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1.检修背光板的小经验在液晶彩电背光板中,故障较多的部位是功率放大模块(或者MOS管)、高压升压变压器,这两部分也是背光板上重复电路最多的部位。一般背光板都有两组以上的全桥功率放大电路,即最少有4块以上相同的互补功率模块(或者8只MOS管)。利用“电阻比较法”可以很快的判定故障的部位。高压升压变压器也是比较容易损坏的部件,一般表现为变压器次级升压线圈局部短路(初级低压绕组不会坏的),如果用万用表欧姆档测量,则明显比正常阻值小许多。由于一块背光板上面最少有6～24只完
1 little experience repairing the backlight In the LCD TV backlight, the fault is more parts of the power amplifier module (or MOS tube), high-voltage step-up transformer, the two parts of the backlight circuit is also the most repeat parts. General backlight has more than two full-bridge power amplifier circuit, that is, at least 4 or more of the same complementary power module (or 8 MOS). The use of “resistance comparison method ” can quickly determine the fault location. High-voltage step-up transformer is also relatively easy to damage the components, the general performance of the transformer secondary booster coil partial short circuit (primary low-voltage windings will not be bad), if the multimeter ohm measurement, significantly less than the normal resistance much. Due to a backlight above at least 6 to 24 end