Acer AT1935 User manual

Acer AT1935 LCD TV
ServiceGuide
PRINTED IN CHINA
Service guide files and updates are available on
the ACER/CSD web. For more information,
please refer to http://csd.acer.com.tw

Revision History
Please refer to the table below for the updates of LCD TV AT1935 service guide.
Date Chapter Updates
2007/11/1 Chapter 1 ~ 4 1st edition

Copyright
Copyright®2006 by Acer Incorporated. All rights reserved. No part of this publication may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language or computer
language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or
otherwise, without the prior written permission of Acer Incorporated.

Disclaimer
The information in this guide is subject to change without notice.
Acer Incorporated makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranties of merchantability or fitness for any particular
purpose. Any Acer Incorporated software described in this manual is sold or licensed “as is”. Should the
programs prove defective following their purchase, the buyer (and not Acer Incorporated, its distributor, or
its dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential
damages resulting from any defect in the software.
Acer is a registered trademark of Acer Incorporated.
Other brand and product names are trademarks and/or registered trademarks of their respective holders.

Conventions
The following conventions are used in this manual.
SCREEN MESSAGES Denotes actual messages that appear on screen.
NOTE Gives bits and pieces of additional information related to
the current topic.
WARNING Alerts you to any damage that might result from doing
or not doing specific actions.
CAUTION Gives precautionary measures to avoid possible
hardware or software problems.
IMPORTANT Reminds you to do specific actions relevant to the
accomplishment of procedures.

Preface
Before using this information and the product it supports, please read the following general information.
1. This Service Guide provides you with all technical information relating to the BASIC CONFIGURATION
decided for Acer's “global” product offering. To better fit local market requirements and enhance
product competitiveness, your regional office MAY have decided to extend the functionality of a machine
(e.g. add-on card, modem, or extra memory capability). These LOCALIZED FEATURES will NOT be
covered in this generic service guide. In such cases, please contact your regional offices or the
responsible personnel/channel to provide you with further technical details.
2. Please note WHEN ORDERING FRU PARTS, you should check the most up-to-date information available
on your regional web or channel. For whatever reason, if a part number change is made, it will not be
noted in the printed Service Guide. For ACER-AUTHORIZED SERVICE PROVIDERS, your Acer office may
have a DIFFERENT part number code to those given in the FRU list of this printed Service Guide. You
MUST use the list provided by your regional Acer office to order FRU parts for repair and service of
customer machines.

Chapter 1
System Specification
Specification
LCD Panel
Max. resolution: 1440 x 900
4 CCFTs Backlight system
Display area: 19 inches
Display color: 16.7 M colors (RGB 6Bits+HiFRC)
Input Signal: 2-ch LVDS
Contrast ratio: 800:1 ( Typical )
Brightness: 300 Cd/m² ( Typical )
Response Time: 5 ms ( Typical )
Viewing angle: 80° ( L ) / 80° ( R ), 80° ( U ) / 80° ( D )
I/O functions
21 pin Euro-SCART ( RGB ) for Video, S-Video, R.G.B. and Audio
RCA jack ( YUV and CVBS ) for YPbPr, YCbCr, Video and Audio
15 pin D-Sub for VGA
19 pin D-Sub for HDMI
DIN45325 ( IEC169-2 ) Terminal for TV / CATV input
3.5∮ Earphone jack for Audio Line input
3.5∮ Earphone jack for Headphone output
Video Functions
Support PAL / NTSC / SECAM video format
Support 480i/576i, 480p/576p, 1080i and 720p format
Build in Teletext functions
Build in Dynamic adaptive smoothing filter
Build in Dynamic temporal frame-filtering Noise Reduction
Build in Dynamic motion and edge adaptive De-interlacing
Film mode 3:2 & 2:2 pull down
Screen display mode Auto(Wide detect)/Full/16:9/4:3/Panorama/Letterbox1/2/3

Mechanical
VESA mounting holes
Compatibility
Multi-Sound system
NICAM
FM Stereo ( A2 )
Power Source
Input voltage: 90 ~ 264 V, 47 ~ 63 Hz
Input current: 220Vac/1A
Power consumption: 60 Watts
Stand-by: 1 Watts Max.
Remote controllers
Multi-function remote controller
Speaker
Internal speaker: 3 W x 2 stereo, volume adjustable
Others
On screen display adjustment function
ISP ( In System Programming ) function available for revising driver easily

