Sharp LL-T1820-B Service Manual Download Page 17

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PC-UM10M

LL-T1820-H/B TROUBLE SHOOTING

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Check DC+5V power supply line (AV5) ,
POWER_CTL1 signal, and circuits around
Q808.

Check DC+5V power supply line (PV5) ,
POWER_CTL3 signal, and circuits around
Q800.

Check the power supply unit and cable and
their connections, and POWER_CTL1

Check DC+2.5V power supply line (DV25),
POWER_CTL1 signal, and circuits around
IC800.

Check DC+12V power supply line (LCDV),
POWER_CTL2 signal, and circuits around
Q800.

Check OSC500 and clock circuit around
IC502.

Clock (R517) and DE (R515) signal outputs
are normal?

ADJUSTMENT and MODE SELECT are set
properly?

Signal waveform of test terminal LD510 is
normal?

ADJUSTMENT and MODE SELECT are set
properly?

Adjust according to "screen adjustment
procedure".

Check circuits around IC300, IC301, and
IC401.

Check circuits around IC701, and CN700
and LCD module.

Check DC+5V power supply line (DV5A),
POWER_CTL1 signal, and circuits around
Q808.

Test terminals LD419, LD515, and LD700 are
DC+3.3V?

Signal waveform of test terminal LD500 is
normal?

Test terminals LD416, LD417, and LD418 are
DC+3.3V?

8th pin of Q808 is DC+5V?

Test terminal LD809 is DC+5V?

Test terminal LD810 is DC+5V?

Test terminal LD807 is DC+12V?

Test terminal LD509 is DC+2.5V?

TP801 is DC+12.0V?

36th pin of LC601 is in H level (DC+5V)?

The entire LCD screen is white?

The entire LCD is black?

The size of LCD screen is abnormal?

LCD screen jitters or flickers?

Check circuits around IC400.

Check circuits around IC402.

Check circuits around IC601.

Test terminal of LD701 is DC+12V?

Check circuits around X600 and IC601.

Check circuits around IC501.

Check circuits around CN700.

Check circuits around IC401.

Check circuits around IC501.

Summary of Contents for LL-T1820-B

Page 1: ...d to be used for after sales service only The contents are subject to change without notice CODE 00ZLLT1820SME LCD MONITOR LL T1820 MODEL LL T1820 CHAPTER 1 OUTLINE OF THE PRODUCT NOMENCLATURE AND FUNCTION 1 1 CHAPTER 2 CONNECTION ADJUSTMENT OPERATION AND FUNCTIONS 2 1 CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3 1 CHAPTER 4 TROUBLE SHOOTING 4 1 CHAPTER 5 WAVE FORM 5 1 CHAPTER 6 BLOCK DIAGRAM 6 1 CHAPTER ...

Page 2: ...acteristics thermister Its resistance becomes high when heated by an overcurrent and shuts down the circuit similarly with a fuse When it is cooled down by non conduction its resistance returns to a low level and allows a current to flow through the circuit If a user erroneously allows an overcurrent to flow through an USB device the PTC101 cuts off the current When repaired it returns to normal N...

Page 3: ...lay to correct VGA SVGA XGA 1 1 expansion fixed aspect ratio expansion total screen surface Plug Play VESA DDC2B compatible Power management VESA based on DPMS DVI based on DMPM Input signal terminal Digital Analog 29 pin DVI I u 2 USB hub function 1 upstream port 2 downstream ports bus powered hub based on USB standard Rev 1 1 Screen tilt Upward 0 30 downward 0 5 Screen swivel 90 from left throug...

Page 4: ... 72Hz 50 0MHz 46 9kHz 75Hz 49 5MHz 1024 u 768 48 4kHz 60Hz 65 0MHz 56 5kHz 70Hz 75 0MHz 60 0kHz 75Hz 78 75MHz 1152 u 864 67 5kHz 75Hz 108 0MHz 1280 u 960 60 0kHz 60Hz 108 0MHz 1280 u 1024 64 0kHz 60Hz 108 0MHz 80 0kHz 75Hz 135 0MHz US text 720 u 400 31 5kHz 70Hz 28 3MHz Power Macintosh series 640 u 480 35 0kHz 66 7Hz 30 2MHz 832 u 624 49 7kHz 74 6Hz 57 3MHz 1024 u 768 60 2kHz 75Hz 80 0MHz 1152 u 8...

