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我们知道,彩色电视机水平一条亮线故障,一般是由场扫描电路及其供电电路异常引起的。但在三洋A3机心彩电中,当微处理器M34300N4—XXXSP或电视小信号处理集成电路LA7680的非场扫描电路部分及其有关引脚外围电路发生故障时,也会引起一条水平亮线故障。这点应引起检修人员的注意。下面是笔者遇到的两例该类故障的检修过程。例1 一台长虹C2151A型彩电故障现象:水平一条亮线。首先,测量场输出集成电路N451(LA7837)(12)脚电压为0V,而⑥脚电压高达8V,这是典型无场脉冲信
We know that the color TV level a bright line failure, generally caused by the field scanning circuit and its power supply circuit abnormalities. However, in the SANYO A3 telematics, a horizontal bright line fault may also be caused when the non-field-scan circuit portion of the microprocessor M34300N4-XXXSP or the TV small signal processing integrated circuit LA7680 and its associated pin peripheral circuits fail. This should cause the attention of maintenance personnel. The following is the author encountered two cases of such troubleshooting process. Example 1 Changhong C2151A color TV Fault phenomenon: a bright line. First of all, measuring field output integrated circuit N451 (LA7837) (12) pin voltage 0V, and ⑥ pin voltage up to 8V, which is typical of no field pulse