Panasonic TC-21L100R Service Manual

Colour Television

TC-21L100R TC-21W2 TX-21W2T

MX-5 Chassis

ORDER NO. MTV9707056C3

Specification

Power Source : AC 110-240V, 50/60Hz Power Consumption : 98W Aerial Impedance: 75Ω unbalanced, Coaxial type Receiving System : 17 System Receiving Channels : VHF 1-11 PAL B (Australia &

N.Zealand) 1-12 (PAL/SECAM D)

1-12 (NTSC M JAPAN) 2-12

(PAL/SECAM B,G) 2-13 NTSC M

U.S.A

UHF 21-69 PAL G I/SECAM B,G,K1)28-

69 PAL G (Australia) 13-56 PAL

D13-52 NTSC M JAPAN14-69

NTSC M U.S.A. CATV S1-S41 (Hyper) Intermediate Frequency : Video 38.0 MHz Sound 31.5 MHz (D,K,K1) 32.0MHz (I)

32.5 MHz (B, G) 33.5MHz (M)

Colour 33.57 MHz (PAL)33.6 MHz

(SECAM) 33.75 MHz (SECAM)34.42 MHz (NTSC)

Receiving Stereo Sound System : AV STERE O / TEXT Video / Audio Terminals : FAV In Video In 1 Vp-p 75Ω Audio In

Approx. 400mVrms

RAV In Video In 1 Vp-p 75Ω Audio In

Approx. 400mVrms

Monitor Out : Video Out 1 Vp-p 75ΩAudio Out

Approx. 400mVrms

High Voltage : 28.5 kV (+1.2, -1.5)at zero beam

current

Picture Tube : A51JXS064X 54 cm (21

inches)Measured diagonally, 90°

deflection Audio Output : Speaker : 5.0W 8Ω Dimensions : Height : 530.6 mmWidth : 580. 0

mmDepth : 486.0 mm Mass : 22.0 kg (Net Wt .) Remote Controller : 27 Functions infrared controller 38

Functions infrared controller

Specifications are subject to change without notice. Mass and dimensions shown are approximate.

TC-21L100R / TC-21W2 / TX-21W2T

CONTENTS

Page Page

1 Safety Precautions 3

1.1. General Guide

1.2. Leakage Current Cold Check

1.3. Leakage Current Hot Check (See Fig. 1)

1.4. X-Radiation

1.5. Shut Down Circuit Test

2 MX-5 Chassis Block Diagram

2.1. The I2C Bus Concept :

3 Service Hints

3.1. Service Position for E-Board

3.2. Purpose of Hotel Mode

3 3 3 3 3

4 5

3.3. How to set the Factory Mode for adjustment

4 Adjustment Procedure 5 CONDUCTOR VIEWSE-BOARD TNP4G066AC

TNP4G066AA 13 6 TEST POINT WAVEFORMS 7 BLOCK DIAGRAM FOR INTEGRATED CIRCUITS 8 Schematic Diagram for models TC-15PM10R (MX-7 Chassis)

9 Schematic 1 10 Replaceme nt Parts List

15 16

17 21 27

TC-21L100R / TC-21W2 / TX-21W2T

1 Safety Precautions

1.1. General Guide

1. It is advisable to insert an isolation transformer in the AC supply before servicing this hot chassis.

2. When servicing, observe the original lead dress, especially the lead dress in the high voltage circuits. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

3. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers, shields, and isolation R-C combinations, are properly installed.

4. When the receiver is not to be used for a long period of time, unplug the power cord from the AC cord outlet.

5. Potential, as high as is in operation. Operation of the receiver without the rear cover involves the danger of a shock hazard from the receiver power supply. Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the picture tube to the receiver chassis before handling the tube.

6. After servicing make thefollowing leakage current checks to prevent the customer from being exposed to shock hazards.

1.2. Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the two prongs on the plug.

2. Turn on the receiver’s power switch.

3. Measure the resistance value, with an ohmmeter, between the jumper AC plug and each exposed metallic cabinet part on the receiver, such as screw heads, aerials, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be between

and 20 M

ΩΩΩΩ

return path to the chassis, the reading must be infinite.

1.3. Leakage Current Hot Check

(See Fig. 1)

1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2. Connect a 2kΩ, non-inductive resistor and an AC/DC current meter, in series with each exposed metallic part on the receiver in turn and an earth such as a water pipe.

3. The current from any point should not exceed 0.7 mA peak AC or 2mA DC. In the case of a measurement being outside of the limits specified, there is a possibility of a

29.7

kV. is present when this receiver

ΩΩΩΩ

. When the exposed metal does not have a

shock hazard, and the receiver should be repaired and rechecked before it is returned to the customer.

Fig. 1 Hot-Check Circuit

1.4. X-Radiation

Warning : The potential sources of X-Radiation in TV sets are the EHT section and the picture tube.

