Acer P221W, P223W Schematic

Acer Service Manual

Service Manual

LCD Monitor Acer

P221W/P223W

- 0 -

Service Manual Versions and Revision

No. Version Release Date Revision

1.0

2007/06/08

Initial Release

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

Acer Service Manual

Table of Contents

CHAPTER 1- PRECAUTIONS & SAFETY NOTICES ..................................................................................................................... 3

1. SAFETY PRECAUTIONS............................................................................................................................................................. 3

2. PRODUCT SAFETY NOTICE ...................................................................................................................................................... 3

3. SERVICE NOTES.......................................................................................................................................................................... 3

CHAPTER 2- SERVICE TOOLS & EQUIPMENT REQUIRED ..................................................................................................... 4

CHAPTER 3- CIRCUIT THEORY ...................................................................................................................................................... 5

2. INTERFACE BOARD DIAGRAM................................................................................................................................................... 5

3. ELECTRONIC CIRCUIT THEORY.......................................................................................................................................................... 6

CHAPTER 4- DISASSEMBLY & ASSEMBLY ...................................................................ERROR! BOOKMARK NOT DEFINED.

1. EXPLODED DIAGRAM ................................................................................................................ ERROR! BOOKMARK NOT DEFINED.

2. DISASSEMBLY BLOCK ............................................................................................................... ERROR! BOOKMARK NOT DEFINED.

3. ASSEMBLY BLOCK..................................................................................................................... ERROR! BOOKMARK NOT DEFINED.

CHAPTER 5- TEST AND ADJUSTMENT ........................................................................................................................................ 12

1. GENERAL POINTS............................................................................................................................................................... 12

1.1 TEST EQUIPMENT OR TOOL................................................................................................................................................ 12

1.2 PRESET TEST PATTERN ....................................................................................................................................................... 12

1.3 AC INPUT............................................................................................................................................................................. 12

1.4 OBSERVATION 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 VGA CABLE DETECT TEST................................................................................................................................................. 15

3.7 HI-POT TEST........................................................................................................................................................................ 15

3.8 GROUNDING TEST ............................................................................................................................................................... 15

3.9 BUMPING TEST .................................................................................................................................................................... 15

4. DISPLAY CHECK.................................................................................................................................................................. 15

4.1 PANEL FLICKER CHECK...................................................................................................................................................... 15

4.2 PANEL DEFECT INSPECTION ............................................................................................................................................... 16

5. PICTURE CHECK................................................................................................................................................................. 17

5.1 CHECK BRIGHTNESS UNIFORMITY...................................................................................................................................... 17

5.2 COLOR TEMPERATURE CHECK .......................................................................................................................................... 18

5.3 BRIGHTNESS OUT (VIDEO SIGNAL INPUT 700MV ± 2%).................................................................................................... 18

5.4 DDC DATA CHECK.............................................................................................................................................................. 18

6. AUDIO CHECK.......................................................................................................................................................................... 19

6.1 AUDIO SOUND CHECK......................................................................................................................................................... 19

6.2 AUDIO CONTROL TEST......................................................................................................................................................... 19

CHAPTER 6- TROUBLE SHOOTING.............................................................................................................................................. 20

ATTACHMENT 1- BILL OF MATERIAL......................................................................................................................................... 26

ATTACHMENT 2- SCHEMATIC....................................................................................................................................................... 27

ATTACHMENT 3- PCB LAYOUT ..................................................................................................................................................... 36

Acer Service Manual

Chapter 1- PRECAUTIONS & SAFETY NOTICES

1. SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper used or installation may cause damage to the monitor as well as to the user.

WARNINGS:

z This monitor should be operated only at the correct power sources indicated on the label on the rear

of the monitor. If you’re unsure of the power supply in you residence, consult your local dealer or Power Company.

z Do not try to repair the monitor by yourself, as it contains no user-serviceable parts. This monitor

should only be repaired by a qualified technician.

z Do not remove the monitor cabinet. There are high-voltage parts inside that may cause electric

shock to human bodies.

z Stop using the monitor if the cabinet is damaged. Have it checked by a service technician. z Put your monitor only in a lean, cool, dry environment. If it gets 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 visual inspections and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of substitute replacement parts, which do not have the same safety characteristics as specified in the parts list, may create shock, fire, or other hazards.

