EN7220 Service Manual SERVICE MANUAL 17” LCD Monitor 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.
EN7220 Service Manual 1. MONITOR SPECIFICATIONS Driving system TFT Color LCD LCD Panel Size 43.2cm(17.0") Pixel pitch 0.264mm( H )x 0.264mm( V ) Viewable angle 140˚ (H) 130˚ (V) Response time (typ.) 25 ms Video Analog Input Sync. Type H/V TTL H-Frequency 30kHz –...
EN7220 Service Manual 2. LCD MONITOR DESCRIPTION The LCD MONITOR will contain an main board, an inverter/power board, keypad board and internal adapter which house the flat panel control logic, brightness control logic and DDC. The Inverter board will drive the backlight of panel and the DC-DC conversion.
EN7220 Service Manual 3. OPERATING INSTRUCTIONS 3.1 GENERAL INSTRUCTIONS Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.
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EN7220 Service Manual The User R/G/B User / Red 0-100 Red Gain from Digital-register. value(default is 100) will not be User / 0-100 Green Gain Digital-register. Modified by Reset Green function. User / Blue 0-100 Blue Gain from Digital-register. Auto Adjust the H/V Position, Auto Config Focus and Clock of picture.
EN7220 Service Manual 4. Input/Output Specification 4.1 Input Signal Connector PIN NO. DESCRIPTION DESCRIPTION PI N NO. Green Detect Cable Blue Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground VGA connector layout...
EN7220 Service Manual 4.3 Power Supply Requirements 4.3.1 Input Requirements INVERTER MAX BRINGTHNESS (Vadj:5.0v), LOAD=120KΩX4(ROOM TEMPERATURE 25℃ ±4℃) ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK Input voltage 10.8 13.2 Input current 2250 2500 FOR 4 LOAD Output Current Iout FOR 1 LOAD...
EN7220 Service Manual 4.4 Panel Specification (QDI L07) 4.4.1 Display Characteristics PARAMETER SPECIFICATION UNIT Display Size 43(17") Diagonal Active area 337.9(H) x 270.3(V) 1280(H) x 1024(V) pixel Pixel format (1 Pixel=R+G+B dots) Pixel pitch 0.264(H) x 0.264(V) Pixel configuration R, G, B vertical stripe...
EN7220 Service Manual 0.556 0.586 0.616 0.116 0.146 0.176 Chromaticity of Blue(CIE 1931) 0.073 0.103 0.133 IL=7.0 Luminance of white cd/㎡ Note 4[Note 4] mArms White Uniformity δw — 1.25 1.33 Note5 Cross talk 1.50% Note6 4.4.3 Parameter Guide for CFL Inverter The backlight system is an edge-lighting type with 2- CCFL(Cold Cathode Fluorescent Lamp).
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EN7220 Service Manual 1) MCU initialize. 2) Is the eeprom blank ? 3) Program the eeprom by default values. 4) Get the PWM value of brightness from eeprom. 5) Is the power key pressed ? 6) Clear all global flags.
EN7220 Service Manual 8. Maintainability 8.1 Equirements and Tools Requirement 1.) Voltmeter. 2.) Oscilloscope. 3 ).Pattern Generator. 4) DDC Tool with a IBM Compatible Computer. 5) Alignment Tool. 6) LCD Color Analyzer. 7) Service Manual. 8) User Manual.
EN7220 Service Manual 8.2 Trouble Shooting 8.2.1 Main Board 1.NO SCREEN APPEAR 1.NO SCREEN APPEAR Measured CN201 pin5 = 12 V? Check Correspondent component. Measured CN201 pin 9/10= 5V? Is there any shortage or cold solder? Measured U202 pin 2= 3.3V? Yes, all DC level exist Yes .there have OSD show...
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EN7220 Service Manual 2.PANEL POWER CIRCUIT Check the PPWR panel power relative circuit, Check R624 should have response from 0V to 5V Q603, Q602(pin7,8) When we switch the power switch from on to off In normal operation, when LED =green, R624...
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EN7220 Service Manual 4.U4-DATA OUTPUT NG , no transition Measured DCLK(pin 29 from U401) DVS, DHS (pin 37,38 from U401 ) Is the waveform ok? Replace MST8111 (U401) or DCLK around 48 MHZ , DVS=60.09Hz , DHS around 80 replace Main board.
EN7220 Service Manual 8.2.2 Power/Inverter Board 1.) No power Check to CN102 Pin1 and pin2 = 5V Check Interface board Check AC line volt 120V or 220V Change F901 , check BD901,Q903,IC901 Check the voltage of C905(+) Check bridge rectified circuit...
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EN7220 Service Manual 2.) W / LED , No Backlight Check C201(+) =12V Change F902 Check D201/Q209/Q210 or D202/Q211/Q212 Check ON/OFF signal Check Interface board Check U201 pin9=12V Change Q201 or Q202 Check the pin1 of U201 have saw tooth Change U201 Check D201(-),D202(-) have the output of square wave at short time.
EN7220 Service Manual 8.2.3 Key Pad Board OSD is unstable or not working Connect KeyPad Is KeyPad Board connecting normally Replace Button Is Button Switch normally ? Switch Replace KeyPad Is KeyPad Board Normally ? Board Check Main Board...
EN7220 Service Manual 9. White-Balance, Luminance adjustment Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment. Before started adjust white balance ,please setting the Chroma-7120 MEM. channel 1 to 6500 color, MEM. channel 2 to 7800 color ( our 6500 parameter is x = 313 ±10, y = 329 ±10, Y = 200 ±10 cd/m...
EN7220 Service Manual b. Adjust 7800 color-temperature 9 Switch the chroma-7120 to RGB-mode (with press “MODE” button ) 10 switch the MEM.channel to Channel 02 ( with up or down arrow on chroma 7120 ) 11 The LCD-indicator on chroma 7120 will show x = 296 ±10, y = 311 ±10, Y = 200 ±5 cd/m...
1 PCS 40L 190673 4A ID LABEL 1 PCS 40L 459673 1A BARBETTE LABEL 1 PCS 40L 459673 2A FRONT LABEL FOR En7220 1 PCS CONNER LABEL FOR 40L 459673 3A 1 PCS En7220 40L 459673 4A BASE LABEL FOR En7220...
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EN7220 Service Manual 44L3725 1 EPS(L) 1 PCS 44L3725 2 EPS(R) 1 PCS 44L9003 1 CORNER PAPER 0.08 PCS 45L 76 28 C PE Bag For Manual 1 PCS 45L 76 31 C PE BAG FOR BASE 1 PCS 45L 77 3 173 CM 打包膜...
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EN7220 Service Manual CBPC780KQXEN ----- -------------------------- ----------------------- ---------- AIC780KQXEN MAIN BOARD 1 PCS CN201 33L800912K H 2*6PIN DUAL ROW RIGHT 1 PCS CN503 33L801724A H PIN HEADER 24P 2.0mm 1 PCS CN602 33L8027 16 WAFER 16PIN 2.0mm DIP 1 PCS...
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