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故障现象:一台虹美WCD-25型彩电,彩色图像与黑白图像周期性出现,有时彩色图像也能维持几分钟,但色调不正常。分析与检修:试着将TA7698AP第(38)脚外接元件R_(615)R_(616)R_(617)和C_(605)全部换新,故障依旧。故怀疑TA7698AP内部选通电路或双稳态电路有问题,使消色电路时有动作所致。于是更换TA7698AP,故障仍未排除。再分析认为:该故障可能是输入TA7698AP第(38)脚的
Symptoms: A Hong Mei WCD-25 color TV, color images and black and white images appear periodically, and sometimes color images can also maintain a few minutes, but the color is not normal. Analysis and Maintenance: Try TA7698AP (38) feet external components R_ (615) R_ (616) R_ (617) and C_ (605) all the new, the fault still. It is suspected that there is a problem with the internal gating circuit or the bistable circuit in the TA7698AP so that the color-isochromic circuit may be caused by the action. So replace TA7698AP, the fault has not been ruled out. Re-analysis that: The fault may be input TA7698AP (38) feet