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Diamond View DV172 Service Manual

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Diamond View LCD Monitor
DV172 / DV172B
(B=Black Cosmetic)
Service Guide
February 2003
Distributed by
Mitsubishi Electric Australia Pty. Ltd.
A.B.N. 58 001 215 792
348 Victoria Road
RYDALMERE NSW 2116
Australia
Telephone 1300 605 808

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  • Page 1 Diamond View LCD Monitor DV172 / DV172B (B=Black Cosmetic) Service Guide February 2003 Distributed by Mitsubishi Electric Australia Pty. Ltd. A.B.N. 58 001 215 792 348 Victoria Road RYDALMERE NSW 2116 Australia Telephone 1300 605 808...
  • Page 2 Copyright Copyright ã 1996 by the Company. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of the Company.
  • Page 3 Diamond View LCD Monitor DV172 / DV172B (B = Black Cosmetic’s) Manual Contents Section Engineering Specifications Circuit Operation Theory Alignment procedure Trouble Shooting Parts Lists (DV172 & DV172B) Schematic Diagrams Assembly...

  • Page 4: Table Of Contents

    DV172 LCD Monitor Service Guide Engineering Specification Table of Contents 1. INTRODUCTION ...........................2 2. ELECTRICAL CHARACTERISTICS ....................3 2.1 P ............................3 OWER SUPPLY 2.2 S ..........................3 IGNAL INTERFACE 2.3 V ...........................5 IDEO PERFORMANCE 2.4 S ............................5 CAN RANGE 2.5 P & P DDC2B S ......................5...

  • Page 5: Introduction

    Engineering Specification 1. Introduction This specification describes DV172, a 17.0” dual interface color TFT LCD monitor with speakers supported. The display supports up to 1280x1024/75Hz resolution & refresh rate and 262144 colors with dithering. The features summary is as below,...

  • Page 6: Electrical Characteristics

    DV172 LCD Monitor Service Guide Engineering Specification 2. Electrical Characteristics 2.1 Power supply Item Condition Spec OK N.A Remark Input Voltage range Universal input full range 90~264VAC /47~63Hz √ √ Input Current range 90 ~ 264VAC < 2.0 Arms √...
  • Page 7 DV172 LCD Monitor Service Guide Engineering Specification Signal Assignment Signal Assignment Red video PC5V (+5 volt power) Green video Sync Ground Blue video Ground Ground Ground H-Sync (or H+V) Red Ground V-sync Green Ground Blue Ground Note-2: The pin assignment of 24 pins DVI connector: (C1 ~ C5 are NC)

  • Page 8: Video Performance

    DV172 LCD Monitor Service Guide Engineering Specification 2.3 Video performance Item Condition Spec OK N.A Remark 135 MHz √ Max. support Pixel rate 1280 x 1024 √ Max. Resolution < 3.7 ns √ 1280x1024 @ 75Hz Rise time + Fall time (50% of minimum pixel (max.

  • Page 9: Operational & Functional Specification

    DV172 LCD Monitor Service Guide Engineering Specification Actual Output Input Timing Horizontal Vertical Dot Clock Actual display OK N.A Remark Resolution Frequency (KHz) Frequency (Hz) Frequency (MHz) Resolution √ 1024X768 60.24(N) 74.93(N) 80.00 1280x1024 Macintosh √ 1152x864 67.50(P) 75.00(P) 108.00...

  • Page 10: Audio Performance

    DV172 LCD Monitor Service Guide Engineering Specification 3.4 Audio performance Item Condition Spec OK N.A Remark Preamp + Power amp √ (1)Output power 1 Wrms/CH @ 1KHz Real output √ (2)THD (@ 1W) <10% √ (3)S/N ratio 40dB Speaker Driver...

  • Page 11: User Controls

    DV172 LCD Monitor Service Guide Engineering Specification 5. User Controls 5.1 User’s hardware control definition: Item Condition Spec OK N. Remark √ Monitor Power button √ Enter button √ ¡ ¶ /Inc. button √ ¡ ¿ /Dec. button √ Exit button √...

