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故障现象:AV模式时,无图像。检修:出现此类故障时,首先利用双画面功能判断是主画面还是副画面有问题。若主画面无图像,则检测N102(VPC3230D)(72)脚是否有信号输入,若无信号输入,则检查由AV插座至N102通路是否有问题;若有信号输入,则检测R143～R148等排阻输出的Y、C(亮、色)信号及行、场等信号是否正常。若信号不正常,
Symptom: AV mode, no images. Overhaul: In such failures, the first use of dual-screen function to determine whether the main screen or sub-screen problems. If there is no picture on the main picture, it will detect whether there is signal input on the N102 (VPC3230D) (72) pin. If there is no signal input, check if there is any problem from the AV socket to the N102 channel; if there is signal input, detect R143 ~ R148, Resistance output Y, C (light, color) signal and line, field and other signals are normal. If the signal is not normal,