Sharp LL-T2020 Service Manual
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Sharp LL-T2020 Service Manual

Sharp LL-T2020 Service Manual

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Download this manual See also: Operating Manual
CHAPTER 1. OUTLINE OF THE PRODUCT,
CHAPTER 3. DISASSEMBLY AND ASSEMBLY . . . . . . . . . . . . . . . . . . . .3 - 1
CHAPTER 4. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1
CHAPTER 5. WAVE FORM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1
CHAPTER 6. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1
CHAPTER 7. CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 - 1
CHAPTER 8. PARTS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1

Parts marked with "
" are important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.

SERVICE MANUAL

CONTENTS
NOMENCLATURE AND FUNCTION . . . . . . . . . . . . . . . . . .1 - 1
OPERATION, AND FUNCTIONS. . . . . . . . . . . . . . . . . . . . .2 - 1
SHARP CORPORATION
CODE : 00Z

LCD MONITOR

LL-T2020
MODEL
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
LLT2020SME

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Summary of Contents for Sharp LL-T2020

  • Page 1: Table Of Contents

    SERVICE MANUAL CODE : 00Z LLT2020SME LCD MONITOR LL-T2020 MODEL CONTENTS CHAPTER 1. OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION ....1 - 1 CHAPTER 2.

  • Page 2: Nomenclature And Function

    • Analog signal cable, NL-C02E (purchased separately): Approx. 2.0m • Screen tilt Upward approx. 0 - 30° ; downward approx. 0 - 5° • 2-input cable, NL-C03J (purchased separately): Approx. 0.25m LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 1...
  • Page 3 11 TMDS data 1/3 shield C2 Analogue green image signal 12 N.C. C3 Analogue blue image signal 13 N.C. C4 Analogue horizontally synchronised signal 14 +5V C5 Analogue GND 15 GND LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 2...

  • Page 4: Product Description

    11. Power terminal 12. Main power switch 13. Ventilation openings Note: Never block the ventilation openings as this may lead to overheating inside the monitor and result in malfunction. LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 3...
  • Page 5 To set to long width approx. 45 approx. 5 Gently turn in the counterclockwise direction (to 90°). approx. 45 Note: The orientation of the display can be changed using Pivot Soft- ware. LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 4...

  • Page 6: Chapter 2. Connection, Adjustment

    Analog signal cable Analog RGB output terminal • Paying attention to connector direction, firmly insert the signal cable to terminal, and then tighten the screws at both sides. LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 1...
  • Page 7 • Do not set to [ON] if you are not using a Belkin ADC-DVI adapter, as this may result in incorrect display. AC outlet 4. Press the power button, and turn off the monitor power. Power cord This completes setting. LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 2...
  • Page 8 (analog) (digital) 2. Press the monitor's POWER button. The power LED will light up orange. INPUT INPUT-2-A INPUT-2-D <ANALOG> <DIGITAL> Note: When there is no input signal, [NO SIGNAL] is displayed. LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 3...
  • Page 9 Securely grasp both the display and stand, and gently tip over. 6~8mm When the monitor is inclined, the stand may suddenly pop out and cause injury. Screw used to attach arm Part of monitor to which arm is attached LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 4...
  • Page 10 PIVOT] on the [MODE SELECT-2] menu. 7. Drag the [MacPortrait Install] icon onto the desired disk. Installation will begin. 8. When the message indicating installation is finished is displayed, click on [Restart]. LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 5...

  • Page 11: Adjustment Method

    INPUT-2 (Adjust with MENU MODE SELECT-2 OSD H-POSITION (Adjust with OSD V-POSITION OSD PIVOT (Adjust with MENU MENU (Select with LANGUAGE MENU (Adjust with SCALING (Adjust with 400 LINES (Analog only) LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 6...
  • Page 12 You can specify the horizontal resolution of a 400-line screen when using US text, etc.( buttons) 640: 640 400 dot mode 720: 720 400 dot mode (US text etc.) Select the item 0~31 Adjusting the backlight POWER ON, OFF LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 7...