Page 5: ...Yes STANDBY Display off 2 9W No Yes SUSPEND Yes No OFF No No DPMS mode Screen Power consumption ON Display on 51W USB OFF 57W USB ON OFF Display off 2 9W Item MIN TYP MAX Unit Power supply voltage AC 90 100 110 V Working temperature range 5 35 C Storing temperature range 20 60 C Humidity range 20 85 RH Visual angle range Vertical CR u 10 m70 m85 Temperature Horizontal CR u 10 m70 m85 Temperature C...

Page 6: ...n in the clockwise direction to 90 To set to long width Gently turn in the counterclockwise direction to 90 Note The orientation of the display can be changed using Pivot Soft ware 8 USB port upstream 1 port 9 DVI I input terminal The computers digital RGB output terminal or analogue RGB output terminal can be con nected here For a digital signal input It can be connected to a computer with a DVI ...

Page 7: ...check while gently turning the display If it cannot be turned rehouse the cable with sufficient slack If there is insufficient cable length rotation will be impossible Forcing rotation may cause cable disconnection CONNECTING THE MONITOR TO A COMPUTER Connecting the monitor to a computer using the accessory signal cable This monitor has two input terminals to enable connection to two computers The...

Page 8: ...elkin ADC DVI adapter is con nected to ON Use the SELECT button to select INPUT1 or INPUT2 and use the e d buttons to select ON and OFF Do not set to ON if you are not using a Belkin ADC DVI adapter as this may result in incorrect display 4 Press the power button and turn off the monitor power This completes setting CONNECTING THE MONITOR TO A POWER SOURCE CONNECTING A USB DEVICE This monitor is e...

Page 9: ...sing the monitor for the first time or after having changed the sys tem settings during use perform an automatic screen adjustment When connecting to a notebook if the notebook computer s screen is set so that it is displaying at the same time the MS DOS screen may not be able to display properly In this case change the settings so that only the monitor is displaying CHANGING BETWEEN INPUT TERMINA...

Page 10: ...ace 3 Being careful not to damage the monitor gently lay the monitor on it display side down Caution Securely grasp both the display and stand and gently tip over When the monitor is inclined the stand may suddenly pop out and cause injury 4 Remove the four screws and then remove the stand from the moni tor Notes The stand is specially made for use with this monitor Once having removed the stand n...

Page 11: ...Press the two buttons at same time 4 Adjustment lock function While pressing the MENU button turn the power on 5 Automatic screen adjustment MENU ADJUSTMENT AUTO SELECT CLOCK SELECT PHASE SELECT H POS SELECT V POS SELECT GMMA SELECT HUE SELECT SATURATION MENU GAIN CONTROL AUTO SELECT BLACK LEVEL SELECT CONTRAST MENU COLOR CONTROL COLOR MODE sRGB STD VIVID COOL STD WHITE BALANCE WHITE BALANCE WARM ...

Page 12: ...close to it original image VIVID Displays an image with dynamic and VIVID pri mary colors WHITE BALANCE COOL STD WARM 5 levels USER R G B 0 100 WHITE BALANCE Menu COOL Color tone bluer than standard Color tone slightly bluer than standard STD Color tone standard setting Color tone slightly redder than standard WARM Color tone redder than standard USER R CONTRAST e button for blue green d button fo...

Page 13: ...e rear cabinet 3 2 Remove the seven screws C and remove the PWB shield 4 3 Remove the harnesses D F Remove the three screws E and remove the PWB 5 4 Remove the harnesses G H Remove the 18 screws and remove the main PWB 6 5 Remove the harness J Remove the five screws K and remove the power supply PWB 7 6 Remove the eight screws L and remove the angle 8 from the LCD unit 9 7 Remove the front cabinet...

