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Acer

Service Manual

Chapter 3- CIRCUIT THEORY

1. Monitor Block Diagram

The LCD Monitor contains an interface board, and inverter/power/Audio board, keypad board and flat
panel. In Inverter/power/Audio board, power section su14V & +5V for Inverter/Audio and
Interface board used. The inverter section drives the backlight of panel and the DC-DC conversion. The
Audio section drives speaker (2 x1W).

Inverter/Power/Audio BD

(Including AC/DC Power

Supply , Inverter and
Audio)

Interface Board

Keypad BD

AC input

Range 100V~240V

Host computer

(DVI signal input)
OPTION

Host computer

(VGA signal input and
DDC)

Flat panel (LVDS interface) and CCFL

2. Interface BOARD DIAGRAM

MCU

SCL

SDA

DDC

Interface Board

Red
Green
Blue

Vsync
Hsync

A/D
&

Scaling

&
OSD

To
LCD
module

EEP

R

O

M

5

«
...
4
5
6
7
8
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Содержание P221W

Страница 1: ...Acer Service Manual Service Manual LCD Monitor Acer P221W P223W 0 ...

Страница 2: ...lease Copyright Copyright 2006 InnoLux Tech Corp Ltd All Rights Reserved This manual may not in whole or in part be copied Photocopied reproduced translated or converted to any electronic or machine readable form without prior written permission of InnoLux Tech Corp Ltd Acer P221W P223W Service Manual ...

Страница 3: ...ERVATION DISTANCE 12 1 5 KEY FUNCTION DESCRIPTION 12 1 6 BURN IN AGING PATTERN 13 1 7 WARM UP 13 2 INPUT SIGNAL 13 2 1 VIDEO SIGNAL INPUT 13 3 FUNCTION CHECK 14 3 1 OSD FUNCTION TEST 14 3 2 SCREEN PICTURE CHECK 15 3 3 AUTO COLOR BALANCE 15 3 4 TIMING CHECK 15 3 5 POWER CONSUMPTION FUNCTION TEST 15 3 6 VGACABLE DETECT TEST 15 3 7 HI POT TEST 15 3 8 GROUNDING TEST 15 3 9 BUMPING TEST 15 4 DISPLAY CH...

Страница 4: ... wet unplug the power cable immediately and consult your closed dealer z Always unplug the monitor before cleaning it Clean the cabinet with a clean dry cloth Apply non ammonia based cleaner onto the cloth not directly onto the class screen z Do not place heavy objects on the monitor or power cord 2 PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety visu...

Страница 5: ...PMENT REQUIRED 1 SIGNAL GENERATOR 2 MULTIMETER 3 SCREW DRIVER 4 OSCILLOSCOPE 5 Soldering IRON 6 SOLDER 7 VGA Cable 15pins point to point 8 DVI Cable DVI D 24 1 pin 9 Audio cable 10 Color Analyzer 11 Myson412 ISP Board 12 EDID Board 13 EDID program file ...

Страница 6: ...d The inverter section drives the backlight of panel and the DC DC conversion The Audio section drives speaker 2 x1W Inverter Power Audio BD Including AC DC Power Supply Inverter and Audio Interface Board Keypad BD AC input Range 100V 240V Host computer DVI signal input OPTION Host computer VGA signal input and DDC Flat panel LVDS interface and CCFL 2 Interface BOARD DIAGRAM MCU SCL SDA DDC Interf...

Страница 7: ... ZD802 This will prevent MOSFET which built in IC802 from being damaged under large current impulse and voltage spike D806 and C815 to provide internal Auxiliary current to CONTROL pin during normal operation Otherwise error amplifier and feedback current input the CONTROL pin for duty cycle control 3 1 3 DC_5V and DC_14V Output Circuit For DC 5V D805 is used to rectify the inducted current R806 a...

Страница 8: ...2120 1 sends out a high potential LED amber off and then U102 RTD2120 48 sends out a low potential LED green on b When in Suspend mode U102 RTD2120 1 sends out a low potential via R106 flow to CN901 4 on keypad LED amber on 3 2 3 Realtek CHIP U103 RTD2553VH U102 RTD2120 U103 RTD2553VH 73 82 output 8 bit even LVDS digital data to panel control circuit through CN105 U103 RTD2553VH 85 94 output 8 bit...

Страница 9: ...SEN reaches 3 0V the output voltage is regulated If no current is sensed approximately 1 5 seconds IC501 shunt off The current flowing through CCFL is sensed and regulated through sense resistor R509 R511 The feedback voltage through R506 R507 C508 connected to Pin11 ISEN then compared with a reference voltage 1 5V via a current amplifier resulting in PWM drive outputs to full bridge switches 4 2 ...