When using a picture tube test rig for service, ensure that the rig is capable of handling 29.7 kV without causing X-Radiation.

Note:

It is important to use an accurate periodically calibrated

high voltage meter.

1. Set the brightness to minimum.

2. Use the remocon to get into SERVICE mode. (Refer to Pg.

3. Measure the EHT. The meter reading should indicate

(+1.2, -1.5) kV

immediate service and correction is required to prevent the possibility of premature component failure.

4. To prevent the possibility of X-Radiation, it is essential to use the specified picture tube, if service replacement becomes necessary.

. If the meter indication is out of tolerance,

1.5. Shut Down Circuit Test

This test must be made as a final check before the set is

returned to the customer.

1. Operate the TV set.

2. Set Controls:

Screen (on FBT) ..... minimum

Contrast................... minimu m

Colour........................ minimum

3. Connect a DC voltmeter to cathode of D591, and confirm that the voltage reading is 24.1 V or less.

4. Supply 25.3 V DC to cathode of D591 and confirm that the shut down circuit does not operate.

5. Supply 27.94 V DC to cathode of D591 and confirm that the shut down circuit operates.

6. Switch the set off and disconnect the DC supply. Switch the set on and Normalize the contrast and colour.

28.5

TC-21L100R / TC-21W2 / TX-21W2T

2 MX-5 Chassis Block Diagram

2.1. The I2C Bus Concept :

A. Features

1. The I

2. It allows bi-directional data transfer between ICs.

3. It consists of a master and one or more slave ICs.

C bus is a 2-wire serial bus consisting of a clock line (SCL) and a data line (SDA).

- The master initiates transfer and generates clock signals.

- The slave is the IC addressed by a master. It allows bi-directional data transfer between ICs.

3 Service Hints

3.1. Service Position for E-Board

1. Remove the back cover.

2. Stand the TV set as shown in fig. 7.

3. Remov e the E-Board from the TV set by pulling the main board out as shown in fig. 7.

Fig. 7

TC-21L100R / TC-21W2 / TX-21W2T

3.2. Purpose of Hotel Mode

To limit the level of main functions of TV such as Volume, Brightness, Tone, Sharpness, Colour and Contrast for hotel use. How to Set To set the hotel mode, press VOLUME 15 DAC on the TV and TIMER SETTING 30

MIN on the remote control and press channel up on the TV and press recall on the remote control in the same time simultaneously as shown in figure 8.

How to Cancel To cancel the hotel mode, press VOLUME (-) DOWN on the TV and OFF-TIMER on the

remote control simultaneously as shown in figure 8.

3.3. How to set the Factory Mode for adjustment

Follow the steps shown in the block diagram below to set the Factory Mode for sub-colour; sub-bright, sub-contrast; RGB low-light and RGB high-light adjustments and return to Normal mode after adjustment. When the IC601 (VCJ) or IC1104 are replaced, these adjustments must be done as below.

3.3.1. The Sub Adjustment mode

Fig. 9

A: Press the Timer button setting 30 min then press Recall button together with volume

down. Vol must be “0” dac. The TV in the Normal mode change to check mode. “CHK” will appear on the screen as shown in Fig. 9.

B: Press button Remote 1,2,3,4 and 5 to select the required adjustment to be adjusted as

shown in Fig. 9. Press the Volume “up” or “down” button to change the level.

C: Press the Normal button on the remote control transmitter twice to return to Normal

mode.

TC-21L100R / TC-21W2 / TX-21W2T

3.3.2. The CRT Adjustment mode

Fig. 9a

A: Press the Timer button setting 30 min then press Recall button together with volume

down. Then press button remote to select “CHK 5”. The TV in the Normal mode changes to the CRT Adjust ment mode. Press the remote button volume up or down to select the required adjustment as shown in Fig. 9a. (Please refer to procedure on page 11)

B: Press the Normal button on the remote control transmitter twice to return to Normal

mode.

3.3.3. The White Balance Adjustment mode.

Fig. 9b

A: Press the Timer button setting 30 min then press Recall button together with volume

down.

B: Then press the remote button number 5 to enter White Balance Adjustment mode.

(Please refer to procedure on page 11). Press the Volume button to change the level.

C: Press the Normal button on the remote control twice to return to Normal mode or press

on/off button.

4 Adjustment Procedure

Item / Preparation Adjustment Procedure

B Voltage

1. Operate the TV set.

2. Set control as follows:

Brightness.............minimum

Contrast.................minimum

RF AGC

1. Workshop a. Receive a colour bar signal at an RF level of 61±2dB with 75Ω

loaded.

b. Connect an oscilloscope to TPE 23, set to DC mode.

2. B Field a. Receive the television broadcast channel known to have the

weakest RF signal strength.

