Hitachi 26LD8000TA User Manual

No.019E

26LD8000TA

SERVICE MANUAL

Caution

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.

Service Warning

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

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

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

4. 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 -------------------------------------5

4. Service point ---------------------------------------------7

5. Adjustment -----------------------------------------------8

6. Troubleshooting --------------------------------------- 16

7. Self-diagnosis function ------------------------------ 21

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

8. Block diagram ----------------------------------------- 23

9. Wiring diagram ---------------------------------------- 25

10. Circuit diagram ---------------------------------------- 26

11. Printed wiring board diagram ---------------------- 42

12. Disassembly diagram -------------------------------- 46

13. Replacement parts list ------------------------------- 48

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LCD Television

July 2005 Digital Media Division

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.

z Please take note of these cautionary flags.

Warning

Caution

z Also note these cautionary icons

This means "CAUTION"

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

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

This means "POTENTIAL ELECTRIC SHOCK"

This means "MUST"

This means "DO NOT"

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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 TV contains high voltage parts and

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.

. If you use

 Perform safety check when done.

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.

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PRECAUTIONS

z Cleaning the TV’s LCD screen panel

Before cleaning the TV, turn it off and disconnect the power plug from the power outlet. To prevent scratching or damaging of the LCD screen face, do not knock or rub the surface with sharp or hard objects. Clean the screen with a soft cloth moistened with warm water and dry with a second soft cloth. If it is not enough, then use a cloth with mild detergent. Do not use harsh or abrasive cleaners.

z Cleaning the TV's cabinet

Use a soft cloth to clean the TV's cabinet and control panel. When excessively soiled, dilute a neutral detergent in water, wet and wring out the soft cloth in it, gently clean the cabinet, and then wipe it down with a dry soft cloth. Never use acid/alkaline detergents, alcoholic detergents, abrasive cleaners, powder soaps, OA cleaners, car wax, glass cleaners, and so on. They will cause discoloration, scratches or cracks.

1. Features

z Enhanced definition LCD display panel

The 26-inch color LCD display panel, with a resolution of 1366 (H) x 768(V) pixels, creates a widescreen picture. This panel features a thin form factor and can be hung on a wall with an optional wall mounting kit.

z High Performance Digital Processor

This panel displays a wide range of personal computer signals from 640 x 480, 800 x 600 SVGA to 1280 x 768 WXGA.(RGB Analog input).

z Easy-to-use remote control and on-screen display system

The included remote control operates all TV functions. Futhermore, the on-screen display system shows the status of the control settings in an easy-to-view fashion.

z Power saving system

When connected to a VESA DPMS-compliant PC, the TV cuts its power consumption while idle.

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2. Specifications

Display

Panel

Net dimensions 661.9 (W) x 522.5 (H) x 266.9(D) mm (With Base)

Net weight 18 kg (With Base)

Ambient

conditions

Power supply AC100 - 240V, 50/60Hz

Power consumption/at standby <120W / <1W

Audio output Build in 10W + 10W (4 Ω)

(RGB input)

dimensions

Resolution 1366 (H) x 768 (V) pixels

Temperatur Operating: 0°C to 40°C, Storage: -15°C to 50°C

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

Approx. 26.005nches (604 (H) x 323 (V) mm, diagonal 600.53mm)

Input terminals

Input signals

Recommended signal 5 modes

(Video input)

Input signals

Video output Signal

Recommended signal 5 modes

(TV RF input)

Video signals 0.7 V

Sync signals

Input terminals

Video signals

RGB1-VGA audio input terminal (3.5mm Stereo Mini Jack) RGB1-VGA analog RGB input terminal (D-sub 15-pin)

H/V separate, TTL level [2kΩ ] H/V composite, TTL level [2kΩ ] Sync on green, 0.3 Vp-p [75Ω]

AV1 : Component input (Y-PbPr/Y-CbCr) (RCA) AV1 : L/R audio input terminal(RCA)AV1 : L/R audio input terminal(RCA) AV2 : Component input (Y-PbPr/Y-CbCr) (RCA) AV2 : L/R audio input terminal(RCA)AV1 : L/R audio input terminal(RCA) AV3 : Composite video input terminal(RCA) AV3 : S video input teminal AV3 : L/R audio input terminal(RCA) AV4 : Composite video input terminal(RCA) AV4 : S video input teminal AV4 : L/R audio input terminal(RCA)

AV1 : NTSC-M / PAL AV2 : NTSC-M / PAL AV3 : NTSC-M / PAL / SECAM AV4 : NTSC-M / PAL / SECAM

OUTPUT(TV): composite video TV-output terminal (RCA) OUTPUT(TV): L/R audio TV- output terminal (RCA)

Input signals Input terminals Analog RF input terminal (NTSC/PAL/SECAM)

z It takes at least 30 minutes to attain the maximum picture quality.

