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Sanyo HT28745 Service Manual
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Sanyo HT28745 Service Manual

Remote control digital color tv
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SERVICE MANUAL

DOLBY
DOLBY
D I G I T A L
D I G I T A L
Servicing should be performed by only trained and qualified service personnel.
Contents
Safety Instructions . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . 3 - 17
Service Hints . . . . . . . . . . . . . . . . . . . . . . 18
Mechanical Disassemblies. . . . . . . . . . . 19
Chassis Electrical Parts List . . . . . . 20 - 36
Cabinet Parts List . . . . . . . . . . . . . . . . . . 37
Locations . . . . . . . . . . . . . . . . . . . 38 - 45
Block Diagrams . . . . . . . . . . . . . . . . 46 - 51
Troubleshooting Flow Charts . . . . . 52 - 54
Control Port Function . . . . . . . . . . . . . . . 55
Schematic Inserts . . . . . . . . . . . . . . 57 - 72
Schematic Notes . . . . . . . . . . . . . . . . . 57
Pin Layouts . . . . . . . . . . . . . . . . . . . . . 57
Waveforms. . . . . . . . . . . . . . . . . . 58 - 60
Main Board. . . . . . . . . . . . . . . . . . 61 - 64
Power and Deflection Board. . . . 65 - 66
Front Board . . . . . . . . . . . . . . . . . 67 - 68
AV Switching / Video Board . . . . 69 - 72
CRT Socket / VM Board . . . . . . . . 69 - 72
HT28745, H3JAM, PRODUCT CODE 111375980
Remote Control Digital
Color Television

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz
Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω
Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),
Remote Ready . . . . . . . . . . 32 Key Remote Control
Sound Output . . . . . . . . . . . . . . . . . . . . . . 5.0 W/CH
Intermediate Frequency
Picture Tube . . . . . . . . . . . . . . . . . W70ELC011X221
Semiconductors
Cabinet Dimensions
AS
FILE NO.
HT28745
ORIGINAL VERSION
Chassis No. 28745-00
NOTE: Match the Chassis No. on
the unit's back cover with
the Chassis No. in the
Service Manual.
If the Original Version
Service Manual Chassis
No. does not match the
unit's, additional Service
Literature is required. You
must refer to "Notices" to the
Original Service Manual
prior to servicing the unit.
140W (Avg), 2.5A (Max)
01, 14 - 94, 95 - 125 (CATV)
Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz
Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz
Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz
Integrated Circuits . . . . . . . . . . . . . . . . . . . . . . . 30
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Except within Tuners, RC Pre-Amp. & Digital Module
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 858 mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 543 mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 538 mm
REFERENCE No.
(U.S.A.)
(CANADA)
UHF/VHF/CATV
Digital
14 - 69 (UHF),
1 - 99 (Digital)
SM
780106

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  • Page 1: Table Of Contents

    Height ......543 mm Depth ......538 mm HT28745, H3JAM, PRODUCT CODE 111375980 REFERENCE No.

  • Page 2: Safety Instructions

    SAFETY INSTRUCTIONS SAFETY PRECAUTIONS WARNING: The chassis of this receiver has a floating READING SHOULD NOT EXCEED 750 mV. AC VOLTMETER ground with the potential of one half the AC line voltage in (5000 ohms per volt or more sensitivity) respect to earth ground.

