Philips 29PT6441/85, Service Manual

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Introduction
The 'L04' chassis is a global TV chassis for the model year 2004 and is used for TV sets
with large screen sizes (from 21 to 36 inch), in Super Flat and Real Flat executions
(both in 4:3 and 16:9 variants).
There are three types of CRT namely the 100 degrees, 110 degrees and Wide Screen
CRT.
•
The 100 deg. 4:3 CRT is raster-correction-free and does not need East/West
Correction (except when used in AP regions), therefore the corrections needed
are Horizontal Shift, Vertical Slope, Vertical Amplitude, Vertical S-Correction,
Vertical Shift, and Vertical Zoom for geometry corrections.
•
The 110 deg. 4:3 CRT comes with East/West Correction. In addition to the
parameter mentioned above, it also needs the Horizontal Parallelogram,
Horizontal Bow, Horizontal Shift, East/West Width, East/West Parabola,
East/West Upper and Lower Corners, and East/West Trapezium correction.
•
The Wide Screen TV sets have all the correction of the 110 deg. 4:3 CRTs and
also have additional picture format like the 4:3 format, 16:9, 14:9, 16:9 zoom,
subtitle zoom, and the Super-Wide picture format.
In comparison to its predecessor (the M8/L01.1), this chassis is has the following (new)
features:
•
Audio: The sound processor is part of the UOC processor (called “Hercules”).
•
Video: Enhanced video features, video drivers, and Active Control.
•
Control: Comparable to M8/L01.1 (e.g. Dual clock, I/O mapping, I/O switching).
•
Power Supply: Adapted to supply the Hercules IC, and to enable 0.5 W Standby
power dissipation. Also provisions are made for future extensions like DVD and
iDTV.