Haier 29FV6H Service Manual page 15

signal at pin 9 and pin 10 which come from N201(HAIER8829A-V1.0), the
desired video signal will be available at pin 3, and then sends to AV switcher
N802 (TC90L01N) after emitter follower V207 and V214.
The pin 31 of HAIER8829A-V1.0 output SIF signal. It will go back into the
pin 33 of HAIER8829A-V1.0 after C225. It is very good that the 4.5; 5.5; 6.0;
6.5 MHz filters which are used in second sound IF filter circuit are all
integrated into HAIER8829A-V1.0. So there's no need to add this part of the
circuit at external.
After processed by internal limiter; discriminating and pre amplification in
HAIER8829A-V1.0, audio signal will be available at pin 38, and then sends to
AV switcher N802 (TC90L01N) after emitter follower V210.
4. Luminance and chrominance signal circuit
The luminance signal or video signal comes from pin 18 of AV switcher
N802 (TC90L01N) will be sent to pin 20 or pin 24 of HAIER8829A-V1.0 via
emitter follower V808.
black level extension; delay circuit. The chrominance signal comes from pin
45 enters auto system recognition and 1 H delay line circuit consist of APC
and VCO circuit via chrominance BPF and chrominance ACC circuit
R-Y and B-Y after decoding, result in color difference signal which enters the
matrix circuit. TB1240N has integrated 1H delay line, the external VCO color
sub carrier oscillator is single frequency type working at 4.43MHz, will be
used for both PAL（4.43M）/NTSC（3.58M）.
5. AV Switch circuit
In this TV set, we make use of the TC90L01, which is designed by
TOSHIBA ELECTONICS for AV switch circuit. The TC90L01 is controlled by
the I2C bus. There are 3 series input ports and 2 series output ports and it
have the ALC function. The 3 series input ports are respectively used as:
inner video\audio signal, video\audio signal of AV1,video\audio signal of
AV2.The 2 series output ports are respectively used as: inner video\audio
signal and video\audio signal of AV out.
The TC90L01 is controlled by the HAIER8829A-V1.0 through the I2C bus.
Pin 13 and 14 are the input ports of the I2C bus, which control the function
of the TC90L01.According to data of the I2C bus, the TC90L01 select the
right video and audio signal from 3 series of input ports and output the
selected signal at the 2 series output ports.
The definitions of every pin of the TC90L01 are as follows:
Pin 1 and 3 are the L and R audio input ports from the pin 38 of the MCU.
Pin 2 is the inner video signal input port.
Pin 4 is the video input port of AV 1.
Pin 5 and 7 are the L and R audio input ports from the AV1 audio input.
Pin 6 is the chrominance signal input port from the S-video input.
Pin 8,9,11 is the video and audio input ports from the AV2.
matrix circuit via internal clamping; trapping; smoothing;
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to get the