Service manual

ManualsBrandsSharp ManualsTV51GT-25H

54GT-25S

MODEL 54GT-25S

GA-1 CHASSIS

Issued: 24nd Nov ‘00

SERVICE MANUAL

SHARP CORPORATION

PAL SYSTEM COLOUR TELEVISION

SESG54GT25S00

In the interests of user safety (required by safety

regulations in some countries) the set should restored

to its original condition and only parts identical to

those specified should be used.

This document has been published to

be used for after sales service only.

ELECTRICAL SPECIFICATION........................3

IMPORTANT SERVICING NOTES ..................4

SERVICE ADJUSTMENTS...............................5

PRINTED WIRING BOARDS...........................12

SOLID STATE DEVICE BASE DIAGRAM.......20

SCHEMATIC DIAGRAM, WAVE FORMS........21

TROUBLESHOOTING TABLES......................28

PARTS ALLOCATION TABLES.......................16 PART LIST.......................................................30

BLOCK DIAGRAM...........................................26

CONTENTS

TELETEXT

Summary of content (36 pages)

PAGE 1
54GT-25S SERVICE MANUAL SESG54GT25S00 Issued: 24nd Nov ‘00 GA-1 CHASSIS PAL SYSTEM COLOUR TELEVISION TELETEXT MODEL 54GT-25S In the interests of user safety (required by safety regulations in some countries) the set should restored to its original condition and only parts identical to those specified should be used. CONTENTS ELECTRICAL SPECIFICATION........................3 IMPORTANT SERVICING NOTES ..................4 SERVICE ADJUSTMENTS...............................5 PRINTED WIRING BOARDS.........
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54GT-25S SERVICE MANUAL UPDATE LOG SHEET Technical Report # Technical Bulletin # Cause / Solution Part # Page # Application Data /Serial # Use this page to keep any special servicing information as Thecnical Report (Bulletin), Technical Information, etc. If only part number changes are required, just change part number directly on Part List Section. If you need more information, please refer to the Technical Report (Bulletin).
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54GT-25S ELECTRICAL SPECIFICATIONS •Sound Carrier Trap.............................33.4MHz •Power Input .......................220V-240 Volts AC 50Hz •Power Consumption Normal Operation....................................52W •Adjacent Sound Carrier Trap................40.4MHz Stand-by Operation.................................7.0W •Audio Power Output Rating .....................4W (MPO) •Adjacent Picture Carrier Trap...............31.9MHz Speaker..........................
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54GT-25S IMPORTANT SERVICING NOTES Only qualified service personnel are allowed to carry out mintenance and repair of this receiver. SERVICING OF HIGH VOLTAGE SYSTEM AND CRT It is important that the static charge is removed from the high voltage system when carrying out work on the receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from the CRT cavity connector to the CRT ground tag. This must be carried out with the AC supply disconnected from the reciver.
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4GT-25S SERVICE ADJUSTMENT •SERVICE MODE FUNCTION 1. Connect a test pattern to the antenna terminal. 2. Tune the receiver to this signal. 3. Turn the receiver off using the mains switch. 4. Press the volume down and channel up buttons on the front of the receiver at the same time. 5. Keeping these buttons pressed, turn the mains on. 6. When the set starts up it will be in service mode. 7. Release the two buttons. • • • • Use the channel up and down buttons to move between the options.
