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Sharp 37GT-28FP Service Manual
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Sharp 37GT-28FP Service Manual

Sharp 37GT-28FP Service Manual

Pal / secam system colour television
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ELECTRICAL SPECIFICATION.......................3
IMPORTANT SERVICE NOTES.......................4
SERVICE ADJUSTMENTS...............................5
PRINTED WIRING BOARDS..........................12
COMPONENT LOCATION TABLES................14
ICs ADDITIONAL INFORMATION..................17
SERVICE MANUAL
PAL / SECAM SYSTEM COLOUR TELEVISION
MODEL
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
BLOCK DIAGRAM..........................................30
TROUBLESHOOTING TABLES......................32
PART LIST.......................................................37
PACKING OF THE SET...................................42
SHARP CORPORATION
1
SQUAD-T
37GT-28FP
This document has been published to
be used for after sales service only.
37GT-28FP
S0037GT28FP00
Issued:14th March 2002
CHASSIS

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Summary of Contents for Sharp 37GT-28FP

  • Page 1: Table Of Contents

    37GT-28FP SERVICE MANUAL S0037GT28FP00 Issued:14th March 2002 SQUAD-T CHASSIS PAL / SECAM SYSTEM COLOUR TELEVISION 37GT-28FP MODEL 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.
  • Page 2 37GT-28FP SERVICE MANUAL UPDATE LOG SHEET Technical Report No. Application Cause / Solution Part No. Page No. Data /Serial No. Technical Bulletin No. Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc. If only part number changes are required, just change part number directly the part number in the Parts Listing Section.

  • Page 3: Electrical Specification

    37GT-28FP ELECTRICAL SPECIFICATIONS •Sound Carrier Trap •Power Input .......220V-240 Volts AC 50Hz L’............40.4MHz •Power Consumption L............32.4MHz B/G............33.4MHz Normal Operating........30W •Adjacent Sound Carrier Trap (Method IEC60107) L’............32.4MHz Stand-by Operating........7.5W L, B/G...........40.4MHz •Audio Power Output Rating .....2W (MPO) •Adjacent Picture Carrier Trap Ω...

  • Page 4: Important Service Notes

    37GT-28FP 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.

  • Page 5: Service Adjustments

    37GT-28FP SERVICE ADJUSTMENT Service Mode Function All required adjustments for servicing this TV set, may be done in «Service Mode», excepting G2 and FOCUS. How to access the Service Mode 1. Turn the receiver on and ensure that it is tuned into a test pattern.
  • Page 6 37GT-28FP 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.
  • Page 7 37GT-28FP VALUE DESCRIPTION ADDRESS VALUE DESCRIPTION ADDRESS CAG ADJUSTEMENT VALUE AFT FINE FOR B/G AND L TV OPTIONS SYSTEMS b7: ENGLISH OSD AFT FINE FOR L' SYSTEMS b6: AUTOINSTALLATION FIRST VOLUME LIMIT (MAXIMUM) OPTION RESERVED b5: CHILD LOCK ENABLED b7: X...
  • Page 8 37GT-28FP VALUE DESCRIPTION ADDRESS VALUE DESCRIPTION ADDRESS b0: HOTEL MODE: DEACTIVATE BEGINING OF HORIZONTAL THE TV PANEL FRONTAL KEY. CLAMP PULSE. IT STARTS UP IN SCART MODE VOLTAGE TO CHANGE TO L-L' WHEN SSW SIGNAL IS GIVEN SYSTEM b1: SPECIAL HOTEL MODE FOR S.E.I.S.
  • Page 9 37GT-28FP 5.5. Push “GREEN” button on R/C (to exit Bus Stop Mode). 5.6. Switch set OFF and ON again, setting is now memorized. Screen Adjustment 1. Focus Adjustment 1.1. Apply mains voltage of 220V AC/50HZ to TV. 1.2. Receive Philips pattern signal to a level between 60 and 80 dB/uV.
  • Page 10 37GT-28FP 1.8. Exit Service Mode and check colour coordinates «X» and «Y» at 20 and 120 nits. It may be necessary to repeat the same procedure or readjust the cuts as show the be below one. 2. «CUT R», «CUT G»...
  • Page 11 37GT-28FP c) Neither one will be able to get the sound volume in a superior level to the maximum limited in each case. Procedure: A) Press the volume up or volume down buttons as far as the NVM address displays 0E location.