  • Page 13: Chapter 3. Disassembly And Assembly

    12) Remove the board angles ( 13) Remove the connector from the LCD unit 14) Remove the screw . Remove the key switch angle 15) Remove the key unit and then remove the connector LL-T2020 DISASSEMBLY AND ASSEMBLY 3 – 1...
  • Page 14 11) Remove the screw and then remove the hinge covers ( ) from the hinge unit 12) Remove the screw and then remove the stand base plates ( from the stand cover LL-T2020 DISASSEMBLY AND ASSEMBLY 3 – 2...

  • Page 15: Chapter 4. Troubleshooting

    CN601, SW PWB and cable. (Yes) 4th pin of IC602 is in H level (DC+5 V)? (No) Check RESET circuit around IC602. (Yes) C610-side terminal signal of X601 is normal? (No) Check IC602 and clock circuit around X601. (Yes) LL-T2020 TROUBLESHOOTING 4 – 1...
  • Page 16 PWB unit is about 790 Vrms? (Use caution not to get electric shock accident. Use (No) Replace inverter PWB unit with a new one. a high-voltage probe (more than 100:1) for measuring voltage.) (Yes) Check lamp inside LCD module. LL-T2020 TROUBLESHOOTING 4 – 2...
  • Page 17 (Yes) Check circuits around IC502. ADJUSTMENT and MODE SELECT are set Adjust according to "screen adjustment LCD screen jitters or flickers? (Yes) (No) properly? procedure". (No) (Yes) Check circuits around IC301, IC302, and IC402. LL-T2020 TROUBLESHOOTING 4 – 3...
  • Page 18 17th, 18th, 23rd, and 24th pins) are normal? and digital signal cable. (Yes) IC102 and IC202 signal output (ID0 ID47, (No) Check circuits around IC102 and IC202. HIS, IVS, ICK, IACT) are normal? (Yes) Check circuits around IC502. LL-T2020 TROUBLESHOOTING 4 – 4...

  • Page 19: Chapter 5. Wave Form

    Display screen: Arbitrary DOTCLK: 162MHz 1V/DIV, 5ms/DIV WAVE FORM 1: REFCK (LD565) Frequency: 81MHz Display screen: Arbitrary 2V/DIV, 10ns/DIV WAVE FORM 4: HSYNC (LD304, LD317) Frequency: 75kHz Display screen: Arbitrary 1V/DIV, 5µ µ µ µ s/DIV LL-T2020 WAVE FORM 5 – 1...
  • Page 20 WAVE FORM 10: RGB OUT ( LD300, LD301, LD302) Display screen: 16 monochromatic gradation patterns WAVE FORM 7: IHS (LD505) 0.5V/DIV, 5µ µ µ µ s/DIV Frequency: 75kHz Display screen: Arbitrary 1V/DIV, 5µ µ µ µ s/DIV LL-T2020 WAVE FORM 5 – 2...

  • Page 21: Chapter 6. Block Diagram

    CHAPTER 6. BLOCK DIAGRAM CN803 CN801 CN802 Regulator Regulator LM317 PV33/AV33/DV33/ PQ1CY1032Z DV5A 3.3V IC104/203/401 OV33/AD33 IC801 Invertor Unit Power Unit Regulator LM317 3.3V IC601 Regulator LM317 Regulator 3.3V LV33 PQ 20WZ11 LCDV IC403 BL_EN IC803 Regulator MAIN P WB PQ1CZ21H2Z 2.5V DV25...

