148.5 EIA-861D

11 1080p/60 1920x1080 60 67.5 148.5 EIA-861D

12 1080p/24 1920x1080 24 27 74.25 EIA-861D

With Component Video INPUT

L37X01A / L42X01A

[Table] Component Video Timing Chart

Signal

name

Signal mode

Resolution

Vertical

frequency

(Hz)

Horizontal frequency

(KHz)

Dot clock

frequency

(MHz)

Remarks

1 576i 720(1440)x576 50 15.63 27 EIA-861D

2 480i 720(1440)x480 59.94 15.73 27 EIA-861D

3 576P 720x576 50 31.25 27 EIA-861D

4 480P 720x480 59.94 31.47 27 EIA-861D

5 1080i/50 1920x1080 50 28.13 74.25 EIA-861D

6 1080i/60 1920x1080 60 33.75 74.25 EIA-861D

7 720p/50 1280x720 50 37.5 74.25 EIA-861D

8 720p/60 1280x720 60 45 74.25 EIA-861D

9 1080p/50 1920x1080 50 56.25 148.5 EIA-861D

10 1080p/60 1920x1080 60 67.5 148.5 EIA-861D

11 1080p/24 1920x1080 24 27 74.25 EIA-861D

With RGB input

Signal

name

Signal mode

Resolution

Vertical

frequency

(Hz)

Horizontal

frequency

(KHz)

Dot clock

frequency

(MHz)

Remarks

1 640 x 400 70.086 31.469 25.175 VESA IS0000003

3 800 x 600 60.32 37.88 40

4 1024 x 768 60 48.36 65

6 1280 x 768 59.876 47.776 79.5 VESA 8/21/03

z The type of video board or connecting cable used may not allow for correct displays adjustment of

VGA

VESA

640 x 480 59.94 31.47 25.18

1280 x 1024 60.02 63.98 108

1360 x 768 60.015 47.712 85.5 VESA 8/21/03

Horizontal Position, Vertical Position, Horizontal Clock and Clock Phase.

z The television may fail to display an animation image correctly when a signal having a vertical frequency

of 72Hz or higher is input to it.

z The television differentiates the signal modes according to the horizontal and vertical frequencies and

the horizontal and vertical sync signal polarities. Note that different signals having all these elements alike may be handled as the same signal.

z Displaying images with more than 768 lines of vertical resolution a Full display (compressed display)

can result in the interpolation of stripes.

3. Component names

L37X01A / L42X01A

[Main unit]

Front Panel

L37X01A

②

①

L42X01A

① Cabinet ② Panel ③ Remote Control Receiver ④ Indicating Lamp ⑤ Speaker ⑥ Desktop Stand (Option for L42X01A) ⑦ Main Power Switch (on the left side)

– for L37X01A

⑧ Main Power Switch (on the right side)

– for L42X01A

Rear Panel

L37X01A

①

① Side Input ② Power Cord Socket ③ Terminal Board (External Device Connection) ④ Control Panel (see next page for details)

L42X01A

④

①

③ ②

Control Panel

L37X01A / L42X01A

L37X01A

L42X01A

① Sub Power button

② Menu button ③ Channel Up/ S button ④ Channel Down/ T button

⑤ Volume Up

⑥ Volume Down

⑦ Input Select /OK button

/f button

/ebutton

Remote Control

L37X01A / L42X01A

Sub Power

Press this button to switch TV On or Off standby.

Device Select (TV/DVD/STB)

Press these buttons to select the device (TV, DVD or STB) to be controlled by

this remote control.

The selected button will light up to display the selected mode.Normally, select

“TV”.

Program Select [Page Select]

Press these buttons to select a TV program directly. For 2 or 3 digits channel

selection, press

Freeze [Hold]

Press this button to change the picture to freeze mode.

Press it again to return to normal picture. (Also, it holds the page in teletext

mode.)

CHI/II

This is exclusively for TV audio A2/NICAM mode.

Volume Up/Down [Color] TV/Text [TV

SWIVEL

NOTE

This switches between the TV mode and the Teletext mode.

