Panasonic TX-28LD4DPL Service Manual
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Panasonic TX-28LD4DPL Service Manual

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TX-28LD4DPL Service Manual
Safety
Specifications
Parts List
Service
Information
Adjustments
Self Check
Service Hints
Mechanical
View
Disassembly
Location of
Controls
Waveforms
Block Diagrams
Schematic Diagrams
PCB Views
Service Support
Service and repair of
this product is
supported by
Panasonic's LUCI
interface.
This interface provides a
link between the TV and
a standard PC to allow a
number of diagnostic
and control functions to
be performed.
For more details contact
your local Panasonic
company.
EXIT
BACK

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Summary of Contents for Panasonic TX-28LD4DPL

  • Page 1 TX-28LD4DPL Service Manual Safety Service Support Specifications Service and repair of Block Diagrams this product is Parts List supported by Panasonic's LUCI Service interface. Information This interface provides a Adjustments link between the TV and a standard PC to allow a...
  • Page 2 Audio Control Dolby Power supply Video BACK C - Schematic E - Schematic C - PCB E - PCB H - Schematic K - Schematic K - PCB Y - PCB N - Schematic Y - Schematic BACK BACK...
  • Page 3 ORDER No. SM-98030 Colour Television TX-28LD4DPL EURO4 Chassis SPECIFICATIONS Dolby Surround Out 5 x Dolby Surround Out RCA Power Source: 220-240V AC, 50Hz (Rear) External Speaker connections 2 x Rear Power Consumption: 116W 1 x Centre 1 x External Bass(3D Subwoofer) 28,5kV ±1kV...

  • Page 4: 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 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12 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 Q2103 L 11 Q251 From K8 Q101 Q102...
  • Page 13 DOLBY BLOCK DIAGRAM C - BOARD K - BOARD IC2704 Q2705 JK2702 Surround AUDIO Surround L Q2423 AMPLIFIER Centre Surround R Q2425 IC2703 Woofer Centre JK2402 AUDIO Q2426 Q2428 AMPLIFIER Woofer Q2703 Q2427 Q2704 IC2702 AUDIO AMPLIFIER To E12 I2S_DA_OUT_2 JK2401 IC2401 Q2405...
  • Page 14 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 15 POWER SUPPLY BLOCK DIAGRAM C - BOARD R2714 Q2702 E - BOARD 5V SBY T2701 Q852 R2715 D2720 Q2701 D867 Q855 Q253 -18V D868 Q853 Q854 IC251 IC2702 IC2703 IC2704 AUDIO IC2701 AUDIO AUDIO AUDIO D862 OUTPUT T802 RL801 POWER R854 AMPLIFIER AMPLIFIER...