  • Page 3: Service Adjustments

    SERVICE ADJUSTMENTS GENERAL This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments. ON-SCREEN SERVICE MENU SYSTEM 1. Enter the Service Menu: • While pressing the – VOLUME key on the front control panel, XXXXXXXXXXX reconnect the AC power cord.
  • Page 4 SERVICE ADJUSTMENTS (Cont.) INITIAL BUS DATA SETUP (Cont.) 11. Select NO. 110 CROF2SYS (CR Offset / System ) with L or M key. Adjust the data with number keys for AC. 12. Select NO. 111 YOF4VD2VF (Y Offset / VM Dly VM F0 ) with L or M key. Adjust the data with number keys for 0E. 13.
  • Page 5 Table 1. ON-SCREEN SERVICE MENU When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should be checked and be set up or readjusted according to the procedures described in the following pages. Initial Setup Data marked with an * should be changed from Initial Reference Data.
  • Page 6 SERVICE ADJUSTMENTS (Cont.) Table 1. ON-SCREEN SERVICE MENU (Continued) INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY 1I-CON 00000000 1125I CONTRAST H-CON 00000000 HDMI CONTRAST D-CON 00000000 DIGITAL CONTRAST W-CON 00000000 LETTER BOX CONTRAST RF-HUE 00000000 TINT...
  • Page 7 INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY RF-CMD 00000000 RF CTI_MODE(0) 4I-CMD 00000000 480I CTI_MODE(0) 4P-CMD 00000000 480P CTI_MODE(0) 1I-CMD 00000000 1080I CTI_MODE(0) H-CMD 00000000 HDMI CTI_MODE(0) D-CMD 00000000 DIGITAL CTI_MODE(0) 1I-GAM 00000010 1125I GAMMA(1-0) RF-LMD 00000000...
  • Page 8 SERVICE ADJUSTMENTS (Cont.) Table 1. ON-SCREEN SERVICE MENU (Continued) INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY 4P-RYB 00001000 480P RYB(3-0) 1I-RYB 00001000 1080I RYB(3-0) H-RYB 00001000 HDMI RYB(3-0) D-RYB 00001000 DIGITAL RYB(3-0) RF-GYR 00001000 RF GYR(3-0) 4I-GYR...
  • Page 9 INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY CFHSI 00000000 VIDEO1/2-FULL H_SIZE CFHPO 00000000 VIDEO1/2-FULL H_POSITION CFLBK 00000000 VIDEO1/2-FULL L_BLK CFRBK 00000000 VIDEO1/2-FULL R_BLK CFVAS 00000000 VIDEO1/2-FULL V_ASPECT CFVSR 00000000 VIDEO1/2-FULL V_SCROLL CWUBK 00001000 VIDEO1/2-LETTER BOX LO_BLK CWLBK 00001011...
  • Page 10 SERVICE ADJUSTMENTS (Cont.) Table 1. ON-SCREEN SERVICE MENU (Continued) INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY 7PLBK 00000000 720P-FULL LO_BLK 7PVS 00000000 720P-FULL V_SIZE 7PVPS 00000000 720P-FULL V_POSITION 7PHSI 00000000 720P-FULL H_SIZE 7PHPO 00000111 720P-FULL H_POSITION 7PLBK...
  • Page 11 INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY RZVAS 00000000 RF-ZOOM V_ASPECT RZZSW 00000000 RF-ZOOM ZOOM_SW RZVSR 00000000 RF-ZOOM V_SCROLL 00000000 RF PRELIMINARY CZVS 00000000 VIDEO1/2-ZOOM V_SIZE CZVPS 00000000 VIDEO1/2-ZOOM V_POSITION CZVAS 00000000 VIDEO1/2-ZOOM V_ASPECT CZVSR 00000000 VIDEO1/2-ZOOM V_SCROLL...
  • Page 12 SERVICE ADJUSTMENTS (Cont.) Table 1. ON-SCREEN SERVICE MENU (Continued) INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY DWLBK 00001011 DIGITAL-LETTER BOX LO_BLK DWVS 00000000 DIGITAL-LETTER BOX V_SIZE DWVPS 00000000 DIGITAL-LETTER BOX V_POSITION DWVBS 00000001 DIGITAL-LETTER BOX VBLK_SW DWVAS 00010010...
  • Page 13 INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY 00000000 NOT AVAILABLE 01001000 VIDEO MUTE TIME 00010000 AKB DETECT TIME 00000000 NOT AVAILABLE 00000000 NOT AVAILABLE – R/B DRIVE – – – R / B DRIVE LEVEL ADJUSTMENT –...
  • Page 14 SERVICE ADJUSTMENTS (Continued) VERTICAL SIZE ADJUSTMENT ANTENNA CONNECTIONS 1. Tune receiver to an active analog channel. This receiver is designed for UHF/VHF and Digital RF recep- tion. A 75 ohm terminal is provided for UHF/VHF reception 2. Check the vertical size of the picture. If the vertical size and a separate 75 ohm terminal is provided for Digital RF is too large or small, perform steps 3 ~ 6.
  • Page 15 Drive Level Adjustment 7. Set the data with numeric key to 2E with numeric keys. 13. Select “Drive Level Adjustment” Menu (between 8. Select NO. 10D (SCO4: Sub Contrast, Bit 7 - 4) with L or M key. NO. 08E and NO. 0B0) with L or M key. The Menu dis- play will appear.