3. SERVICE NOTES

z When replacing parts or circuit boards, clamp the lead wires around terminals before soldering. z Keep wires away from high voltage, high temperature components and sharp edges. z Keep wires in their original position so as to reduce interference. z Adjustment of this product please refers to the user’ manual.

Acer Service Manual

Chapter 2- SERVICE TOOLS & EQUIPMENT 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

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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 supplies +14V & +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).

Flat panel (LVDS interface) and CCFL

Inverter/Power/Audio BD

(Including AC/DC Power

Supply , Inverter and Audio)

AC input

Range 100V~240V

2. Interface BOARD DIAGRAM

Interface Board

Keypad BD

Host computer

(DVI signal input) OPTION

Host computer

(VGA signal input and DDC)

Red Green Blue

A/D &

Scaling

Vsync

OSD

Hsync

SCL

MCU

EEPROM

SDA

DDC

To LCD module

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3. Electronic Circuit Theory

3.1 Switching Mode Power Supply

3.1.1 AC Current Input Circuit P801 is a connector for connecting AC Power. F801 is a fuse to protect all the circuit. AC input

voltage is from 90v to 264V. R820 and R821 joined between two inputting main circuit to prevent man from shock. L801 is used to clear up low frequency wave. C801 and C806 are used to discharge the waves that L801 produced. High frequency waves are damped by C801 and C806. D801 is a rectifier which composed of 4 build-in diodes, it inverts AC to DC.

3.1.2 High Voltage to Low Voltage Control Circuit C805 is used to smooth the wave from rectifier. IC802 is a highly integrated PWM controller which

build-in power MOSFET. When rectified DC high voltage is applied to the DRAIN pin during start-up, the MOSFET is initially off, and the CONTROL pin capacitor is charged through a switched high voltage current source connected internally between the DRAIN and CONTROL pins. When the CONTROL pin voltage Vc reaches approximately 5.8V, the control circuitry is activated and the soft-start begins. The soft-start circuit gradually increases the duty cycle of the MOSFET from zero to the maximum value over approximately 10ms. If no external feedback/supply current is fed into the CONTROL pin by the end of the soft-start, the high voltage current source is turned off and the CONTROL pin will start discharging in response to the supply current drawn by the control circuitry.

Resistor R803, R807, R824 and R825 are for line over voltage shutdown(OV) and line under-voltage

detection(UV).

Resistors R801, R805, R822, R823 are for external current limit adjustment. And used to reduce the current limit externally to a value close to the operating peak current of primary about 1.35A. The mean is power will protected when the primary current over about 1.35A.

When PWM is turned off, the main current flow will be consumed through D804, and 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 and C811 are used to store energy when current is reversed. The parts including C814, C814, C822, C821, B801 and L803 are used to smooth the current waves.

For DC 14V, D803 is used to rectify the inducted current. R802 and C802 are used to store energy when current is reversed. The parts including C808, C810 and L802 are used to smooth the current waves.

3.1.4 Feedback and OVP Protect Circuit

Pin R of IC803 is supplied 2.5-v stable voltage. It connects to 5V and 14V output through R811, R810 and R818. R811, R810 and R818 are output sampling resistor. When the sampling voltage more than 2.5V or less than 2.5V, current of FB IC802 will change, this can change the voltage from T801.

For 5VDC output OVP, ZD803 is a Zener Diode, when 5 voltage up to 5.6V, the zener current cause R819 voltage to ground is up to 0.7V, Q801 being triggered and OVP working. For 14VDC output OVP, ZD804 is a Zener Diode, when 14 voltage up to 18V, the Zener current cause R819 voltage to groung is up to 0.7V, Q801 being triggered and OVP working. The current of potential is used to make build-in diode light. Current of FB to IC802 will be changed, this can change the voltage from T801.

Q802, R827, R828 and ZD801 make up of dummy loading circuit. For start-up sequence, during 5V output take place high loading first, this dummy loading circuit operated to insure 14V not be increased.

