Toshiba 27DF46 Service Manual

FILE NO. 050-200543GR

(MFR’S VERSION A)

SERVICE MANUAL

COLOR TELEVISION

27DF46

The above model is classified as a green product (*1), as indicated by the underlined serial number. This Service Manual describes replacement parts for the green product. When repairing this green product, use the part(s) described in this manual and lead-free solder (*2).

For (*1) and (*2), see the next page.

DOCUMENT CREATED IN JAPAN, February, 2006 GREEN

(*1) GREEN PRODUCT PROCUREMENT

The EC is actively promoting the WEEE & RoHS Directives that define standards for recycling and reuse of Waste Electrical and Electronic Equipment and for the Restriction of the use of certain Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any marketing of new products containing the restricted substances.

Increasing attention is given to issues related to the global environmental. Toshiba Corporation recognizes environmental protection as a key management tasks, and is doing its utmost to enhance and improve the quality and scope of its environmental activities. In line with this, Toshiba proactively promotes Green Procurement, and seeks to purchase and use products, parts and materials that have low environmental impacts.

Green procurement of parts is not only confined to manufacture. The same green parts used in manufacture must also be used as replacement parts.

(*2) LEAD-FREE SOLDER

This product is manufactured using lead-free solder as a part of a movement within the consumer products industry at large to be environmentally responsible. Lead-free solder must be used in the servicing and repair of this product.

WARNING

This product is manufactured using lead free solder .

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT !

The melting temperature of lead-free solder is higher than that of leaded solder by 86°F to 104°F (30°C to 40°C). Use of a soldering iron designed for lead-based solders to repair product made with lead-free solder may result in damage to the component and or PCB being soldered. Great care should be made to ensure high-quality soldering when servicing this product  especially when soldering large components, through-hole pins, and on PCBs  as the level of heat required to melt lead-free solder is high.

A1-1

SERVICING NOTICES ON CHECKING

As for the places which need special attentions, they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the indications and notices in the operation manual.

2. AVOID AN ELECTRIC SHOCK

There is a high voltage part inside. Avoid an electric shock while the electric current is flowing.

3. USE THE DESIGNATED PARTS

The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety. Therefore, the part which is replaced should be used the part which has the same character. Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark, the designated parts must be used.

4. PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING

There are parts which use the insulation material such as a tube or tape for safety, or which are assembled in the condition that these do not contact with the printed board. The inside wiring is designed not to get closer to the pyrogenic parts and high voltage parts. Therefore, put these parts in the original positions.

5. TAKE CARE TO DEAL WITH THE CATHODE-RAY TUBE

In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is secured against implosion. However, when removing it or serving from backward, it is dangerous to give a shock. Take enough care to deal with it.

6. AVOID AN X-RAY1. KEEP THE NOTICES

Safety is secured against an X-ray by considering about the cathode-ray tube and the high voltage peripheral circuit, etc. Therefore, when repairing the high voltage peripheral circuit, use the designated parts and make sure not modify the circuit. Repairing except indicates causes rising of high voltage, and it emits an X-ray from the cathoderay tube.

PERFORM A SAFETY CHECK AFTER

7. SERVICING

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 portions 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. And be sure the safety of that.

(INSULATION CHECK PROCEDURE)

Unplug the plug from the AC outlet.

Remove the antenna terminal on TV and turn on the TV.

Insulation resistance between the cord plug terminals and the eternal exposure metal [Note 2] should be more than 1M ohm by using the 500V insulation resistance meter [Note 1].

If the insulation resistance is less than 1M ohm, the inspection repair should be required.

[Note 1]

If you have not the 500V insulation resistance meter, use a Tester.

[Note 2]

External exposure metal: Antenna terminal

Headphone jack

HOW TO ORDER PARTS

Please include the following informations when you order parts. (Particularly the VERSION LETTER.)

1. MODEL NUMBER and VERSION LETTER The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be

found at the end of the SERIAL NUMBER.

2. PART NO. and DESCRIPTION You can find it in your SERVICE MANUAL.

IMPORTANT

When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of the heat sink. Befor applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor.)

A1-2

TABLE OF CONTENTS

GREEN PRODUCT PROCUREMENT ........................................................................................

LEAD-FREE SOLDER ................................................................................................................

SERVICING NOTICES ON CHECKING.....................................................................................

HOW TO ORDER PARTS ..........................................................................................................

IMPORTANT ...............................................................................................................................

TABLE OF CONTENTS..............................................................................................................

GENERAL SPECIFICATIONS ...................................................................................................

