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SERVICE MANUAL
SPECTRUM Series
LCD Monitor
LM-700/LM-700A
P/N : 41A50-144
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THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS, MANUFACTURE DATA : JULY. 2001 REVISE 7 SEP 2001 1
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TABLE OF CONTENTS PAGE 1. SPECIFICATIONS .................................................................................................... 3 1-1 GENERAL SPECIFICATIONS ...................................................….............. 3 1-2 LCD MONITOR DESCRIPTION .................................................................. 4 1-3 INTERFACE CONNECTOR .................................................................……. 4 2. PRECAUTION AND NOTICES ............................
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1. SPECIFICATIONS FOR LCD MONITOR 1-1 General specifications 1. LCD-PANEL : Active display area 17 inches diagonal Pixel pitch 0.264 mm x 0.264 mm Pixel format 1280 x 1024 RGB vertical stripe arrangement 2. Display Color : 8-bit, 16.7 million colors 3. External Controls : Power On/Off, Auto key, Left key, Right key ( for 4-key ) OSD menu Controls Contrast, Brightness, Focus, Clock,H-position, V-position, Language, Recall-7800, Recall-6500, Reset, Exit-osd, Red, Green, B
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1-2 LCD MONITOR DESCRIPTION The LCD MONITOR will contain an main board, an Inverter module, keyboard and External Adapter which house the flat panel control logic, brightness control logic, DDC and DC-DC conversion The Inverter module will drive the backlight of panel . The Adapter will provides the 12V DC-power 5 Amp to Main-board and Inverter module . Monitor Block Diagram Flat Panel and CCFT Drive. CCFL backlight Inverter RS232 Connector Main Board or
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2. PRECAUTIONS AND NOTICES 2-1 ASSEMBLY PRECAUTION (1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface by touching with bare hands (Polarizer film, surface of LCD panel is easy to be flawed) In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display characteristic and reliability. If this panel is subject to hard pressing, the following occurs : (a) Uniform color (b) Orientation of liquid cryst
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3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the LM700 LCD monitor display. 1. Position the display on the desired operation and plug–in the power cord into External Adapter AC outlet. Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer should attac
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4. ADJUSTMENT 4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS Adjustments should be undertaken only on following function : contrast, brightness focus, clock, h-position, v-position, red, green, blue since 6500 color & 7800 color. 4-2 ADJUSTMENT METHOD Press MENU button to activate OSD Menu or make a confirmation on desired function, Press Left/Right button to select the function or done the adjustment. 1. White-Balance, Luminance adjustment Approximately 30 minutes should be allowe
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9. adjust the GREEN on OSD, until chroma 7120 indicator reached G=100 10. adjust the BLUE on OSD, until chroma 7120 indicator reached B=100 11. repeat above procedure ( item 8,9,10) until chroma 7120 RGB value meet the tolence =100 12. switch the chroma-7120 to xyY mode With press “MODE” button 13. Adjust the Contrast on OSD window until the Y measurement on chroma 7120 reached 2 the value Y= 180 cd/m 14. Press 78 on OSD window to save the adjustment result b. adjust 6500 color-tempe
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2. Clock adjustment Set the Chroma at pattern 63 (cross-talk pattern) or WIN98/95 shut-down mode (dot-pattern). Adjust until the vertical-Stripe-shadow as wide as possible or no visible. This function is adjust the PLL divider of ADC to generate an accurate pixel clock Example : Hsyn = 31.5KHz Pixel freq. = 25.175MHz (from VESA spec) The Divider number is (N) = (Pixel freq. x 1000)/Hsyn From this formula, we get the Divider number, if we fill this number in ADC register (divider regis
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5. CIRCUIT-DESCRIPTION 5-1 SPECIAL FUNCTION with PRESS-KEY A). press Menu button during 2 seconds along with plug-in the DC Power cord: That operation will set the monitor into “Factory- mode”, in Factory mode we can do the White balance adjustment with RS232 , and view the Backlight counter (this counter is use to record the panel activate hours ,for convenient the maintainer to check the panel backlight life time) In Factory mode, OSD-screen will locate in left top of screen. Press
