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L700CM
Service Manual
72 pgs1.68 Mb0

Daewoo L700C, L701CM, L700CM, L701C, L700CAV Service Manual

Service Manual
XGA COLOR MONITOR
Model : L700C/L700CM L701C/L701CM
L700CAV
D AEW OO ELECTR ONICS CO., LTD.
资料库
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3
SERVICING PRECAUTIONS
◆ General Servicing Precautions
1. Always unplug the AC power cord from the AC power source before: a. Removing or reinstalling any component, circuit board, module, or any other instrument assembly.
b. Disconnecting or reconnecting any electrical plug or other electrical connection. c. Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.
2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage
measuring device (DVM, FETVOM. etc.) equipped with a suitable high voltage probe. Do not test high voltage by “drawing an arc”.
3. Do not any spray chemicals on or near this instrument, or any of its assemblies.
4. Unless otherwise specified in this service manual, only clean electrical contacts by applying the
following mixture to the contacts with a pipe cleaner, cotton-tipped stick, or comparable nonabrasive applicator: 10% (by volume) Aceton and 90% (by volume) isopropyl alchohol (90%-99% strength).
5. Do not apply AC power to this instrument and/or any other of its electrical assemblies unless all the
solid-state device heat sinks are correctly installed.
6. Always connect the test instrument ground lead to the appropriate instrument chassis ground before
connecting the test instrument positive lead. Always remove the test instrument ground lead last.
7. Only use the test fixtures specified in this service manual with this instrument.
CAUTION: Before servicing instruments covered by this service manual, its supplements, and
addendum, please read and follow the SAFETY PRECAUTIONS of this manual.
NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any
of the safety precautions on page 1 of this manual, always follow the safety precautions.
Remember: Safety First.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors
may result in a explosion.
CAUTION: This is a flammable mixture. Unless specified in this service manual, lubrication of
contacts is not required.
4
◆ Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components are commonly called Electrostatically Sensitive (ES) Devices. The typical examples of ES devices are integrated circuits, some field-effect transistors, and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, wipe off any electrostatic charge on your body by touching any known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device which should be removed for potential shock reasons prior to applying power to the unit under testing conditions.
2. After removing the electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge buildup or exposure to the assembly.
3. Only use a grounded-tip soldering iron to solder or unsolder ES devices.
4. Only use an anti-static type solder removal device. Some solder removal devices not classified as “anti­static” can generate enough electrical charges to damage ES devices.
5.
Do not use freon-propelled chemicals. These can generate enough electrical charges to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).
7. Immediately before removing the protective material from the leads of replacement ES devices, touch the protective material to the chassis or circuit assembly into which the device will be installed.
8. Minimize bodily movements when handling unpackaged replacement ES devices. (Otherwise harmful motion such as the brushing together clothes fabric or the lifting your foot from a carpeted floor can generate enough static electricity to damage ES devices).
◆ General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron with appropriate tip size and shape that will maintain tip temperature between a 550°F-660°F (288°C-316°C) range.
2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean.
4. Throughly clean the surface to be soldered. Use a small wire-bristle (0.5 inch or 1.25cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners.
5. Use the following soldering technique: a. Allow the soldering iron tip to reach normal temperature (550°F to 660°F or 288°C to 316°C) b. Hold the soldering iron tip and solder strand against the component lead until the solder melts. c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil,
and hold it there until the solder flows onto and around both the component lead and the foil.
d.
Closely inspect the solder area and remove any excess or splashed solder with a small wire-bristle brush.
CAUTION:
Be sure that no power is applied to the chassis or circuit, and observe all other safety precautions.
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
5
FIGURE 1. USE SOLDERING IRON TO PRY LEADS
◆ IC Removal/Replacement
Some utilized chassis circuit boards have slotted (oblong) holes through which the IC leads are inserted and then bent flat against the circuit foil. When holes are slotted, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 on the page under the title of general soldering guidelines.
◆ Removal
1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.
2. Draw away the melted solder with an anti-static suction-type solder removal device (or with desoldering braid before removing the IC.
◆ Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and solder it.
3. Clean the soldered areas with a small wire-bristle brush. (lt is not necessary to reapply acrylic coating to the area).
◆ “Small-Signal” Discrete Transistor Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as possible to the component body.
2. Bend the ends of each of three leads remaining on the circuit board into a “U” shape.
3. Bend the replacement transistor leads into a “U” shape.
4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the “U” with long nose pliers to ensure metal-to-metal contact, then solder each connection.
