2
32” TFT TV Service Manual
06/03/2006
4. MULTI STANDARD SOUND PROCESSOR
The MSP34x0G family of single-chip Multistandard Sound Processors covers the sound processing of all
analog TV-Standards worldwide, as well as the NICAM digital sound standards. The full TV sound
processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed on a
single chip.
These TV sound processing ICs include versions for processing the multichannel television sound (MTS)
signal conforming to the standard recommended by the Broadcast Television Systems Committee (BTSC).
The DBX noise reduction, or alternatively, Micronas Noise Reduction (MNR) is performed alignment free.
Other processed standards are the Japanese FM-FM multiplex standard (EIA-J) and the FM Stereo Radio
standard.
Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC
and EIA-J. The MSP 34x1G has optimum stereo performance without any adjustments.
5. VIDEO SWITCH TEA6415
In case of three or more external sources are used, the video switch IC TEA6415 is used. The main
function of this device is to switch 8 video-input sources on the 6 outputs.
Each output can be switched on only one of each input. On each input an alignment of the lowest level of
the signal is made (bottom of sync. top for CVBS or black level for RGB signals).
Each nominal gain between any input and output is 6.5dB.For D2MAC or Chroma signal the alignment is
switched off by forcing, with an external resistor bridge, 5VDC on the input. Each input can be used as a
normal input or as a MAC or Chroma input (with external Resistor Bridge). All the switching possibilities are
changed through the BUS. Driving 75ohm load needs an external resistor. It is possible to have the same
input connected to several outputs.
6. AUDIO AMPLIFIER STAGE WITH TPA3002D2
The TPA3002D2 is a 9-W (per channel) efficient, Class-D audio amplifier for driving bridged-tied stereo
speakers. The TPA3002D2 can drive stereo speakersas low as 8
Ω
. The high efficiency of the TPA3002D2
eliminates the need for external heatsinks when playing music.
7. POWER
The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient
design of a step–down switching regulator (buck converter). All circuits of this series are capable of driving
a 3.0A load with excellent line and load regulation. Two different versions (one having a fixed output
voltage of 3.3 V, and one with 5.0 V) of this IC are used in the regulator board.
