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1.开机无光栅无伴音,能听到电源部分发出“吱吱”的声音。测量行输出变压器T703各脚均未有短路或开路。经过详细的检查:发现R717保险电阻断路。T703的4脚没有+12V电压。在市面买不到保险电阻,采用国产1/8W 10Ω电阻代用,现在已正常使用四年多了,一切正常。若买到彩电保险电阻时换上即可。 2.有黑白图象,伴音正常,没有彩色。检查:解码器集成块TA7193P没有损坏,后发现Q501锗管2SA836eb结断路。
1. boot no grating sound, can hear the power part of the issue of “creak” sound. Measurement of the output transformer T703 feet are not short or open circuit. After a detailed examination: found R717 insurance resistance circuit. T703 4 feet no + 12V voltage. In the market can not buy insurance resistance, the use of domestic 1 / 8W 10Ω resistor substitution, it has been normal use for more than four years, everything is normal. If you buy a color TV insurance resistor can be replaced. 2. There are black and white images, sound normal, no color. Check: decoder block TA7193P is not damaged, after the discovery of Q501 germanium tube 2SA836eb junction broken.