System Block & Wiring Diagram
PC-RGB
SIF SIF
Y/C1
YPbPr-AV
BUFR
DAC Audio R/L
1440x900
PANEL
RGB
PC Audio
TS
FQD1216 MK5
PHILIPS
SCART-RGB Audio
HDMI
System Power
EARPHONE
+12V
VCC
INPUT
OUTPUT
Bidirectional
AudioOUT
ARd
FB
ARD
FB
Video OUT
MT5331
YPbPr-SCART
AV Audio
Audio IIS
SCART1-RGB
TMDS
ADC & DAC
Scaler
CVBS1
CVBS-AV
TI
MT8291
TV_CVBS
Amplifier
TPA3100D2
R
MT5131
DEMON
L
Dual LVDS

Remote Control

Key Functions
Remote Function description
R/C for Europe Key Functions
Remark (for
cardreader)
Power Power On/Off
Display Display Channel and Input Source
Mute Mute On/Off
TV TV Turner
SCART SCART
AV Composite/Component/HDMI
PC VGA
Sleep Sleep Timeer Off 15/30/45/60/90/120
Wide Scaling Mode ( Full/4:3 /16:9 /Panorama /Letterbox )
Menu Open Menu or leave Menu
Four way direction key
up Navigate up in the OSD or next (sub)page in teletext mode
down
Navigate down in the OSD or pevious (sub) page in teletext
mode
left Navigate left in the OSD
right Navigate right in the OSD
OK Selection Confirm
Channel key
1 Number key 1
2 Number key 2
3 Number key 3
4 Number key 4
5 Number key 5
6 Number key 6
7 Number key 7
8 Number key 8
9 Number key 9
0 Number key 0
Recall Return to previous channel
Enter Enter to confirm channel selection by number key
Channel UP Channel up
Channel Down Channel down
Volume key
NICAMMPX
STEREO Broadcast : Stereo/Mono

BILIGUAL Broadcast : Sound 1 / Sound 2
MONAURAL Broadcast: Mono
FM-FM
STEREO Broadcast: Stereo/Mono
BILINGUAL Broadcast : Sound 1 / Sound 2
Volume up Volume up
Volume down Volume down
Teletext Teletext on/off
Index Go to index page (usually page 100)
Subpage Enter/Leave subpage mode
Reveal Display Hidden Information
Temporarily holds the current teletext page if TEXT on
Hold Froze the picture if TEXT off
Zoom page toggle 1X/2X
Size Page select by Up-arrow and Down-arrow
Teletext Turn teletext mode on/off
Subtitle Show subtitle on the screen
R Colour button to operate the teletext
G Colour button to operate the teletext
Y Colour button to operate the teletext
C Colour button to operate the teletext

Hardware Specification and Configuration
Electro/Optical
Model AT1935
Panel specification
Resolution(pixels) 1440x900
Brightness(min.) 300 cd/m²
Contrast ratio(min.) 800:1(Typ.)
Display color 16.7 M
Viewing angle 160(H)/160(V)
Response(typ.) 5ms
Power supply
Input 90-264 V, 47-63 Hz
Max. power Consumption 60W
Power saving 1W
Mechanical
Dimensions(WxHxD mm) 612.29*814.44*261.45
Weight(Kg) N/A
Analog TV system
TV Color system DVB-T
TV Color system PAL.SECAM
Sound system B/G/D/K/I/L
Stereo system NICAM/ A2
Subtitle Teletext 1.5 (1000 pages)
Digital TV System
Digital TV standard DVB-T
ISO11172-3 layer1 & layer2Sound system
32KHz,44.1KHz,48KHz
Stereo system MPEG ( Layer I & II ) Stereo 32 / 44.1 / 48KHz
Teletext Yes
Subtitle Yes
EPG 7days EPG
Frequency 7/8 MHz
Video format 16bit YUV
Resolution SD(576i/480i)
Terminal
RF 75ΩDIN45325 ( IEC169-2 ) Type
SCART Euro-SCART ( RGB ) for Video, S-Video, RGB and Audio
Composite & Component RCA for YPbPr or Video and Audio R/L
HDMI HDMI connect for hdmi time and DVI mode

