Dell E157FPc User manual

15" LCD Color Monitor Dell E157FPc
1
Service
Service
Service
Horizontal Frequency
30kHzto63kHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
5.2.Software Flow Chart………..………………....….......20
5.3.Electrical Block Diagram………………..…..….......22
6. Mechanical Instruction..……….……….……………….24
7.Schematic Diagram………..................................….....29
7.1Main Board......………......................................29
7.2 Power Board……..…….……....................................34
8.PCB Layout..……...………….......................................36
8.1.Main Board……………..…........................................36
8.2.Power Board……………........................................38
8.3.Key Board………………….....................................40
9.Maintainability………….......................................41
9.1.Equipments and Tools Requirement..…….…...........41
9.2.Trouble Shooting………………….............................42
10.White-Balance, Luminance adjustment...………......48
11.ISP Instruction…………….…….................................50
12.Check List……………………………………………...56
13.BOM List………….....................................................59
14.Different Parts List……………………...……………...82
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Table Of Contents.......…….................……...........…........1
Revision List.….........................………................……......2
Important Safety Notice.….……….…..................……......3
1.Monitor Specifications.....…........................………........4
2.LCD Monitor Description…………………………….......5
3.Operation Instructions……………...............……...........6
3.1.General Instructions…………………………………….6
3.2.Control Buttons……………...............……...............6
3.3.On Screen Menu/Display (OSD)….......….……..........7
3.4 Adjusting the Picture...........…………….........………..8
4.Input/Output Specification.............……………........…13
4.1.Input Signal Connector............………….................13
4.2.Factory Preset Display Modes...…..…......................13
4.3.Power Supply Requirements..........……...................14
4.4.Panel Specification…….....……………..................15
4.5.Definition of Pixel Defects…………...............……….16
5.Block Diagram…….…...................…………................19
5.1.Monitor Exploded View…………….…………............19

15" LCD Color Monitor Dell E157FPc
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Revision List
Revision Release Date Revise history TPV model
A00 Jun.-26-2006 Initial Release T56SGDHKDQDZNP
A01 Jul.-07-2006 Add TPV model in Item 13 T56CGDHKDQDFNCP
T56AGDHKDQDFNCP
A02 Jul.-21-2006 Add TPV model in Item 13 T56GGDHKDQDFNCP
T56SGDHKDQDZNCP
T56CGDHLDQDFNCP
A03 Aug.-17-2006 Add TPV model in Item 13
T56AGDHMDQDLNCP
A04 Aug.-23-2006 Add TPV model in Item 13 T56SGDHMDQDRNCP
T56SGDHMDQDZNCP
A05 Sep-11-2006 Add TPV model in Item 13 T56AGDHBDQDFNCP
T56CGDHMDQDLNCP
T56GGDHBDQDFNCP
A06 Oct-14-2006 Add TPV model in Item 13
T56AGDHMDQDFNCP
T56GGDHMDQDLNCP
A07 Nov.-14-2006
Add TPV model in Item 12 and
item13 T56SGDHBDQDZNCP
T56GGDHMDQDFNCP
A08 Dec.-08-2006 Add TPV model in Item13 T56CGDHMDQDFNCP
A09 Mar.-30-2007
Add Mechanical Instruction in
item 6

15" LCD Color Monitor Dell E157FPc
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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing
service operations. Some of these service operations require the use of tools specially designed for the purpose.
The special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read
in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICESARE
NOT EXHAUSTIVE.AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation.Accordingly, a servicer who uses a service procedure or tool which is not
recommended byAOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to asAOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create
shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission fromAOC.
AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open.AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION
OF THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth
may damage the panel.)

