Panasonic TX-28LD4DP Service Manual

Panasonic TX-28LD4DP Service Manual

Euro4 chassis
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SPECIFICATIONS
(Information in brackets { } refers to model TX-25LD4DP)
Power Source:
Power Consumption:
Aerial Impedance:
Stand-by Power
Consumption:
Receiving System:
Receiving Channels:
Intermediate Frequency:
Video
Audio
Colour
Video/Audio
Terminals:
AV1 IN
AV1 OUT
AV2 IN
AV2 OUT
AV3 IN
3DQDVRQLF
220-240V AC, 50Hz
116W
75Ω unbalanced, Coaxial Type
1,8W
PAL I, PAL 525/60
M.NTSC
NTSC (AV only)
UHF E21 - E69
39,5MHz
33,5MHz, 32,95MHz
35,07MHz (PAL)
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 10kΩ
RGB (21 pin)
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 1kΩ
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 10kΩ
S-Video IN
Y: 1V p-p 75Ω
(21-pin)
C:0.3V p-p 75Ω
Video (21 pin)
1Vp-p 75Ω
Audio (21 pin)
500mV rms 1kΩ
Selectable output (21 pin)
Audio (RCAx2) 500mV rms 10kΩ
Video (RCAx1) 1V p-p 75Ω
Colour Television
TX-28LD4DP
TX-25LD4DP
EURO4 Chassis
Dolby Surround Out 5 x Dolby Surround Out RCA
(Rear)
External Speaker connections
2 x Rear
1 x Centre
1 x External Bass(3D Subwoofer)
28,5kV ±1kV
High Voltage:
Picture Tube:
A66ECF50X41
{A59ECF50X41
Audio Output:
Front Left/Right
(Music Power)
External Centre
External Bass
Surround
8Ω Impedance
Headphones:
8Ω Impedance
3,5 mm
Accessories
supplied :
Remote Control
2 x R6 (UM3) Batteries
TS-600DP Video cabinet / Speaker pack
Dimensions:
Height:
596,5 mm
Width:
778 mm
Depth:
481 mm
Net weight:
33kg
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
NOTE:
This Service Manual should be used in conjunction with
the EURO4 Technical Guide.
ORDER No. SM-98019
{28,2kV ±1kV}
66cm
59cm}
2 x 20W
20W
26W
2 x 15W
{550,5 mm}
{730 mm}
{478,5 mm}
{27kg}
Panasonic CS ( U.K. ) Ltd.
WILLOUGHBY ROAD,
BRACKNELL,
BERKS.,
RG12 8FT.

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Table of Contents
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Summary of Contents for Panasonic TX-28LD4DP

  • Page 1 Video (21 pin) 1Vp-p 75Ω Audio (21 pin) 500mV rms 1kΩ Selectable output (21 pin) AV3 IN Audio (RCAx2) 500mV rms 10kΩ Video (RCAx1) 1V p-p 75Ω Panasonic CS ( U.K. ) Ltd. WILLOUGHBY ROAD, BRACKNELL, BERKS., RG12 8FT. 3DQDVRQLF...
  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS................................2 SERVICE HINTS ..................................3 SERVICE POSITION.................................4 ADJUSTMENT PROCEDURE..............................5 ADJUSTMENT PROCEDURE AND SELF-CHECK ........................6 WAVEFORM PATTERN TABLE ...............................7 ALIGNMENT SETTINGS................................8 BLOCK DIAGRAMS ..................................9 PARTS LOCATION .................................14 REPLACEMENT PARTS LIST ..............................15 SCHEMATIC DIAGRAMS ...............................26 CONDUCTOR VIEWS................................32 SAFETY PRECAUTIONS GENERAL GUIDE LINES It is advisable to insert an isolation transformer in the The potential at any point should not exceed AC supply before servicing a hot chassis.
  • Page 3: Service Hints

    SERVICE HINTS How to remove the rear cover Remove the 12 screws as shown in Fig.2. SCREWS Fig.2. LOCATION OF CONTROLS FOCUS N-BOARD SCREEN C-BOARD K-BOARD H-BOARD Y-BOARD E-BOARD Fig.3.
  • Page 4: Service Position

