Panasonic TX-21RX20M-MALAYSIA Service Manual
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Panasonic TX-21RX20M-MALAYSIA Service Manual

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Specifications
Power Source :
Power Consumption :
Aerial Impedance :
Receiving System :
Receiving Channels :
VHF
UHF
CATV
AC SINGLE 220-240 V, 50/60 Hz
75 Ω unbalanced
Coaxial type
17 Systems
2-12 PAL / SECAM B, K1
0-12 PAL B (AUST)
1-9 PAL B (N. ZEALAND)
1-12 PAL / SECAM D
1-12 NTSC M (JAPAN)
2-13 NTSC M (U.S.A.)
21-69 PAL G, H, I / SECAM G, K, K1
28-69 PAL B (AUST)
13-57 PAL D, K
13-62 NTSC M (JAPAN)
14-69 NTSC M (U.S.A.)
S1-S20 (OSCAR)
1-125 (U.S.A. CATV)
C13-C49 (JAPAN)
S21-S41 (HYPER)
Z1-Z37 (CHINA)
5A, 9A (AUST)
TX-21RX20M-
MALAYSIA
GP41Z Chassis
Video / Audio Terminal :
86 W
DVD
P
P
AV 1, 2, 3
Video In
Audio In
Monitor Out
Video Out
Audio Out
High Voltage :
Picture Tube :
Audio Output :
Dimensions :
Mass :
Specifications are subject to change without notice.
Mass and dimensions shown are approximate.
© 2008 Matsushita Electric Industrial Co., Ltd. All
rights
distribution is a violation of law.
ORDER NO. MTV0701584CE
Colour Television
Y
B
R
reserved.
Unauthorized
1.0 Vp-p 75 Ω
0.7 Vp-p 75 Ω
0.7 Vp-p 75 Ω
1 Vp-p 75 Ω
Approx. 0.5 V, 47 k Ω
1 Vp-p 75 Ω
Approx. 0.5 V, 1 k Ω
24.0 kV ± 1.5
at zero beam current
A51QGA993X01
51.0 cm (21 inches)
Measured diagonally,
90° deflection
20.0 W
Height : 431 mm
Width : 596 mm
Depth : 340 mm
20.5 kg (Net)
copying
and

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Summary of Contents for Panasonic TX-21RX20M-MALAYSIA

  • Page 1 ORDER NO. MTV0701584CE Colour Television TX-21RX20M- MALAYSIA GP41Z Chassis Specifications Power Source : AC SINGLE 220-240 V, 50/60 Hz Video / Audio Terminal : Power Consumption : 86 W Aerial Impedance : 75 Ω unbalanced 1.0 Vp-p 75 Ω 0.7 Vp-p 75 Ω Coaxial type Receiving System : 17 Systems...

  • Page 2: Table Of Contents

    TX-21RX20M-MALAYSIA CONTENTS Page Page 1 Safety Precautions 3.2. Wire Dressing and Connections 1.1. General Guidelines 4 Conductor Views 1.2. Leakage Current Cold Check 5 Schematic Diagram 1.3. Leakage Current Hot Check (Fig. 1) 5.1. A Board 1.4. X-Radiation 5.2. L Board 1.5.

  • Page 3: Safety Precautions

    TX-21RX20M-MALAYSIA 1 Safety Precautions 1.1. General Guidelines 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.

  • Page 4: X-Radiation

    TX-21RX20M-MALAYSIA 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 the jig is capable of handling 25.5 kV without causing X-Radiation.

  • Page 5: Gp41Z Chassis Block Diagram

    TX-21RX20M-MALAYSIA 1.6. GP41Z Chassis Block Diagram...

  • Page 6: Service Hints

    TX-21RX20M-MALAYSIA 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 Fig. 2.

  • Page 7: Adjustment For White Balance

    TX-21RX20M-MALAYSIA 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.