PC Analog Port D-Sub 15 pin VGA and 3.5∮Earphone jack for Audio
Headphone 3.5∮Earphone jack for Audio
Service Port ISP through D-Sub
Audio system
Speaker 3 W x 2
Firmware Specifications
Preset Mode for VGA Input
16 factory pre-set modes for VGA inputs are saved during the manufacturing process.
Please press "Volume-" + "Channel+" + "POWER" to enter the LCD TV factory mode.
Resolution Hor. Freq. (kHz) Vert. Freq. (Hz) Standard Format
1 640 x 350 31.5 70 VGA
2 720 x 400 31.5 70.1 VGA
3 640 x 480 31.5 59.9 VGA
4 640 x 480 35 66.7 MAC
5 640 x 480 37.9 72.8 VESA
6 640 x 480 37.5 75 VESA
7 640 x 480 43.3 85 VESA
8 800 x 600 35.2 56.3 VESA
9 800 x 600 37.9 60.3 VESA
10 800 x 600 48.1 72.2 VESA
11 800 x 600 46.9 75 VESA
12 800 x 600 53.7 85.1 VESA
13 832 x 624 49.7 74.6 MAC
14 1024 x 768 48.4 60 VESA
15 1024 x 768 56.5 70.1 VESA
16 1024 x 768 60 75 VESA
17 1280 x 768 47.8 59.9 VESA
18 1280 x 768 60.3 74.9 VESA
19 1280 x 720 45 59.9 VESA 16:09
20 1280 x 1024 64 60 VESA
21 1440 x 900 55.9 59.9 VESA 16:09
22 1440 x 900 70.6 75 VESA 16:09
This LCD TV would detect the used mode automatically.

Power Saving
While VGA is selected to be input, this LCD TV is equipped with a power-management according to VESA
DPMS. There is a delay of 30±2 seconds before the transition from On-state to power saving state to avoid
unintentionally entering of a power saving state during display resolution and timing mode changes. During
the period of delay, the LED shall indicate green color and OSD will show “ NO VGA CONNECTION “.
Transition from any power saving state to another can be instantaneous. The recovery from Off-state
requires no manual power on.
Mode Hsync Vsync Video Power Indication Recovery time
Power-On On On Active < 60W Green --
Stand-by Off On Off < 1W Red <10s
Suspend On Off Off < 1W Red <10s
Off-state Off Off Off < 1W Red <10s
Power off × × × < 1W Dark Turn on <10s
Sync on means: normal operation
Sync off means: Hsync: f < 1 KHz, duty cycle > 25 %, Vsync: f < 10 Hz, duty cycle > 25 %
The power-consumption is valid over the specified voltage and frequency range.
Power comsuption is measured from AC source.
There are no power saving modes for TV, SCART or HDMI or Composite or Component inputs.
Performance Specifications
The performance shall be check at 25oC environment.
White Balance and Uniformity
Set contrast and brightness at 50.
Adjustment Brightness min. 250 nits in all color temperatur.
The R, G, B gain could not exceed 512. (R, G, B could not saturation)
WhiteBalance(255/255) Dark Balance ( 60/255 )
COLD x 0.285 (+/-0.007); y 0.293 (+/-0.007) x 0.285 (+/-0.007); y 0.293 (+/-0.007)
STANDARD x 0.300 (+/-0.007); y 0.310 (+/-0.007) x 0.300 (+/-0.007); y 0.310 (+/-0.007)
WARM x 0.317 (+/-0.007); y 0.327 (+/-0.007) x 0.317 (+/-0.007); y 0.327 (+/-0.007)

