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EN7220 Service Manual

5

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.

Power board

(include:adapter,inverter))

Flat Panel and

CCFL backlight

Main Board

Keyboard

RS232 Connector

For white balance

adjustment in

factory mode

HOST Computer

CCFT Drive.

AC-IN

100V-240V

Video signal, DDC

Monitor Block Diagram

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Summary of Contents for EN-7220

Page 1: ...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 DISC...

Page 2: ...ecification 08 4 1 Input Signal Connector 08 4 2 Factory Preset Display Modes 09 4 3 Power Supply Requirements 10 4 3 1 Input Output Requirements 10 4 3 2 Inverter Max Brightness 10 4 3 3 Inverter Min...

Page 3: ...Power Board 22 6 3 Key Pad Board 24 7 PCB Layout 25 7 1 Main Board 25 7 2 Inverter Power Board 26 7 3 Keypad Board 26 8 Maintainability 27 8 1 Equipments and Tools Requirements 27 8 2 Trouble Shootin...

Page 4: ...Hz 80kHz V Frequency 55 75Hz Display Colors Over 16 million Colors Dot Clock 135MHz Max Resolution 1280 x 1024 Plug Play VESA DDC2BTM Power Consumption ON Mode 45W OFF Mode 3W Maximum Screen Size Hori...

Page 5: ...e flat panel control logic brightness control logic and DDC The Inverter board will drive the backlight of panel and the DC DC conversion Power board include adapter inverter Flat Panel and CCFL backl...

Page 6: ...em Main Menu Icon Sub Menu Item Sub Menu Icon Description Adjust Range Reset Value Contrast Contrast from Digital register 0 100 Recall Cool Contrast Value Luminance Brightness Backlight Adjustment 0...

Page 7: ...100 50 OSD Setup OSD Timeout Adjust the OSD timeout 10 120 10 English N A Set OSD display language to English N A Deutsch N A Set OSD display language to German N A Fran ais N A Set OSD display langua...

Page 8: ...Input Signal Connector PIN NO DESCRIPTION PI N NO DESCRIPTION 1 Red 9 5V 2 Green 10 Detect Cable 3 Blue 11 NC 4 Ground 12 DDC Serial Data 5 Ground 13 H Sync 6 R Ground 14 V Sync 7 G Ground 15 DDC Ser...

Page 9: ...3 N 60 004 N 65 000 1024x768 60Hz 1312x813 48 78 N 60 00 N 64 000 1024x768 70Hz 1328x806 56 476 N 70 069 N 75 000 1024x768 72Hz 1304x798 57 515 P 72 074 P 75 000 1024x768 75Hz 1328x804 60 200 N 74 90...

Page 10: ...0 1600 1750 Vrms NO LOAD H V Load Vload 710 810 910 Vrms RL 120K Start voltage Vst 1650 1750 1850 Vrms RL CCFL Protect delay time PDT 0 4 1 4 Sec 4 3 2 Output Requirements INVERTER MIN BRINGTHNESS Vad...

Page 11: ...eflection 5 Lamp Quantity 4 pcs 4 4 2 Optical Characteristics The optical characteristics are measured under stable conditions at 25 Room Temperature Parameter Symbol Condition Min Typ Max Unit Remark...

Page 12: ...Inverter The backlight system is an edge lighting type with 2 CCFL Cold Cathode Fluorescent Lamp The characteristics of four lamps are shown in the following tables PARAMETER SYMBOL MIN TYP MAX UNIT R...

Page 13: ...EN7220 Service Manual 13 5 Block Diagram 5 1 Monitor Exploded View...

Page 14: ...EN7220 Service Manual 14 5 2 Software Flow Chart 1 2 N Y 5 Y N 10 Y N 12 Y N 7 Y N 6 4 3 8 9 14 11 13 Y N 15 Y N 16 17 19 Y N 18...

Page 15: ...LED and set it to green color Scaler initialize 10 In standby mode 11 Update the life time of back light 12 Check the analog port are there any signals coming 13 Does the scalar send out a interrupt r...

Page 16: ...EN7220 Service Manual 16 5 3 Electrical Block Diagram 5 3 1 Main Board...

Page 17: ...EN7220 Service Manual 17 5 3 2 Inverter Power Board Inverter Block Diagram...

Page 18: ...EN7220 Service Manual 18 Power Block Diagram...

Page 19: ...AD1 AD2 AD3 VCC3 3 VAA3 VCPU VAA1 VLCD VCC2 5 VAA2 U201 RT9164 25CG 3 2 1 VI VO GND VAA4 VCC5V SOT 223 onBACKLITE 6 D202 GS1D Q204 PMBS3904 3 2 1 VCC3 3 C210 0 1uF VAA1 C202 220uF 25V DIM R205 4 7K 1...

Page 20: ...C5V C313 0 1uF FB303 0 1 16W D312 NC R304 470 1 16W D301 BAV99 3 1 2 C311 33pF D315 NC D319 MLL5232B 5 6V VGA_CON D309 NC ST_DET2 6 GIN 4 CLK 4 VCC5V D318 MLL5232B 5 6V C307 0 001uF FB302 0 1 16W B 4...