  • Page 8: Adjustment Of Purity

    TX-21RX20M-MALAYSIA 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 16 and confirm the +B voltage is 130.0 V ± 2.
  • Page 9 TX-21RX20M-MALAYSIA ADJUSTMENT OF CONVERGENCE 1. INSTRUMENT a. Helmhortz device 2. PREPARATION a. Set the Helmhortz device to local magnetic field. Horizontal : 0 ± 0.03 × 10-4T b. Receive the crosshatch pattern. c. Picture menu : DYNAMIC Normal and adjust BRIGHT DAC until gray portion of crosshatch.
  • Page 10 TX-21RX20M-MALAYSIA ADJUSTMENT OF CRT VRS 1. PREPARATION a. Set DY to CRT not to tilt up and down left and right deflection. (Fig. 1) b. Set CY to CRT and set CY magnet primarily. Pur Mg : Set Pur Mg that 2 magnets are horizontal position.
  • Page 11 TX-21RX20M-MALAYSIA TERRESTRIAL MAGNETISM CIRCUIT CONFIRMATION 1. CONFIRMATION OF GEOMAGNETIC CIRCUIT a. Select GEOMAGNETIC mode in PRESET MENU. b. Confirm that it leans right side as shown (Fig. 1), when change the DAC (*). c. Confirm that it leans left side as shown (Fig. 1), when change the DAC (**).
  • Page 12 TX-21RX20M-MALAYSIA FOCUS ADJUSTMENT 1. PREPARATION a. Receive crosshatch pattern E-4 b. Picture menu : DYNAMIC NORMAL 2. ADJUSTMENT a. Adjust focus VR for best position. Adjust focus base on no. 6 line Fig. 1. Crosshatch Pattern...
  • Page 13 TX-21RX20M-MALAYSIA DEFLECTION Note:- For Philippines model, all 50 Hz adjustment is made in AV mode. A . DEFLECTION ADJUSTMENT / CONFIRMATION (50 Hz, 4:3 Mode ONLY) (Service 1) 1. INSTRUMENT a. Helmhortz device 2. PREPARATION a. Set the Helmhortz device to local magnetic field.
  • Page 14 TX-21RX20M-MALAYSIA B . DEFLECTION ADJUSTMENT / CONFIRMATION (50 Hz, 4:3 Mode ONLY) (Service 1) 1. INSTRUMENT a. Helmhortz device 2. PREPARATION a. Set the Helmhortz device to local magnetic field. b. Picture menu : DYNAMIC Normal 3. CONFIRMATION AND ADJUSTMENT a.
  • Page 15 TX-21RX20M-MALAYSIA 4. ADJUSTMENT OF 50 Hz H-AMP a. Receive the monoscope pattern (E11). b. Adjust H-AMP so that both edges are within 2.5 ± 0.2. Refer to Fig. 1. Fig. 1 5. EW ADJUSTMENT / CONFIRMATION a. PREPARATION a. Receive crosshatch pattern (E4).
  • Page 16 TX-21RX20M-MALAYSIA (16:9 MODE) ADJUSTMENT / CONFIRMATION 1. V-ZOOM (16:9) ADJUSTMENT (Service 3) *a. Receive PAL monoscope pattern E11. (If no burst signal : Set to force PAL) b. Set the aspect to 16:9. c. Confirm that A, B in Fig. 1 is 4.0 cm ± 1.5, if not, adjust V-ZOOM.
  • Page 17 TX-21RX20M-MALAYSIA 1. Confirmation of deflection setting, if not in spec, touch up as below :- (Service 3) A) For 60 Hz (4:3 only) : a. Adjustment of 60 Hz V-CENTER a. Receive the monoscope pattern (US13). b. Adjust V-POS 60 Hz offset so that centre of monoscope pattern is at CRT centre.
  • Page 18 TX-21RX20M-MALAYSIA B) For other Deflection touch up 50 & 60 Hz ; 4:3 & 16:9 1. Adjustment of V-Sym a. Adjust V-SYM so that a=b in Fig. 1 Fig. 1 2. Adjustment of V-LIN a. Adjust V-LIN a=b=c=d in Fig. 2.
  • Page 19 TX-21RX20M-MALAYSIA 6. Adjustment of BOW a. Adjust BOW so that the vertical lines are straight. (Fig. 6) Fig. 6...

  • Page 20: Location Of Lead Wiring

    TX-21RX20M-MALAYSIA 3 Location of Lead Wiring 3.1. Wire Dressing...

  • Page 21: Wire Dressing And Connections

    TX-21RX20M-MALAYSIA 3.2. Wire Dressing and Connections < CONNECTIONS > LEAD \ CLAMPER A18 ~ G18 DEG COIL SPEAKER (R) SPEAKER (L) A13 ~ G13) A1 ~ V1 AC CORD A5 ~ L3 FOCUS & SCREEN A27 ~ SW5 A25 ~ SW15...

  • Page 22: Conductor Views

    TX-21RX20M-MALAYSIA 4 Conductor Views...

  • Page 23: Schematic Diagram

    TX-21RX20M-MALAYSIA 5 Schematic Diagram Notes : 1. Resistor All resistors are carbon 1/4 W resistors unless marked as follows : Unit of resistance is OHM (Ω) (K = 1 000 M = 1 000 000) 2. Capacitor All capacitors are ceramic 50 V capacitors unless marked as follows : Unit of capacitance is µF unless otherwise noted.
  • Page 24 TX-21RX20M-MALAYSIA 8. When an arrow mark ( ) is found, connection is easily found from the direction of the arrow. : Indicates the major signal flow. 10. This schematic diagram is the latest at the time of printing and subject to change without notice.

  • Page 25: A Board

    TX-21RX20M-MALAYSIA 5.1. A Board 5.1.1. A Board (1/5) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A>...
  • Page 26 TX-21RX20M-MALAYSIA 5.1.2. A Board (2/5) <1A> <1B> <2A> <2B> <3A> <4A> <5A> <6A> <7A> <3B> <4B> <5B> <6B> <8A> <7B>...
  • Page 27 TX-21RX20M-MALAYSIA 5.1.3. A Board (3/5) <1B> <1C> <2B> <2C> <3C> <4C> <3B> <5C> <4B> <6C> <5B> <7C> <6B> <7B> <8C>...
  • Page 28 TX-21RX20M-MALAYSIA 5.1.4. A Board (4/5) <1C> <1D> <2C> <2D> <3D> <4D> <3C> <4C> <5D> <6D> <5C> <6C> <7D> <7C> <8D> <8C> <9D>...
  • Page 29 TX-21RX20M-MALAYSIA 5.1.5. A Board (5/5) <1D> <2D> <3D> <4D> <5D> <6D> <7D> <8D> <9D>...

