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故障现象:开机后,无图、无声。出现此类故障时,首先检测各路电压是否正常;若开机检测+B、+8V、+5V、+3.3V电压正常,则检测场正/负供电电压是否正常。若正常,则检测HD驱动信号波形和VD+、VD-是否正常。若正常,则说明故障可能出在信号通道或CPU系统控制电路,此时可检测ICl03(TDA9373PS)輯輩訛～輱輩訛脚的驱动信号是否正常。若无R、G、B驱动信号输出,但测ICl03供电正常,则检查ICl03本身是否有问题。若更换TDA9373PS集成电路后仍无效,则检
Symptoms: boot, no picture, silent. When such a fault occurs, first check the voltage of each channel is normal; if the power-on detection of + B, +8 V, +5 V, +3.3 V voltage is normal, the detection of positive / negative field supply voltage is normal. If normal, then detect the HD drive signal waveform and VD +, VD- is normal. If normal, then the fault may be in the signal channel or the CPU system control circuit, this time can detect IC103 (TDA9373PS) series of mistakes ~ 輱 generation false foot drive signal is normal. If there is no R, G, B drive signal output, but the test ICl03 power supply is normal, then check whether there is a problem ICl03 itself. If the replacement TDA9373PS integrated circuit is still invalid, then seized