Sierra Wireless 800TFT User manual

Category
TVs & monitors
Type
User manual

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COLOR MONITOR
SyncMaster 800TFT
(Toshiba Panel)
Manual
SERVICE
COLOR MONITOR 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
1-1-1 Warnings
1. For continued safety, do not attempt to modify the
circuit board.
2. Disconnect the AC power and DC power jack
before servicing.
1-1-2 Servicing the LCD Monitor
1. When servicing the LCD Monitor, Disconnect the
AC line cord from the AC outlet.
2. It is essential that service technicians have an
accurate voltage meter available at all times. Check
the calibration of this meter periodically.
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.
2. 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.
3. 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).
Figure 1-1. Leakage Current Test Circuit
4. 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.
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
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1 Safety Precautions
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
(READING SHOULD
NOT BE ABOVE 0.5mA)
LEAKAGE
CURRENT
TESTER
2-WIRE CORD
*ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
EARTH
GROUND
!
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.
2. 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.
3. 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.
1. Immediately before handling any semiconductor
components or assemblies, drain the electrostatic
charge from your body by touching a known earth
ground. Alternatively, wear a discharging wrist-
strap device. To avoid a shock hazard, be sure to
remove the wrist strap before applying power to
the monitor.
2. After removing an ESD-equipped assembly, place it
on a conductive surface such as aluminum foil to
prevent accumulation of an electrostatic charge.
3. Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage
ESDs.
4. Use only a grounded-tip soldering iron to solder or
desolder ESDs.
5. 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.
4. Check the insulation between the blades of the AC
plug and accessible conductive parts (examples:
metal panels, input terminals and earphone jacks).
5. 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.
6. Do not remove a replacement ESD from its
protective package until you are ready to install it.
Most replacement ESDs are packaged with leads
that are electrically shorted together by conductive
foam, aluminum foil or other conductive materials.
7. Immediately before removing the protective
material from the leads of a replacement ESD,
touch the protective material to the chassis or
circuit assembly into which the device will be
installed.
Caution: Be sure no power is applied to the
chassis or circuit and observe all
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 Precautions
1-2 SyncMaster 800TFT
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.
1-2 Servicing Precautions
WARNING: An electrolytic capacitor installed with the wrong polarity may explode.
Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions
section of this manual.
Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
2 Product Specifications
2-1 Specifications
LCD Panel TFT-LCD panel, RGB vertical stripe, normally white transmissive,
18-Inch viewable, 0.28 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz to 81 kHz (Automatic)
Vertical : 56 Hz to 85 Hz (~XGA), 76 Hz (SXGA)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1280 Pixels @ 81 kHz
Vertical : 1024 Pixels @ 76 Hz
Input Video Signal Analog, 0.714 Vp-p ± 5% positive at 75 , internally terminated
Input Sync Signal Type: Seperate H/V sync, Composite H/V, Sync-on-Green
Level: TTL level (V high 2.0 V, V low 0.8 V), Sync-on-Green (–0.25 V)
Maximum Pixel Clock rate 135 MHz
Active Display 359 ± 3 mm /
Horizontal/Vertical 287.2 ± 3 mm
AC power voltage & Frequency AC 90 to 264 Volts, 60/50 Hz ± 3 Hz
Power Consumption 54 W (max.), 48W (norminal)
Dimensions
Unit (W x D x H) 17.7 x 18.2 x 7.2 Inches (449.4 x 461.2 x 182 mm)
Carton (W x D x H) 22.4 x 11.6 x 22.8 Inches (570 x 295 x 580 mm)
Weight
(Net/Gross) 8.3 kg (18.28 lbs) / 11.8 kg ( 20.0 lbs)
Environmental Considerations 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
Item Description
2 Product Specifications
2-2 SyncMaster 800TFT
2-2 Pin Assignments
Sync
Type
Pin No.
15-Pin D-Sub & 13W3 Signal Cable Connector
Separate Composite
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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)
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)
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)
13W3
A1
A2
A3
4
4
A1-GND
A2-GND
A3-GND
3, 8
10
4
6
5
7
1, 2
Sync-on-green
2 Product Specifications
SyncMaster 800TFT 2-3
QRS
P
O
Video
Sync
Sync
Horizontal
Vertical
CDE
P
O
B
A
Video
Sync
Sync
Separate Sync
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.