  • Page 16: Parts Location

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

  • Page 17: Replacement Parts List

    SPEAKER IC601 VDP3108BPPB1 VIDEO PROCESSOR ENG27508G TUNER IC701 TEA2031A HORIZONTAL OUTPUT EUR511200 REMOTE CONTROL IC801 STRF6654LF51 POWER SUPPLY TBM8E1728 PANASONIC BADGE IC850 SE140N ERROR AMPLIFER TBX8E050 POWER BUTTON IC851 L78M12MRB 12V REGULATOR TKP8E1223 DOOR LID IC853 AN78L08TA 8V REGULATOR TKP8E1233...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description D502 1SR124-4AT82 DIODE D2402 MA165TA5 DIODE D511 MA4047 DIODE D2403 MTZJT-7712C DIODE D551 ERD07-15L7 DIODE D2404 MTZJT-7712C DIODE D552 RU3LFA1 DIODE D2405 MTZJT-7712C DIODE D553 1SR124-4AT82 DIODE D2406 MTZJT-7712C DIODE D554 1SR124-4AT82 DIODE...
  • Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description Q1104 BC847B TRANSISTOR L603 TLTACT4R7K COIL Q1105 BC847B TRANSISTOR L604 TLTACT4R7K COIL Q1106 BC847B TRANSISTOR L606 TLTACT4R7K COIL L607 ELJFC2R2KF COIL Q1107 BC847B TRANSISTOR Q1108 BC847B TRANSISTOR L701 ELC10D822E COIL Q2101 BC857B TRANSISTOR...
  • Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description JA40 ERJ6GEY0R00 S.M.CARB 0.1W R102 ERJ6GEYJ103 S.M.CARB 0.1W JA22 ERJ6GEY0R00 S.M.CARB 0.1W R103 ERJ6GEYJ222 S.M.CARB 0.1W JA15 ERJ6GEY0R00 S.M.CARB 0.1W R104 ERJ6GEYJ332 S.M.CARB 0.1W ERJ6GEY0R00 S.M.CARB 0.1W R105 ERJ6GEYJ101 S.M.CARB 0.1W JA21 ERJ6GEY0R00...
  • Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description R372 ERQ12AJ121 FUSIBLE 0.5W R701 ERQ12AJ101 FUSIBLE 0.5W R373 ERJ6GEYJ220 S.M.CARB 0.1W R702 ERQ12HJ8R2 FUSIBLE 0.5W R374 ERD25TJ274 CARBON 0.25W 270K R703 ERG2FJ821 METAL R375 ERJ6GEYJ684 S.M.CARB 0.1W 680K R704 ERJ6GEYJ563 S.M.CARB 0.1W...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description R936 ERQ1CJP331 FUSIBLE R1168 ERJ6GEYJ473 S.M.CARB 0.1W R951 ERJ6GEYJ391 S.M.CARB 0.1W R1169 ERJ6GEYJ472 S.M.CARB 0.1W R952 ERJ6GEYJ102 S.M.CARB 0.1W R1170 ERJ6GEYJ273 S.M.CARB 0.1W R953 ERJ6GEYJ750 S.M.CARB 0.1W R1171 ERJ6GEYJ224 S.M.CARB 0.1W 220K R954...
  • Page 23 Cct Ref Parts Number Description Cct Ref Parts Number Description 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 ERJ6GEYJ101 S.M.CARB 0.1W R2531 ERJ6GEYJ103 S.M.CARB 0.1W R2431 ERJ6GEYJ471 S.M.CARB 0.1W R2532 ERJ6GEYJ103 S.M.CARB 0.1W R2432...
  • Page 24 Cct Ref Parts Number Description Cct Ref Parts Number Description 33µF R3019 ERJ6GEYJ101 S.M.CARB 0.1W C258 ECA1EM330B ELECT 33µF R3020 ERJ6GEYJ153 S.M.CARB 0.1W C259 ECQM1H684J FILM R3021 ERJ6GEYJ750 S.M.CARB 0.1W C260 ECA1VM102GB ELECT C261 ECA1VM102GB ELECT R3022 ERJ6GEYJ102 S.M.CARB 0.1W 390nF R3023 ERJ6GEYJ123...
  • Page 25 Cct Ref Parts Number Description Cct Ref Parts Number Description 15nF 100µF C608 ECUV1H153KBX S.M. CAP C869 ECA1EM101GB ELECT 15nF 470µF C609 ECUV1H153KBX S.M. CAP C870 ECA1EM471GB ELECT 15nF 470µF C610 ECUV1H153KBX S.M. CAP C871 ECA1CM102B ELECT 15nF 470µF C611 ECUV1H153KBX S.M.
  • Page 26 Cct Ref Parts Number Description Cct Ref Parts Number Description 100nF 2.2nF C2122 ECJ2VF1H104Z ELECT 350V C2456 ECUV1H222KBX S.M. CAP 220pF 1µF C2123 ECUV1H221JCX S.M. CAP C2457 ECA1HM010GB ELECT 70pF 2.2nF C2124 ECUV1H070DTX S.M. CAP C2458 ECUV1H222KBX S.M. CAP 47pF 1µF C2125 ECUV1H470JCX...
  • Page 27 Cct Ref Parts Number Description Cct Ref Parts Number Description 470nF C2752 ECQM1H474J FILM 3.3nF C2753 ECUV1H332KBX S.M. CAP 3.3nF C2755 ECUV1H332KBX S.M. CAP 22µF C2756 ECA1CM220GB ELECT 2.2nF C3001 ECUV1H222JCX S.M. CAP 2.2nF C3002 ECUV1H222JCX S.M. CAP 47µF C3003 ECA1CM470GB ELECT 560pF...

  • Page 28: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODEL TX-28LD4DPL (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 35 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 36 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 37 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 38 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...

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