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP ...............................................................................................

2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ................................................

SERVICE MODE LIST ................................................................................................................

WHEN REPLACING EEPROM (MEMORY) IC ..........................................................................

RE-WRITE FOR DIGITAL SOFT FIRMWARE...........................................................................

ELECTRICAL ADJUSTMENTS..................................................................................................

BLOCK DIAGRAMS

MICON/CHROMA ....................................................................................................................

SD DIGITAL MODULE ............................................................................................................

PRINTED CIRCUIT BOARDS

MAIN ........................................................................................................................................

CRT/VM COIL/DIGITAL ..........................................................................................................

SCHEMATIC DIAGRAMS

MICON .....................................................................................................................................

CHROMA .................................................................................................................................

DEFLECTION ..........................................................................................................................

POWER ...................................................................................................................................

TUNER.....................................................................................................................................

AV/SW/SOUND AMP/TONE CTL ...........................................................................................

COMB FILTER.........................................................................................................................

ASIC.........................................................................................................................................

SDRAM ....................................................................................................................................

FLASH .....................................................................................................................................

FRONT END ............................................................................................................................

AV OUT....................................................................................................................................

CRT/SVM.................................................................................................................................

INTERCONNECTION DIAGRAM ...............................................................................................

WAVEFORMS .............................................................................................................................

MECHANICAL EXPLODED VIEWS...........................................................................................

MECHANICAL REPLACEMENT PARTS LIST .........................................................................

ELECTRICAL REPLACEMENT PARTS LIST...........................................................................

A1-1 A1-1 A1-2 A1-2 A1-2 A2-1 A3-1~A3-5

B1-1 B2-1, B2-2 C-1 C-1, C-2 C-3 D-1~D-6

E-1, E-2 E-3, E-4

F-1~F-4 F-5, F-6

G-1, G-2 G-3, G-4 G-5, G-6 G-7, G-8 G-9, G-10 G-11, G-12 G-13, G-14 G-15, G-16 G-17, G-18 G-19, G-20 G-21, G-22 G-23, G-24 G-25, G-26 G-27, G-28 H-1, H-2 I-1, I-2 J1-1 J2-1~J2-6

A2-1

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 27 inch / 676.0mmV

G-2 Tuning Broadcasting System Analog US System M

G-3 Power Power Source AC 120V AC 60Hz

G-4 Regulation Safety UL

G-5 Temperature Operation +5oC ~ +40oC

G-6 Operating Humidity Less than 80% RH

System CRT Type Flat

Color System NTSC Speaker 2 Speaker

Sound Output MAX

NTSC3.58+4.43 /PAL60Hz No

System Digital ATSC(8VSB), QAM

Tuner and System 1Tuner Receive CH Destination USA(W/ CATV)

Intermediate Digital 44.00MHz Frequency Analog Picture(FP) 45.75MHz

Preset CH No Stereo/Dual TV Sound Yes Tuner Sound Muting Yes

Power Consumption at AC

Protector Power Fuse Yes

Magnetic Field BV/BH +0.45G/0.18G

Position Front Side Size 2.0 x 4.7 Inch Impedance 8 ohm

2.5+2.5 W

10%(Typical) - W

Tuning System F-Synth Input Impedance VHF/UHF 75 ohm

2 - 69, 4A, A-5 - A-1,

CH Coverage A - I, J - W, W+1 - W+84

Sound(FS) 41.25MHz

FP-FS 4.50MHz

140 W at AC 120 V 60 Hz Stand by (at AC) 3 W at AC 120 V 60 Hz Per Year -- kWh/Year

Safety Circuit Yes IC Protector(Micro Fuse) No

Radiation FCC X-Radiation DHHS

Storage -20oC ~ +60oC

A3-1

GENERAL SPECIFICATIONS

G-7 On Screen Menu Yes

G-8 OSD Language English French Spanish

Display Menu Type Icon

Picture Yes

Sound Yes

Set Up Yes

Option

Locks Yes

Control Level Yes

Stereo,Audio Output,SAP Yes Video Yes Color Stream Yes Channel(TV/Cable) Yes CH Label Yes Video Label No Clock Yes Game Timer Yes On/Off Timer Yes Sleep Timer Yes Reset Yes Sound Mute Yes Picture Size Yes V-chip Rating Yes

Mode(Picture preference) No Contrast Yes Brightness Yes Color Yes Tint Yes Sharpness Yes Color Temperature No Reset Yes