Applicable video signals for each input terminal

Signal Type

Terminal

AV1 { 480i/480p/1080i/720p inputs (PAL).

AV2 { 480i/480p/1080i/720p inputs (PAL).

AV3

AV4

RGB

Composite

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RCA D-sub

Remarks

S-video component

{ {

RGB

{

({: Avaliable)

3..Component names

¾ [Main unit]

Control panel

z An Adjustment buttons are located on the top of

the control panel

z Indications for each button's function can be found

on the inside of the control panel cover.

1. SUB-POWER 4. VOL X 7.MENU

2. PROGRAM S

2. UP S 5. VOL W

3. PROGRAM T

3. DOWN T 6. INPUT Normal Button Action

4. RIGHTX 7.ENTER

5. LEFT W

6.EXIT Button Action when MENU engaged

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The main power switch is located at the right side of the back.

¾ [Remote Control]

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4.Service points

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

label.

 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

Mounting (chips) on empty PCB

Chassis, metallic shield, etc.

(1) IR PWB, KEY PWB, SW PWB,2* I/O PWB (2) MAIN PWB (3) POWER BOARD

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The PWB assembly which has used lead free solder

320℃±30℃

380℃±30℃

420℃±30℃

5.Adjustment

5.1 SERVICE (FACTORY) MODE ACCESS

This model has a Factory Mode, where the technician can access and adjust some of the color temperature settings. The Factory Mode has several different appearances, depending on the input signal.

Picture Setting

for Factory Model

Table1 TV

Table2 AV (composite)/SV(S-Video)

Table3 SV(S-video)

Table4 480i(component)

Table5 480p(component)

Table6 1080i/60(component)

Table7 720P/60(component)

Picture Setting

for Factory Model

NTSC

PAL

Table1 TV

Table2 AV (composite)/SV(S-Video)

Table3 SV(S-video)

Table4 576i(component)

Table5 576p(component)

Table6 1080i/50(component)

Table7 720P/50(component)

Preliminary

1. To access the Factory Mode, the TV must be running.

Procedure

2. Press and hold the #3 and #4 button (PROGRAM

3. While continuing to hold the #3 and #4 button, press and hold the #1 button (SUB-POWER).

4. After both buttons have been held down for five (5) seconds, first release the #1 button, then release the #3 and #4 button.

5. As stated previously, the input that the TV had selected at the time will determine which actual FACTORY MODE display will show up. (See next page)

T and VOLUMES). ① ②

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ENTER

z FACTORY MODE NAVIGATION

To navigate through the different menu items, use the

S or T button on the remote control. The menu items

will be high-lighted green as navigation occurs. To access a particular adjustment parameter, use the “ENTER” button on the remote control, which will cause a new menu to appear. To back up from the FACTORY MODE, use the RETURN or EXIT button on the remote control. To leave the FACTORY MODE, press POWER button on the remote control.

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Menu Function Description

Video

Picture Mode OSD menu video mode default setting

Picture Display Contrast adjustment ( Back- end )

Brightness Display Brightness adjustment ( Back- end )

Tint Display Hue adjustment ( Back- end )

Color Display Saturation adjustment ( Back- end )

Detail Display Sharpness adjustment ( Back- end )

Backlight LCD backlight control ( Back- end )

Color temperature default setting ( High or Low )

Temperature

ADC

ADC Gain - R ADC input signal gain adjustment ( R/Pr ) , For D1 ~ D4 and PC only

ADC Gain - G ADC input signal gain adjustment ( G/Y ) , For D1 ~ D4 and PC only

ADC Gain - B ADC input signal gain adjustment ( B/Pb) , For D1 ~ D4 and PC only

TCD3

TCD3 Con. Video decoder contrast adjustment ( Front- end )

TCD3 Bri. Video decoder brightness adjustment ( Front- end )

TCD3 Hue Video decoder Hue adjustment ( Front- end )

TCD3 Sat. Video decoder Cr Saturation adjustment ( Front- end )

TCD3 Sat. Video decoder Cb Saturation adjustment ( Front- end )

YC Delay Video decoder YC delay adjustment ( Front- end )

Video decoder sharpness peaking range ( Front- end )

