Samsung Syncmaster 203b Service Manual

							Memo
10 Operating Instructions and Installation
10-6
 
						

							11 Disassembly and Reassembly
11-1
11 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the 203B TFT-LCD monitors.
WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling
these components.
11-1 Disassembly
Cautions: 1.Please the power off, before disassemble the monitor.
2.Please do not use other jig except given jig when disassemble.
3.Please disassemble based on given process as below.
4.Back cover open JIG : BH81-00001A
Description Picture Description
1. The monitor puts on the cushion  and 
remove two screws on VESA cover.
2. Pull up the VESA cover and remove it.
 
						

							11 Disassembly and Reassembly
11-2
Description Picture Description
3. Remove 1 screws from Lamp shield
4. Disconnect a FUNCTION Wire 
from PCB ASSY.
5. Disconnect  4  Lamp Wire and  Wire.
6. Disconnect a  LVDS Wire from  Panel.
 
						

							11  Disassembly and Reassembly
11-3
7. Remove 4 hexa screws from PBA board  which 
is connected PCB bracket.
8. Remove 4 screws from PBA board  and pull up 
the PBA from the bracket as picture.
9. Totally disassembled PBA board.
Description Picture Description
11-2 Reassembly
Reassembly procedures are in the reverse order of disassembly procedures.
 
						

							Memo
11 Disassembly and Reassembly
11-4
 
						

							13 Circuit Descriptions
13-1
13 Circuit Descriptions
13-1 Block description
 
						

							13 Circuit Descriptions
13-2
13-2 Block operating
No Feature Description
Scaler Integrate ADC and TMDS, Scaling part.
DDR memory Save frame information that SCALER needed .  
Microcontroller. 
Micom control all function of monitor.Scaler 
DDR 
MEMORY
MICOM 1
2
3
Analog signal from the PC is changed to digital signal using the A/D converter integrated in scaler(MST6281).
Scaler scale this digital singal to optimal signal fit to the panel and encode the LVDS signal. 
This LVDS signla enter the panel to show the image through the LVDS Connector.
In Case of DVI singal, integrated TMDS Block is operating and processing.
MIcom control the all function of the monitor and OSD.
DC/DC Block make a suitable voltages from output 14V of I/P board which are used for function of all
devices such as scaler, micom, memory, panel
IP board supplies voltages for main board and panel, at the same time, controls the lamp of panel back light. 
 
						

							- TFT-LCD
(Thin film Transistor Liquid Crystal Display)
ADC(Analog to Digital Converter) 
This is a circuit that converts from analog signal to
digital signals.
- PLL(Phase Locked Loop)
During progressing ADC, Device makes clock 
synchronizing HSYNC with Video clock  
- Inverter
Device that supplies Power to LCD panel lamp.
This device generates about 1,500~2,000V.
- SMPS(Switching Mode Power Supply)
Switching Mode Power supply. This design 
technology is used to step up/down the input
power by switching on/off
- FRC(Frame Rate Controller)
Technology that change image frame quantity 
displayed on screen for one second.
Actually TFT-LCD panel require 60 pcs of frame
for one second.
so,this technology is needed to convert input
image to 60 pcs regardless input frame quantity.
- Image Scaler
Technology that convert various input resolution to
other resolution.(ex. 640* 480 to 1024*768)
- Auto Configuration(Auto adjustment)
This is an algorithm to adjust monitor to optimum
condition by pushing one key.
- OSD(On Screen Display)
On screen display. customer can control the
screen easily with this.
- Image Lock
This means Fineness adjustment in LCD
Monitor, the features are Fine and Coarse - FINE
Fine adjustment is used to adjust visibility by
control phase difference.
- COARSE
This is a adjustment by tuning with Video colck
and PLL clock. 
- DVI (Digital Visual Interface)
This provides a high speed digital connection for
visual data types that is display technology  
independent. this interface is primarily forcused at
providing a connection between a computer and
its display device.
- L.V.D.S.(Low Voltage Differential Signaling)
a kind of transmission method for Digital.
It can be used from Main PBA to Panel.
- DVI (Digital Visual Interface)
This provides a high speed digital connection for
visual data types that is display technology 
independent. this interface is primarily forcused at
providing a connection between a computer and its
display device.
- T.M.D.S
(Transition minimized Differential Signaling)
a kind of transmission method for Digital. 
It can be used from Video card to Main PBA.
- DDC(Display data channel)
It is a communication method between Host
Computer and related equipment.
It can make it Plug and Play between PC and
Monitor.
- EDID
Extended Display Identification Data PC can 
recognize the monitor information as Product data,
Product name,Display mode,Serial number and
Signal source,etc through DDC Line 
communicating
with PC and Monitor. 14 Reference Infomation
14-1
14 Reference Infomation
14-1 Technical Terms
 
