TOSHIBA 27A41 Service manual

SERVICE MANUAL

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COLOR TELEVISION

FILE NO. 050-200109

27A41

SERVICING NOTICES ON CHECKING

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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

Earphone 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

Inferior silicon grease can damage IC's and transistors. When replacing an IC's or transistors, use only specified silicon grease (YG6260M). Remove all old silicon before applying new silicon.

GENERAL SPECIFICATIONS

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G-1 TV CRT CRT Size / Visual Size 27 inch / 676mmV

G-2 Tuning Broadcasting System 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 then 80% RH

System CRT Type Normal

Color System NTSC Speaker 2Speaker

Sound Output MAX

NTSC3.58+4.43 /PAL60Hz No

System Tuner and System 1Tuner

Receive CH Destination Ohers

Intermediate Picture(FP) 45.75MHz Frequency Sound(FS) 41.25MHz

Preset CH Stereo/Dual TV Sound Yes Tuner Sound Muting Yes

Power Consumption at AC

Protector Power Fuse Yes

Deflection 102 degree Magnetic Field BV/BH +0.45G/0.18G

Position Front Size Impedance 8 ohm

10%(Typical) 2.0 + 2.0 W

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

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

FP-FS 4.50MHz

DC -

Stand by (at AC) 4 W at AC 120 V 60 Hz Per Year -- kWh/Year

Radiation FCC X-Radiation DHHS

Storage -20oC ~ +60oC

2.0 x 3.5 Inch

120 W at AC 120 V 60 Hz

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

2.5 + 2.5 W

GENERAL SPECIFICATIONS

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G-7 On Screen Menu Yes

G-8 OSD Language English French Spanish

G-9 Clock and Sleep Timer Max Time 120 Min

Display Menu Type Icon

Timer Step 10 Min

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

Picture Yes

Contrast Yes Brightness Yes Color Yes Tint Yes Sharpness Yes

Sound Yes

Bass Yes Treble Yes Balance Yes BBE On/Off No Stable Sound On/Off Yes

Set Up Yes

TV/CABLE(CATV) Yes CH Program Yes Add/Erase Yes

Option Yes

Language Yes V-chip Yes CH Label Yes Favorite CH Yes Color Stream DVD/DTV Yes

Control Level Yes

Volume Yes Brightness Yes Contrast Yes Color Yes Tint (NTSC Only) Yes Sharpness Yes Tuning No Bass Yes Treble Yes Balance Yes

Back Light No Stereo,Audio Output,SAP Yes Video Yes Color Stream Yes Channel(TV/Cable) Yes CH Label Yes Sleep Timer Yes Sound Mute Yes P-in-P No V-chip Rating Yes

OSD Language Setting English

No No

GENERAL SPECIFICATIONS

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G-10 Remote Unit RC-DU

Control Glow in Dark Remocon Yes

Format Toshiba Custom Code TV:40-BF h Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 42 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 Yes

CH Up Yes

CH Down Yes

Volume Up Yes

Volume Down Yes

TV/Caption/Text Yes

CH1/CH2 Yes

TV/Video(TV/AV) Yes

CH RTN/CH ENT(Quick View) Yes

Sleep Yes

RE Call(Call) Yes

Reset Yes

Menu/Enter Yes

Mute Yes

Exit Yes

MTS(Audio Select) Yes

Fav.Up Yes

Fav.Down Yes

Set + No

Set - No

P-in-P Keys PIP No

Swap No

Locate No

Still No

2 Tuner PIP CH Up No P-in-P Only PIP CH Down No Multi Brand Keys CH Up(VCR) Yes

CH Down(VCR) Yes

Pause/Still Yes

TV/VCR(VCR) Yes

Code Yes

FF Yes

Rew Yes

Rec Yes

Play Yes

Stop Yes

TV Yes

VCR Yes

Cable Yes

GENERAL SPECIFICATIONS

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G-11 Features Auto Degauss Yes

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

Type USA,Toshiba Type

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

2 Lines Auto CH Memory Yes Hotel Lock No Closed Caption Yes Stable Sound Yes FBT Leak Test Protect Yes Favorite CH Yes 1 Tuner P-in-P No 2 Tuner P-in-P No

G-12 Accessories Owner's Manual Language English

W/ Warranty Yes Remote Control Unit Yes Rod Antenna No

Poles

Terminal Loop Antenna

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

UM size x pcs UM4 size x 2

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

No No No No No No No

No No No

No No

GENERAL SPECIFICATIONS

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G-13 Interface Switch Front Power Yes

Rear AC/DC No

Indicator Power Yes

Terminals Front Video Input

Rear Video Input(Rear1)

