[cgl18]

Hello, good afternoon, I would like to ask what the possible problem could be if I don't have an image on the screen. I changed the capacitors, resistors, and the networks. I did it myself because the factory doesn't send them to Argentina. I tried with another tuner from another one that I have and it didn't change.

[GarySP]

Welcome to the Phorum, cgl18! I am not your resource for television repair, but lots of friendly help is available here. You should get some responses soon. Take care, - Gary

[TV MAN]

Bob Anderson (Bandersontv) on Youtube would be the go-to guy on these. Lots of good videos. I don't know what model you have, but it's obvious there's no video. The good is that you have sweep and light on the screen. You swapped tuners with no change. So your problem has to be between the 1st IF stage and the video output (unless you are missing a voltage to your tuner or have a bad tube (between the two??). Couple questions: Do you have sound? If you have good sound, no video then start looking around the video amp/out stage. Check voltages etc. If no sound, then could bring you back up the IF chain. Double check your work, make sure the caps you replaced are the correct value, wires connected correctly, none broken, no solder blobs stuck somewhere. Beyond that, I hesitate to go further ... do you have schematic? Is it a transformer set or live chassis? What test equipment do you have? Isolation transformer?

[RadioSvit]

If you have a television signal generator (a must-have for TV repair) and an oscilloscope (the same), then this problem is solved very simply. Just connect the generator to the TV input, and then observe the signal passing through the cascades with an oscilloscope.