  • Page 12: Mechanical Characteristics

    DV172 LCD Monitor Service Guide Engineering Specification 6. Mechanical Characteristics 6.1 Dimension Item Condition Spec OK N. Remark Bezel opening 340x272.4 mm √ Refer to Table 6 √ Monitor without Stand L x W x H mm 382.7x118x402.85 mm √...
  • Page 13 DV172 LCD Monitor Service Guide Engineering Specification √ TCO92/95 TCO99 √ PC-Monitor Microsoft Windows PC98/99 √ DPMS VESA √ DDC 2B Version 1.3 √ External √ Safety UL (USA) UL 1950 3 edition √ √ CSA (Canada) C22.2 No. 950-M95 √...

  • Page 14: Appendix: Physical Dimension Front View And Side View

    DV172 LCD Monitor Service Guide Engineering Specification Appendix: Physical Dimension Front View and Side view 382. 7 340. 0 78. 5 272. 4 357. 5...

  • Page 15: Circuit Operation Theory

    II. Block diagram DV172 consists of a head and a stand (base). The head consists of a LCD module with 4 lamps, a power board (include AC-DC, inverter power & audio circuit), a control board and an interface board. The block diagram is shown as below.
  • Page 16 DSCL DSDA (a) Circuit operation theory: (The scaling IC used in DV172 is Genesis gm5120) A basic operation theory for this interface board in Analog input signals processing, the scaling IC inside A/D converter will convert analog input signals of Red, Green and Blue to 8 bits digital signals of Red, Green and Blue, and for interface board in DVI-D(TMDS) digital input signals processing, the scaling IC inside TMDS receiver will convert TMDS signals to 8 bits digital signals of Red, Green and Blue.
  • Page 17 DV172 LCD Monitor Service Guide Circuit Operation Theory data, we also call it, DDC IC, and another is to store OSD common data and those picture controlled and data. Flash-Rom is to store the source code which will be accessed by the scaling IC inside MCU to run program.
  • Page 18 DV172 LCD Monitor Service Guide Circuit Operation Theory (a) EMI Filter This circuit (fig. 2) is designed to inhibit electrical and magnetic interference for meeting FCC, VDE, VCCI standard requirements. Fig. 2 (b) Rectifier and filter AC Voltage (90-264V) is rectified and filtered by BD601, C605 (See Fig 3) and the DC Output voltage is 1.4*(AC input).
  • Page 19 DV172 LCD Monitor Service Guide Circuit Operation Theory Fig. 4 (d) Rectifier and filter D701 and C703 are to produce DC output. L701 and C704 are to suppress high Frequency switching spikes. (See Fig.5) Fig. 5 (e) PWM Controller The current mode control IC UC3842B is used to control PWM. When the VCC terminal of it gets 16V, IC601 turns on.
  • Page 20 DV172 LCD Monitor Service Guide Circuit Operation Theory Fig. 6 (f) Feedback circuit PC123 is a photo-coupler and TL431 is a shunt regulation. They are used to detect the output voltage change and be the primary and secondary isolation. When output voltage changes, the feedback voltage will be compared and duty cycle will be decided to control the correct output voltage.
  • Page 21 DV172 LCD Monitor Service Guide Circuit Operation Theory (g) Audio circuit: Connect with PC Audio output DC POWER AUDIO Connect with INPUT INPUT 8 ohm/2W Speaker POWER IC TDA7496 The Audio circuit is in Power board. The Audio Speaker has DC Volume control, use 28mmX40mm Speaker (2W per channel), power supply from AC-DC board and Audio input from PC Audio output (Line Out).
  • Page 22 DV172 LCD Monitor Service Guide Circuit Operation Theory...
  • Page 23 DV172 LCD Monitor Service Guide Circuit Operation Theory (h) Inverter circuit: 1.) Block Diagram: ON/OFF OSCILATOR TRANSFORMER CCFL 15Vin switching CIRCUIT ON/OFF PWM CONTROLLER PROTECTION TL1451 CIRCUIT AND DETECT BRT_ADJ 2.) General Specification Input Voltage: 15V Input Current: 2A max.
  • Page 24 DV172 LCD Monitor Service Guide Circuit Operation Theory 3.)Circuit Operation Theorem 3.1) ON/OFF SWITCH The turn-on voltage was controlled by R756 and R757.The inverter was turned on or off by the switching transistors Q761 and Q757, Also regulator IC751 is control by Q761 and Q757 decide...
  • Page 25 DV172 LCD Monitor Service Guide Circuit Operation Theory 3.2) PWM Control circuit TL1451 is a dual PWM controller.C765 and R765 decide the working frequency.BLT_ADJ signal is from control board, control pulse width then decide how much energy delivery to CCFL also decide CCFL brightness.
  • Page 26 DV172 LCD Monitor Service Guide Circuit Operation Theory 3.3) Oscillator Circuit Royer circuit uses the characteristic of transformer saturation to oscillate. When the DC power inject, Q759 or Q760 will turns on, and the current Ic increases. After a period, the transistor will leave the saturation status and Vce increase.
  • Page 27 DV172 LCD Monitor Service Guide Alignment procedure Table of Contents 1. Alignment procedure (for function adjustment)................2 A. Preparation: ........................2 B. Timing adjustment: (Analog only, it’s no need for DVI-D input source) ......2 C. Auto color balance adjustment: (Analog only, it’s no need for DVI-D input source) ..2 D.

