文军维修
资料系列
SAMSUNG
COLOR MONITOR
SyncMaster 800TFT
SERVICE
COLOR MONITOR
Manual
CONTENTS
1. Precautions 2. Product Specifications 3. Disassembly & Reassembly 4. Alignments & Adjustments 5. Troubleshooting 6. Exploded View & Parts List 7. Electrical Parts List 8. Block Diagram 9. Wiring Diagram 10. Schematic Diagrams
Samsung Electronics Co., Ltd. September 1999 Printed in Korea Code No.: BN68-00049A
1 Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock.
1-1 Safety Precautions
1-1-1 Warnings
1. 2. For continued safety, do not attempt to modify the circuit board. Disconnect the AC power and DC power jack before servicing.
DEVICE UNDER TEST TEST ALL EXPOSED METAL SURFACES (READING SHOULD NOT BE ABOVE 0.5mA)
1-1-2 Servicing the LCD Monitor
1. 2. When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet. It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of this meter periodically.
LEAKAGE CURRENT TESTER
2-WIRE CORD
1-1-3 Fire and Shock Hazard
Before returning the monitor to the user, perform the following safety checks: 1. Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor. Inspect all protective devices such as nonmetallic control knobs; insulating materials; cabinet backs; adjustment and compartment covers or shields; isolation resistor-capacitor networks; mechanical insulators, etc. Leakage Current Hot Check (Figure 1-1): WARNING: Do not use an isolation transformer during this test. Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7). 4.
*ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)
EARTH GROUND
Figure 1-1. Leakage Current Test Circuit
With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.
2.
3.
1-1-4 Product Safety Notices
Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by ! on schematics and parts lists. A substitute replacement that does not have the same safety characteristics as the recommended replacement part may create shock, fire and / or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.
SyncMaster 800TFT
1-1
1 Precautions
1-2 Servicing Precautions
WARNING: Caution: Note: An electrolytic capacitor installed with the wrong polarity may explode. Before servicing units covered by this service manual, read and follow the Safety Precautions section of this manual. If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions.
1-2-1 General Servicing Precautions
1. Always unplug the unit’s AC power cord from the AC power source and disconnect the DC power jack before attempting to: (a) remove or reinstall any component or assembly. (b) disconnect PCB plugs or connectors. (c) connect a test component in parallel with an electrolytic capacitor. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position. After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the area around the serviced part has not been damaged. 4. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks). Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500 V) to the blades of the AC plug. The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm. 6. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.
5.
2.
3.
1-3 Electrostatically Sensitive Devices (ESD) Precautions
Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called Electrostatically Sensitive Devices (ESD). Examples of typical ESD components are integrated circuits and some field-effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor 6. Do not remove a replacement ESD from its components or assemblies, drain the electrostatic protective package until you are ready to install it. charge from your body by touching a known earth Most replacement ESDs are packaged with leads ground. Alternatively, wear a discharging wristthat are electrically shorted together by conductive strap device. To avoid a shock hazard, be sure to foam, aluminum foil or other conductive materials. remove the wrist strap before applying power to the monitor. 7. Immediately before removing the protective material from the leads of a replacement ESD, 2. After removing an ESD-equipped assembly, place it touch the protective material to the chassis or on a conductive surface such as aluminum foil to circuit assembly into which the device will be prevent accumulation of an electrostatic charge. installed. 3. Do not use freon-propelled chemicals. These can Caution: Be sure no power is applied to the generate electrical charges sufficient to damage chassis or circuit and observe all ESDs. 4. 5. Use only a grounded-tip soldering iron to solder or desolder ESDs. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ESDs.
other safety precautions.
8. Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting your foot from a carpeted floor can generate enough static electricity to damage an ESD.