  • Page 16: Input Level Adjustment

    SERVICE ADJUSTMENTS (Continued) HIGH VOLTAGE HOLD-DOWN TEST MULTI-SOUND SECTION ADJUSTMENTS Every time the receiver is serviced, the HIGH VOLTAGE Note: Multi-Sound Section must be adjusted after HOLD-DOWN circuit must be tested for proper operation by A101 (U/V Tuner), IC3601 (MTS Decoder), Digital following these steps: Module or IC802 (EEPROM) is replaced.
  • Page 17 OSD ADJUSTMENT PINCUSHION CORRECTION ADJUSTMENT 1. Connect a color-bar generator to the analog antenna 1. Connect a color-bar generator to the analog antenna terminal. terminal and select a crosshatch pattern. 2. Set the picture controls to the Sports level. 2. Set the picture controls to the Sports level. 3.

  • Page 18: Service Hints

    SERVICE HINTS POWER FAILURE DETECTOR This unit is equipped with a Power Failure Detector function Check the following if the unit is turned off by the power included in the CPU which checks for an abnormal condi- failure detector. tion in the chassis power supplies, including the power supply derived from the Horizontal Output Transformer.

  • Page 19: Mechanical Disassemblies

    MECHANICAL DISASSEMBLIES CHASSIS REMOVAL CABINET BACK REMOVAL 1. Remove cabinet back. 1. Refer to Figure 1, remove 14 screws. 2. Discharge the picture tube anode (2nd anode lead) to the 2. Pull off cabinet back and remove. dag coating (picture tube grounding lead). 3.