Page 21: ...NC0 VSYNC0 R R G G B B CK CK REXT REFP REFM CSZ SDA SCL HWRESETZ INT PWM0 PWM1 LVACKM AVDD AVDD_MPLL AVDD_DVI BYPASS AVDD_DVI VDDP VDDP VDDP VDDP VDDP VDDP VDDP VDDC VDDC VDDC VDDC AVSS_DVI AVSS AVSS_...

Page 22: ...0 39 38 37 36 24 25 26 27 28 29 30 31 19 18 32 33 13 11 22 44 12 EA VP XTAL1 XTAL2 RESET INT0 P3 2 INT1 P3 3 T0 P3 4 T1 P3 5 P1 0 P1 1 P1 2 P1 3 P1 4 P1 5 P1 6 P1 7 P0 0 P0 1 P0 2 P0 3 P0 4 P0 5 P0 6...

Page 23: ...R225 2K R232 1K U201 TL1451ACNSR 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 CT RT 1IN 1IN 1FBK 1DTC 1OUT GND Vcc 2OUT 2DTC 2FBK 2IN 2IN SCP REF Q208 MPS3906 3 2 1 R208 4 7K 1 16W CN202 1 2 3 4 R218 470 L2...

Page 24: ...3 C85 0 001uF R90 0 1 16W R91 0 1 16W LED_GRN C83 0 001uF C GND KEY_RIGHT C88 0 001uF LED_ORG SOT 23 KEY_LEFT 3V3 KEY_RIGHT KEY_MENU CN9 WAFER 8P2 0 DUAL R A 2 4 6 8 1 3 5 7 E gm5126 A Keypad AOC B 5...

Page 25: ...EN7220 Service Manual 25 7 PCB Layout 7 1 Main Board...

Page 26: ...EN7220 Service Manual 26 7 2 Inverter Power Board 7 3 Keypad Board...

Page 27: ...al 27 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 M...

Page 28: ...cable again Check LED status Led Green Replace U601 Flash Rom No nothing is show Connected the Signal cable again Check Power switch is in Power on status and check if Power switch had been stuck Led...

Page 29: ...NG no Voltage Measured the Q601 pin 3 5 V Replace Q601 N MOS SI9933 OK OK Yes NG Check the Bklt On relative circuit R212 R205 In normal operation when LED green R212 R205 Bklt On should 5 v If Bklt On...

Page 30: ...4 U4 DATA OUTPUT 8 2 2 KEYPAD BOARD Measured DCLK pin 29 from U401 DVS DHS pin 37 38 from U401 Is the waveform ok DCLK around 48 MHZ DVS 60 09Hz DHS around 80 KHz refer to input signal 640x480 60 Hz 3...

Page 31: ...20V or 220V NG OK Change F901 check BD901 Q903 IC901 Check the voltage of C905 Check bridge rectified circuit NG OK Check start voltage for the pin3 of IC901 Change IC901 NG Repeating the start voltag...

Page 32: ...01 have saw tooth NG OK Change U201 Check D201 D202 have the output of square wave at short time NG OK Check Q205 Q207 Q203 D201 or Q206 Q208 Q204 D202 Check the resonant wave of pin2 pin5 for PT201 P...

Page 33: ...2 3 Key Pad Board OSD is unstable or not working Is KeyPad Board connecting normally Connect KeyPad B d Is Button Switch normally Replace Button Switch Y N N Is KeyPad Board Normally Replace KeyPad Bo...

Page 34: ...l activate the factory mode then MCU will do AUTO LEVEL automatically Meanwhile press MENU the OSD screen will located at left top of panel I Bias adjustment 1 Set the contrast to 70 2 Sdjust the Brig...

Page 35: ...20 RGB value meet the tolerance 100 2 16 Press Exit on OSD window to save the adjustment result Turn the POWER button off to on to quit from factory mode 10 EDIT Content D SUB Connector Analog x0 x1 x...

Page 36: ...3L4679 GM X CLIP 2 PCS 34L1197AGN L BEZEL 1 PCS 34L1198AGM 2L REAR COVER 1 PCS 40L 154501 1 HI POT GND LABEL FOR MO 1 PCS 40L 190673 4A ID LABEL 1 PCS 40L 459673 1A BARBETTE LABEL 1 PCS 40L 459673 2A...

Page 37: ...M TAPE 2 PCS 52L 1208 A ALUMINIUM TAPE 2 PCS 52L6020 1 PROTECT FILM 0 PCS 52L6025 11587 MYLAR 138X144 1 PCS 52L6025 11588 MYLAR 120X100 1 PCS 70L1700673 1D CD MANUAL 1 PCS 85L 635502 MAIN SHIELD 1 PCS...