Page 14: ...Remove the cover 3 3 Remove the six screws B and remove the 4 4 Remove one screw C and remove the cover 5 5 Remove the two screws D and remove the 6 6 Remove the two screws E and remove the 7 7 Pull the 9 out of the 8 8 Remove the two screws F and remove the F 9 Remove one screw G and remove the G 10 Remove the three screws H and remove the H 11 Remove the 17 screws and remove the I J and K ...

Page 15: ...08 Check DC 5V power supply line AV5 and POWER_CTL1 signal and circuits around 0808 Check MAINPW signal and areas around CN800 Remove the analog signal cable After a short while time the LED color changes form green to orange Yes Yes No No Yes Yes No No No No Yes Yes No No No No No Yes No Yes No Yes Yes No No No Perform 1 B L is lit No error Check AC cable connection Check power supply unit switch...

Page 16: ...over to the correct input signal port Check the power unit and cable and their connections and DC 12V power supply line Check BL_EN signal and circuits around CN801 Check BRT_VR signal and circuits around IC603 Signal waveforms of test terminals LD303 LD304 LD310 LD311 are normal Signal waveforms of test terminals LD305 LD306 LD312 LD313 are normal Signal waveforms of 31st and 32nd pins of IC401 a...

Page 17: ...t according to screen adjustment procedure Adjust according to screen adjustment procedure Check circuits around IC300 IC301 and IC401 Check circuits around IC701 and CN700 and LCD module Check DC 5V power supply line DV5A POWER_CTL1 signal and circuits around Q808 Test terminals LD419 LD515 and LD700 are DC 3 3V Signal waveform of test terminal LD500 is normal Test terminals LD416 LD417 and LD418...

Page 18: ...ustment settings are stored after display screen is adjusted AUTO function of GAIN CONTROL operates properly Input signal port is the one to which digital signal cable is connected Waveforms of IC103s and 201s 5th and 6th pins change normally when resolution is changed Test terminals LD100 LD101 LD200 LD201 LD202 LD203 LD204 LD205 are DC 3 3V CN100 and 200 signals at 1st 2nd 9th 10th 17th 18th 23r...

Page 19: ...play screen Arbitrary 1V DIV 50ns DIV WAVE FORM3 VSYNC LD304 Frequency 75Hz Display screen Arbitrary 1V DIV 5s DIV Wave form No Measurement point Name of waveform Display pattern 1 LD500 REFCK Arbitrary 2 IC601 of 2PIN XTAL Arbitrary 3 LD304 VSYNC Arbitrary 4 LD303 HSYNC Arbitrary 5 LD510 ICK Arbitrary 6 LD512 VS Arbitrary 7 LD513 IHS Arbitrary 8 IC701 of 10PIN DCLK Arbitrary 9 IC701 of 9PIN DEN A...

Page 20: ...lay screen Arbitrary 1V DIV 5µs DIV WAVE FORM5 ICK LD510 Frequency 67 5MHz Display screen Arbitrary 1V DIV 5s DIV WAVE FORM6 VS LD512 Frequency 75Hz Display screen Arbitrary 1V DIV 5s DIV WAVE FORM7 IHS LD513 Frequency 80kHz Display screen Arbitrary 1V DIV 5µs DIV GND GND GND GND ...

Page 21: ...IC701 Frequency 60MHz Display screen Arbitrary 1V DIV 5ns DIV WAVE FORM9 DEN 9pin of the IC701 Frequency 80kHz Display screen Arbitrary 1V DIV 5µs DIV WAVE FORM10 RGBOUT LD300 LD301 LD302 Display screen 16 monochromatic gradation patterns 0 5V DIV 5µs DIV GND GND GND ...

