LG T910BU Service Manual page 11

11. D/D Drive & Convert Circuit.
This circuit is used for supplying B + voltage to
horizontal deflection output transistor (Q801). This
circuit makes to add side-pincushion correcting signal
to B + voltage.
12. Horizontal Deflection Output Circuit.
This circuit makes the horizontal deflection by
supplying the saw-tooth current to the horizontal
deflection yoke.
13. 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.
14. H-Linearity Correction Circuit.
This circuit corrects the horizontal linearity for each
horizontal sync frequency.
15. 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
TDA4866 (IC601) to the vertical deflection yoke.
17. 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. H & V Blanking and Brightness Control.
This circuit eliminates the retrace line by supplying a
negative pulse to the G1 of the CDT. The brightness
control circuit is used to control of the screen
brightness by changing the DC level of G1.
19. 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.
20. 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.
21. 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.
22. Video Bright-Window Circuit.
This circuit amplifies the analog video signal from 0-
0.7V to 0-0.9V when it was operated by PC Bright
Window program. With each input being seperately
controlled by it's own contrast to allow luminance
differentiation between inside and outside Window
Video. When a user select Bright-window icon and
drag his mouse to the special point of screen that
window is highbrighted by window highlight function.
23. 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).
24. 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.
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