  • Page 22: Chapter 7. Circuit Diagram

    CHAPTER 7. CIRCUIT DIAGRAM POWER SUPPLY PWB...
  • Page 23 DVI1 LD101 CN101 RX2- RX2+ SW101 D101 SSSS916900 RB715F RX4- RX4+ R101 RX1- 4.7kJ RX1+ D102 D103 FB101 UDZS5.6B UDZS5.6B RX3- BLM18PG600SN1 RX3+ R102 47kJ R103 10kJ R104 R105 R106 RX0- OV33_1 DV33_1 RX0+ RX5- RX5+ IC101 R107 R108 FST3257 RXC+ C101 C108...
  • Page 24 DVI2 LD201 CN201 RX2- RX2+ R201 D201 4.7kJ RB715F RX4- RX4+ RX1- RX1+ FB201 RX3- BLM18PG600SN1 RX3+ R202 10kJ D202 D203 R203 R204 R205 UDZS5.6B UDZS5.6B RX0- OV33_2 DV33_2 RX0+ RX5- RX5+ RXC+ C201 C208 RXC- 0.1uF 0.1uF RED2 ARED AGREEN GREEN2 C202...

  • Page 25: Analog Input

    ANALOG INPUT C301 D301 D302 D303 D304 D305 0.1uF R301 R302 DAN217U DAN217U DAN217U DAN217U DAN217U 10kJ 270J R303 FB301 C302 180J MMZ1608D30 1 B 0.047uF(B) RIN1 Q301 2SA1610 R306 C303 LD301 LD302 LD303 LD304 LD305 150J 1000pF(B) SOG1 C304 R304 R305 LD307...
  • Page 26 R401 ENPTY FB401 BLM18PG600SN1 R402 C401 EMPTY ID[0..47] R416 R403 EMPTY R404 10J RA401 33J x4 ICK1 R405 33J IC401 C402 R406 33J RA402 33J x4 COMSYN 33pF LM317EMP R407 33J LD401 LD402 LD403 DV5A RA403 33J x4 ID24 ID25 ID26 C405 FB402...
  • Page 27 West Umeda LD502 LD503 LD504 LD505 LD506 DV25 FB501 LD501 BLM18PG600SN1 C501 10uF C502 10uF ID[0..47] IACT LD507 LD508 COMSYN C503 10pF(CH) C504 ID10 0.1uF ID11 SCLK X501 ID12 SMD-49(24.00 M Hz) ID13 ID14 LD521 ID15 L001_CS LD522 C505 C506 C507 C508 C509...
  • Page 28 XCLDWN SCLK_X DATA_X STROBE_X LD601 LD602 LD603 LD604 IC601 LM317EMP LD605 LD606 LD607 CL33 C603 FB601 LD608 100uF/16V(WT) BLM18PG600SN1 LD609 INP2B C601 C602 INP2A 0.1uF 10uF C604 INP1B R601 D601 10uF C605 INP1A R602 220F UDZS5.6B 10uF 360F Q601 BL_EN IMH4A R603 100J SCLK...
  • Page 29 LVDS LD701 LV33 FB701 LD702 BLM18PG600SN1 C701 10uF OD[0..47] OD24 OD25 OD26 OD27 OD28 OD29 OD30 OD31 OD32 OD33 OD34 OD35 OD36 OD37 OD38 OD39 OD40 OD41 OD42 OD43 C702 OD44 EMPTY(22uF/16V(WT)) R701 RACLKIN- LCDV C703 C704 R702 RACLKIN+ 0.1uF 0.1uF 150uF/25V(WT) CN701...
  • Page 30 POWER LD807 LD808 LD809 LD810 CN802 B7B-PH-SM3-TBT D806 DAN202U LCDV R801 R802 4.7kJ 4.7kJ F804 LD816 Q802 Q803 FB804 S1.8 C826 DTC143EE DTC143EE BLM41PG600SN1 D807 BL_EN IC803 R812 LD801 LD803 PTZ13B 7.87kF 47uF/16V(WT) VOUT C806 D802 C807 R806 C827 0.1uF UDZS5.6B 2.2uF/35V(WT) LD804...

  • Page 31: Chapter 8. Parts Layout

    CHAPTER 8. PARTS LAYOUT MAIN PWB...
  • Page 33 POWER SUPPLY PWB...

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