Sharp 37GQ-20S Service Manual Download Page 26

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37GQ-20S
37GQ-21S

NO VERTICAL SCAN

YES

Check D709, D710, IC501

DEFECTIVE VERTICAL AMP.

AND VERTICAL LINEARITY

Readjust Vertical Size.

Check D505, D506

Check Q505, Q507, Q509

NEITHER VERTICAL NOR

HORIZONTAL SYNCHRONIZATION

Check IC801, C815, C816, R818

Vertical size is abnormal

Vertical linearity is abnormal

Is IC501

bias normal?

Check R510, Q501,

Q502, Q503

Summary of Contents for 37GQ-20S

Page 1: ...in some countries the set should restored to its original condition and only parts identical to those specified should be used Issued 9th June 00 This document has been published to be used for after sales service only ELECTRICAL SPECIFICATION 2 IMPORTANT SERVICE NOTES 3 SERVICE ADJUSTEMENTS 4 PRINTED WIRING BOARDS 11 SCHEMATIC DIAGRAM WAVE FORMS 13 PART LIST 18 TROUBLESHOOTING TABLES 23 CONTENTS ...

Page 2: ... when servicing this chassis To prevent electric shock do not remove cover No user serviceable parts inside Refer servicing to qualified service personnel Convergence Self Converging System Focus Bi Potencial Electrostatic Sweep Deflection Magnetic Specifictions are subject to change without prior notice Aerial Input Impedance VHF UHF 75 ohm Unbalanced Tuning Ranges CATV Special Channels B G 48 25...

Page 3: ...g precautions should be observed 1 When repairing the circuit be sure not to increase the high voltage to more than 25 5 KV at beam 1000µΑ for the set 2 To keep the set in a normal operation be sure to make it function on 22 4KV 1 5KV at beam 800µΑ in the case of the set The set has been factory adjusted to the above mentioned high voltage Alwayscheckthehighvoltageifthereisanypossibilitythatitmigh...

Page 4: ...OS VERT POS VERT AM Displayed on screen Hexadecimal Decim Range Function 00 03H 00 63H S L VL N 4 43 3 58 SECAM NTSC 4 43 NTSC 3 58 AUTO PNS AUTO PN AUTO 50HZ 60HZ 0 63d 0 63d 0 63d 0 63d 0 63d 0 63d 0 63d 0 15d Indicates operative Service Mode Access to NVM memory Auto Gain Control Auto Gain Starting Point Line PLL time constant Colour system Field Frequency Blue Gain Green Gain Green Cut Red Gai...

Page 5: ...ection can be made by pressing button NVM LIST DESCRIPTION BANK ADDRESS DESCRIPTION VALUE 00H 00H ZONE FOR TUNNING INFORMATION BEGIN CAH 3BH ZONE FOR TUNNING INFORMATION END 10H 3CH STAND BY 44H ON 40H OFF 44H 3DH OPTION BYTE 10XXXXXX HOTEL MODE 1 START IN PRG1 NO TUNNING OPTION VOLUME LIMITATION 11XXXXXX HOTEL MODE 2 START IN PRG 1 NO TUNING OPTION VOLUME LIMITATION START IN SCART MODE OUT FROM S...

Page 6: ...EH ONE CHIP REGISTER 1E 00H 1FH ONE CHIP REGISTER 1F 00H 20H VPOS_50 VERTICAL POSITION 4 3 50 Hz 12H 21H VAMP_50 VERTICAL AMPLITUDE 4 3 50 Hz 0FH 22H VPOS_60 VERTICAL POSITION 4 3 60 Hz 0FH 23H VAMP_60 VERTICAL AMPLITUDE 4 3 60 Hz 0FH 24H HSHIFT_60 HORIZONTAL SHIFT 60Hz 1DH 25H HSHIFT_50 HORIZONTAL SHIFT 50Hz 22H 26H FINVFH STEP FOR FINE TUNING IN VHF BAND 00H 27H VHF1_STEP THICK TUNING STEP FOR V...