◆ Power IC, Transistor or Devices Removal/Replacement
1. Heat and remove all solders from the device leads.
2. Remove the heatsink mounting screw (if applicable).
3. Carefully remove the device from the circuit board.
4. Insert new device in circuit board.
5. Solder each device lead and then clip off excess lead.
6. Replace heatsink.
Panel Size 17-inch (43.2cm) diagonal
Pixel Pitch 0.264 x 0.264mm Viewing Angle 75°(Right/Left)
70°(up), 70°(down) Contrast Ratio 400:1 contrast ratio (typ) Brightness 250cd/m
2
brightness (typ)
Color Filter RGB vertical stripe
Synchronization Horizontal 30 - 80KHz
Vertical 56 - 77Hz
Video Bandwidth 135MHz Max Resolution 1280 x 1024 75Hz Optimal Resolution 1280 x 1024 60Hz Colors 8bit (16.7M Colors) Display Area 337.9mm x 270.3mm PC Input Signal Sync H/V separate (TTL)
Video 15 pin mini D-sub(Analog RGB)
DVI-D(Option)
AV Input Signal Video CVBS(RCA), S-Video(Mini-DIN) (L700CAV only) Audio RCA Left+Right Input
Stereo Mini Jack Input & Output
TV Receiving Signal TV Tuner NTSC, PAL (Option) External Speaker Output 4W(Left 2W+Right 2W) (L700CM/L701CM/L700CAV only) Plug and Play VESA DDC Compatible Power Source 100-240Vac, 50/60Hz (Free Voltage) Power Consumption 45W (without speaker) Dimension-W x H x D 420 x 398 x 194mm (with stand) (without speaker) 420 x 360 x 68 mm (without stand) Weight-net/gross 6.2/7.6Kg(13.6/16.7lbs) Power Saving EPA, VESA DPMS, Nutek Compliant Tilt Range 5° forward, 30° backward Operating Temperature 10 ~ 40°C /50 ~ 104°F
6
◆ Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as possible to diode body.
2. Bend the two remaining leads perpendicularly to the circuit board.
3. Observing diode polarity, wrap each lead out of the new diode around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect the solder joints of the two “original” leads on the circuit board copper side. If they are not shiny, reheat them and apply additional solder if necessary.
TECHNICAL INFORMATION
a
a
7
This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 80KHz, and all vertical frequencies from 56Hz to 77Hz. This TFT LCD monitor supports IBM PC, PC/XT, PC/AT, personal System/2 (PS/2), Apple Macintosh, and compatible users crisp text and vivid color graphics display when using the following graphics adapters : (VGA, Super VGA, VESA, XGA, SXGA and Apple Macintosh Video Card). And so, this TFT LCD monitor has a maximum horizontal resolution of 1280 dots and a maximum vertical resolution of 1024 lines for superior clarity of display.
By accepting analog signal inputs which level is zero to 0.7 Volts. This TFT LCD monitor can display 16.7M colors depending on the graphics adapter and software being used.
◆ Abbreviations
ADJ Adjustment AFC Automatic Frequency Control TFT-LCD Thin Film Transistor Liquid Crystal Diplay CCFL Cold Cathode Fluorescent Lamp H.SYNC Horizontal Synchronization OSC Oscillator P.S.U Power Supply Unit PWA Printed Circuit Board Wiring Assembly R.G.B Red, Green, Blue V.Sync Vertical Synchronization ADC Analog Digital Converter
GENERAL INFORMATION
8
Arrangement of 15-pin D-sub connector
Pin Signal
1 Red 2 Green 3 Blue 4 GND 5 GND 6 GND - Red 7 GND - Green 8 GND - Blue 9
+5Vdc
10 GND - H.Sync 11 GND - V.Sync 12 Bi-directional Data (SDA) 13 Horizontal Sync 14 Vertical Sync (VCLK) 15 Data Clock (SCL)
1
610
15
PIN CONNECTOR
• The white balance adjustment has been done by a color analyzer in factroy. The adjustment procedure, described in the service manual is made by a visual check.
• Allow 20 minutes warm-up time for the display before checking or adjusting only electrical specification or function.
• Reform the leadwire after any repair work.
◆ Caution For Servicing
•
In case of servicing or replacing inverter, high voltage sometimes remains in the output of the inverter. Completely discharge high voltage before servicing or replacing inverter to prevent a shock to the serviceman.
CAUTIONS FOR ADJUSTMENT AND REPAIR
9
Control Panel
<< L700C/L700CM >>
OPERATION AND ADJUSTMENT
swithes the monitor on and off.
shows both normal operation and power management status with power indicator light.
POWER Indicator
POWER
1
2
3
12678
45
moves cursor to the right or low window in the OSD window and increases the value of any selected function.
3
4
moves cursor to the left or high window in the OSD window and decreases value of any selected function.
*
( )
*
( )
SELECT
EXIT
AUTO
5
8
7
moves from top menu to sub menu in the OSD window and opens the function window for the selected icon.
MENU
6
turns the OSD window on.
turns the OSD (On-Screen Display)
window off and moves from sub menu to top menu in the OSD window.
launches the AUTO TRACKING
function directly.