G-14 Set Size Approx. W x D x H (mm) 650 x 500.5 x 560 G-15 Weight Net (Approx.) 35kg

G-16 Carton Master Carton

Gift Box Yes

Drop Test

Container Stuffing 192

G-17 Cabinet Material Cabinet Front PS 94V0 DECABROM

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

Other Terminal No

Video Input(Rear2)

Audio Input(Rear1)

Audio Input(Rear2)

Video Output

Audio Output

S- Input Yes

Euro Scart No

Color Stream

Diversity No

Ext Speaker No

DC Jack 12V(Center +) No

VHF/UHF Antenna Input

AC Outlet No

Gross (Approx.) 38Kg

Content ----

Material --

Dimensions W x D x H(mm) -- x -- x --

Description of Origin

Material Double/Brown

Dimensions W x D x H(mm) 718 x 580 x 655

Design As per Buyer's

Description of Origin Yes

Height (cm) 31

Cabinet Rear PS 94V0 DECABROM

RCA RCA x 2

RCA RCA RCA x 2 RCA x 2 RCA RCA x 2

RCA x 3

F Type

Natural Dropping At 1 Corner / 3 Edges / 6 Surfaces

( 77.1 lbs) ( 83.7 lbs) No Sets /--

Sets/40' container

DISASSEMBLY INSTRUCTIONS

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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

Fig. 1-4

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.

Fig. 1-5

SERVICE MODE LIST

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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 1 second.

Set Key Remocon Key Operations

VOL. (-) MIN

Releasing of V-CHIP PASSWORD.

VOL. (-) MIN 1

VOL. (-) MIN 6

VOL. (-) MIN 8

VOL. (-) MIN

Initialization of the factory. NOTE: Do not use this for the normal servicing.

POWER ON total hours is displayed on the screen. Refer to the "CONFIRMATION OF USING HOURS".

Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "NOTE FOR THE REPLACING OF MEMORY IC".

Writing of EEPROM initial data. NOTE: Do not use this for the normal servicing.

Display of the Adjustment MENU on the screen. Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).

CONFIRMATION OF USING HOURS

POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.

Set the VOLUME to minimum.

Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.

After the confirmation of using hours, turn off the power.

ADDRESS DATA

INIT 00 83 CRT ON

0010

FIG. 1

Initial setting content of MEMORY IC. 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)

NOTE FOR THE REPLACING OF 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.

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 A9 C3 37 30 31 B3 27 17 BB 88

00 44 84 00 00 00 5F

0F --- --- --- --- --- --- --- ---

Enter DATA SET mode by setting VOLUME to minimum.

1. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.

2. ADDRESS and DATA should appear as FIG 1. ADDRESS is now selected and should "blink". Using the VOL. UP/DOWN button on the remote, step through the

3. ADDRESS until required ADDRESS to be changed is reached. Press ENTER to select DATA. When DATA is selected, it will "blink".

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

5. Pressing ENTER will take you back to ADDRESS for further selection if necessary.

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

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

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

---

Table 1

+B +C +D +E +FINI

--- --- --- --- --- ---

ELECTRICAL ADJUSTMENTS

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1. ADJUSTMENTS

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. Inferior silicon grease can damage IC's and transistors.

•

When replacing IC's and transistors, use only specified silicon grease. Remove all old silicon before applying new silicon.

Prepare the following measurement tools for electrical adjustments.

1. Oscilloscope

2. Digital Voltmeter

3. AC Voltmeter

On-Screen Display Adjustment

In the condition of NO indication on the screen.

1. Press the VOL. DOWN button on the set and the Channel button (9) on the remote control for more than 1 second to appear the adjustment mode on the screen as shown in Fig. 1-1.

00 OSD 15

Fig. 1-1

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.

2. BASIC ADJUSTMENTSBEFORE MAKING ELECTRICAL

2-1: CONSTANT VOLTAGE

Set condition is AV MODE without signal.

Connect the digital voltmeter to TP002.

Adjust the VR502 until the digital voltmeter is 135 ± 0.5V.

2-2: RF AGC

Receive the VHF LOW (61dB).

Connect the digital voltmeter between the TP001 and the GND.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (02) on the remote control to select "RF. AGC".

Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.4V.

2-3: CUT OFF

Adjust the unit to the following settings. G. DRIVE=64, B. DRIVE=64, R. BIAS=15, G. BIAS=15, B. BIAS=15, BRIGHT=75, UNI COLOR=64

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

Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "CUT OFF".

Adjust the Screen Volume until a dim raster is obtained.

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

Place the set with Aging Test for more than 10 minutes.

Receive the white 100% signal from the Pattern Generator.