Page 22: ...í LED KEY Regulator PQ1CZ21H2Z IC800 2 5V 5V 3 3V V33 PV5 POWER_CTL Logic IC504 VS CN700 CN600 CN801 CN800 SW100 IACT IHS IVS OSC500 60MHz D DDC IC104 A DDC IC103 Selector IC200 A DDC IC201 D DDC IC202 PDO1 SDET1 PD1 IHS IVS ID 0 47 PDO2 SDET2 PD2 ID 0 47 IACT ID 0 47 IHS IVS ICK ICK COMSYN ICK Clock Generator IC502 DEN DCLK OD 0 47 LCD Panel Lamp Lamp DV25 AV5 DV5 PV33 AV33 DV33 OV33 AD33 LV33 3 ...

Page 23: ...10M LL T1820 H B CIRCUIT DIAGRAM 7 1 A B C D 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 D C B A A B C D 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 D C B A A B C D 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 D C B A CHAPTER 7 CIRCUIT DIAGRAM ...

Page 24: ...21 QO22 OGND QO23 OVCC AGND RX2 RX2 AVCC AGND AVCC RX1 RX1 AGND AVCC AGND RX0 RX0 AGND RXC RXC AVCC EXT_RES PVCC PGND RESERVED OCK_INV S_D PD ST PIXS M_S GND VCC STAG_OUT SYNC SCDT PDO QE0 QE1 QE2 QE3 QE4 QE5 QE6 QE7 OVCC OGND QE8 QE9 QE10 QE11 QE12 QE13 QE14 QE15 OGND OVCC QE16 QE17 QE18 QE19 QE20 QE21 QE22 QE23 VCC GND CTL1 CTL2 CTL3 OVCC ODCK OGND DE VSYNC HSYNC INPUT 1 DVI1 DV5 OV33_1 AV33_1 D...

Page 25: ...6 QE17 QE18 QE19 QE20 QE21 QE22 QE23 VCC GND CTL1 CTL2 CTL3 OVCC ODCK OGND DE VSYNC HSYNC A0 A1 A2 GND SDA SCL WP VCC 2Y1 2Y0 3Y1 3 COM 3Y0 INH GND GND VCC 2 COM 1 COM 1Y1 1Y0 A B C ADJ OUTPUT INPUT RX2 RX2 RX4 RX4 SCL SDA RX1 RX1 RX3 RX3 HP RX0 RX0 RX5 RX5 RXC RXC GND GND GND GND GND VS 5V ARED AGREEN ABLUE AHSY ANGND A0 A1 A2 GND SDA SCL WP VCC INPUT 2 DVI2 OV33_2 OV33_2 DV33_2 PV33_2 DV33_2 OV3...

Page 26: ...01 2SA1610 R365 R362 C322 C314 C325 R307 C332 R314 FB305 C302 C330 D307 DAN217U R364 LD308 C324 R383 Q309 EMPTY FMG8A LD304 R355 C326 R354 LD302 R350 ANALOG INPUT DV5 AV5 AV5 DV5 AV5 AV5 AV5 AD33 0 1uF 4 7kJ EMPTY MMZ1608D301B 10kJ 3 2 1 1 2 3 4 5 33pF 680F 10uF 330J 10kJ 0 047uF B 1000pF B 3 2 1 10kJ 150J 1 2 3 4 5 270J 10uF 2 2kF 270J 10kJ 10uF MMZ1608D301B 150J 1 2 3 4 5 3 2 1 10uF 10kJ 0 047uF...

Page 27: ...51 LD418 IC403 S1L50753F26P C432 LD410 C422 RA411 33J x4 C428 C420 C430 C418 C407 RA407 33J x4 C444 C408 RA400 33J x4 LD407 C403 C440 C450 LD415 C436 FB403 BLM11P600S RA401 33J x4 C437 C411 C442 C448 R405 R416 C417 LD411 RA409 33J x4 R404 R403 RA403 33J x4 R412 LD406 LD413 C446 LD416 LD400 C413 IC400 LM317EMP ADC DV5A PV5 LV33 AD33 0 1uF 0 1uF EMPTY 0 1uF 0 1uF 10uF 3900pF B 220F 360F EMPTY 0 1uF ...