  • Page 28: Alignment Procedure (For Function Adjustment)

    DV172 LCD Monitor Service Guide Alignment procedure 1. Alignment procedure (for function adjustment) The list of necessary alignment for a LCD monitor: Items Description Remark Timing adjustment Preset timing Auto color balance adjustment SVGA2 60Hz Color temperature adjustment C1, C2 & C3...

  • Page 29: Writing Edid File: (Analog And Dvi-D Both)

    DV172 LCD Monitor Service Guide Alignment procedure 2. Enter factory mode (press “EXIT” & “ENTER” at the same time, then press “power” button to turn on monitor). 3. Confirm auto color balance adjustment had already been done. 4. Measure each color temperature (C1, C2 & C3) by Minolta CA-110 (or equivalent equipment).

  • Page 30: Wire Dressing

    DV172 LCD Monitor Service Guide Alignment procedure The Table is for alignment machine to read data from EEPROM to check if the alignment process and write data are correct. I2C Send Command Byte1 Byte2 Byte3 Byte4 Read EEPROM Contrast checksum...
  • Page 31 DV172 LCD Monitor Service Guide Alignment procedure b.) Speaker wire...
  • Page 32 DV172 LCD Monitor Service Guide Alignment procedure c.) LVDS wire d.) Power grounding...

  • Page 33: Add Glue

    DV172 LCD Monitor Service Guide Alignment procedure e.) Control wire 3. Add Glue The below attached figure shows the location of added glue component. a.)The location of add glue component have L602, L603, C605, C603, C604, C615, C703, C704, and C707.

  • Page 34: Touch Up

    DV172 LCD Monitor Service Guide Alignment procedure 4.Touch Up Remark: The manufacturing site should base on their experience and pass the necessary testing to add or reduce some touchup points.

  • Page 35: Trouble Shooting

    DV172 LCD Monitor Service Guide Trouble Shooting 1. No Display or display is unstable: 1.1 Interface Board: No picture or picture unstable Power off? Turn On Power Cables used in DV172: Internal: (a)LVDS wire to panel:J6 & J7 Plug all wire then turn on...
  • Page 36 DV172 LCD Monitor Service Guide Trouble Shooting 2.1 Control Board OSD is not working Is control BD connecting? Plug control BD then retry Is bottom switch normally? Replace control BD then retry Replace Control BD Is OSD working?? Check Interface BD...
  • Page 37 DV172 LCD Monitor Service Guide Trouble Shooting 3. OSD function: OSD doesn’t work Is control BD working? Replace control BD Check interface BD...