  • Page 20: Chassis Electrical Parts List

    CHASSIS ELECTRICAL PARTS LIST CAUTION: To Protect against electrical shock and for continued product safety, refer to SAFETY PRECAUTIONS, X-RADIATION PRECAUTIONS, HIGH VOLTAGE HOLD-DOWN TEST, and PRODUCT SAFETY NOTICE on Page 2. PRODUCT SAFETY NOTICE PRODUCT SAFETY SHOULD BE CONSIDERED WHEN A REPLACEMENT IS MADE IN ANY AREA OF A RECEIVER. COMPONENTS INDICATED BY A STAR (#) IN THIS PARTS LIST AND THE SCHEMATIC DIAGRAM DESIGNATE COMPONENTS IN WHICH SAFETY CAN BE OF SPECIAL SIGNIFICANCE.
  • Page 21 Schematic Schematic Part No. Part No. Description Description Location Location C835 403 235 0300 CERAMIC 56P J MAIN PC BOARD C836 403 235 0300 CERAMIC 56P J C837 403 235 4605 CERAMIC 270P K CAPACITORS C840 403 224 5507 CERAMIC 22P J C001 404 084 3900...
  • Page 22 Schematic Schematic Part No. Description Part No. Description Location Location C2943 404 084 2705 ELECT 10U M DIODES C2945 404 084 2705 ELECT 10U M D101 645 076 3502 SURGE-ABSORBER C2950 403 279 0106 CERAMIC 0.1U Z D651 407 223 5209 DIODE RK46 015-304 C2951 404 084 2804...
  • Page 23 Schematic Schematic Description Description Part No. Part No. Location Location 405 163 1602 TR 2SC2812N-L6-TB IC803 409 495 7103 IC CAT24WC08P 405 163 1701 TR 2SC2812N-L7-TB 409 463 6206 IC M24C08-BN6 405 173 9803 TR 2SC3928A1R 409 383 6805 IC 24LC08B/P 405 173 9902 TR 2SC3928A1S IC804...
  • Page 24 Schematic Schematic Part No. Description Part No. Description Location Location 405 163 1602 TR 2SC2812N-L6-TB Q2906 (Cont.) 405 163 1602 TR 2SC2812N-L6-TB 405 163 1701 TR 2SC2812N-L7-TB 405 163 1701 TR 2SC2812N-L7-TB 405 173 9803 TR 2SC3928A1R 405 173 9803 TR 2SC3928A1R 405 173 9902 TR 2SC3928A1S...
  • Page 25 Schematic Schematic Description Description Part No. Part No. Location Location R824 401 024 7004 CARBON 1K JA 1/6W R1295 401 150 6209 MT-GLAZE 1K JA 1/10W R826 401 025 7805 CARBON 2.2K JA 1/6W R1296 401 256 7209 MT-GLAZE 18K JA 1/10W R827 401 024 6700 CARBON...
  • Page 26 Schematic Schematic Part No. Part No. Description Description Location Location R2950 401 026 9303 CARBON 47 JA 1/6W POWER / DEFLECTION R2951 401 256 0408 MT-GLAZE 12K JA 1/10W PC BOARD R2952 401 150 6100 MT-GLAZE 2.2K JA 1/10W R2953 401 026 9303 CARBON 47 JA 1/6W...
  • Page 27 Schematic Schematic Part No. Part No. Description Description Location Location # C609 404 096 2809 ELECT 680U M 200V D481 407 124 6404 DIODE ERA18-04 407 007 6606 DIODE ES1 C613 403 148 1708 ELECT 100U M # C614 403 083 4307 POLYPRO 0.022U J 400V 407 124 5506...
  • Page 28 Schematic Schematic Part No. Part No. Description Description Location Location Q582 405 011 8401 TR 2SC1740S-Q D649 408 008 2406 DIODE 1N4148 405 011 8500 TR 2SC1740S-R 407 013 4306 DIODE 1S2076A 405 011 8609 TR 2SC1740S-S 407 013 7109 DIODE 1S2473 405 012 2002 TR 2SC1815-GR...
  • Page 29 Schematic Schematic Part No. Part No. Description Description Location Location R494 401 019 2601 CARBON 39K GA 1/4W FRONT PC BOARD R495 401 024 9602 CARBON 12K GA 1/6W # R497 401 066 3002 OXIDE-MT 2.2 JA CAPACITORS R501 401 027 2501 CARBON 5.6K GA 1/6W # C600...
  • Page 30 Schematic Schematic Part No. Part No. Description Description Location Location TRANSISTORS 645 016 0479 HOLDER, FUSE Q688 406 000 6804 TR 2SA1015-GR(SAN) 645 070 5434 HOLDER, FUSE 405 001 7605 TR 2SA1015-Y(SAN) F601B 645 000 5077 HOLDER, FUSE 405 004 3208 TR 2SA564A-R(CU) 645 016 0479 HOLDER, FUSE...
  • Page 31 Schematic Schematic Part No. Part No. Description Description Location Location C2323 404 092 9208 ELECT 1000U M 6.3V C2537 403 279 0106 CERAMIC 0.1U Z C2538 403 279 0106 CERAMIC 0.1U Z C2324 404 092 9208 ELECT 1000U M 6.3V C2325 403 224 5705 CERAMIC...
  • Page 32 Schematic Schematic Part No. Part No. Description Description Location Location Q1223 (Cont.) 405 163 1503 TR 2SA1179N-M6-TB 405 015 8724 TR 2SC2812-L6-TB 405 015 8922 TR 2SC2812-L7-TB 405 163 2708 TR 2SA1179N-M7-TB 405 173 9605 TR 2SA1235A1E 405 163 1602 TR 2SC2812N-L6-TB 405 173 9704 TR 2SA1235A1F...
  • Page 33 Schematic Schematic Part No. Part No. Description Description Location Location R1052 401 162 2909 MT-GLAZE 220 JA 1/10W 405 002 0308 TR 2SA1037K-T-96-R R1056 401 256 2709 MT-GLAZE 75 JA 1/10W 405 002 0407 TR 2SA1037K-T-96-S R1057 401 162 2909 MT-GLAZE 220 JA 1/10W 405 002 6726...
  • Page 34 Schematic Schematic Part No. Part No. Description Description Location Location R2326 401 256 1702 MT-GLAZE 33K JA 1/10W R2538 401 150 5905 MT-GLAZE 10K JA 1/10W R2543 401 150 6209 MT-GLAZE 1K JA 1/10W R2327 401 150 5806 MT-GLAZE 100K JA 1/10W R2328 401 162 3708 MT-GLAZE...
  • Page 35 Schematic Schematic Part No. Part No. Description Description Location Location C1722 403 222 0603 ELECT 22U M 160V TRANSISTORS C1723 403 075 8009 CERAMIC 0.01U K 500V Q711 405 011 8401 TR 2SC1740S-Q C1724 403 071 5606 CERAMIC 220P K 405 011 8500 TR 2SC1740S-R C1748...
  • Page 36 Schematic Schematic Part No. Part No. Description Description Location Location Q753 (Cont.) 405 006 1707 TR 2SA933S-Q R734 401 027 2105 CARBON 56 JA 1/6W 405 006 1806 TR 2SA933S-R R735 401 012 4503 CARBON 100 JA 1/4W Q1702 405 011 8401 TR 2SC1740S-Q R736 401 008 6702...

