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Acer Acer –LCD-A231H
Service Manual
LCD Monitor Acer A231H
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1 Table of Contents Important Safety Notice .........................................................................................02 01 Product Specification ..........................................................................................03 02 Flat Panel Specification .......................................................................................15 03 Exploded Diagram ..............................................................................................36
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Acer Acer –LCD-A231H Important Safety Notice 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. Warning: 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 powe
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Acer Acer –LCD-A231H 01 Product Specification 1. General: Acer A231H is designed with LVDS interface and VGA/DVI-D/HDMI(option) input, it featured with embedded universal AC power supplies and audio input. It’s a green product and meets all ROHS standard. The power button and display control buttons are on the front of the monitor. The monitors shall automatically to display lower resolution video modes into 1920
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Acer Acer –LCD-A231H 1.2 Accessories VGA DVI Audio User’s Quick-start Items Warranty card cable cable cable manual Guide Description 1.8m 1.8m 1.8m Multi Multi Multi Option 2. Operation Specifications The unit should suffer no visible cosmetic damage and should operate with no degradation in display quality during exposure to the operating conditions and after exposure to the non-operating conditions,
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Acer Acer –LCD-A231H 2.2 Safety, EMC, Ergonomics and Compatibility Requirements EMC Safety EMC&Safety Ergonomics Compatibility Windows 95/98/Me/2000/XP/VISTA/7 Energy Star 5.0 Power Management 2.3 Electrostatic Discharge Requirements Item Condition Spec Contact discharge: 4KV Electrostatic Contact discharge: 8KV ● IEC61000-4-2(EN55024) Discharge Air discharge : 8KV Air discharge : 15KV
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Acer Acer –LCD-A231H 3. Electrical and Optical Characteristics and Performance 3.1 Main Power Supply 3.1.1 Input characteristics Items Condition Spec Note AC Input Voltage range Universal input full range 90~264Vac AC Input Voltage rating Universal input full range 100~240Vac AC input frequency range 90~264Vac 47~63Hz AC input frequency rating 100~240Vac 50~60Hz AC Input Current 100Vac 1.5A(max) 240Vac
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Acer Acer –LCD-A231H OTP(Over temperature protection) Fuse protection Table-1 Status H-sync V-sync Video Power LED Power On on on active ≤55W Blue off on blanked < 1W Amber Power Saving on off blanked < 1W Amber off off blanked < 1W Amber Power Off -- -- -- < 1W Off 3.2 Backlight Power Supply Panel: LTM230HT02 Items Specification Lamp 4 CCFL Input Voltage 23.8---28V Input current 1.2A (Typ.), 1.4A (M
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Acer Acer –LCD-A231H 3.3 Brightness output The test to verify specifications in this section shall be performed under the following standard conditions unless otherwise noted. Temperature : 25 ± 5°C Test pattern : white Video Resolution : 1920 x 1080 Video input level : 700 mV ± 2% Warm-up time : 30 minutes Set brightness control and also contrast control at maximum, to measure the screen center, the ligh
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Acer Acer –LCD-A231H 3.5 Brightness uniformity The test standard conditions refer to Sec 3.3. Min. luminance of nine points (backlight) 75% Max. luminance of nine points (backlight) 4. Input / Output Signal Specifications 4.1 AC in 4.1.1 AC Input Voltage: 100~240VAC 4.1.2 AC Input Current: 1.2A @100Vac, 0.6A @240Vac 4.1.3 AC Frequency Range: 50~60Hz 4.2 Audio in (Option) 4.2.1 Input impedance 10K