*
( )
*
( )
: Hot Key
10
Key Process
HOT KEY
AUTO TRACKING
BRIGHTNESS
When there is no OSD, if you press this AUTO button, you can use the best display performance fit for a current mode.
When there is no OSD, if you press this BRIGHTNESS button, you can adjust the brightness directly.
: decreases brightness : increases brightness
OSD OFF
MENU
EXIT
EXIT
EXIT
OSD
OSD
SHARPNESS
SHARPNESS
UT L TY
UT L TY
UT L TY
1280X1024 80K 75
SELECT
SELECT
AUTO
11
Control Panel
<< L701C/L701CM >>
moves cursor to the right or low window in the OSD window and increases the value of any selected function.
swithes the monitor on and off.
shows both normal operation and power management status with power indicator light.
POWER Indicator
POWER
1
3
4
2
moves cursor to the left or high window in the OSD window and decreases value of any selected function.
*
( )
*
( )
1
345678
2
SELECT
EXIT
AUTO
5
8
7
moves from top menu to sub menu in the OSD window and opens the function window for the selected icon.
MENU
6
turns the OSD window on.
turns the OSD (On-Screen Display)
window off and moves from sub menu to top menu in the OSD window.
launches the AUTO TRACKING
function directly.
*
( )
*
( )
: Hot Key
AUTO
MENU
EXIT
SELECT
BRIGHTNESS
12
When there is no OSD, if you press this AUTO button, you can use the best display performance fit for a current mode.
When there is no OSD, if you press this BRIGHTNESS button, you can adjust the brightness directly.
: decreases brightness : increases brightness
AUTO TRACKING
AUTO
BRIGHTNESS
Key Process
HOT KEY
MENU
1280X1024 80K 75
UT L TY
EXIT
OSD OFF
SELECT
EXIT
UT L TY
OSD
SHARPNESS
SELECT
EXIT
UT L TY
OSD
SHARPNESS
13
Control Panel
<< L700CAV >>
swithes the monitor on and off.
shows both normal operation and power management status with power indicator light.
POWER Indicator
POWER
1
2
1
2
678
5 43
SELECT
EXIT
AUTO
3
4
5
moves cursor to the right or low window
in the OSD window and increases the value of any selected function.
moves cursor to the left or high window in the OSD window and decreases value of any selected function.
moves from top menu to sub menu in
the OSD window and opens the function window for the selected icon.
MENU
6
turns the OSD window on.
MUTE
8
mutes and restores sound by turns.
SOURCE
7
selects input signal in order
(PC --> SVIDEO --> VIDEO).
turns the OSD (On-Screen Display)
window off and moves from sub menu to top menu in the OSD window.
launches the AUTO TRACKING
function directly.
*
( )
*
( )
*
( )
*
( )
: Hot Key
14
When there is no OSD, if you press this AUTO button, you can use the best display performance fit for a current mode.
When there is no OSD, if you press this BRIGHTNESS button, you can adjust the brightness directly.
: decreases brightness : increases brightness
Key Process
HOT KEY
OSD OFF
MENU
EXIT
EXIT
EXIT
OSD
OSD
SHARPNESS
SHARPNESS
UT L TY
UT L TY
UT L TY
1280X1024 80K 75
SELECT
SELECT
AUTO TRACKING
AUTO
BRIGHTNESS
15
Adjustment Procedure
Adjust the CLOCK
control.
Perform the
AUTO
POSITION.
Is the H.Size
proper?
Is the
noise displayed on
the screen?
Perform the
AUTO
TRACKING.
Is the
noise displayed on
the screen yet?
Is the
noise displayed on
the screen yet?
Adjust the
CLOCK FINE
until the screen is
cleared.
Yes
Yes
Yes
Yes
No
No
No
No
End
*
L700CAV : for PC Source
16
Display horizontal & vertical frequency and polarity.
STATUS
Reset the screen to the Factory Preset Display Settings.
RECALL
AUTO POSITION
Choose automatically the proper horizontal position and vertical position & size of the screen image.
CONTRAST
Adjust the contrast of image, the difference between light and dark areas on the screen.
Adjust the display OSD Menu.
OSD TIME OUT
AUTO TRACKING
Adjust the horizontal & vertical picture image quality and size.
Select language for OSD (6 languages).
LANGUAGE
Adjust the position of the display horizontally(left or right) and vertically (up or down).
H. CENTER &
V. CENTER
Choose different preset color temperatures or set your own customized color parameters.
Adjust the width (horizontal size) of the screen image.
Sharpen the focus by aligning the illuminated pixels and adjust until the screen image looks focused, crisp and sharp. Adjusting the
CLOCK
FINE after the CLOCK adjustment will produce a clear screen.