Page 7: ...IP REGISTER 12 00H 13H ONE CHIP REGISTER 13 20H 14H ONE CHIP REGISTER 14 20H 15H ONE CHIP REGISTER 15 00H 16H ONE CHIP REGISTER 16 1FH 17H ONE CHIP REGISTER 17 20H 18H ONE CHIP REGISTER 18 2BH 19H ONE CHIP REGISTER 19 00H 1AH ONE CHIP REGISTER 1A 90H 1BH ONE CHIP REGISTER 1B 90H 1CH ONE CHIP REGISTER 1C 90H 1DH ONE CHIP REGISTER 1D 00H 1EH ONE CHIP REGISTER 1E 00H 1FH ONE CHIP REGISTER 1F 00H 20H ...

Page 8: ...H ONE CHIP REGISTER 09 A1H 0AH ONE CHIP REGISTER 0A 32H 0BH ONE CHIP REGISTER 0B B2H 0CH ONE CHIP REGISTER 0C 32H 0DH ONE CHIP REGISTER 0D 20H 0EH ONE CHIP REGISTER 0E 20H 0FH ONE CHIP REGISTER 0F 18H 10H ONE CHIP REGISTER 10 1FH 11H ONE CHIP REGISTER 11 00H 12H ONE CHIP REGISTER 12 00H 13H ONE CHIP REGISTER 13 20H 14H ONE CHIP REGISTER 14 20H 15H ONE CHIP REGISTER 15 00H 16H ONE CHIP REGISTER 16 ...

Page 9: ...etween 60 and 80 dBµV 2 Apply High Voltage Probe to Pin 8 of CRT socket 3 4 Adjust G2 potentiometer until obtaining 525V 10 5 Check BKGD If it is necessary adjust BKGD according to instructions detailed in the next page 2BH BG_COARSE THICK TUNING ADJUSTMENT FOR L AND BG 0AH 2CH BG_FINE FINE TUNING ADJUSTMENT FOR L AND BG 00H 2DH LP_FINE FINE TUNING ADJUSTMENT FOR L 00H 2EH DELAY SEARCH XXXXXXX0 SH...

Page 10: ...on colourmeter in the the left point of Fig 4 f Using brightness and contrast buttons select a luminance of 120 nits g Operate again in Service Mode and select location B GAIN and G GAIN to obtain colour coordinates X 0 290 0 015 Y 0 300 0 015 h 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 re adjust the cuts as show t...

Page 11: ...J55 C805 C820 C207 RMC001 S1004 S1003 S1002 S1001 K D1001 C1009 J6 J43 J44 K7287BM F7287BMN1 F7288BMN1 ESPA A R608 J32 C301 A C406 X801 D202 D602 J45 J47 J53 L602 C401 1 H 4 C604 C605 J73 R714 C702 D702 PR701 C704 R406 J65 C703 D701 D703 A 3 2 1 R612 R617 C601 C609 R616 C608 TP601 TP602 R611 C713 D710 E Q887 B E Q872 B R883 G2 C876 B Q883 E R885 1 H 4 SH S B Q870 E R864 R305 C308 C307 C302 R304 R3...

Page 12: ...J68 J64 C203 J56 C210 C202 R204 C801 J55 C201 L201 C805 C820 C802 C206 RMC001 S1004 S1003 S1002 S1001 K D1001 C1009 J6 IC1001 R1016 R1017 R1002 R1001 J43 J44 C715 C207 SF201 R608 J32 C301 F7287BMN1 F7288BMN1 A A C406 D401 K R512 R513 L1002 C1003 C1002 R802 R801 R803 J54 C809 X801 C219 R216 R218 C220 C218 R217 Q203 R215 R207 R206 R214 C204 L205 R210 D202 Q202 Q201 R209 R208 L204 R205 C217 D602 J45 ...

Page 13: ...V A 2µs 200V VERT CH1 FREQ 100KHz CH1 P P 504 V CH1 100V A 2µs 100V VERT CH1 FREQ 100KHz CH1 P P 472 V CH1 2V A 10µs 1 00V VERT CH1 FREQ 15 6KHz CH1 P P 8 56 V CH1 200V A 10µs 200V VERT CH1 FREQ 15 6KHz CH1 P P 1 00 kV CH1 1V A 10µs 1 00V VERT CH1 FREQ 15 6KHz CH1 P P 5 40 V CH1 1V A 5ms 2 50 V VERT THE AREA ENCLOSED BY THIS LINE IS DIRECTLY CONNECTED WITH AC MAINS VOLTAGE WHEN SERVICING THE AREA ...

