Envision EN7220 Service Manual
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Envision EN7220 Service Manual

17” lcd monitor
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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.
Manufacture Date:Apr-09-04
1

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Summary of Contents for Envision EN7220

  • Page 1: Service Manual

    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.

  • Page 2: Table Of Contents

    EN7220 Service Manual Table of Contents Table of Contents ---------------------------------------------------------------------- 02 Revision List ---------------------------------------------------------------------------- Monitor Specification -------------------------------------------------------------- 2. LCD Monitor Description --------------------------------------------------------- 3. Operation Instructions ------------------------------------------------------------- 3.1 General Instructions ----------------------------------------------------------- 3.2 Adjusting The Picture --------------------------------------------------------- 4. Input/Output Specification ------------------------------------------------------- 4.1 Input Signal Connector -------------------------------------------------------08 4.2 Factory Preset Display Modes ---------------------------------------------09...
  • Page 3 EN7220 Service Manual 5.3 Electrical Block Diagram -----------------------------------------------------16 5.3.1 Scalar Board -------------------------------------------------------------- 5.3.2 Inverter/Power Board --------------------------------------------------- 6. Schematic ----------------------------------------------------------------------------19 6.1 Scalar Board --------------------------------------------------------------------19 6.2 Inverter/Power Board ------------------------------------------------------22 6.3 Key Pad Board -----------------------------------------------------------------24 7. PCB Layout -------------------------------------------------------------------------- Main Board ---------------------------------------------------------------------25 Inverter/Power Board --------------------------------------------------------26 Keypad Board -----------------------------------------------------------------26 8.

  • Page 4: Revision List

    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 –...

  • Page 5: Lcd Monitor Description

    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.

  • Page 6: Operating Instructions

    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.
  • Page 7 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.

  • Page 8: Input/Output Specification

    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...

  • Page 9: Factory Preset Display Modes

    EN7220 Service Manual 4.2 Factory Preset Display Modes VESA MODES Horizontal Vertical Nominal Sync Nominal Sync Nominal Frequenc Polarity Freq. Polarity Pixel Mode Resolution Total +/- 1 Hz Clock (MHz) 0.5kHz 640x480@60Hz 800 x 525 31.469 59.940 25.175 640x480@72Hz 832 x 520 37.861...

  • Page 10: Power Supply Requirements

    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...

  • Page 11: Panel Specification (Qdi L07)

    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...

  • Page 12: Parameter Guide Line For Ccfl Inverter

    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).

  • Page 13: Block Diagram

    EN7220 Service Manual 5. Block Diagram 5.1 Monitor Exploded View...

  • Page 14: Software Flow Chart

    EN7220 Service Manual 5.2 Software Flow Chart...
  • Page 15 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.

  • Page 16: Electrical Block Diagram

    EN7220 Service Manual 5.3 Electrical Block Diagram 5.3.1 Main Board...

  • Page 17: Inverter/Power Board

    EN7220 Service Manual 5.3.2 Inverter/Power Board Inverter Block Diagram...
  • Page 18 EN7220 Service Manual Power Block Diagram...

  • Page 19: Schematic

    EN7220 Service Manual 6. Schematic 6.1 Main Board 715L1203-1 MST8111B SCHEMATIC GNDR GNDR GNDG GNDG DDC_CLK VCC2.5 VCC3.3 VAA1 VAA2 VAA3 VAA4 DDC_DAT GNDB GNDB ST_DET1 HSY NC HSY NC ST_DET2 VSY NC VSY NC VCC2.5 VCC3.3 VAA1 VAA2 VAA3...
  • Page 20 EN7220 Service Manual CN301 DB15 FB301 　 1/16W R301 　 1/16W C304 0.047uF FB302 1/16W R302 1/16W C305 0.047uF 　 　 FB303 　 1/16W R303 　 1/16W C306 0.047uF R304 　 1/16W C307 0.001uF PC5V R325 C301 C302 C303 VGA_CON 1/16W 　...
  • Page 21 EN7220 Service Manual VCC3.3 FB401 VCC2.5 FB402 VCC3.3 VCC2.5 600 OHM 600 OHM C405 10uF/16V C414 10uF/16V VPLL VDVI VDPLL C406 C407 C408 C409 C410 C411 C412 C413 C415 C416 C417 C418 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF...

  • Page 22: Inverter/Power Board

    EN7220 Service Manual VCPU VCPU RN601 R601 R602 C601 RN602 　 1/16W 　 1/16W 　 1/16W 　 1/16W 0.1uF C602 22pF U601 X601 POWER EA/VP P0.0 ENTER P0.1 C603 RIGHT XTAL1 P0.2 10uF/16V 20MHz LEFT P0.3 AUTO P0.4 LED_B XTAL2 P0.5...
  • Page 23 EN7220 Service Manual Q203 SI4431DY-T1 C215 22pF/3KV +12V L201 R212 3.9K　 D201 R224 R225 R226 C201 C223 C202 Q202 C225 R214 SR24 D203 2K　 2K　 2K 1/16W C216 　 CN202 150uF/25V 150uF/25V 0.1uF/25V DTA144WKA 1uF/25V 3.9K 1/16W 　 RLZ11B PT201...

  • Page 24: Key Pad Board

    EN7220 Service Manual 6.3 Key Pad Board LED_ORANGE 74LCX14 LED_GRN 74LCX14 SOT-23 　 1/16W 　 1/16W +3V3 LED_GRN LED_ORG KEY_AUTO KEY_MENU KEY_LEFT 　 1/16W KEY_RIGHT 　 1/16W KEY_ONOFF WAFER 8P2.0 DUAL R/A KEY_LEFT GPIO6 KEY_AUTO GPIO8 KEY_MENU GPIO3 KEY_RIGHT GPIO7 4.7K...