Time [Cancel]

Press this button to display the time when receiving an analog TV program. The time is not displayed if the recevied signal does not have any time information.

Menu [Back Light] Cursor OK Off Timer

This automatically sets the power to stanby mode when the selected time period has elapsed. (0→30→60→90→120min.)

Input Select/DVD Control

Press these buttons to change input mode. In addition, you can use these

buttons while operating the selected brand of DVD player. Not Available Not Available

Recall

Press this button shows the input signal status.

Picture Mode

Picture mode can be changed each time pressed in the following sequence.

Dynamic→Natural →Cinema

Sound Mode

Sound mode can be changed each time pressed in the following sequence.

Movie→ Music→Speech→Favorite.

DTT/TV

Press this button to select DTT (Digital Terrestrial TV) mode or TV mode. Note:

DTT is not available for this model.

Multi Picture

Press this button to change the picture to multi-picture mode. Press it again to

return to normal picture.

Channel Up/Down[Page select] Mute [Reveal] [Subtitle]

[Index]

Return

You can use this to return to the previous menu.

Not Available

Picture Size [Zoom]

Press this button to change picture size.

Some buttons are only for Teletext mode, and other buttons have different functions in Teletext mode from the use of TV

mode. Those buttons are indicated by [ ].

button in advance.

Text]

4. Service points

L37X01A / L42X01A

z Lead-free solder

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

Caution: Always wear safety glasses to prevent fumes or molten solder from getting into

the eyes. Lead-free solder can splatter at high temperatures (600℃).

 Lead-free solder indicator Printed circuit boards using lead-free solder are engraved with an "F."

 Properties of lead-free solder The melting point of lead-free solder is 40-50℃ higher than leaded solder.

 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

z Remove all lead-free solder from soldered joints when replacing components.

z 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).

 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:

z Soldering iron with temperature control function (temperature range: 320-450℃)

Recommended temperature range per part:

Part Soldering iron temperature

Mounting (chips) on mounted PCB 320ºC±30ºC

Mounting (chips) on empty PCB 380ºC±30ºC

Chassis, metallic shield, etc. 420ºC±30ºC

The PWB assembly which has used lead free

(1) IR PWB, SW PWB, KEY PWB, SIDE I/O PWB , SIDE HDMI PWB

(2) FORMATTER PWB

(3) POWER BOARD

5.Adjustment

L37X01A / L42X01A

5.1 Color Temperature Adjustment Procedure

1. Preparation

1. Set the signal generator (ASTRO VG859A or equivalent) to RGB,

1024*768, 60HZ, Level:0.7V, all

white pattern..

2. Turn on the set and select RGB source,perform pre-heat run more than 30 min. with Full white

pattern.

Prepare Minolta CA210,and calibration before adjustment.

4. Press 「Menu」key , Press 「ok」 to select [Picture]Æ[Reset]Æ「Reset」Æ「ok」.

Picture Picture Mode

Contrast

Brightness Color Sharpness

Tint

Color Temperature

Back Light Reset

Select OK Set Return

Dynmaic

Cool

High

Reset

5. Press [Menu] key exit OSD.

2. Entering into factory Mode:

In VGA mode, press “Red” key, next press “Green” key, next press “Return” key in remote control to

enter into factory mode.

Factory Menu

NV CLEAR

Full Power

SourceCalibration

Reset Default

Aspect Ratio

Red

Green

Return key

HX42CG V1.00 Aug.2007 10:41:46

WARM(6500K)

NORMAL(9300K)

COOL(15000K)

TimerClear

Shipping Mode

000005 HOUR 58 MIN

3. Source Calibration (RGB)

L37X01A / L42X01A

1. Set the signal generator to RGB, Color bar pattern (level: 0.7V, color order from left side: white,

yellow, cyan, green,magenta, red, bule, black, width ratio: 12.5% for each color),

2. Entering into factory Mode: Press up or down key of remote control to select “Source Calibration”,

Press 「OK」 key to enter the item.

