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故障现象:一台康佳2588X2彩电,光栅上部场幅卷边并压缩。光栅下部图像及伴音正常。分析与检修:从表面上看,光栅是在场扫描电路上出现了故障。检查场扫描局部电路(见图1),测场扫描集成电路TA8724K43脚和65脚发现,它们分别由标称电压28V和27V下降至20.9V和21V。断开电感L410,测VD
Symptoms: a Konka 2588X2 color TV, grating the upper hem curl and compression. Grating lower part of the image and sound normal. Analysis and Overhaul: On the surface, the grating is in the presence of scanning circuit failure. Check the field-scan partial circuits (see Figure 1) and found on the TA8724K43 and 65-pin of the ScanScan integrated circuits that they were dropped from nominal 28V and 27V to 20.9V and 21V, respectively. Disconnect inductance L410, measure VD