15" LCD Color Monitor Dell E157FPc
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1. Monitor Specifications
Screen type Active matrix - TFT LCD
Panel Type LTM150XO-L01
Size 380mm(15.0")
Pixel pitch 0.297mm(H) x 0.297mm(V)
Viewable angle 150(H) / 135(V) (type)
LCD Panel
Response time 16ms(type)
Video R, G, B Analog Interface
Separate Sync H/V TTL
H-Frequency 30kHz – 63kHz
Input
V-Frequency 55 - 75Hz
Display Colors 16.2M
Dot Clock 80MHz (Max.)
Max. Resolution 1024 x 768
Plug & Play VESA DDC
ON Mode <25W
EPA ENERGY
STAR®OFF Mode <2W
Input Connector D-Sub 15pin
Input Video Signal Analog:0. 7Vp-p(standard)
75 OHM, Positive
Maximum Screen Size Horizontal : 304.1mm
Vertical: 228.1mm
Power Source 100 V ~ 240 V± 10 %VAC, 50 ±3Hz, 60 ±3Hz
Environmental
Considerations
Operating Temp: 5° to 35°C
Operating Humidity: 10% to 80%
Storage Temp.: -20° to 60°C
Weight Weight with packaging: 5.1 kg

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2. LCD Monitor Description
The LCD monitor will contain a main board, power board, key board, which house the flat panel control logic,
brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board
chips each voltage.
Video signal, DDC
Power board
Flat Panel and
CCFL backlight
Main Board
Key board
RS232 Connector
For white balance
adjustment in factory
mode
CCFL Drive.
AC-IN
100-240V
Monitor Block Diagram
Host Computer

17" LCD Color Monitor Dell E157FPc
3. Operation instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the
monitor. By changing these settings, the picture can be adjusted to your personal preferences.
-The power cord should be connected.
-Connect the video cable from the monitor to the video card.
-Press the power button to turn on the monitor, the power indicator will light up.
3.2 Control Buttons
A
MENU
The 'MENU' button is used to open the on-screen display (OSD), select
function icons, exit from menus and sub-menus, and to exit the OSD.
B
Brightness/Contrast Hot Key
Use this button for direct access to the 'Brightness' and 'Contrast' control
menu.
B C -
And + buttons
Use these buttons to adjust (decrease/increase ranges) items in the OSD.
Note: you can activate automatic scroll feature by pressing
and holding either + or - button.
AMenu button BBrightness / Contrast Hotkey and - button
CAuto Adjust and + button DPower On/Off button with LED Indicator

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C
Auto Adjust
Use this button to activate automatic setup and adjustment. The following
dialog will appear on screen as the monitor self-adjusts to the current
input:
Auto Adjust In Progress
Auto Adjustment button allows the monitor to self-adjust to the
incoming video signal.After using 'Auto Adjustment', you can further tune
your monitor by using the 'Pixel Clock' and 'Phase' controls in the OSD.
Note: Auto Adjust will not occur if you press the button while
there are no active video input signals, or attached cables.
D
Power Button & Indicator
The green LED indicates the monitor is on and fully functional. An amber
LED indicates DPMS power save mode.
The Power button turns the monitor on and off.
3.3 On Screen Menu/Display (OSD)
Direct-Access Functions
Function Adjustment Method
Auto adjustment
Use this button to activate automatic setup and adjustment. The
following dialog will appear on screen as the monitor self-adjusts
to the current input:
Auto Adjust In Progress
Auto Adjustment button allows the monitor to self-adjust to
the incoming video signal.After using 'AutoAdjustment', you
can further tune your monitor by using the 'Pixel Clock' and
'Phase' controls in the OSD.
Note: Auto Adjust will not occur if you press the button
while there are no active video input signals, or attached
cables.
Brightness / Contrast
With the menu off, push button to display the 'Brightness'
and 'Contrast' adjustment menu. The 'Brightness' function
adjusts the luminance of the flat panel. Adjust 'Brightness' first,
then adjust 'Contrast' only if further adjustment is necessary."+"
increase 'brightness'; " - "decrease 'brightness'
The 'Contrast' function adjusts the degree of difference between
darkness and lightness on the display screen.
"+" increase the 'contrast'
"-" decrease the 'contrast'

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3.4 Adjusting the Picture
1. With the menu off, push the 'MENU' button to open the OSD system and display the main features menu.
AFunction icons
BMain Menu
CMenu icon
DSub-Menu name
EResolution
2. Push the - and + buttons to move between the function icons.As you move from one icon to another, the
function name is highlighted to reflect the function or group of functions (sub-menus) represented by that
icon. See the table below for a complete list of all the functions available for the monitor.
3. Push the 'MENU' button once to activate the highlighted function; Push -/+ to select the desired parameter,
push menu to enter the slide bar. Then use the - and + buttons, according to the indicators on the menu, to
make your changes.
4. Push the 'Menu' button once to return to the main menu to select another function or push the 'Menu'
button two or three times to exit from the OSD.