3.2 I/F Board Circuit

3.2.1 RGB CAPTURE

- Signal RED,GREEN,BLUE input through CN103 #1,#2,#3, Stop DC via C110, C112 and C114, and then enter into U103 (RTD2553VH) analog input terminal #36,#33,#31, and then RTD2553VH deals with signal internally. EP106, EP107, EP108 are ESD protector to prevent U103 from ESD.

- Signal DDC_SCL (series clock) inputs via CN103#15, and then passes through EP101 for ESD

Acer Service Manual

protection, goes into U102(RTD2120) #5.

- Signal DDC_SDA (series data) inputs via CN103#12, and then passes through EP104 for ESD protection, goes into U102(RTD2120) #8.

- Signal TTL vertical sync. (Vsync) inputs via CN103 #14, and then clamped by EP102, passes through R164, and then goes into IC U103 (RTD2553VH) #40.

- Signal TTL horizontal sync. (Hsync) inputs via CN103 #13, and then clamped byEP103, passes through FB104,R166, and then goes into IC U103 (RTD2553VH) #39.

- CN103#5 is defined as cable detect pin, this detector realize passes through R159 Pull hight, go into

U102#24.

- U103 power is supplied by PC via CN103#9, or supplied by Monitor self.

- U105 is an EEPROM IC which is memory and OSD data saved in it.

.2.2 Buttons Control

- Button “Power” on right side bezel connects to U102(RTD2120) #9 through R105, via CN101#8.

- Button “Left” “Right “is ADC key,when press “Left” key, U102(RTD2120)#21 detect about

1.0~1.5V, then U102(RTD2120) know it is “Left” been pressed; when press “right” key, U102(RTD2120)#21 detect 0V, then U102(RTD2120) know it is “Right” been pressed;

“MENU” “AUTO” on left side bezel connects to U102(RTD2120) #14,#22 through R110,R201, via

CN101 #1, #3.

- LED Indicator on Front Bezel a. When press button “power”, U102(RTD2120) #1 sends out a low potential, via R106, flow to

CN901#4 on keypad, LED amber on until “ACER” logo over,then U102(RTD2120) #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 odd LVDS digital data to panel control circuit through

CN105.

- U102(RTD2120) #44 outputs Brightness “PWM” signals to control CCFL brightness.

- U102(RTD2120) #39 output PPWR ”H” potential to make Q114 conducted, and then make Q112

conducted, +5V flow to CN105#1~#3 as Panel VDD .

- U102(RTD2120) #46 output CCFL_ON/OFF ”L” or “H” potential to control Inverter on/off.

- TCLK by Crystal 24MHz input to U102(RTD2120) #15,#16.

Please refer to RTD2120 Pin Assignments table in page.

3.2.4 Regulator Circuit

- +5V is from switching mode power supply for Panel used.

- +3.3V generates from +5V through C102 and C104 filtering and U101 which is output +3.3V LDO for U102&U103 and U105 used.

- +1.8V generates from 3.3V through C101 and C103 filtering and Q106&Q107 which is output

+1.8V, for U103 used.

3.2.5 Audio circuit

- Audio Signal R,L,GND input through P701,#2,#5,#1, Stop DC via C704, C706, and then enter into U701 (TDA8496L) analog input terminal #5,#1.

- U701 (TDA8496L) #14,#12 output R,L audio data to Speaker through CN701.

- U102(RTD2120) #47 output MUTE “H” potential to control U701on/off.

- U102(RTD2120) #45 outputs Volume “PWM” signals to control U701 Volume.

4. Inverter circuit

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4.1 Low voltage to high voltage circuit

14VDC provides the power for IC501; the control signals Brightness and ON/OFF come from I/F

board. ON/OFF signal connect to pin8 of IC501 and makes IC501 enable. Brightness signal connect to pin7 of IC501 and regulates the panel brightness, R526, D515, R529, C505 make up a network of delaying time circuit and R523, R524 make up a divided voltage network, C504 is used to dump noise. The operation frequency is determined by the external Resistor R522 and capacitor C529 connected to pin5 of IC501. BURST MODE dimming pulse frequency and duty is regulated by I/F board. C503 is used for soft start and compensation, C502, C528 are used for dump noise.