  • Page 38: Power Board

    DV172 LCD Monitor Service Guide Trouble Shooting 4.Power Board Backlight didn' t shine Replace Q 7 61 IC751 PIN 9 IS 15V? LED shined ? Plug CN701 again or PWM existed? 3.3V existed ? IS I/F board connected? checking I/F BD...
  • Page 39 Model: DV172 No. PART NO. DESCRIPTION LOCATION 1 55.L5301.021 PCBA I/F BD MAXDATA 2 09.10612.01B CAPACITOR EL 10U 25V M RF2.5 3 09.22612.01B CAP EL 22U 25V M RF2.5 3 09.22612.01B CAP EL 22U 25V M RF2.5 4 09.47612.01V CAP EL 47U 25V M RT2.5 5 20.22003.024...
  • Page 40 CORD SAA #18*3C 10A 250V AUS 83 42.20019.002 BAG PE 250*350 LD 84 42.L0811.002 PE-HD BAG 600*650*0.05T 24LNG 85 44.L4001.131 CTN B DIAMOND(DV172) 86 45.00050.002 LABEL CTN ART 105*82 ALL(KB) 87 46.L0301.001 CARD WARR TFT LCD 88 47.L5301.002 CSN L EPS 89 47.L5302.002...
  • Page 41 94 53.L5304.001 F DISK MEA DV172...
  • Page 42 Model: DV172B (B = Black Cosmetic’s) PART NO. DESCRIPTION LOCATION ============ ============================== ===================================== 1 55.L5301.021 PCBA I/F BD MAXDATA 2 09.10612.01B CAPACITOR EL 10U 25V M RF2.5 3 09.22612.01B CAP EL 22U 25V M RF2.5 3 09.22612.01B CAP EL 22U 25V M RF2.5 4 09.47612.01V CAP EL 47U 25V M RT2.5 5 20.22003.024...
  • Page 43 83 27.01318.081 CORD 3ASL10A250V1800MMAUS W/S 84 42.20019.002 BAG PE 250*350 LD 85 42.L0811.002 PE-HD BAG 600*650*0.05T 24LNG 86 44.L4001.131 CTN B DIAMOND(DV172) 87 45.00050.002 LABEL CTN ART 105*82 ALL(KB) 88 45.75801.021 LBL BLACK 100*50 DIAMOND 89 46.L0301.001 CARD WARR TFT LCD...
  • Page 44 90 47.L5301.002 CSN L EPS 91 47.L5302.002 CSN R EPS 92 49.L5303.001 INSTRUCTION MANUAL DV172 93 50.74405.201 CABLE AUDIO 284C/577C 002 140 94 50.L2308.501 SIGNAL/C 15/15P W/C BLK 95 50.L2508.501 SIGNAL/C DUAL DVI-D/DVI-D 200 96 53.L5304.001 F DISK MEA DV172...
  • Page 46 Diamond View Monitor...
  • Page 47 PLL GND TXIN21 PLL VCC BEAD TXIN22 PLL GND +3.3V 0.1U TXIN23 PWR DWM 16V K TXCLK IN DCLK_TTL DHS_TTL DEN_TTL TXIN24 TXIN26 C100 BEAD 0.1U DVS_TTL TXIN25 16V K THC63LVDM83A Diamond View Monitor Dimand View Monitor DV172 Interface Board...

  • Page 48: Interface Board

    IRU1206-25CY +3.3V 20.72060.207 +2.5V 0.1U K 0.1U K 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 50V Z 50V Z 50V Z 50V Z 50V Z 50V Z 50V Z OPEN OPEN Diamond View Monitor Dimand View Monitor DV172 Interface Board...
  • Page 49 1 = OCM becomes active after OCM_CLK is stable Close to respective power Pins Close to respective power Pins ROM_ADDR(12:10) USER_BITS(7:5) Available for reading from a status register Diamond View Monitor Dimand View Monitor ROM_ADDR13 OSC_SEL 0 = XTAL and TCLK pins are connected 0.1U 0.1U...
  • Page 50 4.7K DVISCL BAV99 RX1+ RX1P DVISDA DN10 RXC+ DVISCL BAV99 RX2- RX2M DVISDA RXC- DN11 AT24C02A BAV99 RX2+ RX2P DN12 BAV99 RXC- RXCM DN13 DVIPC5V BAV99 RXC+ RXCP TZMC5V1 TZMC5V1 TZMC5V1 Diamond View Monitor Dimand View Monitor DV172 Interface Board...
  • Page 51 Screw Holes Optical Points OP10 OP11 OP12 OP13 OP14 HOLE-V8 HOLE-V8 HOLE-V8 HOLE-V8 Diamond View Monitor Dimand View Monitor DV172 Interface Board...

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