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黑白电视机尽管属于淘汰对象,但在农村仍占有一定比例,有些老式黑白电视机出现故障很难维修,尤其是分立元件的机芯,如果无图纸、线路无印字更令人头痛。这时采用更换主板也是好办法,况且主板价格已降很低。新主板多采用UPC三片机或其它型号的集成电路组成,性能良好。对于用户来说,更换主板使报废的旧电视恢复生命也是可以承受的。但是操作时如果一换了之不作调整,
Although black-and-white televisions are objects of elimination, they still occupy a certain percentage in rural areas. Some old black-and-white television sets are difficult to repair due to failures. In particular, movements of discrete components are more troublesome if there are no drawings and no lines are printed. It is also a good idea to replace the motherboard at this time. Moreover, the price of the motherboard has dropped. The new motherboards mostly use UPC three-chip machines or other types of integrated circuits, which have good performance. For the user, replacing the motherboard can also make the retirement of the old TV obsolete. However, if there is no adjustment during the operation,