Panasonic TX-21RX25R Service Manual
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Panasonic TX-21RX25R 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-21RX25R
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. MTV0801590CE
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 kΩ
1 Vp-p 75 Ω
Approx. 0.5 V, 1 kΩ
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-21RX25R

  • Page 1 ORDER NO. MTV0801590CE Colour Television TX-21RX25R GP41Z Chassis Specifications Power Source : AC SINGLE 220-240 V, 50/60 Hz Video / Audio Terminal : Power Consumption : 86 W 75 Ω unbalanced 1.0 Vp-p 75 Ω Aerial Impedance : 0.7 Vp-p 75 Ω...

  • Page 2: Table Of Contents

    TX-21RX25R CONTENTS Page Page 1 Safety Precautions 4 Conductor Views 1.1. General Guidelines 5 Schematic Diagram 1.2. Leakage Current Cold Check 5.1. A Board 1.3. Leakage Current Hot Check (Fig. 1) 5.2. L Board 1.4. X-Radiation 5.3. V Board 1.5. SW-Board Fix to Cabinet 5.4.

  • Page 3: Safety Precautions

    TX-21RX25R 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-21RX25R 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-21RX25R 1.6. GP41Z Chassis Block Diagram...

  • Page 6: Service Hints

    TX-21RX25R 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-21RX25R 2.3. Adjustment for White Balance Preparation: 1. Receive the white balance pattern and aging should be 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-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R (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-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R 3 Location of Lead Wiring 3.1. Wire Dressing...

  • Page 21: Wire Dressing And Connections

    TX-21RX25R 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-21RX25R 4 Conductor Views...

  • Page 23: Schematic Diagram

    TX-21RX25R 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-21RX25R 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-21RX25R 5.1. A Board 5.1.1. A Board (1/5) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A>...
  • Page 26 TX-21RX25R 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-21RX25R 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-21RX25R 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-21RX25R 5.1.5. A Board (5/5) <1D> <2D> <3D> <4D> <5D> <6D> <7D> <8D> <9D>...

  • Page 30: L Board

    TX-21RX25R 5.2. L Board 5.2.1. L Board (1/3) <1A> <2A> <3A> <4A> <5A>...
  • Page 31 TX-21RX25R 5.2.2. L Board (2/3) <1A> <1B> <2A> <3A> <2B> <3B> <4A> <5A> <4B>...
  • Page 32 TX-21RX25R 5.2.3. L Board (3/3) <1B> <2B> <3B> <4B>...

  • Page 33: Board

    TX-21RX25R 5.3. V Board 5.3.1. V Board (1/2) <1A> <2A> <3A> <4A>...
  • Page 34 TX-21RX25R 5.3.2. V Board (2/2) <1A> <2A> <3A> <4A>...

  • Page 35: Pp Board

    TX-21RX25R 5.4. PP Board 5.4.1. PP Board (1/2) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A>...
  • Page 36 TX-21RX25R 5.4.2. PP Board (2/2) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A>...

  • Page 37: G Board

    TX-21RX25R 5.5. G Board 5.5.1. G Board (1/2) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A> <9A>...
  • Page 38 TX-21RX25R 5.5.2. G Board (2/2) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A> <9A>...

  • Page 39: K Board

    TX-21RX25R 5.6. K Board 5.6.1. K Board...

  • Page 40: P Board

    TX-21RX25R 5.7. P Board 5.7.1. P Board...

  • Page 41: Sw Board

    TX-21RX25R 5.8. SW Board 5.8.1. SW Board (1/2) <1A> <2A> <3A>...
  • Page 42 TX-21RX25R 5.8.2. SW Board (2/2) <1A> <2A> <3A>...

  • Page 43: Parts Locations

    TX-21RX25R 6 Parts Locations 6.1. Packing Exploded View - A...

  • Page 44: Packing Exploded View - B

    TX-21RX25R 6.2. Packing Exploded View - B...

  • Page 45: Parts Locations

    TX-21RX25R 6.3. Parts Locations...

  • Page 46: Replacement Parts List

    TX-21RX25R 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 47: Replacement Parts List

    TX-21RX25R 7.1. Replacement Parts List Ref. Part No. Part Name & Description Remarks C2322 F1J1H102A018 E 1000UF, 50V Ref. Part No. Part Name & Description Remarks C2325 F2A1C470A310 E 47UF, 16V C2326 F2A1C470A310 E 47UF, 16V A51QGV991X31 ITC CRT C253...
  • Page 48 TX-21RX25R Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C605 ECJ2VB1C104K C 0.1UF, K, 16V C875 F1J1H332A021 C 3300PF, 50V C606 ECJ1VF1H104Z C 0.1UF, Z, 50V C877 F2A1C1000079 C 3300PF, 50V C607 F1H1H103A975 C 0.01UF,Z, 50V...
  • Page 49 TX-21RX25R Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks D873 B0AACJ000009 DIODE L842 J0JKA0000025 BEAD CORE D876 B0AACJ000009 DIODE L845 J0JKA0000023 BEAD CORE D881 B0BA01500052 DIODE L865 J0JKA0000025 BEAD CORE D882 B0BA01500052...
  • Page 50 TX-21RX25R Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R1822 ERJ3GEYJ101 M 100OHM,J,1/16W R501 ERJ3GEYJ273 M 27KOHM,J,1/16W R1831 ERJ3GEYJ101 M 100OHM,J,1/16W R502 ERJ3GEYJ103 M 10KOHM,J,1/16W R1832 ERJ3GEYJ101 M 100OHM,J,1/16W R504 ERG2SJS332H M 10KOHM,J,1/10W...
  • Page 51 TX-21RX25R Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R713 ERG3FJ100H M 10OHM,J, 3W JA33 ERJ6GEY0R00 M 0OHM,J,1/10W R715 ERDS2TJ472 C 4.7KOHM,J, 1/4W JA35 ERJ6GEY0R00 M 0OHM,J,1/10W R824 ERX12SJR27E M 0.27OHM,J, 1/2W...

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