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Acer Acer –LCD-A231H 6 TMDS Data1- 16 SDA 7 TMDS Data0+ 17 DDC/CEC Ground 8 TMDS Data0 shield 18 +5V Power 9 TMDS Data0- 19 Hot Plug Detect 10 TMDS Clock+ 4.4 DVI-D in DVI-D Connector Pin assignment: Pin Symbol Pin Symbol 1 TMDS Data 2- 16 Hot Plug Detect 2 TMDS Data 2+ 17 TMDS Data 0- 3 TMDS Data 2/4 shield 18 TMDS Data 0+ 4 N/C 19 TMDS Data 0/5 shield 5 N/C 20 N/C 6 DDC Clock 21 N/C 7 DDC Data 22
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Acer Acer –LCD-A231H 9 PC +3.3/+5V 10 Sync. Ground 11 N/C 12 DDC SDA 13 H sync 14 V sync 15 DDC SCL
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Acer Acer –LCD-A231H 4.5.2 Signal SPEC: Items Condition Specification Analog RGB signal Input impedance =75 Ohm 0.7Vp-p Sync Input impedance 1k Ohm TTL level, Separate H/V-sync(+/-) H-Sync Frequency 31K~83KHz V-Sync Frequency 56~76Hz 4.6 Timing table Resolution Resolution Horizontal Vertical Nominal Pixel Mode Write in EDID (active dot) (total dot) Frequency (KHz) Frequency (Hz) Clock (MHz) 640x480@60H
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Acer Acer –LCD-A231H 4.7 HDMI timing table(For HDMI Module) For DVD Player Input, Attached timing is supported : Mode Resolution Pixel Clock MHz H sync KHz V sync Hz VGA 640 x 480p 25.2 31.5 60 NTSC (480i) 4:3 720 x 480 13.50 15.73 60 NTSC (480i) 16:9 720 x 480 13.50 15.73 60 NTSC (480p) 4:3 720 x 480 27.00 31.47 60 NTSC (480p) 16:9 720 x 480 27.00 31.47 60 PAL (576i) 720 x 576 13.50 15.63 50 PAL (576p) 4:3 7
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Acer Acer –LCD-A231H 4.8 Audio output SPEC(For Audio Module) Specification Items TEST CONDITIONS Min TYP MAX Output power (W) 1.2 1.5 1.8 THD+N = 10% AT 1KHz 1Vrms Output impedance ( Ω) 3.4 4 4.6 AT 1KHz 1Vrms Po 2.0W Total harmonic distortion plus noise --- --- 10% Signal to noise ratio (dB) 40 --- --- THD+N 5% 200 250 300 PWM frequency (KHz) Note: The low pass RC Filter (R=100 Ω / C=0.047uF) for Cla
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Acer Acer –LCD-A231H 4.9.1 VGA EDID table 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 FF FF FF FF FF FF 00 04 72 C9 00 45 23 01 01 0 0A 14 01 03 08 33 1D 78 EA 60 85 A6 56 4A 9C 25 1 12 50 54 B3 0C 10 71 4F 81 00 81 80 95 00 D1 C0 2 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 3 45 00 FD 1E 11 00 00 1A 00 00 00 FC 00 50 32 33 4 36 48 0A 20 20 20 20 20 20 20 00 00 00 FD 00 38 5 4C 1F 53 12 00 0A 20 20 20 20 20 20 00
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Acer Acer –LCD-A231H 25 00 13 2A 21 00 00 9E 01 1D 00 BC 52 D0 1E 20 5 B8 28 55 40 13 2A 21 00 00 1E 01 1D 80 D0 72 1C 6 16 20 10 2C 25 80 13 2A 21 00 00 9E 00 00 00 FF 7
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Acer Acer –LCD-A231H 5. Function Specifications All the tests to verify specifications in this section shall be performed under the following standard conditions unless otherwise noted. The standard conditions are: Temperature : 25 ± 5°C Warm-up time : 30 minutes minimum Checking display modes : All the specified modes 5.1 Panel general specifications Item Describe Supplier SEC Model name LTM230HT02
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Acer Acer –LCD-A231H 5.2 Optical characteristic of LCD panel The test methods for the below items’ definition, please refer to the specification of INL MT230DW01 panel. Item Unit Conditions Min. Typ. Max. Remark Right 70 80 - [degree] HorizontalLeft 70 80 - Viewing Angle Up 70 80 - (CR >= 10) [degree] Vertical - Down 70 80 Normal Direction 600 1000 Contrast ratio [msec] Rising + Falling - 5 10
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Acer Acer –LCD-A231H [POWER] Power on or power off the monitor 5.3.2 Hot Key Operation HOT KEY OPERATION FUNCTION DESCRIPTION e Color AUTO MENU ◄ ► POWER Press [e], and then press [POWER] FACTORY for DC power on. OSD menu will be ● ON MODE shown with “F” on the left top. Select “F” for entering factory mode.
