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Acer 7277e Service Manual

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7277e Monitor
Service Guide
September 1998
Printed in Taiwan
PART NO.:49.70601.271
DOC NO.:9809A-7277ESG

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  • Page 1 7277e Monitor Service Guide September 1998 Printed in Taiwan PART NO.:49.70601.271 DOC NO.:9809A-7277ESG...
  • Page 2 Copyright Copyright symbol 227 \f "Symbol" \s 10} 1998 by Acer Peripherals, Inc. 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 Acer Peripherals, Inc.

  • Page 3: Table Of Contents

    Table of Contents toc \o "1-3" \t "chapter title,1,subtitle 02,2,subtitle 03,3,subtitle 04,4" Table of Contents............................... iii 1. SYSTEM OVERVIEW ............................... 1-1 1.1 Introduction ................................. 1-1 1.2 Operational Specification ............................ 1-2 1.2.1 Environment ............................1-2 1.2.1.1 Temperature........................1-2 1.2.1.2 Humidity..........................1-2 1.2.1.3 Altitude ..........................
  • Page 4 2.2.4.3 DC Restore CKT ....................... 2-12 2.2.4.4 ABL CKT (Auto Brightness Limit)................... 2-12 2.2.4.5 H-BLANK CKT ........................ 2-12 2.2.4.6 Brightness, V-blank, Change Mode Blank, Spotkiller CKT..........2-12 2.3 Microcontroller Circuit Operation Theory......................2-12 7277e Monitor Service Guide API Confidential No Copy/Reproduction Allowed...
  • Page 5 4.11 Horizontal Size Can Not Control........................4-7 4.12 Size Regulation NG ............................4-8 4.13 Unstable Vertical Display..........................4-8 4.14 No Blanking............................... 4-9 Appendix A....................................A-10 7277E Spare Parts List............................... A-10 Important Service Instruction ........................A-11 Table of Contents API Confidential No Copy/Reproduction Allowed...

  • Page 7: System Overview

    A power management function has been designed to save power consumption and power management is compliant with VESA and TCO. The monitor is available with two industrial designs: one for ACER and the other for OEM. It has the following features:...

  • Page 8: Operational Specification

    -A flat drop with impact on the top After test, there is no electrical and mechanical damage permitted. 1.2.4 Electrostatic Discharge Requirements The subject product must withstand 15kv test voltage of electrostatic discharge and meet the 7277e Monitor Service Guide API Confidential No Copy/Reproduction Allowed...

  • Page 9: Safety Requirements

    requirement as specified in ESD standard IEC801-2. 1.2.5 Safety Requirements The display unit complies with the following safety standards and specifications. 1.2.5.1 110V Version -UL compliance...standard for information-processing and business equipment, UL 1950. -CSA compliance...standard C22.2 No. 950-M89, data processing equipment. -DHHS...rules 21 sub-chapter J as of date of manufacture.

  • Page 10: Input/Output Specifications

    Analog 0.7 Vpp/75 ohm positive. 1.3.1.3 SYNC Signal - Separate SYNC : TTL level - Horizontal SYNC : positive/negative - Vertical SYNC : positive/negative - Composite SYNC : TTL level, positive/negative 7277e Monitor Service Guide API Confidential No Copy/Reproduction Allowed...

  • Page 11: Timing

    1.3.1.4 Timing The video signal timing is as follows. SEPARATE SYNC. video HORIZONTAL video VERTICAL Sync. Polarity: Positive/Negative - PRESET TIMING - VGA/SVGA Timing VGA400 VGA480 6448A 6448B ( fH) 31.47KHz 31.47KHz 37.50KHz 43.27KHz (Aus) 31.77 31.77 26.667 23.111 (Bus) 3.81 3.81 2.032...
  • Page 12 2.242 (Dus) 15.754 13.653 11.96 (Eus) 0.369 0.320 0.374 (fv) 60.004Hz 70.069Hz 60.392Hz (Oms) 16.66 14.272 16.558 (Pms) 0.124 0.106 0.047 (Qms) 0.513 0.498 (Rms) 15.88 13.599 15.921 (Sms)0.062 0.053 0.90 7277e Monitor Service Guide API Confidential No Copy/Reproduction Allowed...