    HOW TO MOVE THE CHASSIS INTO SERVICE POSITION Remove the bead clamper from the mains lead and attach to the degauss coil, shown in Fig.5. Hold and lift the rear of the E-PCB chassis and gently pull the chassis toward you, as shown in Fig.4. Release the respective wiring clips and rotate the chassis horizontally through 90°, anti-clockwise.
  • Page 5: Adjustment Procedure

    ADJUSTMENT PROCEDURE The remote control is used for entering and storing adjustments, with the exception of Cut-off adjustments, which must always be done prior to service adjustment. Perform adjustments in accordance with screen display. The display on the screen also specifies the software version as well as the approx. setting values. The adjustment sequence for the service mode is indicated below.
  • Page 6: Adjustment Procedure And Self-Check

    ADJUSTMENT PROCEDURE Item / Preparation Adjustments Set the +B voltage up as follows:- +B SET-UP Adjust R811 so that B2 shows 148V±1V. Receive a Greyscale signal. Confirm the following voltages. Set the controls :- ± 0,25V ± 0,25V 12 ± 0,5V 33 ±...
  • Page 7: Waveform Pattern Table

    WAVEFORM PATTERN TABLE Vert Drive Vert Out VFLB IC451 Pin 2 IC601 Pin 31 IC451 Pin 3 20mS 20mS 20mS H - Out H - Out H - Pulse IC601 Pin 50 IC701 Pin 5 Base Q503 64µS 64µS 64µS HFLB HFLB Video Out...
  • Page 8: Alignment Settings

    ALIGNMENT SETTINGS (The figures below are nominal and used for representative purposes only.) Alignment Function Settings / Special features H-Pos Horizontal Position Optimum setting. V-Pos Vertical Position Optimum setting. H-Amp Horizontal Amplitude Optimum setting. V-Amp Vert. Amplitude Optimum setting. E/W-Amp1 EW-amplitude Optimum setting.
  • Page 9: Block Diagrams

    VIDEO BLOCK DIAGRAM Y - BOARD E - BOARD Q906 Q908 COILS Q905 Q907 Q909 IC601 61 V IN 1 Q950 Q951 TUNER Q104 IC351 SVM OUT 34 VIDEO PROCESSOR B OUT 39 Q353 Q305 Q306 43 B IN Q105 OUTPUT 42 G IN G OUT 38...
  • Page 10 AUDIO BLOCK DIAGRAM IC2101 E - BOARD AUDIO To K3 PROCESSOR I2S_DA_IN_2 18 I2S_DA_IN_2 I2S_DA_IN_1 12 I2S_DA_IN_1 I2S_DA_OUT 11 I2S_DA_OUT I2S_DA_WS 10 I2S_DA_WS I2S_DA_CL 9 I2S_DA_CL TUNER DACM_R 24 Q2102 IC251 Q252 AUDIO OUTPUT DACM_L 25 L 11 Q2103 Q251 From K8 Q101 Q102...
  • Page 11 DOLBY BLOCK DIAGRAM C - BOARD K - BOARD IC2704 Q2705 JK2702 Surround AUDIO Surround L Q2423 AMPLIFIER Centre Surround R Q2425 IC2703 Woofer Centre AUDIO JK2402 Q2426 Q2428 AMPLIFIER Woofer Q2703 Q2427 Q2704 IC2702 AUDIO AMPLIFIER To E12 I2S_DA_OUT_2 JK2401 IC2401 Q2405...
  • Page 12 CONTROL BLOCK DIAGRAM E - BOARD H - BOARD TUNER IC3401 VIDEO IC2101 SWITCHING AUDIO Q3401 IC601 SDA 1 PROCESSOR VIDEO PROCESSOR SCL 1 SERVICE / TEST K - BOARD SDA 1 IC2401 SCL 1 DOLBY PROCESSOR SDA 2 SCL 2 VPROT Q451 LOCAL...
  • Page 13 POWER SUPPLY BLOCK DIAGRAM C - BOARD R2714 Q2702 E - BOARD 5V SBY T2701 R2715 Q852 D2720 Q2701 D867 Q855 Q253 -18V D868 Q853 Q854 IC251 IC2702 IC2703 IC2704 AUDIO IC2701 AUDIO AUDIO AUDIO D862 OUTPUT T802 RL801 R854 POWER AMPLIFIER AMPLIFIER...
  • Page 14: Parts Location