MTS Yes Bass Yes Treble Yes Balance Yes BBE On/Off No Stable Sound On/Off Yes Audio Language Yes Digital Output(PCM/Dolby Digital) Yes Surround On/Off Yes Reset Yes

Language Yes Clock Set Yes TV/Cable Yes Auto CH Memory Yes Add/Delete Yes Closed Caption Yes CC Advance(Size, Type, Edge, Yes Color, Background Color) Signal Meter Yes

Yes Favorite CH Yes On/Off Timer Yes CH Label Yes Video Label No

Password Yes V-Chip Yes CH Lock Yes Video Lock Yes Game Timer Yes Front Panel Lock Yes

Volume Yes Brightness Yes Contrast Yes Color Yes Tint Yes Sharpness Yes Bass Yes Treble Yes Balance Yes Back Light No Signal Meter Yes

A3-2

GENERAL SPECIFICATIONS

G-9 Clock and Sleep Timer Max Time 120 Min

G-10 Remote Unit RC-KK

Timer Step 10 Min

Control Glow in Dark Remocon Yes

On/Off Timer Program(On Timer / Off Timer) Yes Timer Back-up (at Power Off Mode) more than -- Min Sec

Back Light Remocon No Remocon Format Toshiba Format Toshiba Custom Code Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 44 Keys Keys Power Yes

1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes 100 /+10/ - Yes CH Up Yes CH Down Yes Volume Up Yes Volume Down Yes TV/Video(Input Select) Yes ENT,CH RTN(Quick View) Yes Menu > / FAV Up Yes Menu < / FAV Down Yes Menu Up Yes Menu Down Yes Mute Yes PIC SIZE (16:9) Yes Sleep Yes Exit Yes Light No

Multi Brand Keys TV Yes

CBL/SAT Yes VCR Yes DVD Yes

(DVD Keys) Enter Yes

DVD Clear Yes Top MENU Yes

(TV / DVD Keys) RECALL(Call) / (Display) Yes

Menu/Enter / DVD MENU Yes

(DVD / VCR Keys) Pause/Still Yes

FF Yes Rew Yes Play Yes Stop Yes <</Skip / Search Forward Yes >>/Skip / Search Forward Yes

(VCR Keys) Rec Yes

TV/VCR Yes

TV:40-BFh

A3-3

GENERAL SPECIFICATIONS

G-11 Features Auto Degauss Yes

G-12 Accessories Owner's Manual Language English /Spanish

Auto Shut Off Yes Canal+ No Cable(CATV) Yes Anti-theft No Rental No Memory(Last CH) Yes Memory(Last Volume) Yes V-Chip(Analog & Digital) Yes

Type

BBE No Auto Search No CH Allocation No SAP Yes Just Clock Function No CH Label Yes VM Circuit Yes Full OSD No Premiere No Comb Filter Yes

Auto CH Memory Yes Hotel Lock No Closed Caption(Analog & Digital) Yes CC Advance Yes Stable Sound Yes FBT Leak Test Protect Yes CH Lock Yes Video Lock Yes Game Timer (Max Time:120 Min) Yes Energy Star No Favorite CH Yes Surround Yes Picture Size Yes Tone Control Yes Video Label No Variable Audio Out No Front Panel Lock Yes QAM Yes Digital Out Dolby Digital Yes

MPEG No PCM Yes DTS No

Zoom Yes

W/ Warranty Yes

Remote Control Unit Yes Rod Antenna

Poles Terminal

Loop Antenna

Terminal -

U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Station List Important Safety Instruction Dew/AHC Caution Sheet AC Plug Adapter Quick Set-up Sheet Battery Yes

UM size x pcs UM-4 x 2 OEM Brand

AC Cord AV Cord (2Pin-1Pin) Registration Card (NDL Card) Yes PTB Sheet ESP Card 300 ohm to 75 ohm Antenna Adapter

USA,Orion Type

3 Lines

No No No No No No No No No No No

No No No

A3-4

GENERAL SPECIFICATIONS

G-13 Interface Switch Front Power Yes

Rear AC/DC No

Indicator Power Yes(RED)

Terminals Front Video Input = VIDEO2

Rear Video Input(Rear1) = VIDEO1

G-14 Set Size Approx. W x D x H (mm) G-15 Weight Net (Approx.) 40.0 kg

G-16 Carton Master Carton

Gift Box Yes

Drop Test

Container Stuffing

G-17 Cabinet Material Cabinet Cabinet Front PS 94V0 DECABROM

PCB Non-Halogen Demand

G-18 Environment Environmental standard requirement (by buyer) Green procurement of Toshiba