  • Page 13: Input Signal Quality

    - Display - Resolution 1024x768 1024x768 1280x1024 - Polarity H/V - Sync type separate separate separate - UVGA8 (fH) 68.677KHz (Aus) 14.561 (Bus) 1.016 (Cus) 2.201 (Dus) 10.836 (Eus) 0.508 (fv) 85Hz (Oms) 11.765 (Pms) 0.044 (Qms) 0.524 (Rms) 11.183 (Sms) 0.015 Display...

  • Page 14: Output Power Requirements

    The color picture tube used shall be a 17 inch, 90 degrees, HI-RES tube and shall have the following features: -Type: 17" in line electron gun, full square/flat face. -Dot pitch: 0.28mm dot triad -Phosphor: P22 or equivalent -Light transmittance: 52% -Faceplate treatment: non-glare -Double focus 7277e Monitor Service Guide API Confidential No Copy/Reproduction Allowed...

  • Page 15: Functional Specifications

    1.4 Functional Specifications All the tests to verify specifications in this section must be performed under the following standard conditions unless otherwise noted. The standard conditions are: -Temperature : 25 +-5 degree Celsius -Magnetic field : No additional magnetic field in near side, CRT faces to East. -AC line input voltage : 110Vac -Warm-up time : 30 minutes minimum -Checking display mode : All the presenting modes, as 3.1.4 shown.

  • Page 16: Geometric Distortion (With 20Ft-L At Full White Pattern)

    1.4.1.11 DDC1/2B Table Address Data Description Header ID Manufacturer Name = ID Product Code = 7277e (Vender Assigned code) ID Serial Number 32 bits serial no. (use 0 if n/a) Week of Manufacture (0-53),use 0 if n/a Year of Manufacture (year - 1990)
  • Page 17 Green x bit9-2 Green y bits9-2 Blue x bit9-2 Blue y bit9-2 White x bit9-2 White y bit9-2 Address Data Description Established Timing I Established Timing II Established Timing III Standard Timing Identification #1 800x600 / 85Hz #2 1280x1024 / 60Hz #3 640x480 / 85Hz #4 1024x768/85Hz Detailed Timing Description # 1...
  • Page 18 Analog / Digital Signal Level Signal Level Standard (6) Signal Level Standard (5) Setup Sync Inputs Supported (3) Sync Inputs Supported (2) Sync Inputs Supported (1) Sync Inputs Supported (0) 7277e Monitor Service Guide 1-12 API Confidential No Copy/Reproduction Allowed...
  • Page 19 Description Analog / Digital Input : Defines usage of the rest if the byte as "analog input" or digital input". Analog=0, Digital=1 . If input is described as analog, the following definitions apply to bits 6-0. Digital is as yet undefined in the following but provisions have been made in anticipation of a common video output standard for Flat Panel Display (FPD) use.

  • Page 20: Color Quality

    Use "crosshatch" white pattern, then set the brightness control at weight number is 50 & contrast control max to examine the convergence. The misconvergence must strictly meet the requirements stated as follows: Center <= 0.15mm 230mm A : <= 0.30mm B : <= 0.40mm 310mm 7277e Monitor Service Guide 1-14 API Confidential No Copy/Reproduction Allowed...

  • Page 21: Moire (The Distance Of Watch Is 30Cm From Eyes To Screen)

    1.4.2.2 Moire (the distance of watch is 30cm from eyes to screen) In the pattern of all green, all blue, all red, or all white, and the luminance is > 25Ft-L, The moire is not visible, excluding 20mm stripe area from each edge left & right. 1.4.2.3 Impurity Impurity should not appear in the pattern of all green, all blue, all red, or all white, the brightness is 0 to max Ft-L and the screen display is set to east direction.

  • Page 22: Presetting

    Side-pincushion, Trapezoid, parallelogram, Tilt, Brightness, Contrast, iColor, all the changes will be saved automatically after about 20-second delay when finished the settings or press " S " to save the settings immediately. 7277e Monitor Service Guide 1-16 API Confidential No Copy/Reproduction Allowed...