Factory Menu

HX42CG V1.00 Aug.2007 10:41:46

WARM(6500K)

NORMAL(9300K)

COOL(15000K)

TimerClear

Shipping Mode

000005 HOUR 58 MIN

-> Source calibration performed automatically.

4. Color Temperature Adjustment

(1) Set the signal generator to RGB,

1024*768, 60HZ, Level:0.56V(80%). Full white pattern.

(2) Press up or down key of remote control to select “Cool”, Press 「OK」 key to enter the item.

R, G, B drive values are set for COOL, NORMAL, and WARM independently.

NV CLEAR

Full Power

SourceCalibration

Reset Default

Aspect Ratio

HX42CG V1.00 Aug.2007 10:41:46

WARM(6500K)

NORMAL(9300K)

COOL(15000K)

Shipping Mode

000005

TimerClea r

Factory Menu

SourceCalibration

Reset Default

Aspect Ratio

HOUR 58

NV CLEAR

Full Power

MIN

Factory Menu

COOL(15000K)

Color Temperature

Red

Green

Blue

◄ ►

140

125

127

For Red drive, keep initial value (140).

Change Green, or Blue drive as follows;

- Press “Up” or “Down” key to select the item “R”, “G”, or “B”, and press [OK] key to enter.

- Press “Left” or “Right” key to set the value.

- Press [OK] key to exit.

(3) Select 「Cool 15000」

L37X01A / L42X01A

(1) Cool：15000 K spec.:

x=0.266±0.001

y=0.270±0.001

(2) If the x and y value are larger than specification,

Decrease Green drive from default value. Increase Blue drive from default value.

(3) If the x or y or both x and y value is/are smaller than specification.

Decrease Blue drive from default value

(4) According to a x and y value, please following adjustment of (4)-1 or (4)-2.

(4)-1 If x value is higher than spec

Increase Green drive from default value. Increase Blue drive from default value.

(4)-2 If y value is higher than spec,

Decrease Green drive from default value

(4) Select [Normal 9300]

Normal：9300 K spec.:

x=0.285±0.001

y=0.293±0.001

Adjust G drive (GREEN) or B drive (BLUE) to set x and y above.

(5) Select [WARM]

(1) WARM：6500 K spec.:

x=0.314±0.001

y=0.327±0.001

Adjust G drive (GREEN) or B drive (BLUE) to set x and y above.

(6) Exit Factory Mode:

After finish adjusting color temperature,press [MENU] to exit factory mode.

5. Color Temperature Check:

L37X01A / L42X01A

Press 「Menu」key , Press 「ok」 to select [Picture]Æ[Color Temp.]Æ[OK].

Picture Picture Mode

Contrast

Brightness Color Sharpness

Tint

Color Temperature

Back Light Reset

Select OK Set Return

Dynmaic

Cool

High

Reset

(1) Select 「Cool」,check If the color temperature is in spec.

Color Temperature

Next/Prev ◄► Adjust Return

Cool

Cool：15000 K

x=0.266±0.005

y=0.270±0.005

(2) Select [Normal],check If the color temperature is in spec.

Color Temperature

Next/Prev ◄► Adjust Return

Normal

x=0.285±0.005

y=0.293±0.005

Normal：9300K

(3) Select [Warm],check If the color temperature is in spec.

L37X01A / L42X01A

Color Temperature

Warm

Next/Prev ◄► Adjust Return

Warm：6500 K

x=0.314±0.005

y=0.327±0.005

6. Source Calibration (Component only support AV1 port used)

(1) Set the signal generator to Component, Color bar pattern (level: 0.7V, color order from left side:

white, yellow, cyan, green, magenta, red, bule, black, width ratio: 12.5% for each color)

(2) Entering into factory Mode):Press up or down key of remote control to select “Comp

Calibration”, Press 「OK」 key to start adjusting..

Factory Menu

HX42CG V1.00 Aug.2007 10:41:46

WAR M(6 500 K)

NV CLEAR

NORMAL(9300K)

COOL(15000K)

TimerClear

Shipping Mode

000002 HOUR 50 MIN

Full Power

Comp Calibration

Reset Default

Aspect Ratio

-> Source calibration performed automatically.

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