The output drives, include NDR4, NDRV2, PDRV3, PDRV1 (pins1, 3, 15, 16 respectively) output square pulses to drive MOSFET U501, U502, and each of U501, U502 is consist of a N channel MOSFET and a P channel MOSFET. U501 and U502 work as full-bridge topology, it is high efficient, zero voltage switching.

During start up, VSEN (pin9) senses the voltage at the transformer secondary. When VSEN 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 Protection circuit

Over Voltage Protection: R501and R502 are connected in high voltage output connector, the divided AC voltage is inverted DC voltage through D508, R505 and C507are used to rectify wave & dump noise. Then the voltage signal reaches Pin9 VSEN of IC501, when the voltage changes, build-in PWM of IC501 will adjust output voltage.

Open Lamp Protection: In normal operation, the resistors R510, R511, R512, R509 are sensed a high level AC voltage, the AC signal OP1 invert DC voltage through D509, R515, C533, and the high level DC voltage reaches the gate pin of Q502, similarly, the gate pin of Q503, Q504, Q505 has high level DC voltage. So the gate pin of Q501 has a low level voltage, and the IC501 is normal operation. Once one of signal OP1, OP2, OP3, and OP4 is low, the voltages of Q501 gate pin is high level, and make the voltage of ISEN low level, the IC501 will be shunt down.

Acer Service Manual

Chapter 4- Disassembly & Assembly

1. Exploded Diagram

Acer Service Manual

2. Disassembly Block

LE 2284

LCD Monitor

HINGE *1 STAND-FRONT*1

ASSY, BASE BASE*1 BASE,RELEASE,BUTTON,LE1983*1 RUBBER FOOT *5 PLATE,BASE*1 SCREW,F,CROSS,T4*6,Zn,ROHS*6 SCREW,F,CROSS,T4*10,Zn,ROHS*4

HINGE COVER_L*1 HINGE COVER_R*1

ASSY FRONT BEZEL

STAND-REAR*1 SCREW,P,CROSS,T.T-4*12 *3

ASSY STAND SCREW,F,CROSS,M4*8,BLKNL ROHS(NYLOK)*4

FRONT BEZEL *1 BUTTON *1 LED LENS*1

ASSYCHASSIS *1 PCBA I/F BOARD *1 PCBA INV.&DC-DC *1 HRN ASS'Y 8P KEY PAD*1 CABLE 30P FFC*1

60*35*T0.07*1

Foil 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

Note:

ASSYBACK COVER

ASSY PANEL UNIT Aluminium Foil RIGHT*1 Aluminium Foil LEFT*1

BACK COVER *1 BACKCOVER,DECORA TE,COVER_L*1 BACKCOVER,DECORA TE,COVER_R*1 SPEAK*1

INNOLUX/

LCD PANEL 22"

The DIS assembly direction please following direction of arrowhead

Acer Service Manual

GE COV

3. Assembly Block

SCREW,P,CROSSW/W-SPR,M3*6,Zn,R

PCBA I/F BOARD *1 CABLE 30 PIN FFC SCREW,PW,CROSS,W/WAS, M3*5,NI*1 BOLT,#4-40x11.8,Ni ROHS *2FORW/ODVI(*4FORW/DVI) Foil GASKET*1

PCBA Power *1

SCREW PW,CROSS,W/WAS,

M3*5,NI*3

OHS*1

60*35*T0.07*1

ASSY BEZEL*1

ASSY PANEL*1

Aluminium Foil RIGHT*1 Aluminium Foil LEFT*1

BEZEL*1 BUTTON*1, LENS*1

INNOLUX/

LCD PANEL 22"

ASSY CHASSIS *1

CHASSIS *1 BRACKET

HINGE, *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, 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

ASSYBACK COVER*1

ASSY STAND*1

SCREW,F,CROSS,M4*8,BLK-NLROH

ASSY

BACK COVER *1 BACKCOVER,DECORA TE,COVER_L*1 BACKCOVER,DECORA TE,COVER_R*1 SPEAK*1

HINGE COVER_L*1 HIN

ER R*1

LE 2284

LCD Monitor

+ 25 hidden pages