  • Page 23: Microcontroller Control

    1.4.3.4 Microcontroller Control (1) Memory Partition There are 22 memory partitions which are used to memory 22 display modes including its timing formats and display settings, which includes H-size, V-size, H-phase, V-center, Side-pin, Trapezoid, parallelogram, and divided to two area-one for factory preset and the other for user setting area.
  • Page 24 (6) Pattern Generator CHROME-2000 (or equivalent). A service manual will be available which covers all service requirements. A users manual written in German, Italian, and English will be available to ship with the product. 7277e Monitor Service Guide 1-18 API Confidential...
  • Page 25 Fig.1 Linearity Measurements X11 ~ X18 Xmax - Xmin ------------------- X 100% Xmax + Xmin Ymax - Ymin ------------------- X 100% Ymax + Ymin System Overview API Confidential 1-19 No Copy/Reproduction Allowed...
  • Page 26 A, B represented as display area width and height Top/Bottom Pincushion = (a1 or a2) Side Pincushion = (b1 or b2) substituted A by (PS + QR)/2 B by (PQ + RS)/2 7277e Monitor Service Guide 1-20 API Confidential No Copy/Reproduction Allowed...
  • Page 27 Fig.3 Barreling Measurements A, B represented as display area width and height Top/Bottom Pincushion = (a1 or a2) Side Pincushion = (b1 or b2) substituted A by (PS + QR)/2 B by (PQ + RS)/2 System Overview API Confidential 1-21 No Copy/Reproduction Allowed...
  • Page 28 * Each of the 4 corners of picture shall fall within the relevant area (F) illustrated up (hatched) * ABCD is the picture outlines. V (Cent) = |A-B| < 6mm H (Cent) = |C-D| < 6mm 7277e Monitor Service Guide 1-22 API Confidential No Copy/Reproduction Allowed...
  • Page 29 Fig.6 Physical Dimension, Front View System Overview API Confidential 1-23 No Copy/Reproduction Allowed...
  • Page 30 Fig.7 Physical Dimension, Side View 7277e Monitor Service Guide 1-24 API Confidential No Copy/Reproduction Allowed...
  • Page 31 C h a p t e r 2 CIRCUIT OPERATION THEORY 2. 1 Deflection CKT 2.1.1 The Block Diagram of Deflection H-sync Digital Tilt Rotation Coil V-sync Controller Circuit I2C BUS AutoSync Deflection Controller IC TDA4854 Vertical Deflection Step Up Output G1 &...
  • Page 32 HDRV Q301 0.22U C303 C2235 100V 0.1U (MPE) D301 1N4148 (MONO) D304 1N4005 FR306 C306 1/4W 4300P 630V (PP) D303 1N4148 Fig 3 HDRV & output circuit 2.1.4 Dynamic Focus CKT API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...
  • Page 33 According to the CRT spec H dynamic focus Vpp = 300 V H dynamic focus Vpp = 130 V 2.1.4.1 Vertical Dynamic Focus The signal from IC201 (pin 32) is a vertical frequency parabolic waveform. Q321 : an inverting amplifier stage. 2.1.4.2 Horizontal Dynamic Focus The wavefom of C313 (CS-2, CS-1) is a horizontal frequency parabolic waveform, and is amplified by T304.
  • Page 34 1/4W +12V L301 R333 C337 C334 BYM26A Q310 D318 19.60058.001 H945 C323 R370 Q312 250V IRF630 (EL) D317 Q311 1N4148 R371 L306 A733 BEAD 1/4W Fig 6 BDRV & Step-up circuit API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...
  • Page 35 (1%) (EL) +48V R217 R218 100K IC201 (1%) (1%) TDA4854 Fig 8 HV- shutdown CKT 2.1.9 Horizontal linearity CKT 7277e Cs control truth table Frequency range Cs Capacitor Fh 36K C313 +C311+C314+C312 36KFh40K C313+C314+C312 40KFh50K C313 +C314 50KFh62K C313+C311 62KFh72K...
  • Page 36 C330 0.1U R357 (EL) +12V R383 57.6K (MONO) R328 8.2K R358 Q323 H945 15.4K R378 R385 2.2K 4.7K R376 ABLADJ Q324 2.4K H945 D324 (OPEN) R377 (OPEN) Fig 10 ABL circuit API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...
  • Page 37 2.1.11 TILT CKT We can rotate raster clockwise or counterclockwise by changing the direction of the current flow through the tilt coil. When the voltage of MP202(pin3) is larger than 6.5V, the current flows from Q205 to Tilt coil, other wise, the current flows from tilt coil to Q206 +12V +12V +6.5V...
  • Page 38 AC INPUT C612 220U DC OUTPUT 400V (EL) When power switch is turn on, the AC voltage is Rectifier and filter by D602~D605, C612. The DC output voltage will be 1.4*(ac input) API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...
  • Page 39 2.2.3.3 Switching Element and Isolation Transformer FR701 T601 (SHORT) R604 C613 0.01U ZD601 (OPEN) C614 D610 D613 UF4007 (OPEN) (OPEN) FR702 L606 (SHORT) (BEAD) L608 D608 C608 RGP10D (BEAD) C624 (EL) 220P Q602 FS14SM-12 L607 (BEAD) R619 D614 R608 UF4007 R607 0.15 FR704...
  • Page 40 1N4148 C621 DEGAUSS D708 C708 R705 2200P 250V 1N4148 (OPEN) CN602 (EL) D603 RL601 R706 Q706 20D6 TR602 H945 4.7K 2R9M D604 L604 20D6 180UH D605 M602 TR601 20D6 8D-13 2-10 API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...
  • Page 41 This circuit has the function of auto degaussing and manual degaussing. When power supply is switched ON it is auto degaussing stage. When user make the selection of the manual degaussing function in OSD, the degaussing current will flow through coil to degauss the screen of monitor. TR602 is a PTCR to control degaussing coil current 2.2.3.8 Power Saving Control Mode...

