Introduction - Philips L05HD Training Manual

Introduction

The L05HD TV chassis is designed for the model year 2005. This set is High Definition ready
with an NTSC tuning system. To receive the ATSC channels a set top box is required.
This design is used in large screen sizes of 27 and 30 inch with the 27-inch having a 4:3
aspect ration and the 30 inch version having a 16:9 aspect ratio. There are three types of
CRTs used which are the 100 degrees, 110 degrees, and wide screen version.
The standard architecture consists of a Main panel (called the family board), a Picture Tube
panel, a Side I/O panel, a HDMI panel, a HD panel, and a Top Control panel. The panels
consists primarily of conventional components with some surface mounted devices.
The functions for 1fH video and audio processing is performed in one IC (TDA1200xx, IC
7200), the Hercules chip. This chip is located on the solder side of the main panel.
The functions for the HD signals and 1fH to 2fH conversion is performed on the HD panel.
Except for switching, OSD, Closed Caption, Text, and A/D conversion, the bulk of the pro-
cessing is performed by the Trident chip, IC 7201.
The L05HD chassis has two signal processing sections, one for the 1fH (NTSC), and one for
2fH (HD) processing. Whatever signal is applied to the set, it is displayed on the CRT in a
1080i format.
The NTSC tuning system features 181 channels with on-screen display. The main tuning
system uses a tuner, a microcomputer, and a memory IC mounted on the main panel. The
microcomputer communicates with the memory IC, Remote Receiver, Tuner, Signal process-
ing IC, and HD processing section. The Memory IC retains the settings for favorite stations,
customer-preferred settings, and circuit settings. The circuit settings can be accessed by the
service technician via the Service Alignment mode.
The On-screen graphics and Closed Caption decoding are done within IC 7206 located on
the HD panel. They are added to the main signal in the Display Processor, 7221, located on
the HD panel.
Customer Operation
The L05 customer menu is similar to the L04 customer menu. The L05HD does not have
Picture-in-Picture.
Press the Menu button to make a selection. Press the Cursor up-down buttons on the
remote to highlight the desired selection. Press the right Cursor button to make the selection.
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