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

Activate the adjustment mode display of Fig. 1-1 and press the channel button (13) on the remote control to select "R. BIAS".

Using the VOL. UP/DOWN button on the remote control, adjust the R. BIAS.

Press the CH. UP/DOWN button on the remote control to select the "G. DRV", "B. DRV", "G. BIAS" or "B. BIAS".

Using the VOL. UP/DOWN button on the remote control, adjust the G. DRV, B. DRV, G. BIAS or B. BIAS.

Perform the above adjustments 6 and 7 until the white color is looked like a white.

NO.

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16

FUNCTION

OSD H CUT OFF RF. AGC

--H. POSI V. POSI H. SIZE V. SIZE V. CENT V. LIN VS. CORR G. DRV B. DRV R. BIAS G. BIAS B. BIAS BRI

NO.

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

FUNCTION

SUBCONT UNI COL

--TINT SHARP RGB CONT PARABOLA TRAPEZIU COR TOP COR BTM V EHT H EHT FM. LVL LEVEL SEP1 SEP2 T. STE

Fig. 1-2

2-5: FOCUS

Receive a 70dB monoscope pattern.

Turn the Focus Volume fully counterclockwise once.

Adjust the Focus Volume until picture is distinct.

2-6: HORIZONTAL POSITION

Receive the center cross signal from the Pattern Generator.

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 (04) on the remote control to select "H. POSI".

Press the VOL. UP/DOWN button on the remote control until the right and left screen size of the vertical line becomes the same.

ELECTRICAL ADJUSTMENTS

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2-7: VERTICAL LINEALITY NOTE: Adjust after performing adjustments in section 2-6.

Receive the center cross signal from the Pattern Generator.

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 (09) on the remote control to select "V. LIN".

Press the VOL. UP/DOWN button on the remote control until the upside and downside screen size of the horizontal line becomes the same.

2-8: VERTICAL POSITION NOTE: Adjust after performing adjustments in section 2-7.

1.2.Receive the center cross signal from the Pattern Generator. Adjust the VR401 until the horizontal line becomes fit to the notch of the shadow mask.

2-9: VERTICAL SIZE NOTE: Adjust after performing adjustments in section 2-8.

Receive the crosshatch signal from the Pattern Generator.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (07) on the remote control to select "V. SIZE".

Press the VOL. UP/DOWN button on the remote control until the rectangle on the center of the screen becomes square.

Receive a broadcast and check if the picture is normal.

2-10: OSD HORIZONTAL

1.2.Activate the adjustment mode display of Fig. 1-1. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum.

(Refer to Fig. 2-1)

00 OSD 15

2-11: LEVEL

Receive a 70dB monoscope pattern.

Connect the AC voltmeter to TP901.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (30) on the remote control to select "LEVEL".

Press the VOL. UP/DOWN button on the remote control until the AC voltmeter is 75 ± 2mV.

Fig. 2-1

2-12: SEPARATION 1, 2

Receive the stereo signal (L=2KHz, R=400Hz).

1. Connect the AC voltmeter to AUDIO OUT JACK though

2. stereo filter (L=400Hz, R=2KHz). Activate the adjustment mode display of Fig. 1-1 and

3. press the channel button (31) on the remote control to select "SEP1". Press the VOL. UP/DOWN button on the remote control

4. until the output of L-CH and R-CH become minimum. Press the CH UP button once the set to "SEP2" mode.

5. Press the VOL. UP/DOWN button on the remote control

6. until the output of L-CH and R-CH become minimum. Press the CH DOWN button once the set to "SEP1"

7. mode. Repeat step 4 to step 7 several times.

8. The output difference of the between with Filter and without Filter should be more than 25db for both L and R.

2-13: BRIGHTNESS

Activate the adjustment mode display of Fig. 1-1 and press the channel button (16) on the remote control to select "BRI".

Press the VOL. UP/DOWN button on the remote control until the brightness step No. becomes "92"

Press the TV/VIDEO button on the remote control to set to the AV mode. Then perform the above adjustments 1~2.

Press the TV/VIDEO button on the remote control to set to the CS mode.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (16) on the remote control to select "BRI".

Press the VOL. UP/DOWN button on the remote control until the brightness step No. becomes "90"

2-14: UNI-COLOR

Activate the adjustment mode display of Fig. 1-1 and press the channel button (18) on the remote control to select "UNI COL".

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "54"

Press the TV/VIDEO button on the remote control to set to the AV mode.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (18) on the remote control to select "UNI COL".

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "58"

Press the TV/VIDEO button on the remote control to set to the CS mode.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (18) on the remote control to select "UNI COL".

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "60"

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