Pb-free

System Select No Main Power SW No Sub Power No Channel Up Yes Channel Down Yes Volume Up Yes Volume Down Yes

TV/CATV Selector No Degauss No Main Power SW No

Stand-by No On Timer No

Audio Input = VIDEO2 Other Terminal No

Video Input(Rear2) No Audio Input(Rear1) = VIDEO1 Audio Input(Rear2) No Video Output No Audio Output S Input Yes Color Stream Input (w/ Analog Audio L/R) Digital Audio Out Diversity No Ext Speaker No DC Jack 12V(Center +) No VHF/UHF Antenna Input AC Outlet No

Gross (Approx.) 46.5 kg

Content ---Material -- Dimensions W x D x H(mm) -- x -- x -- Description of Origin

Material Double/Brown Dimensions W x D x H(mm) 850 x 620 x 665 Design As per Buyer's Description of Origin Yes

Height (cm) 40 (ORION SPEC:25)

Cabinet Rear PS 94V0 DECABROM

Eyelet Demand Yes

RCA

RCA x 2 (L/MONO,R)

RCA

RCA x 2 (L/MONO,R)

RCA x 5

Coaxial x 1

F Type

740 x 495 x 574.5

( 88.2lbs) ( 102.5lbs) No Sets /--

Natural Dropping At 1 Corner / 2

Edges / 4 Surfaces

156

Phase3(Phase3A)

Sets/40' container

A3-5

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP

Read the following NOTED items before starting work. *

After turning the power off there might still be a potential voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's potential voltage.

Do not use pliers to loosen or tighten the Anode Cap terminal, this may cause the spring to be damaged.

REMOVAL

1. Follow the steps as follows to discharge the Anode Cap.

(Refer to Fig. 1-1.)

Connect one end of an Alligator Clip to the metal part of a flat-blade screwdriver and the other end to ground. While holding the plastic part of the insulated Screwdriver, touch the support of the Anode with the tip of the Screwdriver. A cracking noise will be heard as the voltage is discharged.

GND on the CRT

3. After one side is removed, pull in the opposite direction to remove the other.

NOTE

Take care not to damage the Rubber Cap.

INSTALLATION

1. Clean the spot where the cap was located with a small amount of alcohol. (Refer to Fig. 1-3.)

Location of Anode Cap

Fig. 1-3

NOTE

Confirm that there is no dirt, dust, etc. at the spot where the cap was located.

2.3.Arrange the wire of the Anode Cap and make sure the wire is not twisted. Turn over the Rubber Cap. (Refer to Fig. 1-4.)

Screwdriver

Alligator Clip

GND on the CRT

Flip up the sides of the Rubber Cap in the direction of the

2. arrow and remove one side of the support.

(Refer to Fig. 1-2.)

Rubber Cap

CRT

Support

CRT

Fig. 1-1

Fig. 1-2

4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 1-5.

Support

CRT

5.6.Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts.

B1-1

Fig. 1-4

Fig. 1-5

DISASSEMBLY INSTRUCTIONS

REMOVAL AND INSTALLATION OF FLAT PACKAGE IC

REMOVAL

Put the Masking Tape (cotton tape) around the Flat

1. Package IC to protect other parts from any damage.

(Refer to Fig. 2-1.) NOTE

Masking is carried out on all the parts located within 10 mm distance from IC leads.

When IC starts moving back and forth easily after

3. desoldering completely, pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.)

NOTE

Some ICs on the PCB are affixed with glue, so be careful not to break or damage the foil of each IC leads or solder lands under the IC when removing it.

Blower type IC desoldering machine

Masking Tape (Cotton Tape)

Heat the IC leads using a blower type IC desoldering

machine. (Refer to Fig. 2-2.)

NOTE

Do not add the rotating and the back and forth directions force on the IC, until IC can move back and forth easily after desoldering the IC leads completely.

Blower type IC desoldering machine

Fig. 2-1

Tweezers

Peel off the Masking Tape.4. Absorb the solder left on the pattern using the Braided

5. Shield Wire. (Refer to Fig. 2-4.)

NOTE

Do not move the Braided Shield Wire in the vertical direction towards the IC pattern.

Fig. 2-3

Braided Shield Wire

Soldering Iron

Fig. 2-2

IC pattern

Fig. 2-4

B2-1

DISASSEMBLY INSTRUCTIONS

INSTALLATION

Take care of the polarity of new IC and then install the new

1. IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

(Refer to Fig. 2-5.)

