9． ． ． ． Program Diagram - Haier HTN19R12 Service Manual

9. Program Diagram
I. Features
HTN19R12 color TV sets (designed for the US market) incorporate the monolithic integrated circuit
LA76814K developed by SANYO in 1999 and the CPU LC863432B-535A designed for LA76814K
control.
LA76814K intergrates the sound accompany filter and trap filter in the chip, resulting in minimized
application of peripheric components, maximized integtration and reliable performance. The chip
functions for picture intermediate frequency amplification, picture detection, sound intermediate
frequency amplification, sound frequency discrimination, video amplification, choma decoding, line
and field synchronized scanning wave formation and output. The circuits of picture detection, sound
frequency discrimination and chroma decoding incorporate PLL demodulation which is noted for
significant stability and reliability. In addition, this chip integrates the brightness and chroma retarding
lines and additional functions of black level extension, bus geometric figure adjustment, I
on the basis of the 7687, resulting in test point free assembly, reduced components of test point and
peripheric components and improved picture quality.
The CPU LC863424 uses SANYO LC863432B-535A series for reprogramming. In the design,
functions of CCD and V-CHIP as well as various function extensions are added for the North American
market. This chip also uses low frequency 32.7KHZ crystal oscillator to reduce interferences to
pictures and medium frequency signals.
II. Technical properties and requirements
1. Main performance index
1. Screen diagonal:
2. Receiving system:
3. Receiving channel:
4. Antenna input:
5. Picture limit noise sensibility:
6. Color sensitivity:
7. Two signal selectivity:
51cm
NTSC-M
VHF-channel 2~13
UHF-channel 14~49
CATV-channel 1~125
75ΩF plug
VHF≤51dB（μV）
UHF≤54dB（μV）
≤40dB（μV）
-1.5MHZ≥45dB
+6MHZ≥50dB
Program Diagram
2
C bu control