Author£ºUnknown
Source£ºNetwork
2015-07-02 07:50:02
Core tips£ºPanasonic TC-29GF10R color TV, the line is not enough and the distortion of the pillow
The machine pincushion correction circuit using deflection distortion correction circuit ta8859p as core controller (circuit as shown in the figure), but also by the CPU (30), (31) foot sda2, scl2 control, in order to achieve the image field amplitude, center field, linear, the line width, center, and S correction distortion correction. At the same time to produce frequency sawtooth wave signal to the driving field output circuit. And compensate for the variation of the current in the tube bundle. Will be set in the "CHK4" maintenance adjustment state.
Press the remote control of the volume +, - keys, adjust the image lines and left, right and no distortion of the shape of the pillow. After the shutdown, the online measurement field parabolic wave amplifier in R765, Q701 and other elements were normal. Detection of IC701 pin voltage, found (2) pin voltage is 0.3V, the normal value of about O.6V. Along (2) foot line detection of relevant components. Found C707 (0.047 F/50V) internal leakage. After the replacement of C707, the function is set in the CHK4 repair and adjustment state. Carefully adjust the line amplitude with the left and right parabolic parameters. Line amplitude recovery normal, troubleshooting.