1
1. Introduction
Introduction
This training manual covers circuit description and troubleshooting for the direct view HA-3 TV chassis and the
similar projection TV RA-5A chassis. This information is on two levels. The first level covers board replacement.
As you read further, you enter the second level containing the information for component level to repair the board.
When repairing at component level, references are made to the DTV-02 training manual (P/N = DTV021000),
which contains circuitry similar to the HA-3 direct view TV circuitry.
Models Covered
Model numbers related to the HA-3 and RA-5A chassis are listed in Chart 1-1:
Chart 1-1 - Related Model Number
HA-3 Chassis Direct View TV Models
RA-5A Chassis Projection TV Models
KD-34XBR2 KDP
-57XBR2
KDP-65XBR2
The “D” in the model name refers to the digital decoder box built into the TV that can decode the 18 ATSC digital
TV formats approved for the USA and Canada over the air transmission. ATSC stands for “Advanced Television
Standards Committee” and replaces the 1940 NTSC (National Television Standards Committee) standard. The
above models have a 16 x 9 aspect ratio screen in compliance with most of the ATSC formats.
Chart 1-2 – TV Inputs
Video
Off the Air / Cable
Video 1-4 – 480i NTSC format
Air – NTSC channels 2-69
Video 5-6 – 480i NTSC format or 480p, 720p, 1080i ATSC format
Air – ATSC channels 2-69
Cable – NTSC channels 1-125
Technical Highlights
•
There are three microprocessors in the Q box and the TV operations micro is on the B board. They are listed
in Chart 1-3 below:
Chart 1-3 – Microprocessors in the TV
Q box (DTV decoder)
B Board
AD Board
Digital Processor
Main TV Micro
MPS CPU (i LINK)
Convergence Micro (PJ TV
only)
MID Microprocessor
•
The Q box micros talk to the TV micro using separate receive (RXD) and transmit (TXD) lines. The Main TV
Micro talks to the TV ICs using the standard I
2
C communications format.
•
The New white OSD Menu is generated by one of the Q box micros.
•
The TV micro generates the service mode OSD and green displays as before but there are two intensities for
the green channel display. When changing channels, the green channel number shows at full intensity for 1.5
seconds then drops in brightness to prevent burning the CRT.
•
All the video passes through the Q box. The Q box is exchanged as a package.
•
There are self-diagnostics in these TV sets with memory to assist in locating shutdown causes.
•
One horizontal high scan frequency of 33.75kHz, yields less geometry/convergence adjustments.
•
Geometry / Convergence Adjustments are made in the FULL picture mode and its data is copied into most
other picture modes
Summary of Contents for KD-34XBR2 - 34" Hdtv Fd Trinitron Wega
Page 77: ...74 RA 5A Chassis Board Layout ...
Page 108: ...APPENDIX ...