  • Page 12: Printed Wiring Boards

    37GT-28FP F7323N3 MOTHER BOARD UNIT PWB. Component side. K7323BM D1001 F7323BMN3 C304 S1001 S1002 S1003 S1004 C1001 Q302 S701 C878 C302 C701 R304 JL1, R885 Q301 R303 C307 Q885 C308 C312 C876 R305 R883 C303 Q883 R302 JF12 C874 R315...
  • Page 13 37GT-28FP F7323N3 MOTHER BOARD UNIT PWB. Copper side. Q1004 RMC001 D1005 R1021 D1001 C304 R1019 S1004 S1003 S1002 S1001 Q304 L301 C1001 R312 S701 Q303 R864 FB301 C878 + R304 R307 C315 C701 R893 C Q301 R311 F7324BMN3 R303 D862...

  • Page 14: Component Location Tables

    37GT-28FP F7325N1 FRONT A / V UNIT PWB. Copper side. Component side. R1316 C1310 C1311 C1400 R1420 D1321 C1320 C1300 R1321 C1301 F7325BMN1 F7325N1 FRONT A / V PWB COMPONENT LOCATION TABLES Copper side. Component side. Ref_No Ref_No C1320 18135 14859...
  • Page 15 37GT-28FP MOTHER UNIT F7323N3 PWB COMPONENT LOCATION TABLES. Component Side. Ref_No Ref_No Ref_No Ref_No Ref_No Ref_No 17526 178562 C714 91948 151892 IC801 114046 57912 81534 152146 Q501 102870 120396 R607 51816 73406 22860 95504 C717 20828 134620 135636 201676 113030 138684...
  • Page 16 37GT-28FP MOTHER UNIT F7323N3 PWB COMPONENT LOCATION TABLES. Copper Side. Ref_No Ref_No Ref_No Ref_No Ref_No Ref_No C1002 134874 123952 C871 110998 190754 140716 52324 Q706 101092 138684 R201 135128 45466 R534 113284 105156 C1003 134874 121920 C872 118364 204470 77470 26924...

  • Page 17: Ics Additional Information

    37GT-28FP ICs ADITIONAL INFORMATION SDA 5552 (IC 1001) Micronas Intermetall Data Sheet: “SDA55XX TVText Pro” http://www.micronas.com/products/documentation/consumer/sda555x/downloads/sda55xx_1ds.pdf STV2238 (IC 801) FEATURES DESCRIPTION C BUS CONTROL. The STV223XD/223X/224X are fully bus con- trolled ICs for TV including PIF, SIF, luma, chroma PIF CIRCUIT WITH PLL DEMODULATION and deflection processing.
  • Page 18 37GT-28FP STV2238 (IC 801) STV 22XX FAMILY CHARACTERISTICS Application PAL/SECAM/NTSC PAL/NTSC PAL/NTSC Package QSS/INTERCARRIER QSS/INTERCARRIER INTERCARRIER SHRINK56 STV2238/48 STV2237/47 STV2236/46/86 TQFP64 STV2238D STV2237D STV2236D STV 22XX IC VERSIONS IC Version SHRINK56 TQFP64 Function 2236 2237 2238 2246 2247 2248 2286...
  • Page 19 37GT-28FP STV2238 (IC 801) Pin N° STV224X/8X STV223X STV223XD Symbol Description SDIP56 SDIP56 TQFP64 SIFIN1 SIF Input SIFIN2 SIF Input AGCSIFCAP AGC SIF Capacitor Voltage Reference Filtering AGCPIFCAP AGC PIF Capacitor PIFIN1 PIF Input PIFIN2 PIF Input TUNERAGCOUT AGC Tuner Output...
  • Page 20 37GT-28FP STV2238 (IC 801) Pin N° STV224X/8X STV223X STV223XD Symbol Description SDIP56 SDIP56 TQFP64 CVBSOUT1 Main Video Switch Output Chroma/Scanning Power Supply (8 V) Beam Current Limiter Control Voltage and BCL/SAF Safety Input (XRAY) VERT Vertical Output Pulse HOUT Horizontal Output Pulse...
  • Page 21 37GT-28FP TDA16833 (IC 701) Off-line SMPS Controller with TDA16831-4 600 V Sense CoolMOS on Board Preliminary Data CoolSET Overview Features • PWM controller + sense CoolMOS attached in one compact package • 600 V avalanche rugged CoolMOS Ω • Typical = 0.5 ...
  • Page 22 37GT-28FP TDA16833 (IC 701) Device Output Power Range/ Output Power Range/ Required Heatsink Required Heatsink = 85-270 VAC = 190-265 VAC TDA 16831 10 W / no heatsink 10 W / no heatsink TDA 16832 20 W / 6 cm...
  • Page 23 37GT-28FP TDA16833 (IC 701) Block Diagram...

