Tatung V17AFTW, Service Manual

Page: 53 / 72

Signal enter from P008 / P010 / P011
、
P012
、
P014. Enter Pin# A21 /
Pin#A12, A22 / Pin# A23,A33,A43. In addition to Audio MPX signal, the
process type is the same with TV signal.
(C)CV( Y / Pb / Pr ):
Signal enter from P011, P012, P014, Then enter Pin#43, 48, 54 of
AD9883-110 pass by the matching impedance resister and capacitance.
Change to RGB signal of YUV by I006 and pass to Port B of I019 by
six row-resister RP08~RP12. Then output to panel.
(D)Audio:
In addition to Audio signal of TV need to do MTS modulation by
TDA9850 at first. Audio source of others all connect Audio Processor (
I009:PT2314) to each left and right voice channels. Controlling by
MCU (I012) and selecting through I009. Just output one source to
Audio Power Amp (I010:BAT5417)to Speaker.
(4) MCU
Microcontroller
Refer to circuit diagrams Sheet 5 of 11 .
The Microcontroller I012 (W78E62BP) is running with the clock based on 14.318
MHz by I019 Pin#136 (Scaler TP6760 ) Clock internally.
C127 and R096 constitute a reset circuit. It properly the necessary active high
reset signal for I012(Microcontroller) to operator properly. This reset signal is
result that is fed into I012 (Pin#10) to provide the necessary system reset for the
proper operation of I012.
The signal IR DA (Pin#17 of I012 ) is used for Infrared Receiver. If the IR
Received some signal, I012 will send interrupt signal by Pin#2
、
3 ( MSDA
、
MSCL) to control any chip.
The signals designated AD0~ AD7 (Pin36~43 of I012) are data signal used for
transferring data between I012 and I019.
The signal TXD and RXD ( Pin#13
、
11 of I012 ) are used for debugging during
firmware.
I013 (24LC16B) provides necessary non-volatile storage for system operating
variables and parameters. It is controlled by I012 via MSDA an d MSCL signal,
witch pulled-up to +5V voltage with R092 and R093 (10K
Ω
).
(5) Panel interface