1-2
SyncMaster 800TFT
2 Product Specifications
2-1 Specifications
Item LCD Panel Scanning Frequency Display Colors Maximum Resolution Input Video Signal Input Sync Signal Maximum Pixel Clock rate Active Display Horizontal/Vertical Description TFT-LCD panel, RGB vertical stripe, normally white transmissive, 18-Inch viewable, 0.28 mm pixel pitch Horizontal : 30 kHz to 81 kHz (Automatic) Vertical : 56 Hz to 85 Hz (~XGA), 76 Hz (SXGA) 16.7 Million colors Horizontal : 1280 Pixels @ 81 kHz Vertical : 1024 Pixels @ 76 Hz Analog, 0.714 Vp-p ± 5% positive at 75 ?, internally terminated Type: Level: Seperate H/V sync, Composite H/V, Sync-on-Green TTL level (V high ≥ 2.0 V, V low ≤ 0.8 V), Sync-on-Green (≤ –0.25 V)
135 MHz 359 ± 3 mm / 287.2 ± 3 mm
AC power voltage & Frequency AC 90 to 264 Volts, 60/50 Hz ± 3 Hz Power Consumption Dimensions Unit (W x D x H) Carton (W x D x H) Weight (Net/Gross) Environmental Considerations 42 W (max.), 40W (norminal)
17.7 x 18.2 x 7.2 Inches (449.4 x 461.2 x 182 mm) 22.4 x 11.6 x 22.8 Inches (570 x 295 x 580 mm) 8.3 kg (18.28 lbs) / 11.8 kg ( 20.0 lbs) Operating Temperature : 50°F to 104°F (10°C to 35°C) Humidity : 10 % to 80 % Storage Temperature : -68°F to 113°F (-20°C to 45°C) Humidity : 5 % to 95 %
? SyncMaster 800TFT complies with SWEDAC (MPR II) recommendations for reduced electromagnetic fields. ? Designs and specifications are subject to change without prior notice.
SyncMaster 800TFT
2-1
2 Product Specifications
2-2 Pin Assignments
Sync Type Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 13W3 A1 A2 A3 4 4 A1-GND A2-GND A3-GND 3, 8 10 4 6 5 7 1, 2 15-Pin D-Sub & 13W3 Signal Cable Connector Separate Red Green Blue GND DDC Return (GND) GND-R GND-G GND-B No Connection Self Raster GND Bi-Dr Data (SDA) H-Sync V-Sync DDC Clock (SCL) Composite Red Green Blue GND DDC Return (GND) GND-R GND-G GND-B No Connection Self Raster GND Bi-Dr Data (SDA) H/V-Sync Not Used DDC Clock (SCL) Sync-on-green Red Green + H/V Sync Blue GND DDC Return (GND) GND-R GND-G GND-B No Connection Self Raster GND Bi-Dr Data (SDA) Not Used Not Used DDC Clock (SCL)
2-2
SyncMaster 800TFT
2 Product Specifications
2-3 Timing Chart
This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals. Table 2-1. Timing Chart Mode IBM
VGA2/ 70 Hz VGA3/ 60 Hz
VESA
640/75 Hz 640/85 Hz 800/75 Hz 800/85 Hz 1024/60Hz 1024/75Hz 1024/85Hz 1280/76Hz 1280/75Hz 640 x 480 640 x 480 800 x 600 800 x 600 1024 x 768 1024 x 768 1024x768 1280x1024 1280x1024
Timing
720 x 400 640 x 480
fH (kHz) 31.469 A μsec B μsec C μsec D μsec E μsec fV (Hz) O msec P msec Q msec R msec S msec Clock Freq. (MHz) 31.777 3.813 1.589 26.058 0.318 70.087 14.268 0.064 0.858 13.155 0.191 28.322
31.469 31.778 3.813 1.589 26.058 0.318 59.940 16.683 0.064 0.794 15.761 0.064 25.175
37.500 26.667 2.032 3.810 20.317 0.508 75.000 13.333 0.080 0.427 12.800 0.027 31.500
43.269 23.111 1.556 2.222 17.778 1.556 85.008 11.764 0.671 0.578 11.093 0.023 49.500
46.875 21.333 1.616 3.232 16.162 0.323 75.000 13.333 0.064 0.448 12.800 0.021 49.500
53.674 18.631 1.138 2.702 14.222 0.569 85.061 11.756 0.056 0.503 11.179 0.019 56.250
48.363 20.677 2.092 2.462 15.754 0.369 60.004 16.666 0.124 0.600 15.880 0.062 75.000
60.023 16.660 1.219 2.235 13.003 0.203 75.029 13.328 0.050 0.466 12.795 0.017 78.750
68.677 14.561 1.016 2.201 10.836 0.508 84.997 11.765 0.044 0.524 11.183 0.015 94.500
81.129 16.640 6.400 2.880
79.976 12.504 1.067 1.837 9.481
3.200 76.106 10.660 0.080 3.200
0.119 75.025 13.329 0.038 0.475 12.804
0.020 135.000
0.013 135.000
Polarity H.Sync Negative Negative Negative Negative Positive V.Sync Positive Negative Negative Negative Positive
Positive Negative Positive Positive Negative Positive
Positive Negative Positive Negative Com.
