Are These Circuit Traces Bad

[TinCanAlley]

Originally Posted by DaveWM

you need to deal with one problem at a time.

sounds like some kind of interference, make sure you are not setting a RF source near the set (like a DVD player on top of the tv) try a different signal source, double check that you have everything hooked up right (300ohm to 75 ohm balun) make sure you have not messed up lead dress inside the tv (crt wires, HV wires,tuner IF link). All grounds are in place.

Shot gun repairs often introduce new problems making diagnosis a more difficult problem. don't take it personally, a lot of peeps seem to think replacing every cap in sight will fix everything. It has been my exp that most sets from the mid sixties on do NOT require a lot of cap replacement, and doing so just introduces possible new problems.

So on to the existing problem without a scope its just a guess that the horz blanking is a problem causing the jail bars. if you have the schematic you should be able to find the diode that feeds the pulse to the blanking transistor. I do not know if its on a modual or chassis mounted. On the 25DC56 its NOT on the modual.

I see a few things marked with "blanking." I'm attaching some pics of a basic circuit layout that might be what you're referring to. If it's there, point it out and I should then know where to look on the schematic. Also attaching a pic of a pin with a label regarding raster blanking. Not sure what that is, but the lead is headed over towards the tuner wiring.