Panasonic TC-21FX20RG Manual de usuario

Power Source : AC AUTO 110-240V, 50/60 Hz

Power Consumption : 58W

Aerial Impedance : 75Ωunbalanced

Coaxial type

Receiving System : 17 Systems

Receiving Channels :

VHF 2-12 PAL / SECAM B,K1

0-12 PAL B (N ZEALAND)

1-9 PAL B (N ZEALAND)

1-12 PAL / SECAM D

1-12 NTSC M (JAPAN)

2-13 NTSC M (U.S.A)

UHF 21-69 PAL G,H,I / SECAM G.K.KI

28-69 PAL B (Australia)

13-57 PAL D,K

13-62 NTSC M (JAPAN)

14-69 NTSC M (U.S.A)

CATV S1-S20 (OSCAR)

1-125 (U.S.A CATV)

C13-C49 (JAPAN)

Z1-Z37 (CHINA)

5A,9A (AUSTRALIA)

S21-S41 (HYPER)

Audio Terminal :

DVD

rights reserved. Unauthorized copying and

distribution is a violation of law.

TC-21FX20RG

GL1 Chassis

Y1.0 Vp-p, 75Ω

PB 0.7 Vp-p, 75Ω

PR 0.7 Vp-p, 75Ω

AV 1, 2

Video In 1 Vp-p, 75Ω

Audio In Approx. 0.5V, 47kΩ

Monitor Out

Video Out 1 Vp-p, 75Ω

Audio Out Approx. 0.5V, 1kΩ

High Voltage : 27.5kV ±1.5

at zero beam current

Picture Tube : A51LYZ295X

50.5cm (21 inches)

Measured diagonally,

90° deflection

Audio Output : 16.0W

Dimensions : Height:472mm

Width : 648 mm

Depth : 488 mm

Mass : 23 kg (Net Wt.)

Specifications are subject to change without notice.

Mass and dimensions shown are approximate.

Colour Television

Specifications

ORDER NO. MTV0601483CE

1 Safety Precautions 3

1.1. General Guide Lines 3

1.2. Leakage Current Cold Check 3

1.3. Leakage Current Hot Check (Fig. 1) 3

1.4. X-Radiation 3

1.5. GL1 Chassis Block Diagram 4

2 Service Hints 5

2.1. Service Position for E-Board 5

2.2. Factory Mode Adjustment 5

2.3. Adjustment for White Balance 8

2.4. Adjustment for CRT CUT OFF 8

2.5. Adjustment Procedure 9

2.6. Adjustment 10

3 Conductor Views 13

4 Schematic Diagram 14

4.1. A Board 16

4.2. L Board 21

5 Parts Locations 24

6 Replacement Parts List 25

6.1. Replacement Parts List 26

CONTENTS

Page Page

TC-21FX20RG

1 Safety Precautions

1.1. General Guide Lines

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 29.0kV is present when this receiver 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. After servicing make the following 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.

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 4 MΩand 20 MΩ. When the exposed metal does not have a return path to the chassis,

the reading must be infinite.

1.3. Leakage Current Hot Check (Fig. 1)

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

2. Check a 2 kΩnon-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.

The current from any point should not exceed 0.7 mA peak AC or 2 mA DC. In the case of a measurement being outside of

these limits specified, there is a possibility of a shock hazard and the receiver should be repaired and rechecked before it is

returned to the customer.

Fig. 1

1.4. X-Radiation

Warning:

The potential sources of X-Radiation in TV set are the EHT section and the picture tube. When using a picture tube test jig for

service, ensure that jig is capable of handling 29.0kV 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.

3. Measure the EHT. The meter reading should indicate 27.5±1.5kV. If the meter indication is out of tolerance, immediate service

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

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

necessary.

TC-21FX20RG

1.5. GL1 Chassis Block Diagram

GL1 BLOCK DIAGRAM

Antenna

TUNER

SAW

Rear Inputs

AV 1 : V / L / R

Front Inputs

AV 2 : V / L / R

YUV YUV

CVBS4

CVBS2

V OUT

H OUT

CRT

defl.

coil

MONITOR

OUT

SDA SCL

Audio Out Mon Out

AUDIO

AMP

IC2302

IC601

UOC

EEPROM

IC1103

IC851

5V & 8V

IC801

T801

IC880

3.3V

PRIMARY

LIFE CCT

SPEAKER

TC-21FX20RG

2 Service Hints

2.1. Service Position for E-Board

1. Remove the back cover.

2. Stand the TV set as shown in Fig. 2.

3. Remove the A-Board from the TV set by pulling the main board out as shown in Figure 2.

Fig. 2

2.2. Factory Mode Adjustment

1. Adjustment.

a. Set Timer ON (30 minutes)

Press remote’s RECALL & panel’s vol down key simultaneously to select service mode.

b. CHK should appear on right side of TV screen.

After few seconds CHK 1 should appear on right side of TV screen.

NOTE :

To move from CHK 1 to CHK 2 mode, etc, please follow below rotation:-

c. CHK 1

Press digit key “4” to move option mode forward.