Positive Positive Separate
Remark Separate Separate Separate Separate Separate Separate Separate Separate Separate Separate Sync
Horizontal
Video Video
CC
H/V Composite Sync
A Q Vertical P
RR S S
VIDEO R
S
Vertical
Video Video DD E E
Q
Horizontal B
O
Q
Sync-on-Green
Sync Sync B B AA Sync Sync
Vertical
PP
O O
Green Horizontal P B Q O R S
A : Line time total C : Back porch E : Front porch SyncMaster 800TFT
B : Horizontal sync width D : Active time
O : Frame time total Q : Back porch S : Front porch
P : Vertical sync width R : Active time
2-3
2 Product Specifications
Memo
2-4
SyncMaster 800TFT
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the SyncMaster 800TFT TFT-LCD monitor. WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling these components.
3-1 Disassembly
Cautions:1. Disconnect the monitor from the power source before disassembly. 2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.
3-1-1 Removing the Stand
1. Remove 4 screws on the Stand.
7. Disconnect the Function PCB wire (10P) between the Function PCB and the CN102 connector on the Main PCB. 8. Disconnect 2 Inverter wires between the Panel and the CN2, CN3 connectors on the Inverter PCB. 9. Disconnect the 12P harness between CN1 connectors on the Inverter PCB and CN103 connector on the Main PCB. 10. Carefully lift the Main PCB Assembly and Inverter PCB and place them on a flat, level surface that is protected from static electricity. 11. Remove 10 screws on the PCB Bracket. 12. Remove the Bracket Assembly from the Front Cover. 13. Remove the 2 screws on the Function PCB from the Front Cover and remove the Function PCB and Function Knob.
3-1-2 Main Body Disassembly
1. Remove 4 screws on the Rear Cover. 2. Pull the Rear Cover up and off the monitor. 3. Remove 4 screws on the BRKT-VESA and Remove the BRKT-VESA. 4. Remove 16 screws on the PCB Shield and remove the Shield. 5. Remove 7 screws on the Main PCB and 2 screws on the Inverter PCB and 2 screws on the 10P Harness. 6. Disconnect the connector (140P) between the Panel and the CN600 connector on the Main PCB.
3-2 Reassembly
Reassembly procedures are in the reverse order of Disassembly procedures.
SyncMaster 800TFT
3-1
3 Disassembly and Reassembly
Memo
3-2
SyncMaster 800TFT
4 Alignments and Adjustments
This section of the service manual explains how to use the DDC JIG to adjust the black, red, green, and blue levels of the FPD when you replace the AD Board, and how to update the microprocessor when you change the Panel or Lamp(s).
4-1 Required Equipment
The following equipment is necessary for adjusting the monitor: ? Oscilloscope with probe tool ? Computer with Windows 95 R , Windows 98 R , or Windows NT R . ? DV18AS.exe software ? DDC Control JIG
4-2 Using the DDC Control JIG
After replacing the LCD Panel, Lamp(s), and / or AD Board, use the DDC Control JIG to complete your service. Attach the DDC Control JIG to the flat panel display (FPD) as shown in the diagrams, below.