Page 28: ...C526 C546 LD511 C533 TP535 C503 LD509 RA502 33J x4 C507 TP504 C542 RA509 33J x4 C531 TP548 R509 TP545 TP523 TP507 TP528 C506 TP527 TP512 TP518 TP511 IC501 iLS L001 C500 TP541 RA500 33J x4 C515 TP542 LD512 C524 R515 C539 IC504 TC74LCX74FT TP549 C547 RA511 33J x4 C519 C529 RA506 33J x4 LD501 RA501 33J x4 TP514 TP500 C543 TP534 C518 TP547 TP521 TP503 TP530 R517 C505 C537 R510 C523 TP519 LD513 LD502 W...

Page 29: ...5 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 47kJ 0 1uF 47kJ EMPTY 1 2 3 4 5 2 3 1 10uF 47kJ 2 2kF 0 1uF 100J x6 EMPTY 10uF 1 2 3 4 5 6 7 8 1000pF 0 1uF 100J 220F 47kJ 47kJ 10pF CH 1 2 3 47kJ 330J EMPTY BLM11A121S x6 ASIC_CS L001_CS SDA SCL BL_EN POWER_CTL1 POWER_CTL2 TMDS_PDO1 TMDS_PD1 LVDS_PD PLL_EN TMDS_PDO2 TMDS_PD2 HPOL VPOL SO TXD RXD MD1 VS_IN HS_IN TMDS_SDET...

Page 30: ...CC GND GND RAIN0 RAIN0 GND RAIN1 RAIN1 RAIN2 RAIN2 RACLKIN RACLKIN RAIN3 RAIN3 VCC GND NC NC GND RBIN3 RBIN3 RBCLKIN RBCLKIN RBIN2 RBIN2 RBIN1 RBN1 RBIN0 RBIN0 B15 B16 B17 R20 R21 R22 R23 R24 R25 R26 R27 VCC GND G20 G21 G22 G23 G24 G25 G26 G27 B20 B21 B22 B23 B24 B25 VCC GND B26 B27 HSYNC VSYNC DE CLKIN R F RS TEST1 TEST2 MODE1 MODE0 OE 6 8 PDWN TEST3 TEST4 TEST5 PLL GND PLL VCC PLL GND LVDS GND T...

Page 31: ...C817 LD801 LD804 LD808 TP801 LD810 C814 47uF 16V WX C804 Q803 DTC143EE C809 470uF 16V UR L802 CDRH73 10uH TP802 FB802 BLM41P600S LD802 Q802 DTC143EE CN801 B7B PH SM3 TBT L803 CDRH127 220uH C803 47uF 16V WX L805 NLC322522T 220K Q806 DTC143EE C802 47uF 16V WX LD803 FB801 BLM41P600S Q805 DTC143EE R803 C811 C815 D800 UDZS5 6B D801 SFPB76 R816 LD805 0V MAX R816 SOME I F USE DIP TYPE REGISTER POWER DV25...

Page 32: ... C7 15p D3 DAN217U 1 3 2 C8 15p D2 DAN217U 1 3 2 PC1 0 1u D4 DAN217U 1 3 2 C204 33u 10V IC3 UPD72012 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 31 32 33 34 35 36 37 38 39 40 41 42 43 44 DGND DGND D40 D41 D50 D51 DGND OSL AVDD1 X2 X1 AGND1 AGND2 AVDD2 DVDD DVDD DGND PSSEL PVSEL DGND XRST UDO UD1 D10 D11 DGND D20 D21 D30 D31 DGND XCS1 XCS2 XCS3 XCS4 XCS5 CLKSEL ...

Page 33: ...PC UM10M LL T1820 H B PARTS LAYOUT 8 1 CHAPTER 8 PARTS LAYOUT POWER BOARD ...

Page 34: ...PC UM10M LL T1820 H B PARTS LAYOUT 8 2 MAIN BOARD ...

Page 35: ...PC UM10M LL T1820 H B PARTS LAYOUT 8 3 MAIN BOARD USB BOARD ...

Page 36: ...2 December Printed in Japan t COPYRIGHT 2002 BY SHARP CORPORATION All rights reserved Printed in Japan No part of this publication may be reproduced stored in a retrieval system or transmitted In any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher ...

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