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【例1】故障现象:长虹CHD-W320F8型彩电,开机图、声正常,但在VGA和YPbPr状态无图像。分析与检修:YPbPr信号经高清滤波器U305(SM5302)滤波后,与VGA输入的R、G、B信号经U306(PSAV330M)选择后,从U306的④、⑦、⑨脚输入到GMl501。其他通道是好的,说明可能是GMl501、U306损坏造成的。
[Example 1] Symptom: Changhong CHD-W320F8 color TV, power-on figure, sound normal, but there is no image in VGA and YPbPr state. Analysis and Overhaul: After the YPbPr signal is filtered by the high-definition filter U305 (SM5302), the signals R, G, and B input by the VGA are input to the GM1501 via the U306 (PSAV330M) after being input from the ④, ⑦ and ⑨ U306. Other channels are good, indicating that may be caused GM1501, U306 damage.