  • Page 24: Schematic Diagram, Wave Forms

    37GT-28FP DESCRIPTION OF SCHEMATIC DIAGRAM NOTE: SAFETY NOTE: 1. The unit of resistance «ohm»is omitted (K=1000 1. DISCONNECT THE AC PLUG FROM THE AC ohms. M= Megaohm). OUTLET BEFORE REPLACING PARTS. 2. All resistors are 1/8 watt. unless otherwise noted.
  • Page 25 37GT-28FP Vc HORIZONTAL SANDCASTLE VERTICAL INPUT VERTICAL VERTICAL OUTPUT REMOTE CONTROL OUT SPEAKER IF VIDEO OUT RED OUT BLUE OUT GREEN OUT VIDEO INPUT TXT uC...
  • Page 26 37GT-28FP SCHEMATIC DIAGRAM ( 00 Version) Page 28...
  • Page 27 37GT-28FP SCHEMATIC DIAGRAM (00 Version) Page 29...
  • Page 28 37GT-28FP SCHEMATIC DIAGRAM ( 00 Version)
  • Page 29 37GT-28FP SCHEMATIC DIAGRAM ( 00 Version)

  • Page 30: Block Diagram

    37GT-28FP BLOCK DIAGRAM S1001 S1002 S1003 S1004 VOL+ VOL- AC 220-240V 50HZ IC1002 P701 N0304CE F701 T3.15A +150V SC881 VD842CE 150V H.V. Q883 S 7 0 1 Q885 HEATER Q887 L701 A D G C O I L FOCUS PWB-B...
  • Page 31 37GT-28FP BLOCK DIAGRAM RMC0001 RMCU0222CE J 3 0 1 D 1 0 0 5 S P 3 0 1 P 3 0 1 Q1001 Audio N.C. N.C. OUT FRONT Q305 VDD 2.5 VDD 3.3 Mute VDD 3.3 VDD 2.5 N.C.