  • Page 30: L Board

    TX-21RX20M-MALAYSIA 5.2. L Board 5.2.1. L Board (1/3) <1A> <2A> <3A> <4A> <5A>...
  • Page 31 TX-21RX20M-MALAYSIA 5.2.2. L Board (2/3) <1A> <1B> <2A> <3A> <2B> <3B> <4A> <5A> <4B>...
  • Page 32 TX-21RX20M-MALAYSIA 5.2.3. L Board (3/3) <1B> <2B> <3B> <4B>...

  • Page 33: Board

    TX-21RX20M-MALAYSIA 5.3. V Board 5.3.1. V Board (1/2) <1A> <2A> <3A> <4A>...
  • Page 34 TX-21RX20M-MALAYSIA 5.3.2. V Board (2/2) <1A> <2A> <3A> <4A>...

  • Page 35: G Board

    TX-21RX20M-MALAYSIA 5.4. G Board 5.4.1. G Board (1/2) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A> <9A>...
  • Page 36 TX-21RX20M-MALAYSIA 5.4.2. G Board (2/2) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A> <9A>...

  • Page 37: K Board

    TX-21RX20M-MALAYSIA 5.5. K Board 5.5.1. K Board...

  • Page 38: Sw Board

    TX-21RX20M-MALAYSIA 5.6. SW Board 5.6.1. SW Board (1/2) <1A> <2A> <3A>...
  • Page 39 TX-21RX20M-MALAYSIA 5.6.2. SW Board (2/2) <1A> <2A> <3A>...

  • Page 40: Parts Locations

    TX-21RX20M-MALAYSIA 6 Parts Locations 6.1. Packing Exploded View - A...

  • Page 41: Packing Exploded View - B

    TX-21RX20M-MALAYSIA 6.2. Packing Exploded View - B...

  • Page 42: Parts Locations

    TX-21RX20M-MALAYSIA 6.3. Parts Locations...

  • Page 43: Replacement Parts List

    TX-21RX20M-MALAYSIA 7 Replacement Parts List Note : Printed circuit board assembly with “NLA” is no longer available after production discontinuation of the complete set. Abbreviation of part name and description 1. Resistor 2. Capacitor Example : Example : ERD25TJ104 C 100 kΩ, J, 1/4 W ECKF1H103ZF C 0.01 µF, Z, 50 V...

  • Page 44: Replacement Parts List

    TX-21RX20M-MALAYSIA 7.1. Replacement Parts List Ref. Part No. Part Name & Description Remarks C3166 ECJ1VF1C105Z C 1UF, Z, 16V Ref. Part No. Part Name & Description Remarks C3169 ECJ1VF1C105Z C 1UF, Z, 16V C356 F1H1H102A971 C 1000PF,J, 50V A51QGV991X32 ITC CRT...
  • Page 45 TX-21RX20M-MALAYSIA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C657 ECJ1VC1H560J C 56PF, J, 50V D512 B0HAJL000003 DIODE C662 F2A0J101A317 E 100UF, 6.3V D513 B0HAMP000090 DIODE C704 F1B2H471A025 C 470PF, 500V D515...
  • Page 46 TX-21RX20M-MALAYSIA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks L557 ELH5L7159 LINEARITY COIL R1109 ERJ3GEYJ103 M 10KOHM,J,1/16W L565 EXCELSA39V BEAD CORE R1112 ERJ3GEYJ102 M 1KOHM,J,1/16W L566 ELC16B471L CHOKE COIL R1114 ERJ3GEYJ151 M 150OHM,J,1/16W...
  • Page 47 TX-21RX20M-MALAYSIA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R416 ERX2SJR56E M 0.56OHM,J, 2W R705 D0GB203JA008 F 20KOHM,J, 1W R451 ERJ3GEYJ223 M 22KOHM,J,1/16W R713 ERG3FJ100H M 10OHM,J, 3W R453 ERJ3GEYJ101 M 100OHM,J,1/16W...
  • Page 48 TX-21RX20M-MALAYSIA Ref. Part No. Part Name & Description Remarks JA33 ERJ6GEY0R00 M 0OHM,J,1/10W JA35 ERJ6GEY0R00 M 0OHM,J,1/10W JA36 ERJ6GEY0R00 M 0OHM,J,1/10W ERJ6GEY0R00 M 0OHM,J,1/10W JA45 ERJ6GEY0R00 M 0OHM,J,1/10W ERJ6GEY0R00 M 0OHM,J,1/10W ERJ6GEY0R00 M 0OHM,J,1/10W ERJ6GEY0R00 M 0OHM,J,1/10W ERJ6GEY0R00 M 0OHM,J,1/10W...

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