  • Page 42: Introduction

    This model, 7277e, will support powerful OSD function to help end user fine adjustment. The Microcontroller circuit of the 7277e can determine what mode it is by detecting the frequency of horizontal and vertical synchronous and the polarity of horizontal synchronous, and provide DC voltages to control the picture and save the adjusted value into the EEPROM by using the OSD, "On Screen Display control",...

  • Page 43: Block Diagram

    2.3.2 Block diagram The major parts of 7277e Microcontroller circuit are MCU, EEPROM, OSD IC, and Auto Calibration Module. The circuit block diagram is shown as below. (MTV112) Degaussing Detecting the Hsync Blanking input signals Vsync SC0 - SC2 of H,Vsync &...

  • Page 44: Hat Are The Valid Key Functions For User

    2.3.3.5 How to Display the OSD Menu The OSD IC of 7277e is MC141542 which is developed by vender, it receives the data of the OSD fonts and attribute what we want to display on the screen from the MCU by 2 wires of...

  • Page 45: Flowchart For Auto Calibration

    2.3.3.7 Flowchart for Auto Calibration Start Press i-key? Change mode? Preset timing? User saved timing? Read data Detect if Determine a of timing from the pattern preset timing EEPROM is normal? Determine h_phase & h_size Determine v_center &v_size Show the correct pattern on screen Circuit Operation Theory...

  • Page 47: Alignment Procedure

    C h a p t e r 3 ALIGNMENT PROCEDURE 3.1 Preparation for Alignment (I) Setup unit and keep it warm up at least 30 minutes (II) Signal mode Mode Frequency (H/V) Display 31.47k/70Hz (- /+ ) 640 * 400 (VGA400) 31.47k/60Hz (- / - ) 640 * 480 (VGA480) 37.5 k / 75Hz (- /- )

  • Page 48: Focus Adjustment

    VERT SIZE 230 2 mm SIDE PIN 2.0 mm TOP/BOTTOM PIN 2.0 mm SIDE BARREL 1.5 mm TOP/BOTTOM BARREL 1.5 mm TRAPEZOID 2.0 mm VIDEO OFFSET 4.0 mm PARALLELOGRAM 3.5 mm API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...

  • Page 49: Power Saving Function Check

    3.11 Power Saving Function Check a. Input mode 31KHz [VGA 400] with full white pattern. b. Press both contrast and brightness keys to maximum position. c. Remove the horizontal sync signal from input, the unit will go into "Standby" mode. The picture will disappear, and the LED indicator is amber.

  • Page 51: Troubleshooting

    C h a p t e r 4 Troubleshooting 4.1 Check MCU and OSD for No Video Output Check MCU and OSD for no video output Start Use a preset timing Check +5V, ok ? (1) On the Main Board, (a) IC801 pin40 (b) IC802 pin8 Check +5V power...

  • Page 52: Check Osd, Mcu For No Osd Window

    Case 4: No video display on screen, but OSD can display on screen Check IC101 pin 10 (Video Contrast). If it is 0 volt, check IC1901 or maybe IC101 pin 10 short. API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...

