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(一)画中画组件故障引起“黑屏”机型:长虹C2919PS 故障现象:开机有蓝背景光栅,接收电视信号及AV视频信号时,有伴音,屏幕为“黑屏”。分析与检修:本机有伴音,说明公共通道工作正常,开机有蓝背景光栅,说明显像管电路工作正常。集成电路TA8783(41)、(42)、(43)脚分别输出R、G、B信号,当用万用表测视放电路各部位电路电压时,发现TA8783(41)、(42)、(42)脚直流电压为2.1V,较正常值3.9V
(A) PIP components caused by a “black screen” Model: Changhong C2919PS Fault phenomenon: boot with a blue background grating, receiving TV signals and AV video signals, accompanied by sound, the screen is “black.” Analysis and Maintenance: This machine has a sound, indicating that the public channel is working properly, boot with a blue background grating, indicating the CRT circuit is working properly. The TA8783 (41), (42), (42) and TA8783 (41), (42) and (43) are respectively output R, G and B signals when the voltage of each part of the discharge circuit is measured with a multimeter. The DC voltage of the foot is 2.1V, which is 3.9V more than normal