KP53XBR45 (RA1 chassis) Symptom: Line Paring
Crisscrossing bands of horizontal scan lines sometimes
resembling a basket weave. The description was very hard to describe
without a picture. Once looked at closely it was determined there was no
video problem. It was a component in the vertical driver circuit for the
Jungle IC on the "M" board. Below is a close up of the oscilloscope showing
this ripple or oscillation on the vertical ramp.
We are connected to the high side of vertical deflection
yoke. The high frequency ripple is in the ramp portion of the signal. The
anomaly in this picture resembles about 2~3 volts Peak to Peak. It is riding
on a 60 volt peak to peak overall signal.
I have expanded the vertical gain enough to see the
ripple and measure its amplitude. This wave form should be a clean, linear
Return to Picture Gallery Graphic
Dennis Viereck email@example.com