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR PARALLEL CABLE PC SIGNAL GENERATOR SIGNAL CABLE
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR SIGNAL CABLE PARALLEL CABLE PC D-SUB CONNECTOR 3-WIRE CABLE
3-WIRE CABLE
Figure 4-1. Setup 1, With Signal Generator Figure 4-2. Setup 2, Without Signal Generator
SyncMaster 800TFT
4-1
4 Alignments and Adjustments
4-2-1
Main Menu
4-2-2 Sub Menu
4-2-2 (a) Panel Information
4-2-1 (a) Service JIG : DV18
a
1
2
3
4
5
6
7
b c d e g
l
m
n h i j o
8
9
15
10
11
12
13
14 f
16
17
18
k
Figure 4-3.Service JIG Menu
No
1 2 3 4 5 6 7
Figure 4-4. Control JIG Menu
No
a
Label Red max value Green max value Blue max value Red min value Green min value Blue min value Color Auto Adjustment Red gain control Green gain control Blue gain control Red cutoff control Blue cutoff control Panel information Scroll bar
Definition Shows the red video signal max value Shows the green video signal max value Shows the blue video signal max value Shows the red video signal min value Shows the green video signal min value Shows the blue video signal min value Automatical screen contrast setting Adjusts the red video signal gain control Adjusts the green video signal gain control Adjusts the blue video signal gain control Adjusts the red video signal cutoff control Adjusts the blue video signal cutoff control Shows the sub menu to panel information (4-2-2 (a)) Changes the value or level of the selected item. The window to the right shows the value as it changes. Saves the current adjustment value of the R,G,B video contrast gain and cutoff level Displays and allows you to adjust the PC and Control JIG communication environment. Use this button to change the Delay parameter and Port Address of your PC system and to test the connection between the Control JIG and your computer Quits the DDC Control JIG
Label
Definition
Monitor On Time Total hours that the monitor has been actively functioning. Panel Cycle Time The total number of times the Panel has been turned ON. Total in Hours that this Panel or Lamp has been ON. Reset this number to 000000 after replacing the part. Total number of hours that this Panel has been ON. Total number of hours that this Upper Lamp has been ON. Total number of hours that this Lower Lamp has been ON. The number of times this Panel or Lamp has been replaced. The numbers are 00 if the item is the original factory part installed during manufacture of this monitor. Replacement times. This value is 00 if original equipment. Replacement times. This value is 00 if original equipment. Replacement times. This value is 00 if original equipment. Shows the message. Reads all Panel information data from the AD Board Writes the Panel Parameter Control values to the AD Board Reload the Panel Parameter Control values from the Program buffer Returns to the Main menu
b
c
d
Panel Lamp, Upper Lamp, Lower Change No.
8 9
10 11 12 13 14
e
f
Green cutoff control Adjusts the green video signal cutoff control
g
h
Panel Lamp, Upper Lamp, Lower Message Read Write Read buffer Return Main
15
i
16
SAVE
j
k l
17
Setting
m
n
18
Exit
o
4-2
SyncMaster 800TFT
4 Alignments and Adjustments
4-2-3 Adjustment Procedures
Use the following procedures whenever you replace the AD Board, Panel, or one or both of the Lamps. 4-2-3 (a) When Replacing the AD Board 1. Before replacing the AD Board, read all Panel information data by using the Read button on the DDC Control JIG. 2. Remove the old AD Board and replace it with a new board. 3. Perform the procedures described in section 4-2-3 (b). 4. Write the Panel information data to the new AD Board by using the Write button. 5. Perform other procedures using the DDC Control JIG, if necessary. 6. When all procedures are complete, select the Exit button ( 18 ) to quit the DDC Control JIG software. 4-2-3 (b) Color Auto Adjustment 1. After displaying 16-Gray pattern or black and white mixed pattern, click “Color Auto Adjustment” button. 2. During normal execution of Auto Algorithm the screen image may flicker. If Auto Algorithm does not excute properly, check DDC Control JIG. 3. After normal execution of Auto Algorithm, confirm optimal settings by observing the contrast of several different patterns on the display. 4. If you want to check each color value, click the button from 1 to 6 and from 8 to 13
4-2-3 (c) When Replacing the Panel 1. Select the Read Buffer button ( n ) to gather the current information about this monitor. 2. Increment the number by clicking on the (+) button on the Panel row in the Change No. column. If they were not already 00, the numbers for the Upper and Lower Lamps will automatically change to 00. 3. Check all values. If there is an error, select Read Buffer again and increment the Change No. column to the correct number. When all values are correct, select the Write button ( m ) to record the data in the firmware. 4. Select the Return Menu button ( Main Menu.
o
) to Return
4-2-3 (d) When Replacing the Upper and/or Lower Lamp 1. Select the Read Buffer button ( n ) to gather current information about this monitor. 2. Increment the number by clicking on the (+) button on the Lamp Upper and/or Lamp Lower row in the Change No. column. 3. Check all values. If there is an error, select Read Buffer again and increment the Change No. column to the correct number(s). When all values are correct, select the Write button ( m ) to record the data in the firmware. 4. Select the Return Menu button ( Main Menu.
o
) to Return
SyncMaster 800TFT
4-3
4 Alignments and Adjustments
4-3 Using the OSD Service function
After replacement of the LCD Panel or Lamp(s), use the 800TFT’s OSD Service Function to complete your service. 1. To display the Service Function OSD, push and hold in for 8 seconds the Left and Right arrow buttons on the front panel of the monitor. 2. If the Panel has been replaced during this servicing, use the Up or Down arrow button on the front panel to highlight the Panel row on the table. Increment the Change No. value by pushing and holding in (for 8 seconds) the Left and Right arrow buttons on the front panel. Incrementing the Panel value automatically changes both the Upper and Lower Lamp Change No. value to 00. If you have changed the Upper and/or Lower Lamp(s) without changing the Panel, highlight the appropriate row(s) then push and hold in (for 5 seconds) both the Left and Right arrow buttons on the front panel. This action increments the Change No. value(s). Note: Increment the Lamp value(s) only if one or both of them were replaced, but the Lamp was not replaced. 3. After incrementing the appropriate values, power off the monitor.