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54GT-25S Adjustment of Data within the NVM memory To access the NVM memory, press the channel up button on the remote control until the NVM setting is reached. Note that the NVM address is shown in green and the NVM value is shown in red. Each of the NVM values are stored as a hexadecimal code, each code comprises of two hexadecimal numbers. Each of these numbers will break down into bit four binary code as in the example below.
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54GT-25S " " " ! # ! $ ! % & '# % ( ) & ') & ' * & ' * ( + # & ' * & ' # & ' & ' & ') ( & ' * * & '
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54GT-25S " " ∼ ∼ " ! * ) ) ) ) ) ) ) * * *! * 0. . . . . . .
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54GT-25S PAGE 1 ADDRESS A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 ∼ FF DESCRIPTION VALUE 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 FF PAGE MEMORY FOR LIST MODE PROGRAM 1 PAGE MEMORY FOR LIST MODE PROGRAM 2 PAGE MEMORY FOR LIST MODE PROGRAM 3 PAGE MEMORY FOR LIST MODE PROGRAM 4 PAGE MEMORY FOR LIST MODE PROGRAM 5 PAGE MEMORY FOR L
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54GT-25S •PIF/AGC Adjustment •Screen Adjustment 1. AFT Adjustment 3. Focus Adjustment AFT must be adjusted to a fixed value of 40. 1. Apply mains voltage of 220V AC/50HZ to TV. 2 . Receive Philips pattern signal to a level between 60 and 80 dBµV. 3 . Set contrast to 10/10, brightness to 5/10 and colour 0/10. 4 . Adjust focus potentiometer to obtain maximum definition. 2. RF-AGC Cut-In Adjustment (I2C BUS) 4. G2 Adjustment 1 . Receive the «COLOUR BAR» signal (Channel E- 1.
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54GT-25S •COLOUR ADJUSTMENT PROCEDURES 1. Y-DLY a) Receive Philips pattern signal. b) When ∧ button is pressed, luma phase delays. c) When ∨ button is pressed, chroma phase delays. d) Adjust the chroma-luma delay. 2. «B-GAIN», «G-GAIN», «R-GAIN» a) Adjust G2. b) Tune a white pattern c) Adjust colour to minimum. d) Position colourmeter in the center of screen. e) Using brightness and contrast buttons, select a luminance of »120 nits.
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54GT-25S F 7320NOB PRINTED WIRING BOARD. Components side. 25 S1001 24 S1002 S1003 S1004 D1021 C1004 K + RMC1 QKITP7320BMN D1011 23 F7320BMN0 B P883 L701 VA701 C702 (G) L702 J816 J435 9 1 P702 J910 21 9 10 11 8 7 2 F701 6 J815 5 3 R751 T751 D702 D701 T3.15AL T3.
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54GT-25S F 7320NOB PRINTED WIRING BOARD. Components side. 25 DIP C1004 L303 24 + B (K) P882 5 D811 J150 D503 J201 R1063 J806 SF201 C508 C249 J316 CF302 1 1 D202 J324 J317 C225 D203 33V J141 4 TU201 R429 R366 C410 D410 J126 D201 3 CLK C213 2 (L2) VT + D402 A9.
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54GT-25S F 7320NOB PRINTED WIRING BOARD. Copper side. 25 5 J401.
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54GT-25S F 7320NOB PRINTED WIRING BOARD. Copper side.
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54GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (component side): Ref No (L3) (L3). (L4) A1 A1. A2 A5 A6 A7 A7. A8 A8. A9 A9. B1 B1. B2 B3 B3. B4.
