Working Principle Analysis Of The Unit - Panasonic TC-L39EM6X Service Manual

Working principle analysis of the unit

1. NTSC signals flow:
Antenna sig nal will be send to tuner TDST-H021F, t h e n T u n e r w i l l b e demodulating and
output standard video signal TV-CVBS, and sound SIF signal.
TV-CVBS will send to the master control IC MT5385 to video decode, de-interlace and scaler, then
output LVDS level drive for panel display.
The sound IF (SIF) will be fed into MT5385, after demodulating, pre-amplifying, bass adjusting and
volume control, the sound signal w i l l b e t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and sent to
digital amplifier TAS5707.
2. Composite/Component signal flow
Composite signal an d Compo nent signal will be fed to MT5385 to perform video decode, de-
interlace and scaler, then output LVDS drive level for panel display.
Audio signal from Composite/Component terminal via matched resistance is fed to MT5385 to bass
adjust and volume control, the sound signal will b e t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and sent
to digital amplifier TAS5707.
3. HDMI signal flow
Two HDMI video signals are directly fed to the master control IC MT5385 to digital decode, image
scale, then output LVDS drive level for panel display. HDMI audio signal via decoder built-in MT5385 to
bass adjust and volume control, the sound signal will b e t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and
sent to digital amplifier TAS5707.
4. USB signal flow
USB signal via USB connector sent to MT53 85 and its A/D conversion to YPbPr output for
MT5385, t hen output R/G/B of 24 bit to back end module to Video decode, de -interlace and
image scale, then send to LVDS level drive for panel display.
Sound signal of USB signal v i a matched resistance a n d sent to MT5385 to bass adjust and
volume control, the sound signal will b e t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and sent to digital
amplifier TAS5707.
5. SPDIF signal flow
The master control IC MT5385 will transfer digital sound signal out by format Dobly Digital or PCM.
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