If you are maintenance technician of an elder TV,you are opposite certainly before because all sorts of the television adjustment the potentiometer that parameter uses, adjustable resistor, switch contact wears away because of using generation for a long time, a variety of breakdown that oxidize and arise are experienced somewhat, the breakdown that the occurrence of technology of IC bus line will make afore-mentioned place arise now not answer exist.
Means of system of IC bus line shows the bus line between integrated circuit is controlled, the input between the CPU that it can solve big screen color television well and numerous IC / output interface, make circuit simplification, because of,solved vintage television thoroughly all sorts of potentiometer, adjustable resistor, the breakdown that the oxidation that switch contact causes because of place of with the passing of time wears away and arises, increased a television greatly but * sex. IC bus line is actually by line of a serial clock (SCL) with data line (SDA) the crewel of composition that has multiterminal to control capacity is two-way and serial data bus line, its core is advocate accuse a CPU, this kind of CPU still can ask according to actual use derivative group or one many groups bus line (if Le Sheng M17 is mixed,M18 movement has bus line of two groups of IC) . Because introduced bus line to control a technology to make of CPU bring a foot to decrease greatly, in circuit CPU controls each to be accused through finding location way IC, it can is opposite (EEPROM) packet, video / chroma / scanning / harmonious / AV switch / frequency is handled / the circuit such as the picture in the picture undertakes controlling. Be accused (namely IC) the place that differs with general and common IC is much circuit of interface of an IC bus line, color television IC is imitate circuit more, still need a setting to D/A is changed and control switch in interface circuit accordingly, after the data classics decipher that makes CPU delivers and D/A are changed, undertake controlling to IC. IC bus line has control of two phyletic form: 1, use control (the user is used) 2, adjust control (use when maintenance) namely so-called market pattern and industry pattern, IC bus line basically has the following kinds of functions: 1, handle a function, this function finishs an user to be like program preelection to the television, volume, brightness, contrast, the control of chroma is operated. 2, adjust a function, this function basically completes a TV set the working way of unit to each circuit undertakes establish and adjustment a function. After entering industry pattern, we can pass a remote controller or operation key finishs Gao Fang AGC, deputy brightness, deputy contrast, secondary volume, , field linear, field center, row, pillow school, wait evenly in vain adjust. 3, detect show, CPU can hang received IC to undertake scanning detecting to place through IC bus line, show the IC that has trouble go up in screen. 4, automation adjusts a function, namely alleged data restores a function automatically, should want to change be about when packet this function.
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