Confirm the DC voltages at the indicated test points are as follows: FBT PIN 9 : 90.0 ± 2.0V IC851 PIN 3 : 9 ± 1.0V IC852 PIN 3 : 5 ± 0.5V E33-1 : 190.0 ± 15V D580 Cathode : 22.0 ± 2.0V D580 Cathode : 46.0 ± 2.5V

1. Select “RF” indication on screen by using remote control at factory mode.

2. Set RF AGC using remote control volume (+) or volume (-) button until voltage at TPE 23 starts decreasing or until less than 0.2V from max.

3. Increase RF signal strength by 2dB, confirm that TPE 23 voltage drops more than 1V.

TC-21L100R / TC-21W2 / TX-21W2T

High Voltage

1. Operate the TV set.

2. Set control as follows:

Brightness.............minimum

Contrast.................minimum

M-NTSC Sub-Tint Adjustment Apply NTSC rainbow pattern. Connect an oscilloscope to TPE28. Connect a short jumper between TPE3 and TPE10. Press S1107 (FUNC.) and set System to NTSC 4.43

Colour.....................NORMAL or CENTRE

Brightness...............NORMAL or CENTRE

Contrast..................NORMAL or MAX.

Tint.........................NORMAL or CENTRE Press RECALL button on

remote control, then press S1110 (VOL. DOWN) to Sub-Tint. Confirm CHK display on screen.

1. Connect a DC voltage meter to Pin 1 of IC801 and confirm the voltage is 90.0 ± 2.0V.

2. Connect a high voltage meter to anode of the picture tube.

3. Confirm that the high voltage is within the range of 24.5 (+ 0.7, -

1.5) kV.

4. Normalize the brightness and contrast.

Confirm the amplitude of waveform : 1.4 ± 0.5V

1. Adjust Sub-Tint so that No. 2,3 and 4 becomes level waveform similar to Fig. 10.

2. Confirm TPE 28 (R-out) is

1.4 ± 0.5V.

Return to user mode.

3. Confirm phase at Tint is changed more than ±30 by Tint control.

4. Confirm that colour level is maximum when colour DAC is adjusted to maximum position.

Note: Use Remote control only when adjusting User Control.

TC-21L100R / TC-21W2 / TX-21W2T

Item / Preparation Waveforms Video-input, Sub-Contrast, Sub-Brightness and Sub-

Colour Input a colour bar signal with white at 100% of peak level. Connection can be made via A/V and this may enable adjustment of the pattern generator video output level to obtain the correct black to white amplitude (at TPE 11)

Confirm that the Sync tip to white amplitude is 1.0±

0.05 Vp-p at Pin 38 (under IC601) as shown in Fig.

13. Receive a colour bar pattern. Connect an

oscilloscope to pin 3 of E-32 on the E-Board and chassis earth.

Set Colour, Brightness and Contrast to Normal (Colour and Brightness at centre, Contrast at max.)

Connect a short jumper between TPE3 and TPE10 (chassis). Note that this step disables the ABL so avoid operation in this condition for long periods at high beam current.

Press the RECALL button on remote control together with volume down button. The screen should then show a flat whitish field with the OSD message “CHK” possibly visible at the top as shown in Fig. 14.

Press the Function button (S1107) to select the required function to be adjusted (in this case “Contrast”)

Now press either the Volume “up or down” buttons (S1110 or S1111). “S” and “Contrast” will be displayed on the screen, indicating “Sub” Contrast, and the Sub-Contrast level will be changed. Note that the Volume “up or down” buttons must be pressed while the Function (i.e. Contrast) OSD is still on screen.

Press the Function button (S1107) to select Brightness and then Volume “up or down” buttons (S1110 or S1111) will similarly permit Sub-Brightness to be altered and adjusted.

Adjust the Sub-Brightness (first) and Sub-Contrast (second) to produce the waveform shown in Fig. 15

Using the Function button (S1107) and Volume “up and down” buttons (S1110 and S1111). Select Subcolour and adjust to produce the waveform shown in Fig. 16.

Cancel the “CHK” mode by pressing the NORMAL button on remote control transmitter and remove the TPE3 to TPE10 jumper.

Item / Preparation Adjustment Procedure CRT CUT-OFF

1. Input a flat white Field signal and set Contrast to maximum.

2. Connect an oscilloscope to TPY 1 (Green CRT drive) and TPY 2 (Ground). TPY 1 and TPY 2 are located on the Y-PCB (CRT neck panel).

3. Press “Timer” to setting 30 min then set vol min. Press button volume - together with remote button recall to select CRT ADJUSTMENT Mode (shown in Fig. 9a on page 8). “CHK” will appear on the screen.

4. Press the remote button number 3 to select “BR” (meaning “brightness”). Note that repeated pushing of the Function button cycles through the CRT adjustment as shown in Fig. 16.