Page 38: ...E25A 1 PCS U301 56L1133 34 M24C02 WMN6T SMT 1 PCS U602 56L1133516 M24C16 WMN6T 1 PCS Q201 57L 417 4 PMBS3904 PHILIPS SMT 04 1 PCS Q202 57L 417 4 PMBS3904 PHILIPS SMT 04 1 PCS Q204 57L 417 4 PMBS3904 P...

Page 39: ...R 1K OHM 5 1 10W 1 PCS R202 61L0603103 CHIPR 10K OHM 5 1 10 1 PCS R204 61L0603103 CHIPR 10K OHM 5 1 10 1 PCS R206 61L0603103 CHIPR 10K OHM 5 1 10 1 PCS R208 61L0603103 CHIPR 10K OHM 5 1 10 1 PCS R211...

Page 40: ...10 50V X7R 1 PCS C610 65L0603102 32 1000PF 10 50V X7R 1 PCS C201 65L0603104 32 CHIP 0 1UF 50V X7R 1 PCS C203 65L0603104 32 CHIP 0 1UF 50V X7R 1 PCS C205 65L0603104 32 CHIP 0 1UF 50V X7R 1 PCS C207 65...

Page 41: ...65L0603330 31 33PF 5 50V NPO 1 PCS C304 65L0603473 32 CHIP 0 047UF 50V X7R 1 PCS C305 65L0603473 32 CHIP 0 047UF 50V X7R 1 PCS C306 65L0603473 32 CHIP 0 047UF 50V X7R 1 PCS C308 65L0603473 32 CHIP 0...

Page 42: ...1 PCS D303 93L 64 33 BAV99 1 PCS D601 93L 6432V LL4148 GS08 1 PCS D201 93L1004 3 SS14 1 PCS D202 93L1020 1 S GS1D P 1 0000 P CS 715L1150 B MAIN BOARD PCB 1 PCS PARE NT NO KEPC780KB8 KEY BOARD FOR T780...

Page 43: ...9 32 SG6841D BY SYSTEM 1 PCS Q209 57L 761 6 2SC5706 DIP SANYO 1 PCS Q210 57L 761 6 2SC5706 DIP SANYO 1 PCS Q211 57L 761 6 2SC5706 DIP SANYO 1 PCS Q212 57L 761 6 2SC5706 DIP SANYO 1 PCS R919 61L 2J3986...

Page 44: ...5102 3K 1000UF 20 16V 0 PCS C905 67L305S10114H 100UF 20 400V 1 PCS FB901 71L 55 29 FERRITE BEAD 1 PCS L902 73L 174 26 LS COMMON CHOKE 0 PCS L902 73L 174 26 T1 LINE LILTER 0 45mm 1 PCS L203 73L 174 30...

Page 45: ...PCS Q205 57L 417 4 PMBS3904 PHILIPS SMT 04 1 PCS Q206 57L 417 4 PMBS3904 PHILIPS SMT 04 1 PCS Q207 57L 417 6 PMBS3906 PHILIPS SMT 06 1 PCS Q208 57L 417 6 PMBS3906 PHILIPS SMT 06 1 PCS Q202 57L 760 4...

Page 46: ...40 2F CHIP 24KOHM1 1 4W 1 PCS R909 61L1206472 CHIP 4 7KOHM 5 1 4W 1 PCS R910 61L1206472 CHIP 4 7KOHM 5 1 4W 1 PCS R911 61L1206472 CHIP 4 7KOHM 5 1 4W 1 PCS R906 61L1206754 CHIP 750KOHM 5 1 4W 1 PCS R9...

Page 47: ...PT202 6L 31502 1 5MM RIVET 2 PCS 715L1103 D PCB 1 PCS FB903 95L 90 23 TIN COATED 0 PCS J201 95L 90 23 TIN COATED 0 PCS J202 95L 90 23 TIN COATED 0 PCS J203 95L 90 23 TIN COATED 0 PCS J204 95L 90 23 TI...

Page 48: ...CFR 10K OHM 5 1 6W 1 PCS R222 61L 60212352T 12KOHM 5 1 6W 1 PCS R223 61L 60212352T 12KOHM 5 1 6W 1 PCS R238 61L 60212352T 12KOHM 5 1 6W 1 PCS R239 61L 60212352T 12KOHM 5 1 6W 1 PCS R210 61L 60215352T...

Page 49: ...N 1 PCS C221 64L701J4740AT 0 47uF 50V 1 PCS C222 64L701J4740AT 0 47uF 50V 1 PCS C208 65L 44233113T 330PJNPO 50V 1 PCS C908 65L 450104 7T 0 1UF 80 20 50V Y5V 1 PCS C920 65L517K102 5T6052 1000PF 10 Y5P...

Page 50: ...10A06 F10P06Q 1 PCS D912 93L 60236 FMB 26L 0 PCS M1L1730 8128 SCREW M3x8 2 PCS PARE NT NO 705L782KB34072 BACK COVER ASS Y 5L6012 1 LIFT RUBBER 1 PCS 12L 394 3 FOOT PORON 7 PCS 15L6069 1 BASE BRACKET 1...

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