  • Page 25: Pcb Layout

    EN7220 Service Manual 7. PCB Layout 7.1 Main Board...

  • Page 26: Inverter/Power Board

    EN7220 Service Manual 7.2 Inverter/Power Board 7.3 Keypad Board...

  • Page 27: Maintainability

    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.

  • Page 28: Trouble Shooting

    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...
  • Page 29 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...
  • Page 30 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.

  • Page 31: Power/Inverter 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...
  • Page 32 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.

  • Page 33: Key Pad Board

    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...

  • Page 34: White-Balance, Luminance Adjustment

    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...

  • Page 35: Edid Content

    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...

  • Page 36: Bom List

    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...
  • Page 37 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...
  • Page 38 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...
  • Page 39 EN7220 Service Manual R624 61L0603000 CHIPR 0OHM +-5% 1/10W 1 PCS R301 61L0603101 CHIPR 100 OHM +-5% 1/10 1 PCS R302 61L0603101 CHIPR 100 OHM +-5% 1/10 1 PCS R303 61L0603101 CHIPR 100 OHM +-5% 1/10 1 PCS R305 61L0603101...
  • Page 40 EN7220 Service Manual R617 61L0603471 CHIPR 470 OHM+-5% 1/10W 1 PCS R618 61L0603471 CHIPR 470 OHM+-5% 1/10W 1 PCS R628 61L0603471 CHIPR 470 OHM+-5% 1/10W 1 PCS R201 61L0603472 CHIPR 4.7K OHM +-5% 1/1 1 PCS R205 61L0603472 CHIPR 4.7K OHM +-5% 1/1...
  • Page 41 EN7220 Service Manual C417 65L0603104 32 CHIP 0.1UF 50V X7R 1 PCS C418 65L0603104 32 CHIP 0.1UF 50V X7R 1 PCS C420 65L0603104 32 CHIP 0.1UF 50V X7R 1 PCS C421 65L0603104 32 CHIP 0.1UF 50V X7R 1 PCS C423 65L0603104 32 CHIP 0.1UF 50V X7R...
  • Page 42 EN7220 Service Manual FB403 71L 56Z601 CHIP BEAD 600 OHM 0805 1 PCS FB404 71L 56Z601 CHIP BEAD 600 OHM 0805 1 PCS FB405 71L 56Z601 CHIP BEAD 600 OHM 0805 1 PCS FB406 71L 56Z601 CHIP BEAD 600 OHM 0805...
  • Page 43 EN7220 Service Manual CN204 33L8021 2D E WAFER 0 PCS CN201 33L8021 2D U CONN.2P DIP R/A LM401-0 0 PCS CN202 33L8021 2D U CONN.2P DIP R/A LM401-0 0 PCS CN203 33L8021 2D U CONN.2P DIP R/A LM401-0 0 PCS...
  • Page 44 EN7220 Service Manual C215 65L 3J2206ET 22PF 5% 3KV TDK 1 PCS C216 65L 3J2206ET 22PF 5% 3KV TDK 1 PCS C217 65L 3J2206ET 22PF 5% 3KV TDK 1 PCS C218 65L 3J2206ET 22PF 5% 3KV TDK 1 PCS C901...
  • Page 45 EN7220 Service Manual T901 80LL17T 2 L ADAPTOR BY LITAI 0 PCS T901 80LL17T 2 T X'FMR 1 PCS T901 80LL17T 2 LS ADAPTOR BY LISHIN 0 PCS F901 84L 53 1 FUSE 2A 250V LF-230002 1 PCS F901 84L 7H200 NL...
  • Page 46 EN7220 Service Manual R208 61L0805472 CHIRP 4.7K OHM +-5% 1/8 1 PCS R209 61L0805472 CHIRP 4.7K OHM +-5% 1/8 1 PCS R912 61L1206101 CHIP 100 OHM 5% 1/4W 1 PCS R930 61L1206101 CHIP 100 OHM 5% 1/4W 1 PCS R915...
  • Page 47 EN7220 Service Manual ZD901 93L 39S 20 T RLZ22B BY ROHM 1 PCS D201 93L2004 1 SMAL240LVXRO-SMT 0 PCS D202 93L2004 1 SMAL240LVXRO-SMT 0 PCS D201 93L2004 3 SSM24 0 PCS D202 93L2004 3 SSM24 0 PCS D201 93L2004 2A...
  • Page 48 EN7220 Service Manual J908 95L 90 23 TIN COATED 0 PCS J909 95L 90 23 TIN COATED 0 PCS J910 95L 90 23 TIN COATED 0 PCS J911 95L 90 23 TIN COATED 0 PCS R917 61L 17210052T 100HM 5% 1/4W...
  • Page 49 EN7220 Service Manual D901 93L 6026T52T RECTIFIER DIODE FR107 1 PCS D902 93L 6038P52T PS102R 1 PCS D205 93L 64 1152T 1N4148 1 PCS D206 93L 64 1152T 1N4148 1 PCS D207 93L 64 1152T 1N4148 1 PCS D208 93L 64 1152T...
  • Page 50 EN7220 Service Manual Q903 57L 724 4A STP9NK60ZFP 1 PCS 90L 407 2 HEAT SINK 1 PCS M1L1730 8128 SCREW M3x8 1 PCS ----- -------------------------- ----------------------- ---------- PARE NT NO : 705L 780 57 02 CN901 ASS'Y ----- -------------------------- -----------------------...

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