    PARTS LOCATION NOTE: The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List.
  • Page 15: Replacement Parts List

    SPEAKER IC1102 27C2001-F10 EPROM * ENG27506G TUNER IC1104 MN1381-R(TA) DIODE EUR511200 REMOTE CONTROL IC1105 MN1381-T(TA) DIODE TBM8E1728 PANASONIC BADGE IC2101 MSP3410DPOB4 AUDIO PROCESSOR TBX8E050 POWER BUTTON IC2401 DPL3519APOA1 DOLBY PROCESSOR TKP8E1223 DOOR LID IC2402 AN6554 OPERATIONAL AMPLIFIER TKP8E1233 AV COVER...
  • Page 16 Cct Ref Parts Number Description Cct Ref Parts Number Description D553 1SR124-4AT82 DIODE D2404 MTZJT-7712C DIODE D554 1SR124-4AT82 DIODE D2405 MTZJT-7712C DIODE D556 MA165TA5 DIODE D2406 MTZJT-7712C DIODE D557 1SR124-4AT82 DIODE D2409 MA165TA5 DIODE D558 1SR124-4AT82 DIODE D2705 EG01CV0 DIODE D601 DAN217T146 DIODE...
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description L553 ELC08D682E COIL Q1107 BC847B TRANSISTOR L554 ELC18B102L COIL Q1108 BC847B TRANSISTOR Q2101 BC857B TRANSISTOR L601 TLTACT4R7K COIL L602 TLTACT4R7K COIL Q2102 BC857B TRANSISTOR Q2103 BC857B TRANSISTOR L603 TLTACT4R7K COIL Q2301 BC847B TRANSISTOR...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description JA54 ERJ6GEY0R00 S.M.CARB 0.1W JA30 ERJ8GEY0R00 S.M.CARB .125W JA52 ERJ6GEY0R00 S.M.CARB 0.1W ERJ8GEY0R00 S.M.CARB .125W ERJ6GEY0R00 S.M.CARB 0.1W JA59 ERJ8GEY0R00 S.M.CARB .125W JA48 ERJ6GEY0R00 S.M.CARB 0.1W ERJ8GEY0R00 S.M.CARB .125W JSE5 ERJ6GEY0R00 S.M.CARB 0.1W...
  • Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R374 ERD25TJ274 CARBON 0.25W 270K R703 ERG2FJ821 METAL R375 ERJ6GEYJ684 S.M.CARB 0.1W 680K R704 ERJ6GEYJ563 S.M.CARB 0.1W R376 ERJ6GEYJ183 S.M.CARB 0.1W R705 ERJ6GEYJ104 S.M.CARB 0.1W 100K R377 ERQ1ABJP5R1 METAL 0.5W R706 ERJ6GEYJ103 S.M.CARB...
  • Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description R951 ERJ6GEYJ391 S.M.CARB 0.1W R1166 ERJ6GEYJ912 S.M.CARB 0.1W R952 ERJ6GEYJ102 S.M.CARB 0.1W R1167 ERJ6GEYJ100 S.M.CARB 0.1W R953 ERJ6GEYJ750 S.M.CARB 0.1W R1168 ERJ6GEYJ473 S.M.CARB 0.1W R954 ERJ6GEYJ391 S.M.CARB 0.1W R1169 ERJ6GEYJ472 S.M.CARB 0.1W R1051...
  • Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description R2426 ERJ6GEYJ101 S.M.CARB 0.1W R2527 ERJ6GEYJ332 S.M.CARB 0.1W R2427 ERJ6GEYJ101 S.M.CARB 0.1W R2528 ERJ6GEYJ332 S.M.CARB 0.1W R2428 ERJ6GEYJ101 S.M.CARB 0.1W R2529 ERJ6GEYJ473 S.M.CARB 0.1W R2429 ERJ6GEYJ101 S.M.CARB 0.1W R2530 ERJ6GEYJ473 S.M.CARB 0.1W R2430...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 100nF C138 ECQB1H104J FILM R3017 ERJ6GEYJ101 S.M.CARB 0.1W 33µF C251 ECA1EM330B ELECT R3018 ERJ6GEYJ471 S.M.CARB 0.1W 22nF R3019 ERJ6GEYJ101 S.M.CARB 0.1W C252 ECUV1H223KBX S.M. CAP 4.7µF R3020 ERJ6GEYJ153 S.M.CARB 0.1W C253 ECA1HM4R7GB ELECT...