  • Page 32: Troubleshooting Tables

    37GT-28FP TROUBLESHOOTING TABLES. NO PICTURE Check Picture setting by R/C. Signal should be received. Check the tuner supply and band biases. Both must be approx. 5V DC Normal Is tuning voltage normal at Pin (2) of Tuner? Check Q1001, IC1001, IC1003 -Check the AGC Voltage: Pin (1) of Tuner.
  • Page 33 37GT-28FP NO SOUND Check Sound setting by R/C. Signal should be received. Does approx. 20V DC appear on C710? Check D707, C710 Does Sound Signal appear at Pin(6) of IC801? Check IC801, C301 Audio Amplifier muted? Check IC1001, Q305 Check R304, Q301, Q302...
  • Page 34 37GT-28FP NO RASTER Fuse Blown Check F701 Normal Check Voltage on C705 Replace Fuse (Approx. 325V DC) Fuse Blown Normal again Check Voltage on C711 Check IC701 Approx. 0V Abnormal (Approx. 105V DC) Normal Normal Check D708, D717 Check CRT connector K1...
  • Page 35 37GT-28FP NO VERTICAL SCAN Is IC501 bias normal? Check R510, Q501, Check D709, D710, IC501 Q502, Q503 NEITHER VERTICAL NOR HORIZONTAL SYNCHRONIZATION Check IC801, C815, C816, R818 DEFECTIVE VERTICAL AMP. AND VERTICAL LINEARITY Readjust Vertical Size. Vertical size is abnormal...
  • Page 36 37GT-28FP NO SPECIFIC COLOUR some colour produced in B/W Broadcast reception? Check IC801, C812, C813, R813, X801 the white balance properly adjusted? The Picture Colour is The Picture Colour is The Picture Colour is Red or cyan. green or magenta.

  • Page 37: Part List

    37GT-28FP PART LIST REF No. PARTS DESCRIPTION SN CODE EX CODE Q 1002 RH-TX0232BMZZ TRT BC847B SMD PHILIPS S AA REPLACEMENT PARTS Q 1003 RH-TX0232BMZZ TRT BC847B SMD PHILIPS S AA Replacement parts which have special safety characteristics are identi-...
  • Page 38 37GT-28FP REF No. PARTS DESCRIPTION REF No. PARTS DESCRIPTION SN CODE EX CODE SN CODE EX CODE C 0510 VCCCTV1HH101J CERAM C 100PF 50V 2125SMD S AA PACKAGED CIRCUITS C 0601 RC-KZ0038CEZZ CERAMIC CAP 470pF 2KV S AA PR 0701...
  • Page 39 37GT-28FP REF No. PARTS DESCRIPTION REF No. PARTS DESCRIPTION SN CODE EX CODE SN CODE EX CODE C 1019 VCEA0A1HW226M ELEC C 22UF 20% 50V S AA R 0530 VRD-RA2BE274J RES 270KOHM 5% 1/8W S AA C 1020 VCEA0A1HW225M ELEC C 2,2UF 20% 50V...
  • Page 40 37GT-28FP REF No. PARTS DESCRIPTION REF No. PARTS DESCRIPTION SN CODE EX CODE SN CODE EX CODE J 0021 VRS-TV1JD000J 2125 0 OHM 5% 1/10W SMD S AA R 1011 VRD-RA2HD472J RES 4.7KOHM 5% 1/2W S AA J 0024 VRS-TV1JD000J...
  • Page 41 S AC (SH) QCNW-2761BMZZ WIRE (AB) 2WAYS 32" 16:9 S AA CABINET PARTS CCABA1379BMV0 CABINET SET 37GT28FP S AM HBDGB1018BMSB SILVER SHARP BADGE S AA HDECQ0036BMSA R/C DECORATION S AA HDECQ0035BMSA LED DECORATION S AA JBTN-1047BMSA UP/DOWN BUTTON S AA...

  • Page 42: Packing Of The Set

    37GT-28FP PACKING OF THE SET SPAKX4051BMZZ Pack-ad SPAKR500A1500 Wrapper FRONT SPAKC5476BMZZ Carton Box...

  • Page 43: Remote Control Description

    37GT-28FP REMOTE CONTROL DESCRIPTION Infrared Transmitter Window Aim this window at the infrared sensor on your TV set CALL ( )/CHILD LOCK ( ) button SOUND MUTE ( ) button TV/VIDEO Select button POWER/STANDBY ( ) button Single/Double Entry button (...
  • Page 44 SHARP ELECTRONICA ESPAÑA S.A. PRINTED BY: TV Division Think Ecology, please use Engineering Dept.

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