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Icon Menu Name
and sub-menus
Description
EXIT This is used to exit out of the 'Main menu'.
Positioning:
Horizontal
Vertical
'Positioning' moves the viewing area around on the monitor screen.
When making changes to either the 'Horizontal' or 'Vertical' settings, no changes will
occur to the size of the viewing area; the image will simply be shifted in response to your
selection/change.
Minimum is '0' (-). Maximum is '100' (+).
Image settings:
Auto Adjust Even though your computer system can recognize your new flat panel monitor on
startup, the 'AutoAdjustment' function will optimize the display settings for use with your
particular setup.
Note: In most cases, 'AutoAdjust' will produce the best image for your
configuration; this function can be directly access via Auto Adjustment
hotkey.
Pixel Clock The 'Phase' and 'Pixel Clock' adjustments allow you to more closely adjust your monitor
to your preference. These settings are accessed through the main OSD menu, by
selecting 'Image Settings'.
Use the - and + buttons to adjust away interference. Minimum: 0 ~ Maximum: 100

15" LCD Color Monitor Dell E157FPc
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Phase If satisfactory results are not obtained using the 'Phase' adjustment, use the 'Pixel Clock'
adjustment and then use 'Phase' again.
Note: This function may change the width of the display image. Use the
'Horizontal' function of the 'Position' menu to center the display image on the
screen.
Color Settings: 'Color Settings' adjusts the color temperature and saturation.
Normal Preset 'Normal Preset' is selected to obtain the default (factory) color settings.
Blue Preset 'Blue Preset' is selected to obtain a bluish tint. This color setting is typically used for text
based applications (Spreadsheets, Programming, Text Editors etc.).
Red Preset 'Red Preset' is selected to obtain a redder tint. This color setting is typically used for color
intensive applications (Photograph Image Editing, Multimedia, Movies etc.).

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User Preset 'User Preset': Use the plus and minus buttons to increase or decrease each of the three
colors (R, G, B) independently, in single digit increments, from '0' to '100'.
Note: 'Color temperature' is a measure of the 'warmth' of the image colors
(red/green/blue). The two available presets ('Blue' and 'Red') favor blue and red
accordingly. Select each one to see how each range suits your eye; or utilize the
'User Preset' option to customize the color settings to your exact choice.
OSD Settings: Each time the OSD opens, it displays in the same location on the screen. 'OSD Settings'
(horizontal/vertical) provides control over this location.
Horizontal
Position
-and + buttons move OSD to the left and right.
Vertical Position -and + buttons move OSD down and up.
OSD Hold Time: The OSD stays active for as long as it is in use.
'OSD Hold Time': Sets the length of time the OSD will remain active after the last time
you pressed a button.
Use the -and + buttons to adjust the slider in 5 second increments, from 5 to 60 seconds.
Note: Default 'OSD hold time' is 20 seconds.
OSD Lock 'OSD Lock': Controls user access to adjustments. When 'Yes' (+) is selected, no user
adjustments are allowed. All buttons are locked except the menu button.
All buttons can be locked or unlocked when the 'Menu' button is pushed and held for over
15 seconds.
Note: When the OSD is locked, pressing the 'Menu' button will take the user
directly to the 'OSD settings' menu, with 'OSD Lock' preselected on entry. Select
'No'(-) to unlock and allow user access to all applicable settings; or pressing the
'Menu' button for 15 seconds to unclock the OSD menu.

