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Panasonic TX-21FG50A Service Manual
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Panasonic TX-21FG50A Service Manual

Panasonic TX-21FG50A Service Manual

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Specifications
Power Source :
Power Consumption :
Aerial Impedance :
Receiving System :
Receiving Channels :
VHF
UHF
CATV
Intermediate Frequency :
Video
Sound
AC AUTO 110-240V, 50/60 Hz
75Ω unbalanced
Coaxial type
17 Systems
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.
21-69 PAL G I/SECAM B, G, K1
28-69 PAL G (Australia)
13-56 PAL D
13-52 NTSC M JAPAN
14-69 NTSC NTSC M U.S.A.
S1-S41 (Hyper)
38.0 MHz
31.5 MHz (D, K, K1)
32 MHz (I)
32.5 MHz (B, G)
33.5 MHz (M)
TX-21FG50A-
AUSTRALIA
GP31 Chassis
Colour
83W
Video / Terminals :
RAV In
Monitor Out
High Voltage :
Picture Tube :
Audio Output :
Dimensions :
Mass :
Specifications are subject to change without notice.
Mass and dimensions shown are approximate.
ORDER NO. MTV0501369C3
Colour Television
33.75 MHz (SECAM)
Audio In Approx. 400mVrms
Video Out 1 Vp-p 75Ω
Audio Out Approx. 400mVrms
at zero beam current
Measured diagonally,
© 2005 Matsushita Electric Industrial Co., Ltd. All
rights
reserved.
Unauthorized
distribution is a violation of law.
33.57 MHz (PAL)
33.6 MHz (SECAM)
34.42 MHz (NTSC)
AV1, 2
Video In 1 Vp-p 75Ω
27.5kV±1.5
A51LXR195X
51cm (21 inches)
90° deflection
16.0W
Height : 473 mm
Width : 648 mm
Depth : 488 mm
24 kg (Net Wt.)
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Summary of Contents for Panasonic TX-21FG50A

  • Page 1 ORDER NO. MTV0501369C3 Colour Television TX-21FG50A- AUSTRALIA GP31 Chassis Specifications Power Source : AC AUTO 110-240V, 50/60 Hz Colour 33.57 MHz (PAL) Power Consumption : 33.6 MHz (SECAM) Aerial Impedance : 75Ω unbalanced 33.75 MHz (SECAM) Coaxial type 34.42 MHz (NTSC)

  • Page 2: Table Of Contents

    TX-21FG50A-AUSTRALIA CONTENTS Page Page 1 Safety Precautions 2.5. Adjustment Procedure 1.1. General Guide Lines 2.6. PAL Colour 1.2. Leakage Current Cold Check 2.7. Adjustment 1.3. Leakage Current Hot Check (Fig. 1) 3 Conductor Views 1.4. X-Radiation 4 Schematic Diagram 1.5. GP31 Chassis Block Diagram 4.1.

  • Page 3: Safety Precautions

    TX-21FG50A-AUSTRALIA 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.

  • Page 4: Gp31 Chassis Block Diagram

    TX-21FG50A-AUSTRALIA 1.5. GP31 Chassis Block Diagram...

  • Page 5: Service Hints

    TX-21FG50A-AUSTRALIA 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.

  • Page 6: Adjustment For White Balance

    TX-21FG50A-AUSTRALIA 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 7: Adjustment Procedure

    TX-21FG50A-AUSTRALIA 2.5. Adjustment Procedure 2.5.1. +B Voltage 2.5.3. High Voltage Item / preparation Item / preparation 1. Operate the TV set. 1. Receive the crosshatch pattern. 2. Set control as follows : 2. Set to 0 Beam. Brightness ... minimum Screen VR ..

  • Page 8: Pal Colour

    TX-21FG50A-AUSTRALIA 2.6. PAL Colour 1. Receive the PAL B/G studio colour bar pattern and adjust local frequency at the best tuned position. 2. Pic Menu: Dynamic Normal, Confirm Contrast - 100 DAC, Sub Contrast - 21 dac. 3. Channel colour set --------- STD 4.
  • Page 9 TX-21FG50A-AUSTRALIA Before Colour Purity, Convergence and White Balance adjustment are attempted, V. Height, H. Centre and Focus adjustments must be completed. Colour Purity Convergence 1. Set the Brightness and Contrast controls to their maximum 1. Apply a crosshatch pattern signal and Normalize Contrast positions.
  • Page 10 TX-21FG50A-AUSTRALIA Adjustment of CRT VRS 1. Preparation a. Set DY to CRT not to tilt up and down left and right deflection. b. Set CY to CRT and set CY magnet primarily (Fig. 1) Purity magnet : Set purity magnet that 2 magnets are (TOP POSITION) VRS magnet : Set purity magnet 2 magnets are (HORIZONTAL POSITION) 2.
  • Page 11 TX-21FG50A-AUSTRALIA Fig. 10 Fig. 11 Notes: 1. Wedge A, B and C should be inserted following the sequence of 1, 2 and 3 shown in Fig. 11. 2. The wedges should be set 120° apart from each other. 3. Be certain that three wedges are firmly fixed and the Deflection Yoke is tightly clamped in place.