						

							14 Reference Infomation
14-2
- Dot Pitch
The image on a monitor is composed of red, green
and blue dots. The closer the dots, the higher the
resolution. The distance between two dots of the
same color is called the Dot Pitch. Unit: mm
- Vertical Frequency
The screen must be redrawn several times per
second in order to create and display an image for
the user. The frequency of this repetition per 
second is called Vertical Frequency or Refresh
Rate. Unit: Hz 
Example: If the same light repeats itself 60 times
per second, this is regarded as 60 Hz.  
- Horizontal Frequency
The time to scan one line connecting the right
edge to the left edge of the screen horizontally is
called Horizontal Cycle. The inverse number of the
Horizontal Cycle is called Horizontal Frequency.
Unit: kHz
- Interlace and Non-Interlace Methods
Showing the horizontal lines of the screen from the
top to the bottom in order is called the 
Non-Interlace method while showing odd lines and
then even lines in turn is called the Interlace
method. The Non-Interlace method is used for the
majority of monitors to ensure a clear image. The
Interlace method is the same as that used in TVs.
- Plug & Play 
This is a function that provides the best quality
screen for the user by allowing the computer and
the monitor to exchange information automatically.
This monitor follows the international standard
VESA DDC for the Plug & Play function.
- Resolution
The number of horizontal and vertical dots used to
compose the screen image is called resolution.
This number shows the accuracy of the display.
High resolution is good for performing multiple
tasks as more image information can be shown on
the screen. 
Example:  If the resolution is 1280 x 1024 , this
means the screen is composed of 1280 horizontal
dots (horizontal resolution) and 1024 vertical lines
(vertical resolution). 
- S-Video 
Short for Super Video. S-Video allows up to 800 lines
of horizontal resolution, enabling high-quality video.
- External Device Input 
External device input refers to video input from
such external video devices as VCRs, camcorders
and DVD players, separate from a TV broadcast. 
- DVD
A type of digital disk technology that takes up only
the benefits of CD and LD, to implement a high
resolution/quality, which enables the user to enjoy
clearer images. 
 
						

							- Connecting the Monitor
14 Reference Infomation
14-3
1.  Connect the DC adapter for your monitor to the power port on the back of the monitor. 
Plug the power cord for the monitor into a nearby outlet. 
2-1. Using the D-sub (Analog) connector on the video card. 
Connect the signal cable to the 15-pin, D-sub connector on the back of your monitor.
2-2. Using the DVI (Digital) connector on the video card.
Connect the DVI cable to the DVI port on the back of your monitor.
2-3. Connected to a Macintosh.
Connect the monitor to the Macintosh computer using the D-SUB connection cable. 
2-4. In the case of an old model Macintosh, you need to connect the monitor using a special Mac adapter. 
3.  Turn on your computer and monitor. If your monitor displays an image, installation is complete.
- You may get a blank screen depending on the type of video card you are using, if you connect 
simultaneously both the D-Sub and DVI cables to one computer. 
- If you properly connect your monitor using the DVI connector but get a blank screen, check to see if 
the monitor status is set to analog. Press power button to have the monitor double-check the input 
signal source.