Soldering Iron

Solder temporarily

Supply the solder from the upper position of IC leads

2. sliding to the lower position of the IC leads. (Refer to Fig. 2-6.)

Solder temporarily

Fig. 2-5

When bridge-soldering between terminals and/or the

4. soldering amount are not enough, resolder using a Thin-tip Soldering Iron. (Refer to Fig. 2-8.)

Thin-tip Soldering Iron

Fig. 2-8

Finally, confirm the soldering status on four sides of the IC

5. using a magnifying glass. Confirm that no abnormality is found on the soldering position and installation position of the parts around the IC. If some abnormality is found, correct by resoldering.

NOTE

When the IC leads are bent during soldering and/or repairing, do not repair the bending of leads. If the bending of leads are repaired, the pattern may be damaged. So, always be sure to replace the IC in this case.

Soldering IronSolder

Supply soldering from upper position to lower position

Fig. 2-6

Absorb the solder left on the lead using the Braided Shield

3. Wire. (Refer to Fig. 2-7.)

NOTE

Do not absorb the solder to excess.

Soldering Iron

Braided Shield Wire

Fig. 2-7

B2-2

SERVICE MODE LIST

This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 2 seconds.

Set Key

VOL. (-) MIN

VOL. (-) MIN 1

VOL. (-) MIN

Remocon Key Operations

Releasing of V-CHIP PASSWORD. Initialization of factory data.

NOTE:

Check of the SUM DATA and MICON VERSION on the screen. Refer to the "

Check for the firmware version. Can be checked of the INITIAL DATA of MEMORY IC.

Refer to the Display of the Adjustment MENU on the screen.

Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).

Do not use this for normal servicing. If you set factory initialization, the memories are reset such as the channel setting, and the POWER ON total hours.

WHEN REPLACING EEPROM (MEMORY) IC

CONFIRMATION OF CHECK SUM, POWER ON TOTAL HOURS, MICON VERSION AND DIGITAL TV MICON FIRMWARE VERSION

Initial total of MEMORY IC, POWER ON total hours, MICON VERSION and Digital TV MICON Firmware VERSION can be checked on the screen. Total hours are displayed in 16 system of notation.

NOTE:

If you set a factory initialization, the total hours is reset to "0". Please refer to "CONFIRMATION OF INITIAL DATA" when SUM DATA is not corresponding.

Turn on the POWER, and set to the TV mode.

Set the VOLUME to minimum.

Press both VOL. DOWN button on the set and Channel button (8) on the remote control for more than 2 seconds.

After the confirmation of each check sum, power on total hours, digital tv micon firware and micon version, turn off the power.

ADDRESS DATA

POWER ON total hours.

= (16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) + (ones digit value)

MICON Version

Digital TV MICON Firmware

Initial setting data check sum.

Rom correction data check sum.

AUDIO External terminal Volume.

CRT ON 0010 OEC7144A_039 DTV d-a61101 INIT 0C02 ROM: -383A VOLUME: 3096

FIG. 1

C-1

WHEN REPLACING EEPROM (MEMORY) IC

If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1.

INI +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B + C + D +E + F

00 C1 A6 0D 07 32 08 02 0A 00 80 07 00 30 36 03 00 10 68 00 11 11 88 88 16 00 00 00 34 06 00 05 AA 00 20 7D 00 00 22 00 04 00 00 00 00 00 00 00 00 00 00 30 31 80 07 22 03 03 00 00 00 01 D0 02 91 13 00 00 40 00 00 00 00 00 00 00 40 40 40 00 40 20 00 40 00 50 40 40 00 00 19 00 0C 00 43 04 11 00 00 00 00 00 60 00 05 12 13 00 82 00 00 00 00 04 00 01 01 01 01

70 00 00 00 14 07 00 63 2F 00 00 00 00 00 00 00 00 C0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 D0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

F0 00 .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..

Table 1

CONFIRMATION OF INITIAL DATA

Enter DATA SET mode by setting VOLUME to minimum.

Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 2 seconds. ADDRESS and DATA should appear as FIG 1.

ADDRESS is now selected and should "blink". Using the UP/DOWN button on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.

Press RIGHT/LEFT button to select DATA. When DATA is selected, it will "blink".

Again, step through the DATA using UP/DOWN button until required DATA value has been selected.

Pressing RIGHT/LEFT button will take you back to ADDRESS for further selection if necessary.

Repeat steps 3 to 6 until all data has been checked.

When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.

After the data input, set to the initializing of shipping.