  • Page 12: Conductor Views

    TX-21FG50A-AUSTRALIA 3 Conductor Views...

  • Page 13: Schematic Diagram

    TX-21FG50A-AUSTRALIA 4 Schematic Diagram...
  • Page 14 TX-21FG50A-AUSTRALIA...

  • Page 15: A Board

    TX-21FG50A-AUSTRALIA 4.1. A Board 4.1.1. A Board (1/5) <1A> <2A> <3A> <4A> <5A> <6A>...
  • Page 16 TX-21FG50A-AUSTRALIA 4.1.2. A Board (2/5) <1A> <1B> <2A> <2B> <3A> <3B> <4A> <4B> <5B> <5A> <6A> <6B>...
  • Page 17 TX-21FG50A-AUSTRALIA 4.1.3. A Board (3/5) <1B> <1C> <2C> <2B> <3C> <3B> <4C> <4B> <5B> <5C> <6B> <6C>...
  • Page 18 TX-21FG50A-AUSTRALIA 4.1.4. A Board (4/5) <1C> <1D> <2D> <2C> <3D> <3C> <4D> <4C> <5D> <6D> <5C> <6C>...
  • Page 19 TX-21FG50A-AUSTRALIA 4.1.5. A Board (5/5) <1D> <2D> <3D> <4D> <5D> <6D>...

  • Page 20: L Board

    TX-21FG50A-AUSTRALIA 4.2. L Board 4.2.1. L Board (1/3) <A1> <A2> <A3> <A4> <A5>...
  • Page 21 TX-21FG50A-AUSTRALIA 4.2.2. L Board (2/3) <A1> <B1> <A2> <B2> <A3> <B3> <B4> <B5> <A4> <A5> <B6>...
  • Page 22 TX-21FG50A-AUSTRALIA 4.2.3. L Board (3/3) <B1> <B2> <B3> <B4> <B5> <B6>...

  • Page 23: Parts Locations

    TX-21FG50A-AUSTRALIA 5 Parts Locations...

  • Page 24: Replacement Parts List

    TX-21FG50A-AUSTRALIA 6 Replacement Parts List...

  • Page 25: Replacement Parts List

    TX-21FG50A-AUSTRALIA 6.1. Replacement Parts List Ref. Part No. Part Name & Description Remarks C2114 ECJ2VF1H104Z C 0.1UF, Z, 50V Ref. Part No. Part Name & Description Remarks C2115 ECA1HM4R7B E 4.7UF, 50V C2117 ECA1CM101B E 100UF, 16V A51LXR195X PICTURE TUBE...
  • Page 26 TX-21FG50A-AUSTRALIA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C566 ECQM4103RJZ P 0.01UF, J, 400V C881 ECA1CM101B E 100UF, 16V C567 ECQM4393JZ P 0.039UF, J,400V C882 ECJ2VF1H104Z C 0.1UF, Z, 50V C568 ECWH16332JVB P 3300PF,J,1.6KV...
  • Page 27 TX-21FG50A-AUSTRALIA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks IC2301 AN17820B Q857 B1BAAN000029 TRANSISTOR IC351 TDA6107JF/N3 Q870 B1ABCE000015 TRANSISTOR IC451 AN15525A Q871 B1ABCE000015 TRANSISTOR IC601 TDA9594N96DC RESISTORS IC801 C5HABZZ00116 IC, POWER SUPPLY...
  • Page 28 TX-21FG50A-AUSTRALIA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R145 D0GD473JA017 F 47KOHM,J, 1/10W R414 D0GD432JA017 F 4.3KOHM,J, 1/10W R150 D0GD222JA017 F 2.2KOHM,J, 1/10W R415 ER0S2CHF7500 M 750OHM,J, 1/4W R151 D0GD333JA017 F 33KOHM,J, 1/10W...
  • Page 29 TX-21FG50A-AUSTRALIA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R840 ERD75TAJ825 C 8.2MOHM,J, 3/4W SW1006 EVQ11G05R SWITCH R841 D0GD472JA017 F 4.7KOHM,J, 1/10W SW801 ESB92DA1B SWITCH R842 D0GD472JA017 F 4.7KOHM,J, 1/10W TU001 ENV59K01G3RF...

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