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  If your you look good, the 393 originals chips are LS series not but of F, and the spare used is fully compatible.   This MAC still running great!

After this long wait, finally I get the IC And this is the result: @apm, hits the nail on the head !! Thank you very much friend, you really know.   Mystery solved, and also having found the logical explanation of the problem, that is how we all learn.   Thanks to all.

The PCB was in my hands when I checked the continuity.

wow Wow!   Your response is encouraging and has the logic that was looking for.   Where have you been all this time? :)   I checked that there is continuity between UF8 pin 2, UF8 pin 12, and UG6 pin 15. I think that the next step is replace UF8.   I'll trying to get one of these ICs and will...

Yes, just try these two and UG8, the rest of the chips I think are discarded.   True, possibly be a little imperceptible flaw in the PCB. Anyway my time and my patience are finite.   At the moment I think I leave it, thanks for everything.

Received and replaced the PALs: And the result: :(   :(   :(   :(   :-/   :-/   :-/   :O   :O   :O

Thanks to you my friend!!   I am convinced that comes on the way the solution this issue.

Yesterday I unsolder and swap all the F253D IC's : The issue no was been solved :(

Well. we return to the issue.   The question raised was whether the Video muxes (F253D) can be the cause of the image appears a little cut by top.   Are the responses are valuable only if they are reasoned.   Thank you.

I love your sense of humor.   I continued on my thread trying to repair my PCB.

You want to sent me a piece of PCB also bare? I did not expect less from you. You are very kind.

Thanks unisever, that is, yes.

Thank you Parallel, but should look more at the productive part of this issue, not to disqualify and be more constructive.   I'm not begging for parts, I only say that I am surprised that there are people that says know the root of the problem and offering me a freePCB repair service and then...

I don't know if my car is wrong the engine or transmission, no one tells me anything clear, only receive invitations to carry the car to the workshop. But if I ask for parts to the "mechanics" say that they do not have, this is curious...   Of course I enjoy all this,  Do not you just that?   I...

I do not understand his slang phrase, but I guess the meaning. Translators still have their limitations.   I Only try to exhaust all possibilities before having to pull my PCB because I can't no replace some components that are impossible to get.   This to You seem to have it easy and should...

Hahaha, of course, my translator and I know the meaning. I was just kidding ;)   Thank you anyway.

In fact. As I told the translator translates, "FRIENDs, FRIENDs, FRIENDs" ;)   If I'm not mistaken there are at least 5 custom chips ... Would you be so kind as to be a little more specific?

This work has served to rule out a failure of VRAM: I guess the next step is to replace the video muxes F253, .. or am I losing my time and money? :(   :)

With the disk image that indicated above would suffice.

Thanx Luis Is rare found it but I'm sure that anybody has preserved. Other diagnóstic tool is wellcome.