  • Page 23 Cct Ref Parts Number Description Cct Ref Parts Number Description 100nF C859 ECJ2VF1H104Z ELECT 350V C601 ECUV1H104KBX S.M. CAP 100µF 100µF C860 ECA1HM101GB ELECT C602 ECA1HM101GB ELECT 100nF C603 ECUV1H102JCX S.M. CAP C862 ECJ2VF1H104Z ELECT 350V 100µF 22nF C863 ECA1HM101GB ELECT C604 ECUV1H223ZFX...
  • Page 24 Cct Ref Parts Number Description Cct Ref Parts Number Description 3.3µF 1µF C2113 ECA1HM3R3GB ELECT C2439 ECA1HM010GB ELECT 100nF 100pF C2114 ECJ2VF1H104Z ELECT 350V C2440 ECUV1H101JCX S.M. CAP 220pF 10nF C2115 ECUV1H221JCX S.M. CAP C2441 ECUV1H103KBX S.M. CAP 220pF 10nF C2116 ECUV1H221JCX S.M.
  • Page 25 2.2nF C3022 ECUV1H222JCX S.M. CAP 1.5nF C551 ECKC3D152J CERAMIC 2.2nF C3023 ECUV1H222JCX S.M. CAP 47µF C3024 ECA1CM470GB ELECT DIFFERENCES FOR MODEL TX-28LD4DP 560pF C3026 ECUV1H561JCX S.M. CAP 470nF C3027 ECJ3VB1C474K ELECT 3.5KV 2.2nF MECHANICAL PARTS C3028 ECUV1H222JCX S.M. CAP 100µF...
  • Page 26: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODELS TX-28LD4DP / TX-25LD4DP (EURO-4 CHASSIS) IMPORTANT SAFETY NOTICE Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacturer's specified parts. NOTE RESISTOR All resistors are carbon ¼W resistor, unless marked otherwise.
  • Page 33 CONDUCTOR VIEWS E - BOARD TNP8EE009 TRAN’S DIODES D558 Q3601 L8 D3103 B7 D557 Q3007 M9 D3101 B7 D556 Q3001 N8 D3102 B7 D555 Q3006 N10 D2161 G9 D554 Q2304 I7 D2105 G10 D553 Q2303 M6 D2104 F9 D552 Q2301 I7 D2103 G10 D551 Q2103 I8...
  • Page 34 Y - BOARD TNP8EY012 TRANSISTORS Q909 Q908 Q907 Q906 Q905 Q354 Q353 Q352 Q351 DIODES D906 D905 D904 D902 D901 D364 D363 D362 D361 D360 D359 D358 D357 D356 D355 D354 TEST POINTS TPY6 B8 TPY5 D5 TPY4 E5 TPY3 F6 TPY2 E7 TPY1 G6 IC’S...
  • Page 35 K - BOARD TNP8EK005 TRAN’S Q2432 Q2431 Q2430 Q2429 Q2428 Q2427 Q2426 Q2425 Q2424 Q2423 Q2422 Q2421 Q2420 Q2419 Q2418 Q2417 Q2416 Q2410 Q2409 Q2407 Q2406 Q2405 Q2404 Q2403 Q2402 Q2401 IC’S IC2404 IC2403 IC2402 IC2401 DIODES D2409 D2408 D2406 D2405 D2402 D2401...
  • Page 36 C - BOARD TNP8EC003 TRAN’S Q2706 G10 Q2705 H6 Q2704 G7 Q2703 G9 Q2702 F9 Q2701 F9 DIODES D2720 E6 D2719 H10 D2718 G10 D2717 F3 D2716 F2 D2715 F6 D2714 F5 D2713 F8 D2712 F8 D2711 E7 D2710 C8 D2709 C2 D2708 C3 D2707 D6...
  • Page 37 ORDER No. SM-98052 Colour Television TX-28LD4DP TX-25LD4DP Additional information for Self-Check feature FACTORY SETTINGS To return customer settings to factory settings and clear owner ID of all information input by the customer, enter Self-Check mode.Press the down (-/v) button on the customer controls at the front of the TV set, at the same STATUS button on the remote control.

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Tx-25ld4dp

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