Press digit key “3” to move option backward.

The function rotation will be as follows :-

TC-21FX20RG

d. After selecting the required option mode press Vol up / Vol down to adjust correct option. OSD will change to RED colour.

Press digit “0” to memorize data.

e. CHK2

Press digit key “2” to move forward to CHK2.

The function rotation will be as follows:-

f. Press digit key “4” to move forward from Colour ------> Sub-Colour, etc.

Press digit key “3” to move backward from Sub-Colour ------> Colour, etc.

g. Press volume up / volume down to adjust setting.

h. Press digit key “5” to make the AKB OFF (Blue OSD) - first time.

Press digit key “5” to make the AKB On (White OSD) - second time.

i. CHK3

Press digit key “2” to move forward to CHK 3.

The function rotation will be as follows:-

TC-21FX20RG

j. Press digit key “4” to move forward from V-SLOPE ------> V-SHIFT

Press digit key “3” to move backward from V-SHIFT ------> V-SLOPE

k. Press volume up / volume down to adjust required setting.

l. CHK4

Press digit key “2” to move forward to CHK 4.

The function rotation will be as follows:-

m. Press digit key “4” to move forward from R-CUT ------> G-CUT

Press digit key “3” to move backward from G-CUT ------> R-CUT

n. After selecting the required mode, press volume up / volume down to adjust required setting.

o. Press digit key “5” to make the AKB OFF and H-Line mode - first time.

Press digit key “5” to make the AKB ON and Normal picture - second time.

p. After finish adjustment, press Power ON / OFF button on remote control to go to normal TV mode.

2. HOW TO CHANGE CHANNEL BY I2C BUS CONTROLLER

a. Short FA1 and FA2

b. Select Slave address ‘70H’, Sub-address ‘43H’ for RF AGC.

* Example :

Slave Address = 70H’, Sub-Address = 43H’

Data = 80H’ = Center

TC-21FX20RG

2.3. Adjustment for White Balance

Preparation:

1. Receive the white balance pattern and aging should have been performed over 30 minutes.

2. Set the picture menu to DYNAMIC NORMAL.

3. Degausse the CRT face.

4. Fix the CRT colour analyzer receiver unit to CRT face.

Adjustment of Low Light.

1. Adjustment Sub Bright, so that Y = 6.5 ± 1.0 nit.

2. Adjustment R-CUT OFF, so that X = 0.245 ± 0.015 nit.

3. Adjustment G-CUT OFF, so that Y = 0.274 ± 0.015 nit.

Adjustment of High Light

1. Adjustment Sub Bright, so that Y = 150 nit.

2. Adjustment R-Drive, so that X = 0.261 ± 0.015 nit.

3. Adjustment G-Drive, so that Y = 0.274 ± 0.015 nit.

2.4. Adjustment for CRT CUT OFF

Preparation:

1. Connect the oscilloscope probe to TPL5.

2. Screen VR min.

3. Set the data Sub Bright, Bright.

4. In service Mode at “Bright” dac press [5] in factory mode to enter vertical line and adjust by volume down or up button.

5. Adjust “Screen VR” until 1-H Line appears.

TC-21FX20RG

2.5. Adjustment Procedure

2.5.1. +B Voltage

Item / preparation

1. Operate the TV set.

2. Set control as follows :

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

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

Adjustment procedure

1. Confirm the DC voltage at the indicated test points, as follows :

TPA 10 : 141 ± 1.5V

TPA 12 : 3.3 ± 0.5V

TPA 09 : 5 ± 1V

2.5.2. High Voltage

Item / preparation

1. Receive the crosshatch pattern.

2. Set to 0 Beam.

Screen VR .......... minimum

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

Adjustment procedure

1. Connect a DC voltage meter to TPA 10 and confirm the +B voltage is 141.0 ± 1.5V.

2. Connect a high frequency voltmeter to heater and confirm that voltage reads 6.3 ± 0.24 (VRMS).

3. Normalize the brightness and contrast.

TC-21FX20RG

Colour Purity

1. Set the Brightness and Contrast controls to their maximum

positions.

2. Operate the TV set for 60 minutes.

3. Fully degausse 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 control as follows:

Red................minimum

Green.............minimum

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

Press the Shipping button on the remote control twice to

select CRT Adjustment Mode to select low light.

7. Loosen the clamp screw for the Deflection Yoke A in Fig. 10

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.

Fig. 6

9. Slowly push the Deflection Yoke and set it where a uniform

green field is obtained.

Fig. 21

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. 10.

Convergence

1. Apply a crosshatch pattern signal and Normalize Contrast

control to the maximum positions.

2. Adjust Brightness until the grey position 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.

Fig. 8

4. Adjust Red and Blue with 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. 9

7. Fix the Deflection Yoke by reinserting the DY wedges. Refer

to Fig. 10.

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

2.6. Adjustment

Before Colour Purity, Convergence and White Balance adjustment are attempted,

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

TC-21FX20RG

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