Service Function Monitor On Time : 000049Hr Panel Cycle : 000088 Time Change No. Panel : 000050Hr 00 Lamp Upper : 000050Hr 00 Lamp Lower : 000050Hr 00
Figure 4-5. Service Function Menu Screen
4-4
SyncMaster 800TFT
4 Alignments and Adjustments
SyncMaster 800TFT
4-5
5 Troubleshooting
Notes: 1. Before troubleshooting, set up the PC’s display as below. ? Resolution: 1280 x 1024 ? H-frequency: 64 kHz ? V-frequency: 60 Hz 2. If no picture appears, confirm the power cord is correctly connected. 3. Check the following circuits. ? No raster appears: Stand PCB, Main PCB ? 14V develop but no screen: Main PCB ? 14V does not develop: Main PCB 4. If you push and hold the EXIT button for more than 5 seconds, the monitor automatically reverts back to the factory preset
5-1 No Power
Does proper DC 14 V appear at DC jack connected to CN101? Yes Does proper DC 5 V appear at Pin 4 of IC101? Yes Does proper 5 V - signal appear at Pin 42 of IC501 (SW_REG_EN)? Yes Check Q103, Q105 and Q106.
No
Check Power Adaptor.
No
Check IC101 and related circuit.
No
Check IC501 and related circuit. (CN102, Function Key)
SyncMaster 800TFT
5-1
5 Troubleshooting
5-2 No Video
Check signal cable and connection.
Does the outpus signal appear at RA403 and R411 of IC406? (LDTGB, LVSYNCB, LHSYNCB, LCKBB) 1 2 3 4 Yes No Is the output of Pins 1, 17 of IC501 High ? No Check IC501 and related circuit Yes Check TFT-LCD panel and Inverter.
Does the analog video signal appear at R211, R212, R215? (BLUE, GREEN, RED) (IC201) Yes Does the sync signal appear at the output of Pin 14 of IC201and Pin 3 of IC 206 ? 5 6 (V-SYNC, H*V SYNC) Yes Does the input signal appear at the Pins 40, 41 of IC 300? 7 8 (PLL H*V MX-PDEN) Yes During power on-off does the input signal appear at the Pin 29,30 of IC300? (AD-SDA, AD-SCL) Yes Do the clock and sync signal appear at Pin 9 10 115, 117 of IC 300? (DCLKAB, MX_HSYNC) and does the digital video signal appear at thr output port PDA, PDB)? Yes During power on-off dose the input signal appear at the R 407 and R 408 ? (MX-SDA, MX-SCL) Yes Check IC 406 and related circuit.
No
Check IC201 and related circuit.
No
Check IC201, IC206 and related circuit.
No
Check the related circuit for these ports.
No
Check IC501 and related circuit.
No Check IC 300 and related circuit.
No
Check IC501 and related circuit.
5-2
SyncMaster 800TFT
5 Troubleshooting
WAVEFORMS
1 2 3 4
CH1 RMS = 3.26V
CH1 RMS = 3.25V
CH1 RMS = 3.12V
CH1 RMS = 2.20V
5
6
7
8
CH1 RMS = 4.96V
CH1 RMS = 4.42V
CH1 RMS = 3.20V
CH1 RMS = 3.24V
9
10
CH1 RMS = 2.50V
CH1 RMS =960mV
SyncMaster 800TFT
5-3
5 Troubleshooting
5-3 No OSD
WAVEFORMS
There is video but no OSD.
11
11 12 13
Does input signal appear at the Pins 2, 5 and 10 of IC404? Yes
No
Check IC405 and related circuit.
CH1 RMS = 4.18V
12
While pushing a front control button does any pulse appear at Pin 12 of IC404? Yes
No
Check IC404 and related circuit.
CH1 RMS = 3.26V
Replace IC404.
13
CH1 RMS = 3.26V
5-4
SyncMaster 800TFT