Acer AL2623WX Schematic

Acer Service Manual

LCD Monitor Acer AL2623W

Service Manual

- 0 -

Service Manual Versions and Revision

No. Version Release Date Revision

1.0

2006/09/20

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 AL2623 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

1. FUNCTIONAL BLOCK DIAGRAM...............................................................................................................................................6

2. ELECTRONIC CIRCUIT THEORY ............................................................................................................................................... 5

3. INVERTER CIRCUIT THEORY-INL .............................................................................................................................................. 7

CHAPTER 4- DISASSEMBLY & ASSEMBLY ................................................................................................................................. 10

1. EXPLODED DIAGRAM ........................................................................................................................................................... 10

2. DISASSEMBLY BLOCK ........................................................................................................................................................... 11

3. ASSEMBLY BLOCK ................................................................................................................................................................ 12

CHAPTER 5- TEST AND ADJUSTMENT ........................................................................................................................................ 13

1. GENERAL POINTS ............................................................................................................................................................. 13

2. INPUT SIGNAL .................................................................................................................................................................. 14

3. FUNCTION CHECK........................................................................................................................................................... 16

4. DISPLAY CHECK............................................................................................................................................................... 17

5. PICTURE CHECK ............................................................................................................................................................... 18

CHAPTER 6- TROUBLE SHOOTING.............................................................................................................................................. 21

1. NO POWER & LED OFF ....................................................................................................................................................... 21

18VDC OUTPUT VOLTAGE IS UNSTABLE ................................................................................................................................. 22

3. 5VDC OUTPUT POWER IS UNSTABLE....................................................................................................................................... 23

4. 5VDC OUTPUT POWER IS UNSTABLE....................................................................................................................................... 24

5. AL2016W BACKLIGHT CAN'T BE TURNED ON(INL INVERTER)................................................................................................. 25

6. TROUBLESHOOTING LIST-TDK INVERTER ............................................................................................................................... 26

ATTACHMENT 1- BILL OF MATERIAL......................................................................................................................................... 27

ATTACHMENT 2- SCHEMATIC....................................................................................................................................................... 40

ATTACHMENT 3- PCB LAYOUT ..................................................................................................................................................... 49

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. Color Analyzer

9. Myson412 ISP Board

10. EDID Board

11. EDID program file

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 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(Including Inverter BD)

Power/Audio BD

(Including AC/DC Power

Supply and Audio)

AC input

Range 100V~240V

Interface Board (VGA input)

Keypad BD

Host computer

(VGA signal input and DDC)

Acer Service Manual

2. Interface BOARD DIAGRAM

Acer Service Manual

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. SW801 is hard switch for control AC input. C867/C802/C832/C866 are safety Y capacitors. C803/C804 are safety X capacitors. R801､

R802 and R803 joined between two inputting main circuit to discharge electric energy of C804 when power AC off. L801/L802 are used to clear up low frequency wave. High frequency waves are damped by C867 and C802. D801 is a rectifier build-in 4 diodes. It Transform AC to DC.

3.1.2 Power Factor Controller Circuit This circuit is typical boost model PWM power to improve power factor. T801 is inductor to

storage electric energy. T801 store energy when Q801 switch on. And T801 discharge energy when Q801 switched off. R804､R805､R806､R808､ZD802､R807､R822 and Q802 control

PFC output DC voltage. PFC output voltage is 400V when AC input is 180V~240V. Output voltage is 280V when AC input is 100~160V. R817､R818､R819 and R821 control PFC out

stabilization. The pin function of IC801 can find from component datasheet.

3.1.3 High DC Voltage to Low Voltage (5V) Control Circuit IC805 is this DC-DC circuit PWM controller. When pin6 of IC805 be charged to 12V, IC803 start drive Q805 to transform high DC voltage to low DC voltage 5V.D812､R865､Q806､

D814､C836 and C837 provide auxiliary power for IC803 normal operation. R862 and R861 sample from auxiliary winding to control over voltage protection for DC 5V output. R873 and

R872 sample DC 5V output voltage to compare voltage level with reference voltage of IC807. The signal get from compared result via IC806 feed back to pin2 of IC805. Then control PWM duty to control DC output stabilization. T803 is transformer. D815 is rectifier for DC 5V output. C843 and C844 are filter for DC 5V.

3.1.4 High DC Voltage to Low Voltage (24V) Control Circuit This circuit same section 3.1.3. IC802 is this DC-DC circuit PWM controller. When pin6 of

IC802 be charged to 12V, IC802 start drive Q803 to transform high DC voltage to low DC voltage 24V.D806､Q804､C818 and C815 provide auxiliary power for IC802 normal operation.

R832 and R831 sample from auxiliary winding to control over voltage protection for DC 24V output. R843､R851 and R842 sample DC 24V output voltage to compare voltage level with

reference voltage of IC804. The signal get from compared result via IC803 feed back to pin2 of IC802. Then control PWM duty to control DC output stabilization. T802 is transformer. D807 and D810 are rectifiers for DC 24V output. C825 and C826 are filter for DC 24V.

3.1.5 DC_24V Transform to DC 12V Circuit IC808 is this DC-DC circuit PWM controller. R883 is for output short protection. C854 adjust resonance frequency. R887 and R886 sample DC output 12V to feed back to pin5 of IC808. Then control duty width to drive Q807. L806 is storage inductor. C856 is filter.

3.1.6 Over Current Protect Circuit

IC811 is the OCP controller. R875､R876､R877､R878 and R879 are sample resistor for DC 5V output. When the voltage of IC808 pin9 higher than the pin8, pin14 output high level to via

D821､IC812 and IC809 control IC801 and IC802 shut down; R889､R890､R891､R892 and R893 are sample resistor for DC 12V output. When the voltage of IC808 pin7 higher than the

pin6,pin1 output high level to via D820､IC812 and IC809 control IC801 and IC802 shut down; R846､R845､R847､R848 and R849 are sample resistor for DC 24V output. When the voltage of IC808 pin5 higher than the pin4, pin2 output high level to via D809､IC812 and IC809 control IC801 and IC802 shut down;

3.1.7 Standby Power Controller Circuit

When standby power signal is high level, Q811 on, Q810 off, IC809 off, Q808 and Q812 off,

Q809 on, so power system on. When standby power signal is low level, Q811 off, Q810 on,

Acer Service Manual

IC809 on, Q808 and Q812 on, Q809 off, so IC801 and IC802 shut down. Power system off.

4. Power Consumption Function Test

4.1 Test mode: 1920x1200 @ 60 Hz

4.2 Test pattern: pattern #41 of “WHITE”

4.3 Adjusting both brightness value to maximum,

4.4 Measure power consumption as the following

Status Power Consumption LED Display

Normal < 130W(with audio) Green

Standby (No H/V

sync)

Power off < 1W No display

< 2W Orange

Acer Service Manual

Chapter 4- Disassembly & Assembly

1. Exploded Diagram

+ 21 hidden pages