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Language: Language sets the OSD to display in one of five languages (English, Español, Français,
Deutsch, Japanese).
Note: The language chosen affects only the language of the OSD. It has no
effect on any software running on the computer.
Factory Reset:
'Factory Reset' returns the settings to the factory preset values for the selected group of
functions.
‘Exit’ is used to exit out of 'Factory Reset' menu.
For 'All settings', all user adjustable settings are reset at one time except 'Language
settings'.
OSD Warning Messages
A warning message may appear on the screen indicating that the monitor is out of sync.
Cannot Display This Video Mode
Optimum resolution 1024X768 60 Hz
This means that the monitor cannot synchronize with the signal that it is receiving from the computer. Either the
signal is too high or too low for the monitor to use. See Specifications for the Horizontal and Vertical frequency
ranges addressable by this monitor. Recommended mode is 1024 X 768 @ 60Hz.
Note: The floating 'Dell - self-test Feature Check' dialog will appear on-screen if the monitor cannot sense a
video signal.
Occasionally, no warning message appears, but the screen is blank. This could also indicate that the monitor is not
synchronizing with the computer. See Troubleshooting for more information.

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4. Input/Output Specification
4.1 Input Signal Connector
Pin NO. Description Pin NO. Description
1. Red Video 9. +5V
2. Green Video 10. Logic Ground
3. Blue Video 11. RXD
4. TXD 12. DDC-Serial Data
5. Detector Pin 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
VGA Connector layout
15
610
11 15
4.2 Factory Preset Display Modes
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
+/- 0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
VGA
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
XGA 1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
IBM MODES
Mode Resolution Total
Nominal
Frequency
+/- 0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
DOS 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322

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4.3 Power Supply Requirements
A/C Line voltage range 100 V ~ 240 V± 10 %
A/C Line frequency range 50 ±3Hz, 60 ±3Hz
Input Voltage transients 280 volts AC for 10 sec @40℃
Current 0.6A max, at 100V, 0.35A max, at 240 V
Peak surge current < 60Apeak at 240 VAC and cold starting
< 30A peak at 120VAC and cold starting
Leakage current < 3.5mA
Power line surge No advance effects (no loss of information or defect)
with a maximum of 1 half-wave missing per second

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4.4 Panel Specification
4.4.1 Display Characteristics (For LTM150XO-L01 panel)
4.4.2 Optical Characteristics (For LTM150XO-L01 panel)
Measured conditions as follows: Ta=25±2°C, VDD=3.3V,fv=60Hz,fDclk=65MHz,Llamp=8mA.

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4.5 Definition of Pixel Defects
For LTM150XO-L01 panel
4.5.1 Defect Modes
Dark / bright spots
Points on the display which appear dark / bright and remain unchanged in size
Dark / bright lines
Lines on the display which appear dark / bright and remain unchanged in size
Polarizer scratch
When the unit is lit a light, line is seen across a darker background; line does not vary in size
Polarizer dent
When the unit is lit a light, light(white) spots appear against a darker background, and do not vary in size
Bright/dark dot
A sub-pixel (R, G, B dot) stuck off / on
4.5.2 Mechanical Inspection
Chassis Gap max. 0.7mm
Light Leakage there shall be no visible light around the edges of the screen.
* If there is none identified criteria in this specification, Samsung will refer productionspecification that
Customer and Samsung agreed.
* If there is mechanical dimension issue which has no designated tolerance, Samsung will apply natural
tolerance.
[ D : diameter, W : width, L : length, N : count ]
*1 : Translucent edge is ignored in measuring the diameter of spot.

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4.5.3 Electrical Inspection
[L: length, N: count]
Definitions/ Notes;
- A bright dot any Red, Green, or Blue pixel suck in the “On” mode.
- A dark dot any Red, Green, or Blue pixel suck in the “Off ” mode.
- Inspection pattern for electrical defect should be pure R, G, B, Black and White.
- Adjacent two dots in horizontal direction will be considered as one dot.

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Fig. 2. Dark dot defect description
【two adjacent】
Fig. 3. Minimum distance between dot defects
【dark dot - to - dark dot】
* Minimum distance criteria is applied to the defect , which are not defined as adjacent dot(two or three) in the spec.
* Will not considered the distance between bright dot & dark dot.
* Will not considered the distance between dot & mechanical defect.
* A dot which is over the half (50%) of a dot size will be considered as one bright dot.

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5. Block Diagram
5.1 Monitor Exploded View

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5.2 Software Flow Chart
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N16
17
19
Y
N
18