One of the key inspection points for poor field linearity is the field AC negative feedback capacitor, and the second key point is the field output capacitor. If the field amplitude is also abnormal, the field output capacitor should be checked first.
Data source: Beijing Hisense TV repair phone http://blog.sina.com.cn/haixindianshi.
Hisense TC-2125C TV, poor field linearity
Fault phenomenon: Poor field linearity, abnormal amplitude.
Fault involving circuit: Field output circuit.
Fault location: Field output capacitor 062 damaged.
Method, skills and tips: Important inspection points for poor field linearity.
Analysis and maintenance: Measuring the field linearity correction components did not find any abnormalities. Try replacing the field AC negative feedback capacitor C461, but the fault did not change. Check the capacitive elements of the field scanning circuit one by one. After trying to replace C462 (1000UF/25V), the image amplitude immediately returned to normal, and the linearity also returned to normal.