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54GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (component side): Ref No J317 J318 J319 J320 J321 J322 J323 J324 J325 J326 J328 J329 J330 J331 J332 J334 J335 J336 J337 J338 J339 J340 J341 J343 J344 J345 J346 J347 J348 J349 J400 J401 J401.
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54GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (copper side): Ref No C1001 C1002 C1003 C1005 C1008 C1009 C1011 C1012 C1013 C1015 C1016 C1023 C1024 C1025 C1026 C1027 C1028 C1029 C1030 C1032 C1033 C1035 C201 C202 C203 C204 C207 C209 C210 C211 C212 C214 C215 C216 C217 C218 C219 C220 C221 C223 C226 C227 C228 C229 C230 C231 C237 C238 C240 C242 Xmm 212725 217424 227838 217297 204851 203200 217170 221361 217551 227711 217551 232156 235585 232156 213614 228219 228346 191770 224536 228219 196469 239268 180340 20142
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54GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (copper side): Ref No R361 R362 R363 R364 R402 R403 R404 R412 R415 R416 R418 R419 R421 R422 R423 R424 R425 R426 R427 R428 R434 R435 R436 R500 R503 R505 R508 R509 R510 R511 R513 R515 R516 R517 R519 R520 R525 R526 R527 R528 R529 R530 R531 R532 R533 R601 R607 R608 R612 R613 Xmm 176657 201422 189738 187198 191516 183261 156210 174244 160274 168021 162560 148336 200279 194310 199136 197104 195199 187325 189230 173355 148717 150495 158242 143002 107569 122555 120015
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64 54GT-25S C 1 E K A 6 4 1 3 B C E SOLID STATE DEVICE BASE DIAGRAM A K 33 E 52 B C 32 B C E 33 C 32 27 8 27 52 5 1 8 4 51 5 20 52 1 1 26 4 27 52 52 1 64 27 8 5 RH-IX1812BMZZ RH-IX1818BMZZ 33 1 33 32 27 K E A 6 8 4 1 4 64 5 1 K A 1 6 3 1 B 5 20 1 51 19 4 52 26 26 52 4 8 RH-TX0199BMZZ 20 4 C E 52 B 1 19 64 27 27 1 8 C E 5 1 3 64 1 8 51 4 1 A E K B C 1 33 E A 6 C 32 4 K B C E A 1 4 1 3 3 B C E 20 S A
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54GT-25S DESCRIPTION OF SCHEMATIC DIAGRAM NOTE: 1. The unit of resistance «ohm»is omitted (K=1000 ohms. M= Megaohm). 2. All resistors are 1/8 watt. unless otherwise noted. 3. All capacitors are µF, unless otherwise noted (P= µµF). 4. The capacitor with Part No. RC-FZ9XXXBMNJ is designed to with stand 63V. 5. The capacitor with Part No. RC-FZ4XXXBMNJ is designed to with stand 50V. SAFETY NOTE: 1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE REPLACING PARTS. 2.
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L704 G0408BM ADG COIL 5 6 D718 (15V) EX0419BM R706 .27 (1W) (NVV) H-TX0217BM Q702 BC337 R707 220. R704 560K (1/2W) C708 .068 (50V) FZ4683BM FZ4153BM C707 .015 (50V) R720 47K D701 DX0571BM R709 33 D707 DX0045BM D706 DX0045BM C729 680pF Q701 H-TX0199BM (ANB80FP) 1 D705 DX0539BM C705 .01 (250V) KZ0029CE R703 5.6 (5W) (WKP) D702 DX0571BM C718 220pF (2KV) KZ3035CE R705 560K (1/2W) C704 .01 (250V) KZ0029CE .
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H OUT C603 .015 (50V) FZ4153BMNJ -7.6 Q603 BC547 H-TX0142BM R601 12K R722 8.2M (1/2W) (UA) R721 8.2M (1/2W) (UA) C709 .0033 (50V) FZ4332BMNJ -1.6 -1.6 H-TX0217BM -1.5 1.9 -5.6 -1.7 C609 .01 R602 330 (1/2W) R605 1.5 (1/2W) C604 220 (10V) Q604 BC636 H-TX0112BM L601 4.7uH (CF) 3 -1.5 (1/2W) R710 1K C710 .001 R709 33 Q602 BC635 H-TX0118BM C722 3300P (4K) KZ0106GE H-TX0217BM Q703 BC337 C708 .068 (50V) FZ4683BM 0 C622 220 (10V) Q601 BU508DFI H-TX0132BM 2 D610 DX0045BM R604 1.