  • Page 37: Cabinet Parts List

    610 313 2457 DEC AV SHEET-H3DAM 610 311 6402 CHASSIS RAIL- (3) 610 319 4172 ASSY, BUTTON UNIT-H3JAM 610 289 5148 CAP RC-G8EAM 610 319 4264 DEC PLATE 645 067 1333 SANYO BADGE 610 313 4093 DEC SHEET VIZON — 37 —...

  • Page 38: Component And Testpoint Locations

    COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD PARTS SIDE J821 J257 K9FRB K9FRA IC661 PB003A J259 J822 L654A C662 J837 J260 J838 J147 J261 9VTV-PF J839 J262 J263 D661 J148 J834 L654 C661 J835 J817 J818 J269 J5501 J149 JP005 J270 J811 D655 L652...
  • Page 39 MAIN BOARD FOIL SIDE J257 J258 J821 J259 PB003A IC661 J822 J146 K9FRA K9FRB C662 L654 J260 J147 J837 C663 IC661P1 J261 J838 L654A J262 J839 J148 D661 J263 D655 J834 L652 J835 J818 C661 J269 R634 J5501 JP005 R5507 Q825 R855 J149...
  • Page 40 COMPONENT AND TESTPOINT LOCATIONS (Cont.) POWER / DEFLECTION BOARD PARTS SIDE C634 PB401A R644 R645 K6GND4 C635 J644 Q641 J640 Q643 D645 J648 J643 D625 D612 J641 C649 R643 K6B3P K6B2P K6B1P C684 R616 R642 J647 R641 C632 C642 D613 D614 R605 J621...
  • Page 41 POWER / DEFLECTION BOARD FOIL SIDE R644 C634 R645 K6GND4 PB401A IC601 C635 J644 Q641 C635A J640 Q643 K6B2P K6B3P J648 D625H1 C649 D645 J643 J641 K6L1P K6B1P D612 C684 R643 D625 J647 R616 R641 L625 R642 C632 D614 L628 C642 C632A R605...
  • Page 42 COMPONENT AND TESTPOINT LOCATIONS (Cont.) CRT SOCKET / VELOCITY MODULATION BOARD PARTS SIDE 1AA4B10B11700 R723 R722 J715 C722 Q721 XL710 R739 XL720 R724 Q711 R714 R727 D762 R721 R713 R712 C712 IC721 D761 IC711 R711 R707 J702 J720 J705 D743 J723 C721 J706...
  • Page 43 CRT SOCKET / VELOCITY MODULATION BOARD FOIL SIDE 1AA4B10B11700 R723 R722 Q721 C722 XL720 J715 XL710 R739 R724 Q711 R714 R713 D762 R721 R727 R712 IC721 D761 C712 IC711 R711 R707 J702 J720 J705 D743 J723 C721 R715 J706 D722 D711 R716 J704...
  • Page 44 COMPONENT AND TESTPOINT LOCATIONS (Cont.) AV / VIDEO BOARD PARTS SIDE PWB,AV VIDEO-H3EMM B10B1160A J2501 Q2504 C2512 J2502 R2516 C2511 R2515 R2514 R2513 L1236 K25A R2343 IC2502 R2344 R2345 R2360 Q2505 IC2301 R1064 J2417 R2330 R1058 IC1201 R2329 C2517 Q2506 D2503 D2502 D2501...
  • Page 45 COMPONENT AND TESTPOINT LOCATIONS (Cont.) FRONT BOARD PARTS SIDE B10B10400 B A1901 SW1901 SW1902 SW1903 SW1904 SW1905 SW1906 PB1901A J1901 6A 125V D1901 L1902 R1903 LF602 LF601 T681 R1904 R1905 R1906 D1902 R1902 R1907 C1904 C1902 C1613 T681A JP601 R1910 C1620 C1901 C1614...

  • Page 46: Power Lines

    POWER LINES — 46 —...
  • Page 47 MAIN CPU DATA BUS LINES — 47 —...
  • Page 48 SIGNAL LINES — 48 —...

