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F900BJ Schematic ( PDF Datasheet ) - LG

Teilenummer F900BJ
Beschreibung COLOR MONITOR SERVICE MANUAL
Hersteller LG
Logo LG Logo 




Gesamt 30 Seiten
F900BJ Datasheet, Funktion
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CA-130
FACTORY MODEL: F900BJ
MODEL:
F900B (F900BJ-AL**E)
( ) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.






F900BJ Datasheet, Funktion
Universal Serial Bus
Making use of USB (Universal Serial Bus)*
USB(Universal Serial Bus) is an innovation in connecting your different desktop peripherals conveniently to your
computer. By using the USB, you will be able to connect your mouse, keyboard and other peripherals to your
monitor instead of having to connect them to your computer. This will give you greater flexibility in setting up
your system. USB allows you to connect chain up to 120 devices on a single USB port, and you can hotplug
(attach them while the computer is running) or unplug them while maintaining Plug and Plug auto detection and
configuration. This monitor has an integrated Bus-powered USB hub, allowing up to 2 other USB devices to be
attached it.
USB connection (Option)
(1) Connect the upstream port of the monitor to the downstream port of the USB
compliant PC or another hub using the USB cable.
(2) Connect the USB compliant peripherals to the downstream ports the monitor.
*USB(Universal Serial Bus) is supported WINDOWS98 and Higher.
USB Downstream Ports
Connect the cables from USB compliant
peripherals-such as keyboard, mouse etc.
USB Upstream Port
To USB downstream port
of the USB compliant PC
or another hub cable
USB Upstream connector
USB Downstream connector
-6-

6 Page









F900BJ pdf, datenblatt
12. High Voltage Output & FBT (Flyback Transformer).
The high voltage output circuit is used for generating
pulse wave to the primary coil of the FBT (Flyback
Transformer (T701)). A boosted voltage (about 27kV)
appears at the secondary of the FBT and it is supplied
to the anode of the CDT.
And there are another output voltages such as the
dynamic focus voltage.
13. H-Linearity Correction Circuit.
This circuit corrects the horizontal linearity for each
horizontal sync frequency.
14. Vertical Output Circuit.
This circuit takes the vertical wave from the
TDA4841(IC801) and performs the vertical deflection
by supplying the saw-tooth wave current from the
TDA4867J (IC601) to the vertical deflection yoke.
15. Dynamic Focus Output Circuit.
This circuit takes H and V parabola wave from the
TDA4841(IC801), and amplifies these waves to offer
to the FBT (T701).
18. Static Convergence Control Circuit.
This circuit corrects the convergence of the screen by
supplying the convergence signal to the 4H (STC) coil
which is attached to the CDT near the deflection.
19. Moire Reduction Circuit
This circuit reduce interference between the periodical
display pattern and the CDT's slot (or dot).
The positions of every other one dot video signal
beams (red, green, and blue beam) are shifted finely,
thus reducing interference.
20. OSD Circuit.
This circuit is used for performing the OSD (On-
Screen- Display) function.
When a user selects the OSD Select/Adjustment
control, the adjustment status displays on the screen.
21. Video Pre-Amp Circuit.
This circuit amplifies the analog video signal from 0-
0.7V to 0-4V. This circuit is operated by taking the
clamp, R, G, B drives, and contrast signals from the
Micom (IC401).
16. H & V Blanking and Brightness Control.
This circuit eliminates the retrace line by supplying a
negative pulse to the G1 of the CDT.
17. Image Rotation (Tilt) Circuit.
This circuit corrects the tilt of the screen by supplying
the image rotation signal to the tilt coil which is
attached to the CDT near the deflection.
22. Video Output Amp Circuit.
This circuit amplifies the video signal which comes
from the video pre-amp circuit and amplified video
signal is applied to the CDT cathode.
- 12 -

12 Page





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