Turn POWER on.

10.

Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds.

11.

After the finishing of the initializing of shipping, the unit will turn off automatically.

The unit will now have the correct DATA for the new MEMORY IC.

ADDRESS DATA

INIT 00 C1 CRT ON 0010 OEC7144A_039 DTV d-a61101 INIT 0C02 ROM: -383A VOLUME: 3096

FIG. 1

C-2

RE-WRITE FOR DIGITAL SOFT FIRMWARE

JG199JG198 Serial Communication Change JIG

Ref. No.

JG198

JG199

Confirm that the AC cord is plugged out.

1. Using the Serial Communication Change JIG (JG198), connect the set to personal computer. (Refer to Fig. 1)

NOTE: It is possible to write only with the personal computer of WINDOWS.

Part No.

APJG198000

APJG199000

APJG176093JG176

Parts Name

Serial Communication Change JIG

Flash UP-Date Soft Disc USA SD DTV ROM

DISC

Flash UP-Date Soft Disc

Connect the set to personal computer

Up-Date of the Firmware

JG176

USA SD DTV ROM DISC

Remarks

Fig. 1

Using the Flash UP-Date Soft Disc (JG199) and USA SD DTV ROM DISC (JG176), please Re-write the DIGITAL SOFT FIRMWARE. The operating manual for Re-writing is included in Flash UP-Date Soft Disc (JG199).

C-3

ELECTRICAL ADJUSTMENTS

1. ADJUSTMENT PROCEDURE

Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.

CAUTION

•

Use an isolation transformer when performing any service on this chassis.

•

Before removing the anode cap, discharge electricity because it contains high voltage.

•

When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position.

•

When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor.)

Prepare the following measurement tools for electrical adjustments.

1. Oscilloscope

2. Digital Voltmeter

3. Multi-sound Generator

4. Pattern Generator

On-Screen Display Adjustment

1. In the condition of NO indication on the screen. Press the VOL. DOWN button on the set and the Channel button (9) on the remote control for more than 2 seconds to appear the adjustment mode on the screen as shown in Fig. 1-1.

TV-A

4:3

FUNCTION

NO.

00 01 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20

OSD H OSD C H.POSI H BLK L H BLK R V. SIZE V. POSI V. LIN VS CORR V COMP R.BIAS G.BIAS B.BIAS R.DRV G.DRV B.DRV BRI.CENT BRI.MAX BRI.MIN CONT.CENT

NO.

FUNCTION

CONT.MAX

CONT.MIN

COL.CENT

COL.MAX

COL.MIN

TINT CENT

SHARP.CENT

SHARP.MAX

SHARP.MIN

SUB BIAS

H.SIZE

PARABOLA

TRAPEZIUM

COR TOP

COR BTM

TEST STEREO

TEST AUDIO

H FREQ

Fig. 1-2

2. BASIC ADJUSTMENTS

2-1: CONSTANT VOLTAGE

Place the set in AV MODE without signal.

Connect the digital voltmeter to the TP003.

Adjust the VR502 until the digital voltmeter is 130 ± 0.5V.

2-2: CUT OFF

Place the set in Aging Test for more than 15 minutes.

Place the set in AV MODE without signal.

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (02) on the remote control to select “CUT OFF”.

Adjust the Screen Volume until a dim raster is obtained.

2-3: FOCUS

Receive the monoscope pattern.

Turn the Focus Volume fully counterclockwise once.

Adjust the Focus Volume until picture is distinct.

00 OSD H

Use the Channel UP/DOWN button or Channel button

(0-9) on the remote control to select the options shown in Fig. 1-2.

Press the MENU button on the remote control to end the adjustments.

To display the adjustment screen for AV, CS and DIGITAL mode, press the TV/VIDEO button on the remote control to set to the AV, CS and DIGITAL mode. Press the VOL.DOWN button on the set and the channel (9) on the remote control for more than 2 seconds.

Fig. 1-1

2-4: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment.

Place the set in Aging Test for more than 15 minutes.

1. Receive the white 100% signal from the Pattern

2. Generator. Using the adjustment control, set the brightness and

3. contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and

4. press the channel button (11) on the remote control to select "R.BIAS". Using the VOL. UP/DOWN button on the remote control,

5. adjust the R.BIAS. Press the CH. UP/DOWN button on the remote control to

6. select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS". Using the VOL. UP/DOWN button on the remote control,

7. adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS. Perform the above adjustments 6 and 7 until the white

8. color is achieved.

D-1

+ 36 hidden pages