5. While “BR” is still on screen, set the screen control to minimum by turning it anti-clockwise and use the Volume “up” or “down” remote button to set the DC=0V to video level at 160V as shown in Fig. 17.

6. Advance the screen control sufficiently to see the OSD. While “BR” is still on screen, press number 5 button on the remote control. This will collapse the vertical scan.

7. Slowly adjust the screen control such that one of the R, G or B beams just appears across the centre of the screen. (Fig. 19). This is the setting point for the screen control. Note which colour appeared and do not adjust the low light setting for this particular colour in the following procedure.

TC-21L100R / TC-21W2 / TX-21W2T

Item / Preparation Adjustment Procedure R, G, B LOW LIGHT ADJUSTMENT

1. Complete steps 1 to 7 of the CRT cut-off procedure, and do not adjust the screen control from here on.

2. Press the remote button number 3 to return to full field scan, and use the Remote button to select the lowlight setting for one of the two colours (R,G or B) that did not appear at step 7. Fig. 16 shows the selection sequence of the Function Switch (S1107)

3. With the R_,B_ or G_ OSD still on screen, press the remote button number 5 again to collapse the vertical scan.

4. Use the Volume “up” and “down” remote button to match the levels of the two colours now on screen.

5. Repeat Steps 9 to 11 for the remaining colour, to achieve a white line on screen.

6. Press the button number 5 to return to full frame scan.

R, B HIGH LIGHT ADJUSTMENT

1. Press the Normal Button on the remote control transmitter twice to return to Normal Mode, after completing the preceding CRT cut-off and lowlight adjustments.

2. Set Contrast to Normal (max) and continue using the flast white field input as per Step 1.

3. Press the timer button setting 30 min then press Volume down button and recall together. Then press button number 5.

4. Use the Button number 3 to select R (red highlight) and B (blue highlight) as necessary (refer to Fig 16).

5. With R

or B-still on screen, press the Volume button “up” and “down” as necessary to achieve a uniform white field.

6. Press the Normal Button on the remote control transmitter twice to return to Normal Mode.

7. Input a greyscale pattern and confirm correct lowlight and highlight white balance.

Before Colour Purity, Convergence and White Balance adjustments are attempted

V. Height, H. Centre and Focus adjustments must be completed.

TC-21L100R / TC-21W2 / TX-21W2T

Colour Purity

1. Set the Brightness and Contrast controls to their maximum positions.

2. Operate the TV set for 30 minutes.

3. Fully degauss the picture tube by using an external degaussing coil.

4. Apply a crosshatch pattern signal and adjust the static convergence magnets to the approximately correct position.

5. Receive a black and white signal.

6. Set the controls as follows:

Red...........................maximum

Green.......................maximum

Blue.............................minimum

Press the SHIPPING button on the remote control twice to select CRT Adjustment Mode and then the Function button (S1107) as per Fig. 16 to select low lights.

7. Loosen the clamp screw for the deflection yoke A in Fig. 24 and move the deflection yoke as close to the purity magnet as possible.

8. Adjust the purity magnetic rings so that a vertical green field is obtained at the centre of the screen.

Convergence

1. Apply a crosshatch pattern signal and Normalize Contrast control to the maximum position.

2. Adjust Brightness until the grey portion of the crosshatch pattern just becomes black.

3. Adjust the Red and Blue line at the centre of the screen by rotating the R-B static convergence magnetic rings.

Fig. 20

9. Slowly push the deflection yoke and set it where a uniform green field is obtained.

10. Re-adjust the Low Light controls to their correct settings and make sure that a uniform white field is obtained.

11. Tighten the clamp screw A in Fig. 24.

Fig. 22

4. Adjust Red and Blue with the Green line at centre of the screen by rotating (RB) -G static convergence magnetic rings.

5. Lock convergence magnets with silicone sealer.

6. Remove the DY wedges and slightly tilt the deflection yoke vertically and horizontally to obtain the good overall convergence.

Fig. 23

7. Fix the deflection yoke by re-inserting the DYwedges. Refer to Fig. 24.

8. If purity error is found, repeat “Colour Purity” adjustment.

TC-21L100R / TC-21W2 / TX-21W2T

Fig. 24

Notes:

1. Wedge A, B and C should be inserted following the sequence of 1, 2 and 3 shown in Fig. 25.

2. The wedges should be set 120° apart from each other.

3. Be certain that the four wedges are firmly fixed and the Deflection Yoke is tightly clamped in place. Otherwise the Deflection Yoke may shift its position and cause a loss of convergence and purity.

Fig. 25

5 CONDUCTOR VIEWS

E-BOARD TNP4G066AC

TNP4G066AA

TC-21L100R / TC-21W2 / TX-21W2T

6 TEST POINT WAVEFORMS

TC-21L100R / TC-21W2 / TX-21W2T

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