Inspection tolerance for CF9E as below: Brightness 250 nits
WhiteBalance(255/255) DarkBalance(60/255)
COLD x 0.285 (+/-0.007); y 0.273 (+/-0.007) x 0.285 (+/-0.007); y 0.293 (+/-0.007)
STANDARD x 0.300 (+/-0.007); y 0.310 (+/-0.007) x 0.300 (+/-0.007); y 0.310 (+/-0.007)
WARM x 0.317 (+/-0.007); y 0.327 (+/-0.007) x 0.317 (+/-0.007); y 0.327(+/-0.007)
Display Area, Phase, Center and Tilt
Display Area: 19 inches diagonal
H-Phase: A-B Lessthan1.5mm
V-Center: C-D Lessthan1.5mm
Tilt: E-F Less than 1.5mm, but non-active area must be larger than zero for four sides
A
E
D
CF
B
Max. Brightness
The brightness should exceed 250 Cd/m2 while set both of contrast and brightness to max. and color
temperature of Standard is selected. ( Typical value would be 300 Cd/m2 ).
Power Supply Electrical Specifications
The power supply for this product is an internal converter, with a non-replaceable fuse internally.
This converter shall be well designed to meet CE mark requirement.
Input Voltage and Frequency Range
The operating range of line voltage shall be:
AC 90 volts to 264 volts, 47 Hz to 63 Hz
Power consumption shall be under 60 Watts
Variation of the line voltage throughout the applicable operating range shall not result in any visible image
anomalies such as image movement, changes in light output, nor changes in image stability or quality.

Line Fuse
The AC input shall be fused and become electrically open as a result of an unsafe current condition. This
fuse is inside the power supply converter and is not user replaceable, and must be returned for
replacement.
This fuse shall be well selected to handle inrush current for all combinations of line voltage and frequency.
Hot plug and power on/off sequence
Once hot plug occurs, at the very first time, the initial current should be limited at 2.3 amps or lower when
power offÆon. Current will stay below 500m amps at AC 240 volts while power onÆoff, then ramp up to full
power ( about 2.3 amps at AC 240 volts ) within 5 seconds when power-up signal is triggered. For the shut
down sequence, the current will stay at full power for about 150 m seconds or less, then ramp down to
500m amps at AC 240 volts within 1 second.
Power on LED Location and Type
Power on indicator shall be easily visible from the front of the display.
Inverter
The inverter which is used to light up back-light of LCD panel shall be well designed to meet requirement of
panel’s specification.
Overall Dimensions
Height: 612.29 mm
Width: 814.44 mm
Depth: 261.45 mm

Environmental Requirements
This display shall meet the following environmental requirements under normal operating conditions.

Operating
25° ± 5° for Purity, White Point, Mis-convergence, Luminance measurements and White uniformity
measurement
Operating temperature: 0°C to 35°C
Operating humidity: 10 % to 90 % ( non-condensing )
Storage and Shipping
Storage temperature: -20°C to 60°C
Shipping temperature: -20°C to 60°C
Storage humidity: 10 % to 90 % ( non-condensing )
Shipping humidity:10 % to 90 % ( non-condensing )
Altitude
Units tested at an altitude up to 12,000 feet must operate at normal conditions without exhibiting abnormal
behavior such as arcing or shutdown.
Operating altitude:0 to 12,000 feet
Shipping altitude: 0 to 40,000 feet
Storage altitude: 0 to 40,000 feet
Vibration Test
The packaged display shall be capable of passing sinusoidal vibration test as specified in follows.
Test condition as below:
Package sinusoidal vibration 7Hz, 1.05G acceleration, 20min/axe, 3axes
Random vibration,10-500 Hz, 1.47G RMS

The unit under test shall be run for a duration of 30 minute in each of following orientations :
Top and bottom side ( z axis ).
Left and right side ( x axis ).
Front and rear side ( y axis ).
The unit shall suffer no visible cosmetic damage and should operate no degradation indisplay quality after test.
Additionally, prior to production and prior to implementation of any design or manufacturing change that might affect
vibration performance, a minimum of 2 units shall be demonstrated to meet the requirements of specification.
Drop Test
The packaged display shall be capable of passing drop test as specified in following specification without any measurable
degradation in performance or detectable mechanical or cosmetic damage.
Dropping way: 1 corner, 3 edges, 6 flats
Dropping Height: follow the below table
Mass(kg) DropHeight(m)
----------------------------------------------------------------------------------
Surface Edge Corner
1~9KG 0.76 0.76 0.76
10~19KG 0.39 N/A N/A
20~29KG 0.36 N/A N/A
30~39KG 0.33 N/A N/A
40~49KG 0.3 N/A N/A
>=50KG 0.25 N/A N/A
Additionally, prior to production and prior to implementation of any design or manufacturing change that might affect
vibration performance, a minimum of 2 units shall be demonstrated to meet the requirements of specification.