Page 14: ... 2K7 1 2W L861 12uH C860 470pF R866 15K 2W R862 15K 2W 7 R899 0 8 R887 2K7 1 2W Q885 TX0180BM C701 470nF 275V FZ0160BM C871 470pF 6 R892 1K C876 4 7nF 2KV R864 15K 2W D811 DX0045 D862 DX0045 A N0304CE R893 1K R881 470 C861 470pF D861 DX0045 4 Q883 TX0180BM C872 470pF L3 QTIPM0017CEFM R898 0 S701 P0588 C873 470pF Q871 TX0181 BF422 3 D860 DX0045 Q887 TX0180BM K N0561 D812 DX0045 C878 10uF 200V C715 ...

Page 15: ...ND 14 H N0461CE F N0505CE R714 820 1 2W R517 180K C503 330nF Q505 2SA1037 R525 120 VS VS _ IC501 UA741 8 7 6 5 4 3 2 1 220nF R519 8K2 R617 1K Q502 BC635 D503 1N4933 C717 10uF 16V C605 100nF R603 330 1 2W R609 2 2 1 2W Q603 TX0112 BC636 R605 6 8 1 2W Q602 BC635 R523 560 R536 4K7 R516 1K D605 DX0504 1N4934 R613 15K C606 22nF R706 680 TQ R710 220 1 2W C607 100uF 35V FB701 BLN 0020 C722 10uF 16V R722 ...

Page 16: ...DD 39 SCL 38 SDA 37 PC2 36 PC3 35 PC4 34 DA5 1 PB1 2 PB2 3 PB3 4 PB4 5 PB5 6 PB6 7 PA0 8 PA1 9 PA2 10 PA3 11 12 12 PA4 13 PA5 14 PA6 15 PA7 16 VSS 17 R 18 G 19 B 20 BLANK 21 HSYNC 22 PC5 33 PC6 32 PC7 31 VS 30 RESET 29 XTAL 28 XTAL 27 26 26 OSD 25 OSD 24 VSYNC 23 L1002 68uH C1004 15pF C1005 15pF R807 1K R302 4K7 1 2W R823 1K R1021 4K7 R1022 4K7 R1020 5K6 R1019 1K Q1002 2SC2412 C1011 22nF R808 1K S...

Page 17: ...C401 1uF C404 1nF C405 1nF C406 22uF C408 47uF 16V D401 7 5V D402 7 5V D403 C5V6 Q401 2SC2412 SC401 CZ2107BM 21 F 0505CE C201 22pF L201 390mH R529 150 1 2W D404 7 5V D405 7 5V D406 7 5V D407 7 5V C205 1uF C508 330nF D803 C5V1 SF201 G1968M 5 4 3 1 2 C208 1uF C215 47uF 10V R515 100 C207 10uF 16V R416 47 R407 75 TQ R404 75 TQ R401 75 TQ C224 220nF D808 5V6 D810 6V8 R219 2K2 R220 100 L202 12uH DF R221...

Page 18: ...MZZ ZENER DIODE TZMC7V5 TFK SMD S AA AA D 0412 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD S AA AA D 0503 RH DX0503BMZZ DIODE 1N4933 S AB AB D 0505 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA AA D 0506 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA AA D 0601 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA AA D 0602 RH DX0505BMZZ DIODE 1N4935 S AB AE D 0603 RH DX0045BMZZ DIODE 1N4148 S AA AA D 0604 RH DX0506BMZZ DIODE ...

Page 19: ...No PARTS DESCRIPTION SN CODE EX CODE C 0703 RC KZ0029CEZZ CERAM C 10NF 80 20 250V S AC AC C 0704 RC KZ0029CEZZ CERAM C 10NF 80 20 250V S AC AC C 0705 RC EZ0140BMZZ ELEC C 47UF 400V TROBO S AC AK C 0707 VCEAGA1CW106M ELEC C 10UF 20 16V S AA AA C 0708 VCKYTV1HB153K CERAM C 15NF 50V 2125SMD S AA AA C 0709 RC KZ0160BMZZ CERAM C 2 2NF 4KV X1Y1 S AA AC C 0710 VCEAGA1EW227M ELEC C 220UF 20 25V S AA AA C ...

