Small Signal Process - THOMSON MT31AS Service Manual

Service manual of MT31AS
The comparison fig of power on supply

5.3.2 Small signal process

Decode and I/O part's core is main IC (MTK 5531 series chip). IC is used to decoding analog
TV signals such as DVB-T and ATSC code. It supports many kinds of standard video signals, HDMI
1.2a, many kinds of audio format codes, panel driver control, T-CON function, two LVDS,
mini-LVDS generator. Analog video, audio, HDMI signals enter main IC directly. RF signals decoded
to IF signals by Tuner. IF signals are demodulated to parallel digital signals entering main IC by
DVB-T2/T/C decode chip. Analog part signal is inputted to main IC. FLASH storage program and
user data. Main IC read the FLASH's program when it is work. The key data generated by users
execute operation is also deposited into FLASH. Picture signals are outputted to OPEN CELL by
LVDS. It can generate LVDS or transformed to mini-LVDS by T-con in order to match different
panels. Audio signals are processed to enhancing sound inner main IC. It is transformed to analog
audio small signal outputting to speaker by DAC. Speakers make a processed sound. Audio signals
also generate SPDIF digital signals by coder and are outputted to ports by amplifier.