Adjust the red color.
COLOR TEMPERATURE
CLOCK
CLOCK FINE
RED CONTROL
Adjust the green color.
Adjust the blue color.
GREEN CONTROL
BLUE CONTROL
ICON CONTROL FUNCTIONS
OSD Functions (L700C/L700CM/L701C/L701CM)
R
G
B
Adjust the display image quality (if the screen proceed to scaling up).
SHARPNESS
Adjust the OSD position horizontally (left or right) and vertically (up or down).
OSD POSITION
OSD
Adjust the blue color.
Adjust the red color.
17
CLOCK
SOUND
Increase or decrease audio volume.
VOLUME
Balance audio sound.
BALANCE
Adjust high frequency response.
Adjust low frequency response.
TREBLE
BASS
AUTO TRACKING
Adjust the horizontal & vertical picture image quality and size.
Adjust the width (horizontal size) of the screen image.
CLOCK
R
G
Sharpen the focus by aligning the illuminated pixels and adjust until the screen image looks focused, crisp and sharp. Adjusting the CLOCK FINE after the
CLOCK adjustment will produce a clear screen.
Adjust the green color.
CLOCK FINE
RED CONTROL
GREEN CONTROL
COLOR
;
OSD Functions (L700CAV)
B
Choose different preset color temperatures or set your own customized color parameters.
COLOR TEMPERATURE
Adjust the position of the display horizontally (left or right) and vertically (up or down).
BLUE CONTROL
H. CENTER &
V. CENTER
CENTER
<< OSD FUNCTIONS WITH USING PC >>
CONTRAST
18
Adjust the display image quality (if the screen proceed to scaling up).
SHARPNESS
Select language for OSD (6 languages).
LANGUAGE
Adjust the OSD position horizontally (left or right) and vertically (up or down).
OSD POSITION
OSD
Reset the screen to the Factory Preset Display Settings.
RECALL
Choose automatically the proper horizontal position and vertical position & size of the screen image.
AUTO POSITION
Display horizontal & vertical frequency and polarity.
STATUS
OSD TIME OUT
Adjust the display OSD Menu.
UTILITY
Adjust the contrast of image, the difference between light and dark areas on the screen.
CONTRAST
Balance audio sound.
COLOR
VOLUME
BRIGHTNESS
CONTRAST
Adjust the contrast of image.
Adjust the brightness of image.
Increase or decrease audio volume.
19
<< OSD FUNCTIONS WITH USING VIDEO >>
SOUND
Adjust saturation of image.
SATURATION
Adjust the hues of image.
HUE
Adjust the display image quality (if the screen proceed to scaling up).
SHARPNESS
Adjust high frequency response.
TREBLE
Adjust low frequency response.
BASS
BALANCE
20
Self Diagnosis
If there is no image, the Self Diagnosis screen will be displayed. Self Diagnosis function checks if the status of the monitor screen is No Signal, Out of range or None support.
“No Signal” screen is displayed when the D-Sub signal connector is not connected or the status of the monitor is on DPMS mode.
“Out of Range” screen is displayed when the applied frequency is under or over normal range.
Normal range
(Non-interlaced mode only) H : 30 - 80 KHz V : 56 - 77 Hz
“None support” screen is displayed when the applied frequency is under or over factory preset timings.
21
Standard Check point
1. Power source : 100 - 240Vac, 50/60Hz.
2. Aging : Take at least 20 minutes warm-up time.
3. Signal
Video input : Analog 0.7Vpp 75Ω terminal positive polarity Synchronizing : acceptable negative or positive at TTL level Max. Resolution : 1280 x 1024 75Hz Frequency
Horizontal : 30KHz - 80KHz Vertical : 56Hz - 77Hz (available only non interlace mode)
Adjustment
1. Sharpness set to 53%
2. Contrast set to 92%
3. Brightness set to 50%
4. Switching to factory alignment mode Press power key with Brightness left key at the power off status.
5. Video level adjustment Receive stair pattern of 16 step (doesn’t care any mode). Readjust coarse R, G, B in AD9884A menu before saturaton point.
(SG9884A : L700CAV)
6. Set up the tracking See the user’s manual at page 8th.
7. Switching to user’s mode If turn-off and turn-on then switched to user’s mode.
*
All of adjusted data stores by fade out of OSD.
ALIGNMENT PROCEDURE
a
22
TROUBLESHOOTING HINTS (L700C/L700CM/L701C/L701CM)
1. Abnormal mode detect
Is a input
H-sync of ADC(pin 40,
U13) correct?
Abnormal mode
detect
No
No
Yes
Yes
Is waveform
of pin 81 of ADC(U13)
correct?
Trouble in the H-sync
input circuit.
Trouble in ADC.
Trouble
in Scaler(U9).
Yes
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