Color

Peaking Range

Ypeak = Y + YH * (peak_gain/peak_range) where Y is the luma and YH

is the high frequency luma only

Peaking Gain Video decoder sharpness peaking gain ( Front- end )

Peaking Enable Video decoder sharpness peaking function enable ( Front- end )

Scalar

Output R contrast factor adustment ( color temperature function )

Scalar Con - R

Output R = (( 'Output R + (Scalar Off-R)) * (Scalar Con-R) + (Scalar

Bri-R)

Output G contrast factor adustment ( color temperature function )

Scalar Con - G

Output G = (( 'Output G + (Scalar Off-G)) * (Scalar Con-G) + (Scalar

Bri-G)

Output B contrast factor adjustment ( color temperature function )

Scalar Con - B

Output B = (( 'Output B + (Scalar Off-B)) * (Scalar Con-B) + (Scalar

Bri-B)

Scalar Bri - R Output R brightness factor adustment ( color temperature function )

Scalar Bri - G Output G brightness factor adustment ( color temperature function )

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Scalar Bri - B Output B brightness factor adustment ( color temperature function )

Scalar Off - R Output R offset factor adustment ( color temperature function )

Scalar Off - G Output G offset factor adustment ( color temperature function )

Scalar Off - B Output B offset factor adustment ( color temperature function )

Display

Disp MP BL

Display sharpness band pass gain of peaking adjustment ( Back- end ) ,

OSD sharpness adjustment item

HSharp LP Display sharpness low pass gain of peaking adjustment ( Back- end )

Display sharpness high pass gain of peaking adjustment ( Back- end ) ,

Hsharp HP

OSD sharpness adjustment item

Vsharp Display Vertical sharpness adjustment ( Back- end )

Black stretch start-point control factor. Higher value means more black

Black Ext. Start

stretch

( Back- end )

Black Ext.

Black stretch gain1

Gain1

Black Ext.

Black stretch gain2

Gain2

U Delay Display U delay ( comparing with Y )

V Delay Display Y delay ( comparing with V )

Color

Process

Skin color adjustment active range low

Low

Skin Range

Skin color adjustment active range high

High

Skin Gain Low Skin color adjustment gain of range low

Skin Gain High Skin color adjustment gain of range high

Skin Color

Skin color adjustment function enable

Enable

Green Str.

Green stretch active range ( UV domain green color active angle )

Angle

Green Str. Gain Green stretch gain

Green Str.

Green stretch function enable

Enable

Blue Threshold Blue add function active threshold

Blue Circle

Blue add function active range

Range

Blue Add Blue add function enable

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Enable

Blue Gain Blue add gain

z COLOR TEMPERATURE ADJUSTMENTS

Following the procedures to make the color temperature adjustments. Note that a colorimetry meter (such as a Minolta CA-210) is require Low : x=0.301 +/- 0.01, y=0.314 +/- 0.01 = Color Temp.: 7500K

High : x=0.266 +/- 0.01, y=0.264 +/- 0.01 = Color Temp.: 15000K

5.2 Firmware update

This model has a Debbug Mode, where the technician can debbug and update the firmware. Preliminary

1.To access the Bebbug Mode, the TV must be

running.

Procedure

2. Press and hold the #2 and #5 button (PROGRAM S and VOLUME

3. After both buttons have been held down for five (5) seconds, then release the #2 and #5 button.

4. Click IAPWriter.EXE

d to measure the actual screen color temperature.

T).

5. Following window will be shown after IAPWriter.EXE is executed.

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6. Load BIN file.

7. Click OK button

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8. Click Write Device icon

9. IAP is finished while following massage is shown.

10. After IAP is done, please disconnect and reconnect AC power switch and do initialization.

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5.3 Initialization

This model has a Initialization Mode, where the technician can initial the EEPROM.

Preliminary

1.To access the Bebbug Mode, the TV must be

running.

Procedure

6. Press and hold the #4 and #5 button (VOLUMES and VOLUME

① ②

T).

7. While continuing to hold the #4 and #5 button, press and hold the #1 button (SUB-POWER).

8. After both buttons have been held down for five (5) seconds, first release the #1 button, then release the #4 and #5 button.

9. As stated previously, the input that the TV had selected at the time will determine which actual INITIALIZATION display will show up. (See below)

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6.Troubleshooting

The flow chart shown below will help you to troubleshoot your TV set with it doesn’t display normally. Each procedure offers a simple way to check for system errors. Before starting, ensure that there is a signal in and that the TV is turned on.

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