Page 20: ...D2R2J RES 2 2 OHM 5 1 2W S AA AA R 0610 VRD RA2HD270J RES 27 OHM 5 1 2W S AA AA REF No PARTS DESCRIPTION SN CODE EX CODE R 0611 VRD RA2HD270J RES 27 OHM 5 1 2W S AA AA R 0612 VRN VV3AB2R7J MET FILM R 2 7 OHM 5 1W S AA AA R 0613 VRD RA2BE153J RES 15KOHM 5 1 8W S AA AA R 0614 VRS TV1JD561J 2125 560 OHM 5 1 10W SMD S AA AA R 0615 RR XZ0212BMZZ FUS RES 10R TAP 5 1 2W S AA AB R 0616 RR XZ0242BMZZ FUS R...

Page 21: ...ITCH S AA AA S 1004 QSW K0079GEZZ TACTILE SWITCH S AA AA SC 0401 QSOCZ2107BMZZ SOCKET S AF AE PWB B SOCKET UNIT TRANSISTORS Q 0870 RH TX0181BMZZ TRT BF422 TOSHIBA S AA AC Q 0871 RH TX0181BMZZ TRT BF422 TOSHIBA S AA AC Q 0872 RH TX0181BMZZ TRT BF422 TOSHIBA S AA AC Q 0883 RH TX0180BMZZ TRT BF421 TOSHIBA S AA AB Q 0885 RH TX0180BMZZ TRT BF421 TOSHIBA S AA AB Q 0887 RH TX0180BMZZ TRT BF421 TOSHIBA S ...

Page 22: ...ET SET 37GQ21SESR RED S AR BC 1 2 HBDGB1017BMSB SHARP BADGE S AA AC 1 3 HDECQ0036BMSA R C DECORATION S AA AB 1 4 HDECQ0035BMSA LED DECORATION S AA AB 1 5 JBTN 1047BMSA UP DOWN BUTTON BLACK S AA AD 1 5 JBTN 1047BMSD UP DOWN BUTTON 37GQ20SDES METALLIC BLUE 026 S AA AE 1 5 JBTN 1047BMSC UP DOWN BUTTON YELLOW EM S AA AE 1 6 JBTN 1046BMSA POWER BUTTON BLACK S AA AB 1 6 JBTN 1046BMSD POWER BUTTON 37GQ20...

Page 23: ...eck Q1001 IC1001 IC1003 Check the tuner supply and band biases Both must be approx 5V DC Normal YES Is tuning voltage normal at Pin 2 of Tuner Check Picture setting by R C Signal should be received Check the AGC Voltage Pin 1 of Tuner Check the SAW Filter SF201 ...

Page 24: ...und setting by R C Signal should be received NO YES Check D707 C710 NO Is Audio Amplifier muted Check R304 Q301 Q302 NO Check IC801 C301 YES YES Check IC1001 Q305 Does Sound Signal appear at Pin 6 of IC801 Does approx 20V DC appear on C710 ...

Page 25: ...heck IC701 Normal Abnormal Check Q601 C711 Check D708 D717 Normal Check R705 R706 R715 D706 Normal Check CRT connector K1 K5 bias Normal Abnormal Check C878 Check IC801 Check Q601 C711 Check Voltage on C705 Approx 325V DC Check D701 D702 D703 D704 C705 Check Voltage on C711 Approx 105V DC Approx 0V ...

Page 26: ...E VERTICAL AMP AND VERTICAL LINEARITY Readjust Vertical Size Check D505 D506 Check Q505 Q507 Q509 NEITHER VERTICAL NOR HORIZONTAL SYNCHRONIZATION Check IC801 C815 C816 R818 Vertical size is abnormal Vertical linearity is abnormal Is IC501 bias normal Check R510 Q501 Q502 Q503 ...

Page 27: ...he White Balance The Picture Colour is Blue or Yellow The Picture Colour is green or magenta The Picture Colour is Red or cyan Check Q871 Q883 and their adjacent circuits Check Q870 Q885 and their adjacent circuits Check Q872 Q887 and their adjacent circuits UNLOCKED COLOUR NO COLOUR SYNCHRONIZATION Check setting of Colour Standard in Service Mode Normal Check IC801 C812 C813 R813 X801 ...

Page 28: ...22 37GQ 20FP RECICLED PAPER PRINTED BY ON ...

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