C D
A
O
E
B
P
Video
Sync
Sync
Video
Q R S
A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width
C : Back porch D : Active time Q : Back porch R : Active time
E : Front porch S : Front porch
VIDEO
A
B
O
P
Q
R
S
Horizontal
Vertical
B
Green
Vertical
P
Q
R
S
O
Horizontal
H/V Composite Sync
Sync-on-Green
79.976
12.504
1.067
1.837
9.481
0.119
75.025
13.329
0.038
0.475
12.804
0.013
135.000
Positive
Positive
Separate
81.129
16.640
6.400
2.880
3.200
76.106
10.660
0.080
3.200
0.020
135.000
Negative
Negative
Com.
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
Positive
Positive
Separate
1024/85Hz
1024x768
1280/76Hz
1280x1024
1280/75Hz
1280x1024
1024/75Hz
1024 x 768
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
Positive
Positive
Separate
31.469
31.777
3.813
1.589
26.058
0.318
70.087
14.268
0.064
0.858
13.155
0.191
28.322
Negative
Positive
Separate
fH (kHz)
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)
Polarity
H.Sync
V.Sync
Remark
IBM
640/75 Hz
640 x 480
640/85 Hz
640 x 480
800/75 Hz
800 x 600
800/85 Hz
800 x 600
1024/60Hz
1024 x 768
VGA2/70 Hz
720 x 400
VGA3/60 Hz
640 x 480
Table 2-1. Timing Chart
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
Negative
Negative
Separate
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
Negative
Negative
Separate
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
Negative
Negative
Separate
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
Positive
Positive
Separate
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
Positive
Positive
Separate
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
Negative
Negative
Separate
Mode
VESA
Timing
2 Product Specifications
2-4 SyncMaster 800TFT
Memo
3-1-1 Removing the Stand
1. Remove 4 screws on the Stand.
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.
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.
SyncMaster 800TFT 3-1
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.
3-2 Reassembly
Reassembly procedures are in the reverse order of Disassembly procedures.
Memo
3 Disassembly and Reassembly
3-2 SyncMaster 800TFT
SyncMaster 800TFT 4-1
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 , Windows 98 , or Windows NT .
• 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
PC
SIGNAL
GENERATOR
3-WIRE
CABLE
SIGNAL CABLE
5V DC
ADAPTOR
PARALLEL CABLE
Figure 4-1. Setup 1, With Signal Generator
MONITOR
INTERFACE
BOARD VER. 2.0
PC
3-WIRE CABLE
SIGNAL CABLE
PARALLEL CABLE
D-SUB
CONNECTOR
5V DC
ADAPTOR
Figure 4-2. Setup 2, Without Signal Generator
R R R
4-2-1 Main Menu
4-2-1 (a) Service JIG : DV18
4-2-2 Sub Menu
4-2-2 (a) Panel Information
No Label Definition
No Label Definition
4 Alignments and Adjustments
4-2 SyncMaster 800TFT
Monitor On Time
Total hours that the monitor has been actively
functioning.
Panel Cycle The total number of times the Panel has been
turned ON.
Time Total in Hours that this Panel or Lamp has been
ON. Reset this number to 000000 after
replacing the part.
Panel Total number of hours that this Panel has
been ON.
Lamp, Upper Total number of hours that this Upper Lamp
has been ON.
Lamp, Lower Total number of hours that this Lower Lamp
has been ON.
Change No. 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.
Panel Replacement times. This value is 00 if original
equipment.
Lamp, Upper Replacement times. This value is 00 if original
equipment.
Lamp, Lower Replacement times. This value is 00 if original
equipment.
Message Shows the message.
Read Reads all Panel information data from the
AD Board
Write Writes the Panel Parameter Control values to the
AD Board
Read buffer Reload the Panel Parameter Control values from
the Program buffer
Return Main Returns to the Main menu
Figure 4-4. Control JIG Menu
Red max value Shows the red video signal max value
Green max value Shows the green video signal max value
Blue max value Shows the blue video signal max value
Red min value Shows the red video signal min value
Green min value Shows the green video signal min value
Blue min value Shows the blue video signal min value
Color Automatical screen contrast setting
Auto Adjustment
Red gain control Adjusts the red video signal gain control
Green gain control Adjusts the green video signal gain control
Blue gain control Adjusts the blue video signal gain control
Red cutoff control Adjusts the red video signal cutoff control
Green cutoff control Adjusts the green video signal cutoff control
Blue cutoff control Adjusts the blue video signal cutoff control
Panel information Shows the sub menu to panel information
(4-2-2 (a))
Scroll bar Changes the value or level of the selected
item. The window to the right shows the
value as it changes.