  • Page 53: No Output Power

    Case 5: OSD control cannot adjust Bias Check IC1901. Check DC restore circuit. Case 6: OSD control cannot adjust Drive Check IC101 and IC1901. Case 7: OSD control cannot adjust Contrast Check IC 101 and IC1901. Case 8: OSD control cannot adjust Brightness Check brightness control circuit (G1) and IC801 BRITE output.

  • Page 54: No Raster

    5. H.V. ABNORMAL H.V. ABNORMAL CHECK C309,C306 YOKE CONNECTOR LINEAR COIL L305 CORRECT IT! CHECK FBT PIN2 AT VGA(31K) ABOUT 63V ? CHECK Q312,D318 CHECK DRIVER CKT REPLACE T302,L301 CHECK IC201 CHECK FBT(T301) API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...

  • Page 55: Check Ic201

    4.7 Check IC201 6. CHECK IC201(TDA4856) DEFLECTION OUTPUT ABNORMAL CHECK PIN10(VCC) =12V ? CHECK PIN6,PIN8 OUTPUT REPLACE (FREQ & DUTY) IC203 CHECK +14.5V (LM7812) CHECK CHECK PIN30 Q301,Q310,Q311 >4.4V ? Q201 CHECK Q701 EMITTER CHECK CHECK =14.5V R251,R253 SUSPEND SIGNAL CHECK R249,C216 ="HIGH"...

  • Page 56: No Vertical Output And Retrace Line No Blanking

    IF IT BECOMES CHECK CONNECTOR VERY LOW (LESS THAN P102 G1 VOLTAGE -120VDC) WHEN POWER SWITCH OFF. G1=0 CHECK Q202 CHECK Q202 REPLACE CHECK BLANK SIGNAL UC CKT CHECK R216,R217,R218 HOLDDOWN CKT API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...

  • Page 57: Focus Ng

    4.10 Focus NG 10. FOCUS NG FOCUS NG CHECK IC201 PIN32 WAVEFORM CHECK FOCUS TRACE CHECK H-PARA SIGNAL CHECK Q321 FOCUS C329,R354,R327 REPLACE REPLACE REPLACE COMPONENT REPLACE IC201 CHECK CS-1,CS-2 SIGNAL FOIL TRACE 4.11 Horizontal Size Can Not Control 11. HORIZONTAL SIZE CAN NOT CONTROL HORIZONTAL SIZE CAN NOT CONTROL CHECK Q314,Q315,Q316 REPLACE...

  • Page 58: Size Regulation Ng

    REPLACE FBT 4.13 Unstable Vertical Display 14.Unstable Vertical Display Unstable Vertical Displa IC201 pin 24 sawtooth genentor Check IC201 IC 202 & Ambient has output Check IC202 Check DY & Ambient API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...

  • Page 59: No Blanking

    4.14 No Blanking 15. No Blanking No Blanking IC801 pin 6 has output Check Q202 Trace open. & Ambient Troubleshooting API Confidential No Copy/Reproduction Allowed...

  • Page 60: 7277E Spare Parts List

    Appendix A 7277E Spare Parts List PART NUMBER DESCRIPTION LOCATION 55.70601.001 MAIN BD 7277E(MI) 01.00112.000 IC MONI CTRL MTV112E DIP 40P IC801 02.02404.000 IC EEPROM 24C04 4K-BIT IC802 04.01279.010 IC VIDEO AMP LM1279 IC101 04.03842.040 IC V.R. UC3842 IC601 04.04856.070...

  • Page 61: Important Service Instruction

    ASSY BZL D065 7277S 60.70621.xxx ASSY U/C 002 7277S 44.72802.xxx CTN AB 555*516*490 47.70608.001 CUSHION TOP EPS 7277E/ASPIRE 47.70609.001 CUSHION BTM EPS 77E/ASPIRE 49.70601.051 MANU USER(5L) ASPIRE 77S Important Service Instruction :The components identified by the mark ofin the schematic are important X-radiation and safety parts.
  • Page 62 :The components identified by the mark ofin the schematic are important safety parts. If replacement is required, refer to service manual to re-adjust and/or re-checked the B+ and high voltage to reach the specified value. A-12 API Confidential 7277e Monitor Service Guide No Copy/Reproduction Allowed...

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