  • Page 49: Block Diagrams

    IC2501 CRT DRIVER BLOCK DIAGRAM — 49 —...
  • Page 50 IC3601 AUDIO PROCESSOR BLOCK DIAGRAM — 50 —...
  • Page 51 IC3401 AUDIO CONTROL BLOCK DIAGRAM TONE TONE MONa SR FIL OUTa LINEa IN1a IN2a 2 VOL 1 TONE VOL 2 IN3a 3 IN4a 4 NJRC IICBUS Surround Interface "eala" & Simulated Stereo IN1b IN2b 29 VOL 1 VOL 2 TONE IN3b 28 IN4b 27 Bias...

  • Page 52: Troubleshooting Flow Charts

    TROUBLESHOOTING FLOW CHARTS NO POWER fuse (F601) open? Check: Varistor (VA601), Diode Bridge (D601), resistor (R601) Posistor (PS601), IC (IC601/602), Transistor (Q402) open? the voltage Check: IC (IC1611), Diode (D1612/1613/ 1614/ 1615/1901), to "5VAL" line Transformer (T681) supplied? Check: arround CPU (IC801), IC (IC802/803), Crystal (X8219), Relay (RL601), All 0V...
  • Page 53 NO PICTURE Check: RF(TV) only All Modes? Line: A101 17pin - IC1201 41pin Parts: Around A101 (TU_IF) Check: Check: AV1 only Line: Line: IC1201 7pin (CV) IC1201 1pin (CV) IC1201 9pin (Y) IC1201 3pin (Y) IC1201 11pin (C) IC1201 5pin (C) only (Composite or S) Check:...

  • Page 54: Audio Output

    TROUBLE SHOOTING FLOW CHARTS (Cont.) NO SOUND All Modes ? Is there Check: signal at speaker Speaker (SP901, SP902) terminal ? Check: Is there signal at IC001 2pin (L) Line: IC001 6pin - IC801 (CPU) 2pin (Mute) Parts: Around IC001 (Audio AMP.) or 4pin (R) ? Check: Parts: Around IC3401 (Audio Control), Q3410 (L), Q3420 (R)

  • Page 55: Control Port Function

    CONTROL PORT FUNCTION System Control (CPU : IC801) Pin Name Function I/O Description P11/SCL1 IIC bus clock for TV P00/PWM0 Audio AMP mute out Active : High P01/PWM1 DM Reset out Reset Output : Low P02/PWM2 BPF-SW Active : High P03/PWM3/AD1 Key in P04/PWM4/AD2 AVSW2 Active : High...
  • Page 56 For parts or service contact SANYO Fisher Service Corporation 21605 Plummer Street Chatsworth, CA 91311 (U.S.A.) 300 Applewood Crescent, Concord, Ontario L4K 5C7 (CANADA) April / 2005 / 2000 SMC Printed in U.S.A. — 56 —...

  • Page 57: Board Connections & Locations

    MODEL HT28745 Chassis No. 28745-00 SP-L ASSY,PWB,FRONT-H3EMM SP901 K6GND KFRONT KFRONT2 BOARD CONNECTIONS Board Connections A10B03800 AND LOCATIONS Degaussing – SCHEMATIC DIAGRAMS W601 K1904 L901 Coil SP-R SP902 K1901 K1902 NOTES ON SCHEMATIC DIAGRAMS A10B03800 – 1. All resistance values in ohms K=1,000 M=1,000,000.

  • Page 58: Main Board

    MODEL HT28745 Chassis No. 28745-00 To Front Board To Front Board (K1901) (K1902) Audio AMP IC001 Main Board LA42072N-E K9FRB K9FRA R010 R008 8.2K C007 AMUTE 25EM100 C013 C001 LBWA EM10 EM10 LBWA LBWA To Speakers C006 IC801 L_IN Reset EM4.7...
  • Page 59 MODEL HT28745 Chassis No. 28745-00 To Video Board (K25A) P/D Board T601 L621 Switching AGND (Power and Deflection) Transformer D615 14V_TV C619 14V_TV R621 P-FAIL KZ0.01F 14V_TV 4.7K To Main Board C622 AC Smoothing 25EM R618 D618 3300CD (K6PDA) C614...
  • Page 60 MODEL HT28745 Chassis No.28745-00 To Power/Def. Board (K6J) CRT Drive (RGB AMP) R719 IC711 180K IC711H1 IC711H2 R-OUT TDA6118JFN2 CRT VM Board K17J R739 W900 R729 Q711 DJ1KB CRT GROUNDING ASSY. Q900 R711 K702 R713 W70ELC011X221 XL710 C711 L711 C1723...

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