SAVE Saves the current adjustment value of
the R,G,B video contrast gain and
cutoff level
Setting 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
Exit Quits the DDC Control JIG
Figure 4-3.Service JIG Menu
1 2 3 4 5 6
7
8 9
10 11 12 13 14
15
16 17 18
a
b
d
e
f
k
c
g
h
i
j
n
o
l
m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
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 ( ) 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 to and from to
4-2-3 (c) When Replacing the Panel
1. Select the Read Buffer button ( ) 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 ( )
to record the data in the firmware.
4. Select the Return Menu button ( ) to Return
Main Menu.
4-2-3 (d) When Replacing the Upper and/or Lower Lamp
1. Select the Read Buffer button ( ) 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
( ) to record the data in the firmware.
4. Select the Return Menu button ( ) to Return
Main Menu.
4 Alignments and Adjustments
SyncMaster 800TFT 4-3
1
6 8 13
18
n
o
m
n
m
o
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.
4 Alignments and Adjustments
4-4 SyncMaster 800TFT
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.
Monitor On Time
Panel Cycle
Panel
Lamp Upper
Lamp Lower
: 000049Hr
Service Function
: 000088
: 000050Hr 00
: 000050Hr 00
: 000050Hr 00
Time Change No.
Figure 4-5. Service Function Menu Screen
4 Alignments and Adjustments
SyncMaster 800TFT 4-5
SyncMaster 800TFT 5-1
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
• 12V develop but no screen: Main PCB
• 12V 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 12 V appear at
DC jack connected to CN101?
Check Power Adaptor.
Yes
No
Does proper DC 5 V appear at
Pin 4 of IC101?
Check IC101 and related circuit.
Check Q103, Q105 and Q106.
Yes
No
Does proper 5 V - signal appear at
Pin 42 of IC501 (SW_REG_EN)?
Check IC501 and related circuit.
(CN102, Function Key)
Yes
No
5 Troubleshooting
5-2 SyncMaster 800TFT
5-2 No Video
Check signal cable and connection.
Check TFT-LCD panel and Inverter.
Check IC201 and related circuit.
Does the outpus signal appear at RA403 and
R411 of IC406? (LDTGB, LVSYNCB, LHSYNCB,
LCKBB)
Is the output of Pins 1, 17 of IC501 High ?
Yes
No
Yes
No
Does the analog video signal appear at R211,
R212, R215? (BLUE, GREEN, RED)
(IC201)
Yes
Check IC201, IC206 and related
circuit.
Does the sync signal appear
at the output of Pin 14 of IC201and Pin 3 of IC 206 ?
(V-SYNC, H
*
V SYNC)
Yes
No
Check the related circuit for these
ports.
No
Check IC501 and related circuit.
No
Check IC501 and related circuit.
No
Check IC 300 and related circuit.
No
Does the input signal appear at the Pins 40, 41
of IC 300?
(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)
Do the clock and sync signal appear at Pin
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
7 8
9 10
Check IC 406 and related circuit.
Yes
1 2 3 4
5 6
No
Check IC501 and related circuit
5 Troubleshooting
SyncMaster 800TFT 5-3
WAVEFORMS
4
CH1 RMS = 2.20V
5
CH1 RMS = 4.96V
6
CH1 RMS = 4.42V
8
CH1 RMS = 3.24V
9
CH1 RMS = 2.50V
2
CH1 RMS = 3.25V
3
CH1 RMS = 3.12V
7
CH1 RMS = 3.20V
10
CH1 RMS =960mV
1
CH1 RMS = 3.26V
5 Troubleshooting
5-4 SyncMaster 800TFT
Replace IC404.
Yes
No
There is video but no OSD.
5-3 No OSD
While pushing a front control
button does any pulse appear
at Pin 12 of IC404?
WAVEFORMS
Does input signal appear
at the Pins 2, 5 and
10 of IC404?
Check IC405 and related circuit.
Check IC404 and related circuit.
Yes
No
11 12 13
11
CH1 RMS = 4.18V
13
CH1 RMS = 3.26V
12
CH1 RMS = 3.26V
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Sierra Wireless 800TFT User manual

Category
TVs & monitors
Type
User manual
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