Страница 10: ...Acer Service Manual Chapter 4 Disassembly Assembly 1 Exploded Diagram 9 ...

Страница 11: ...ASSYBACK COVER ASSY STAND SCREW F CROSS M4 8 BLK NL ROHS NYLOK 4 ASSY FRONT BEZEL ASSY PANEL UNIT Aluminium Foil RIGHT 1 Aluminium Foil LEFT 1 ASSYCHASSIS 1 PCBA I F BOARD 1 PCBA INV DC DC 1 HRN ASS Y 8P KEY PAD 1 CABLE 30P FFC 1 Foil 60 35 T0 07 1 BOLT 4 40x11 8 Ni ROHS 2FORW ODVI 4FORW DVI M3 5 Ni ROHS 4 P W WAS SCREW P CROSS W W SPR M3 6 Zn ROHS 1 GASKET 1 HINGE COVER_L 1 HINGE COVER_R 1 FRONT ...

Страница 12: ...H S NYLOK 4 ASSYBACK COVER 1 ASSY PANEL 1 Aluminium Foil RIGHT 1 Aluminium Foil LEFT 1 ASSY BEZEL 1 LE 2284 LCD Monitor BEZEL 1 BUTTON 1 LENS 1 ASSY CHASSIS 1 KEY PAD 1 HRN ASS Y 8P 1 HINGE 1 STAND FRONT 1 STAND REAR 1 SCREW P CROSS T T 4 12 3 ASSY ASSY BASE BASE 1 BASE RELEASE BUTTON LE 1983 1 RUBBER FOOT 5 PLATE BASE 1 SCREW F CROSS T4 6 Zn RO HS 6 SCREW F CROSS T4 10 Zn ROHS 4 HINGE COVER_L 1 H...

Страница 13: ... un displays press AUTO to perform auto adjustment B When OSD displays press AUTO to return to previous level menu C When e Color OSD OSD displays press AUTO to exit the OSD MENU A When OSD isn t shown on screen press MENU to enter OSD interface The OSD interface uses ACER eColor Management and User to instead Contrast and Brightness separately When press ACER eColor Management to show e Color OSD...

Страница 14: ...k and 700mV is the maximum signal amplitude Input impedance of video pins is 75 ohm 1 Sync signal input The capability of sync signal inputs shall include separate sync Input impedance 2k2 ohms the signals are defined as follow Separate sync TTL level Positive Negative 2 1 2 Input signal mode PRESET TEST MODE TIMING VESA MODES Horizontal Vertical Mode Resolution Total Nominal Frequency 0 5KHz Sync...

Страница 15: ...80 000 1152 870 75Hz 1456 915 68 681 N 75 062 N 100 00 Other MODES XGA 1024 768 72Hz 1360 800 57 669 N 72 086 N 78 434 SXGA 1280 1024 70Hz 1696 1072 74 882 P 69 853 P 127 000 2 1 3 VGA signal cable 15 pin D sub VGA connector of signal cable 2 1 4 Interface Analog signal The input signals are applied to display through D sub cable Length 1 8 m 50 mm fixed Connector type D sub male With DDC_2B pin a...

Страница 16: ...pattern pattern 41 of WHITE 3 5 3 Adjusting both brightness value to maximum 3 5 4 Measure power consumption as the following Status Power Consumption LED Display Normal 45W with audio Green Standby No H V sync 2W Orange Power off 1W No display 3 6 VGA Cable Detect Test If VGA cable of LCD monitor isn t connected to video pattern generator or PC NO SIGNAL should be shown on screen 3 7 Hi Pot test ...

Страница 17: ...lass II Defect Type Specification Major Minor Bright dot defect THD Dark dot defect THD Total bright and dark dots THD Bright Dots 2 Adjacent B THD Bright Dots 3 or more Adjacent THD Black Dots 2 Adjacent B THD Black Dots 3 or more Adjacent THD Distance between defect dots THD Distance between Dark dots THD Note 1 Dot defect is defined as the defective area is not larger than 50 of the dot area Br...

Страница 18: ...isplay non uniformity There should be non uniformity through 5 transparency of filter or judge by limit sample if necessary Scratch Dirt No harm Wrap No harm Bezel Sunken No harm No label Invert label Broken No Dirt Word can be read Not clear Word out of shape Mistake No Label Position Be attached on right position Not enough No Screw Limp No Connecto r Connection status No bend on pins and damage...