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5-3 SIMPLE-INTRODUCTION about LM700 chipset 1. GMZAN1 ( all-in-one chip solution for ADC, OSD, scalar and interpolation) : USE for computer graphics images to convert analog RGB data to digital data with interpolation process, zooming, generated the OSD font , perform overlay function and generate drive-timing for LCD-PANEL. 2. M6759 (ALI- MCU, type 8052 series with 64k Rom-size and 512 byte ram) : Use for calculate frequency, pixel-dot , detect change mode, rs232-communication, powe
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Main-board Block diagram Input analog RGB & H,V,& ddc signal & Rs232 communication GMZAN1 (U200) Data Digital RGB DDC-chip LVDS chip (U601, PANEL U602) Panel Control Signal: Dhs, Dvs, Dclk Oscillator 50 mhz Panel Power 5V Communication signal: Hclk,Hfs,Hdata0 Panel-Power Control (U202) MCU ( U302 ) Crystal 20 mhz Keyboard module INVERTER module EXTERNAL- ADAPTER 12
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5-4 SOFTWARE FLOW CHART I. Power-On Subrotine CHART Initial MCU I/O, Interrupt vector & Ram Yes Initial 1.POC (backlight counter) Check Eeprom is em pty ? 2. Clr all mode value No OK IF not same, overwrite the data with backup value. Check Previous power-switch status from Eeprom, & other system status Initial GMZAN1 Yes Check if in Factory mode?(when power-on,press th
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II. MAIN SUBROTINE LOOP Main loop start Process Power-saving status ( according to below flow-chart result) ) Check GMZAN IFM status .is change or not. And check Signal cable status ( cable not connected or not ) ** IFM is the register which measured the HSYN & Vsyn status No Yes, IFM have change Wake-up GMZAN1 Yes (because GMZAN1 was in partial sleeping state) Is current system status in Power-saving ? No Yes Check the IFM result is in the standard
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6. A). Interface-Board Trouble-Shooting chart *Use the PC Win 98 white pattern, with some icon on it, and Change the Resolution to 640x480 60 Hz / 31 KHz **NOTICE : The free-running freq. of our system is 48 KHz / 60 Hz, so we recommend to use another resolution to do trouble shooting, this trouble shooting is proceed with 640x480 @60Hz 31Khz I. NO SCREEN APPEAR DC-Power Part Measured Input DC-voltage ( J1)= 12 V? Measured U305 AIC 1084 pin 2 = 3.3V? Check Correspondent componen
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PANEL-POWER CIRCUIT Check the PPWR panel power relative circuit, R223, Q200,U202(pin 5,6,7,8) NG In normal operation, when LED =green, R223 check R225 should have response from 12V to 0V should =0 v, When we switch the power switch from on to off If PPWR no-response when the power switch Turn on and turn off, replace the U200-GMZAN1 OK,R225 have response NG, no Voltage Measured the U202 pin 5,6,7,8= 5 V? Check U202 pin 1,2,3,4= 5V Replace U202 ( Nmos, SI9933) OK NG
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II (a) THE SCREEN is Abnormal , stuck at white screen, OSD window can’t appear, but keyboard & LED was normal operation. At general, this symtom is cause by missing panel data or panel power, so we must check our wire-harness which connected to panel or the panel power controller (U202) Check if the Wire harness from CN601 & CN602 lo ose? Tighten it. Check the wire on both Panel-side and Mainboard side. Yes, tight enough Check the Panel-Power circuit as above (page 15) U2
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KEYBOARD BLOCK check NG Check U302 MCU pin 43,42,41,40,39 at Mechanical was stuck, Check ! High state(5V)? without press any key OK NG Replace Tact-switch SW105 at keyboard if still no work replace U302 MCU at main-board and Press power key and check U302 pin 43 check MCU relative reset circuit, and crystal = low (0V) ? OK Check U302 pin 38 (LED green) will have OK If still no Led green indicator, check Q102, transition from hi to low or low to hi when we
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POWER-BLOCK check **Note : the Waveform of U304 pin 2 can determined the power situation 1. stable rectangle waveform with equal duty, freq around 150K-158KHz that means all power of this interface board is in normal operation ,and all status of 5V & 3.3V is working well 2. unstable or uneven rectangle waveform without same duty, that means ABNORMAL operation was happened, check 3.3V or 5V ,if short-circuit or bad component 3. rectangle waveform with large spike & harmonic pulse on fron
