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Panasonic TC-21GX20P Service Manual
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Panasonic TC-21GX20P Service Manual

Gl1 chassis
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Specifications
Power Source :
Power Consumption :
Aerial Impedance :
Receiving System :
Receiving Channels :
VHF
UHF
CATV
Audio Terminal :
DVD
Y
PB
PR
AV 1, 2
Video In
1 Vp-p, 75Ω
Audio In
Approx. 0.5V, 47kΩ
Monitor Out
AC AUTO 110-240V, 50/60 Hz
58W
75Ω unbalanced
Coaxial type
17 Systems
2-13(U.S.A Standard)
14-69(U.S.A Standard)
1-125(U.S.A Standard)
1.0 Vp-p, 75Ω
0.7 Vp-p, 75Ω
0.7 Vp-p, 75Ω
TC-21GX20P
GL1 Chassis
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.
© 2007 Matsushita Electric Industrial Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. MTV0701518CE
Colour Television
1 Vp-p, 75Ω
Approx. 0.5V, 1kΩ
27.5kV ±1.5
at zero beam current
A51LYZ395X65
50.5cm (21 inches)
Measured diagonally,
90° deflection
5W + 5w = 10W
Height : 472 mm
Width : 598 mm
Depth : 479 mm
22.5 kg (Net Wt.)
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Summary of Contents for Panasonic TC-21GX20P

  • Page 1 ORDER NO. MTV0701518CE Colour Television TC-21GX20P GL1 Chassis Specifications Power Source : AC AUTO 110-240V, 50/60 Hz Video Out 1 Vp-p, 75Ω Power Consumption : Audio Out Approx. 0.5V, 1kΩ Aerial Impedance : 75Ω unbalanced High Voltage : 27.5kV ±1.5...

  • Page 2: Table Of Contents

    TC-21GX20P CONTENTS Page Page 1 Safety Precautions 2.4. Adjustment for CRT CUT OFF 1.1. General Guide Lines 2.5. Adjustment Procedure 1.2. Leakage Current Cold Check 2.6. Adjustment 1.3. Leakage Current Hot Check (Fig. 1) 3 Conductor Views 1.4. X-Radiation 4 Schematic Diagram 1.5.

  • Page 3: Safety Precautions

    TC-21GX20P 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: Gl1 Chassis Block Diagram

    TC-21GX20P 1.5. GL1 Chassis Block Diagram...

  • Page 5: Service Hints

    TC-21GX20P 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 TC-21GX20P 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.
  • Page 7 TC-21GX20P 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.

  • Page 8: Adjustment For White Balance

    TC-21GX20P 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 9: Adjustment Procedure

    TC-21GX20P 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 ±...

  • Page 10: Adjustment

    TC-21GX20P 2.6. Adjustment 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 11 TC-21GX20P 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 12 TC-21GX20P 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 13: Conductor Views

    TC-21GX20P 3 Conductor Views...

  • Page 14: Schematic Diagram

    TC-21GX20P 4 Schematic Diagram...
  • Page 15 TC-21GX20P...

  • Page 16: A Board

    TC-21GX20P 4.1. A Board 4.1.1. A Board (1/5) <1A> <2A> <3A> <4A> <5A> <6A> <7A> <8A> <9A>...
  • Page 17 TC-21GX20P 4.1.2. A Board (2/5) <1A> <1B> <2A> <2B> <3B> <4B> <3A> <4A> <5B> <6B> <5A> <7B> <6A> <8B> <7A> <8A> <9A> <9B>...
  • Page 18 TC-21GX20P 4.1.3. A Board (3/5) <1B> <1C> <2C> <2B> <3B> <3C> <4B> <4C> <5C> <5B> <6B> <6C> <7B> <7C> <8B> <8C> <9B> <9C>...
  • Page 19 TC-21GX20P 4.1.4. A Board (4/5) <1C> <1D> <2C> <2D> <3C> <3D> <4D> <5D> <4C> <6D> <7D> <5C> <6C> <7C> <8D> <8C> <9D> <9C>...
  • Page 20 TC-21GX20P 4.1.5. A Board (5/5) <1D> <2D> <3D> <4D> <5D> <6D> <7D> <8D> <9D>...

  • Page 21: L Board

    TC-21GX20P 4.2. L Board 4.2.1. L Board (1/3) <1A> <2A> <3A> <4A> <5A>...
  • Page 22 TC-21GX20P 4.2.2. L Board (2/3) <1A> <1B> <2A> <3A> <4A> <2B> <3B> <4B> <5B> <5A> <6B>...
  • Page 23 TC-21GX20P 4.2.3. L Board (3/3) <1B> <2B> <3B> <4B> <5B> <6B>...

  • Page 24: Parts Locations

    TC-21GX20P 5 Parts Locations...

  • Page 25: Replacement Parts List

    TC-21GX20P 6 Replacement Parts List...

  • Page 26: Replacement Parts List

    TC-21GX20P 6.1. Replacement Parts List Ref. Part No. Part Name & Description Remarks C515 F1B2H331A025 C 330PF, 500V Ref. Part No. Part Name & Description Remarks C516 F2A1E102A199 E 1000UF, 25V C519 F2A2C330A096 E 33UF, 160V A51LYZ395X65 C520 F2A0J221A317 E 220UF, 6.3V...
  • Page 27 TC-21GX20P Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C860 F1B2H331A025 C 300PF, 50V IC880 C0DAEJG00001 IC, POWER SUPPLY C862 F2A1C122A256 E 1200UF, 16V COILS C863 F2A2C2210013 E 220UF, 160V L001 G0C100K00008...
  • Page 28 TC-21GX20P Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R3010 ERJ3GEYJ184 M 180KOHM,J,1/16W R564 ERDS2TJ393 C 39KOHM,J, 1/4W R3012 ERJ3GEYJ184 M 180KOHM,J,1/16W R580 ERJ3GEYJ392 M 3.9KOHM,J,1/16W R3013 ERJ3GEYJ184 M 180KOHM,J,1/16W R581 ERJ3GEYJ472 M 4.7KOHM,J,1/16W...
  • Page 29 TC-21GX20P Ref. Part No. Part Name & Description Remarks ERJ3GEY0R00 M 0OHM,J,1/16W ERJ3GEY0R00 M 0OHM,J,1/16W ERJ3GEY0R00 M 0OHM,J,1/16W ERJ3GEY0R00 M 0OHM,J,1/16W ERJ3GEY0R00 M 0OHM,J,1/16W ERJ3GEY0R00 M 0OHM,J,1/16W JK3002 K4BK09B00013 REAR AV TERMINAL JK3003 K4BK10B00004 REAR AV TERMINAL JK3202 K4BC14B00005 FRONT AV TERMINAL...

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