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Nice to know it!   Currently I have recapped both boards, not the power supply but I think don't there go the shots   Thank you.

Of course, I do not put it in doubt.   It's just that I'd like to know more opinions

Thank you, but it isn't so easy for my find of another logic board for testing... I think my only option is to find the solution without hurry and continue listening to expert opinion.

ok, but you say too : The only ever chance it could be the analog board, is if the back porch pulse is too wide and driving the CRT into cut-off for too long, thats generated by the flyback and feeds the vertical stage in a feedback format.  TDA-1170N?

So the layout of scanlines is normal, they are not too concentrated in the upper parts?

It is not possible, Only have this :( Any testing program?

A PAL/GAL of the logic board, pufff How can we verify it? And if possible can, find the faulty component. Any software testing perhaps?

We think the same. But also could be a problem of the CRT, isn't it?

If I move the mouse up to the top, this is partially hidden but I can deploy menu options.

The problem is not the scan lines, I force them to come out deliberately by itself gives a clue of the real problem.   The real problem is the lack of the upper portion of the screen image.   As I said this always happens, even booting an OS installation disc.

Maybe you do not appreciate too well in the video, but  the upper horizontal scan lines are more abundant.   Is this normal in a " healthy" screen?   See if someone can test with your mac increasing the brightness screen .   Thank you.

I recorded a video with very high brightness of the screen so that this horizontal scan lines are visible.   Please tell me if what you see is normal. Here the video: https://drive.google.com/file/d/0B75qCt15gEmOWmxfd2RmdGRGM1E/view?usp=sharing Thank you.

I also had in mind the possibility.   I even booted from a floppy disk installation and is still not visible this portion of the screen   I just install another set of SIMM modules and the problem persists :(

Exactly, it is clearly appreciated by the detail of the full right angles to the corners.   So is it possible that the problem is because some SIMM memory module is defective?

Hello fellow.   First congratulate you for having this forum so fabulous.   About a month ago came into my hands my first Apple computer, nothing more and nothing less than a Mactintosh SE/30 :)   I did the typical operations of cleaning and change the capacitors and the computer began to...