Страница 19: ...lyzer as the following Chromaticity Coordinate Mode x y 9300K 0 283 0 030 0 298 0 030 USER 6500K 0 313 0 030 0 329 0 030 5 3 Brightness Out Video signal input 700mV 2 5 3 1 Test mode 1680x1050 60 Hz 5 3 2 Test pattern pattern 41 of WHITE 5 3 3 Test tool Color Analyzer Chroma7120 Set brightness and contrast to be maximum with white pattern to measure the screen center the light output shall be BL c...

Страница 20: ...7 40 68 B0 4 36 00 DA 28 11 00 00 19 00 00 00 FD 00 38 4D 1F 5 54 11 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30 6 30 30 30 30 30 30 30 30 30 30 30 0A 00 00 00 FC 7 00 50 32 32 33 57 0A 20 20 20 20 20 20 20 00 EE 6 AUDIO CHECK 6 1 Audio Sound Check 6 1 1 1 Apply audio source of test program 1 voice LEFT and RIGHT 2 500mVrms sine wave that sweep from 200Hz to 20 KHz into audio input light blue it sho...

Страница 21: ...e about 1V Check primary rectifier voltage Check pin1 of IC802 voltage is 5 8V END Check circuit if short Check R812 R816 C818 Check R803 R807 R824 R825 Check R801 R805 R822 R823 R817 Check F801 F802 P801 D801 Check IC802 C805 T801 Check pin2 of IC802 voltage about 2V YES YES YES YES YES YES NO NO NO NO NO 20 ...

Страница 22: ...nge IC803 Change R810 R811 R818 Check pin3 of IC802 voltage about 1V Check R810 R811 R818 Check the C pin voltage of IC803 if 3V Check the R pin voltage of IC803 about 2 5V Check D806 C815 if short Check pin1 of IC802 voltage is 5 8V Check sam pling Circuit END Unstable power YES YES YES YES YES NO NO NO NO NO NO 21 ...

Страница 23: ...m om ent of restart C heck C N 501 C N 502 C N 503 and C N 504 Is there high level voltage on pin8 of IC 501 Is there 14Vdc voltage on pin13 of IC 501 U 501 U 502 fail C heck I F board C heck pow er supply R 526 open C onnecting the output connector again T501 T502 fail C heck protected circuit Q 501 Q 502 Q 503 Q 504 IC 501 fail Y ES Y ES Y ES Y ES Y ES Y ES Y ES Y ES NO NO NO NO NO NO NO Y ES Y ...

Страница 24: ... Enable pin46 of U102 Check crystal pin 15 16 waveform of U102 Check reset pin4 of U102 Check power supply for U102 Check power supply pin 1 2 of CN102 Check R123 Inverter Fail Check X101 C108 C109 Check C105 R113 Check D101 D105 Q104 Power fail NG NG NG NG NG NG YES YES YES YES YES YES 23 ...

Страница 25: ...Acer Service Manual 5 Bad Screen Check the pins of U103 Bad Screen Check Crystal pin15 16 of U102 Change LVDS Cable LVDS Cable Reinsert CheckX101 C108 C109 LVDS Cable NG Workmanship OK OK OK NG NG NG 24 ...

Страница 26: ...ite screen END Whitescreen Check LVDS signal Check Q114 Q112 Q113 Check Panel Enableof U102 pin39 Check VLCD is5V Change LVDSCable LVDSCable Reinsert Workmanship Panel Fail LVDScableNG U102Fail OK OK OK OK OK NG NG NG NG NG 25 ...

Страница 27: ...UL1571 28 HS 0 42 4530708002 PW 10R RD 16A 250V BLK 6FT VDE H0 1 1 1 R CO 5VV F 3G 2 1 4530303001 CA 20R P 6FT BLACK GREEN CP 1 1 BLE AUDIO 1 03B06P0 0 76 4530101003 CA 10R SUB 15P MALE 6FT BL 2 60 1 1 BLE D ACK BLUE ROH 4530303001 CA 80R MALE 6FT PC99 BLACK SA 4 43 1 1 BLE DVI D 18 1P 7140300117 AS 00R SY FRONT BEZEL LE2284 4 94 1 1 7140300118 ASSY FRONT BEZEL LE2291 00R 4 94 1 1 7140700115 00R A...

Страница 28: ...Acer Service Manual 27 Attachment 2 Schematic ...

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Страница 36: ...Acer Service Manual 35 ...

Страница 37: ...Acer Service Manual 36 Attachment 3 PCB Layout ...

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