Hitachi 26LD8000TA Manual de usuario

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

LCD Television

July 2005 Digital Media Division

YK No.019E

SERVICE MANUAL 26LD8000TA

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.

Caution

1. Features --------------------------------------------------3

2. Speciﬁcations--------------------------------------------4

3. Component names -------------------------------------5

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

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

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

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

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

Contents

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

sufﬁciently 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.

Service Warning

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.

zPlease take note of these cautionary flags.

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

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

zAlso note these cautionary icons

This means "CAUTION" This means "MUST"

This means "POTENTIAL ELECTRIC

SHOCK" 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.

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.

Perform safety check when done.

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.

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.

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 . If you use

non-recommended components, then

electric shock or fire may result.

PRECAUTIONS

zCleaning 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.

zCleaning 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

zEnhanced 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.

zHigh 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).

zEasy-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.

zPower saving system

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

2. Specifications

Display

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

Panel

Resolution 1366 (H) x 768 (V) pixels

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

Net weight 18 kg (With Base)

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

Ambient

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

Power supply AC100 - 240V, 50/60Hz

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

Audio output Build in 10W + 10W (4 Ω)

(RGB input)

Input terminals RGB1-VGA audio input terminal (3.5mm Stereo Mini Jack)

RGB1-VGA analog RGB input terminal (D-sub 15-pin)

Video signals 0.7 V

Input signals

Sync signals

H/V separate, TTL level [2kΩ]

H/V composite, TTL level [2kΩ]

Sync on green, 0.3 Vp-p [75Ω]

Recommended signal 5 modes

(Video input)

Input terminals

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)

Input signals

Video signals

AV1 : NTSC-M / PAL

AV2 : NTSC-M / PAL

AV3 : NTSC-M / PAL / SECAM

AV4 : NTSC-M / PAL / SECAM

Video output Signal OUTPUT(TV): composite video TV-output terminal (RCA)

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

Recommended signal 5 modes

(TV RF input)

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

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

Applicable video signals for each input terminal

RCA D-sub

Signal Type

Terminal Composite

S-video component

RGB Remarks

AV1

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

AV2

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

AV3 {{

AV4 {{

RGB {

({: Avaliable)

3..Component names

¾[Main unit]

Control panel

zAn Adjustment buttons are located on the top of

the control panel

zIndications for each button's function can be found

on the inside of the control panel cover.

1. SUB-POWER 4. VOL X7.MENU

2. PROGRAM S4. RIGHTX7.ENTER

2. UP S5. VOL W

3. PROGRAM T5. LEFT W

3. DOWN T6. INPUT Normal Button Action

6.EXIT Button Action when MENU engaged

The main power switch is located at the right

side of the back.

¾[Remote Control]

4.Service points

zLead-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

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

zIf 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:

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

Recommended temperature range per part:

Part Soldering iron temperature

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

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

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

(1) IR PWB, KEY PWB, SW PWB,2* I/O PWB

(2) MAIN PWB

(3) POWER BOARD

The PWB assembl

which has used lead free solder

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 NTSC

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 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 Tand VOLUMES). ① ②

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)

zFACTORY MODE NAVIGATION

To navigate through the different menu items, use the Sor Tbutton 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.

ENTER

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