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Page 22 6 1 VIDEO C1027 100nF R613 D602 DX0045BM FLY BACK H OUT 100 R838 820 R1037 10K C607 39P R803 4R7 C909 4700P D603 DX0045BM 680 R836 D802 DX0045BM R1021 22K C1026 100pF R1022 10K D1012 10 42 R612 15K C810 .1(Z) R801 100K C806 100 (16V) R1072 1M L1004 12uH 11 C807 .022 Q1003 BF840 H-TX0113BM C1003 100nF +3.3V 10K R1066 R1080 3K3 9 8 7 6 43 41 40 13 R615 15K 14 C825 .1 R904 0 C1024 150pF 60 59 58 57 56 55 54 53 52 C820 18P . . . . . . .
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20 V-IN . V-OUT R410 82 R408 220 R407 47 (1/2W) V-B V-A FB R518 1.5 (1/2W) +8V R R414 82 C420 47 (16V) R404 1K D603 DX0045BM D412 DX0045BM C236 220 (25V) D602 DX0045BM R513 1K8 D511 (3.6V) EX0404BM R418 1K Q401 BC337 H-TX0217BM C610 .01 VIDEO Page 23 C613 4700P G R417 82 C421 47 (16V) R416 1K C412 10nF FB304 SF201 G1984 RFILC0274BM D510 (3.6V) EX0404BM C612 1 (50V) R615 15K R420 82 C422 47 (16V) B . . GND GND VL VERT B VERT A . . . . .
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54GT-25S BLOCK DIAGRAM S1004 VOL+ VOL- . . 4 AC 220-240V 50HZ 1 S1003 2 CH- . S1002 CH+ . S1001 I 3 51GT25H . 8 . . 7 6 5 . IC1002 (A) P701 N0304CE F701 T3.15A 1 2 3 +150V H (H) SC881 VD842CE 2 7 Q885 9 Q887 3 52 H.V. . 51 IC1001 CRT Q872 2 ADG COIL 4 3 6 G2 (G) 8 5V 2 3 4 . . 2,5V . FOCUS PR701 PWB-B DUNTK7284BMN2 L703 F T700 16 1 2 . 4 3 . R G B (K) 5V 20V 8 GND . P881A (L2) . . 5 1 L702 1 MUTE .
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54GT-25S BLOCK DIAGRAM RMC0001 RMCU0222CE 2 I J301 1 D1021 2 6 7 5V 3 1 5 4 3 7V OUT 1 . 1 . SP301 2 Q1003 X1001 . 2 . P301 6 MHZ 3.3V H 18 19 28 27 VCC GND VH AGC RESET 17 29 L/L´ 16 30 U 15 31 VSYNC 14 32 IR 13 33 BG/L 12 H 11 34 V R 10 35 VL G 9 36 ANA GND B 8 37 ANA VCC BLK CVBS 38 ANA VCC 7 39 ANA GND KEY 6 40 GND KEY VCC 5 41 VCC2.5 SDA KEY 4 42 VCC SCL 3 43 GND 44 FRONT 45 AGC 46 VCC2.
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54GT-25S TROUBLESHOOTING TABLES. NO FUNCTION(NO SOUND AND NO PICTURE) Is D1011 (LED) on a light? Not light Yes, red Broken Check Q701, D718, C718 and Q601 Check F701, R703 and Q701 Check Q711 emitter voltage Approx. 0 V Normal Approx. 3.3 V Check R737, D713,Q704, IC1001 and IC1003. Check D724 Broken Check C206 Voltage Approx. 0 V Check D708, C711 and IC701 Normal Check R204, Q209 and Q500. Approx. 8 V Check Q601, D708 and C711 Check Q709 emitter Voltage Approx.
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54GT-25S TROUBLESHOOTING TABLES.
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54GT-25S PART LIST TROUBLESHOOTING TABLES. REPLACEMENT PARTS Replacement parts which have special safety characteristics are identified in this manual. Electrical components having such features are identified by ! in the Replacement Part List. The use of a substitute replacement part which does not have the same safety characteristics as the factory recommended is not permitted. Replacement parts not shown in this service manual may create shock fire, or other hazards.
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54GT-25S 4 56 7 m " m m m m m m m m m m m m m m " # . # . # . # . # . # . *m# # . # . # . # . # . # . # . # .
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54GT-25S 4 56 7 k " " " " "
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54GT-25S 4 56 7 k " " " "
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54GT-25S 4 56 7 " " " " " " " " " $ $ $ $ $ $ $ $ " $ $ $ $ $ $ " $ $ $ $ $ $ $
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54GT-25S 4 56 7 8 9 # * * o $ $ $ * * * + $ $ $ o # * o
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37GQ-20FP RECYCLED PAPER PRINTED BY: 22 ON: