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okey! I would like to confirm this before I have to unsolder the VRAM chips and having to buy new ones.   It seems that there is a software of diagnosis called "MacTest is / 30 ''...

One more question: This issue is compatible with VRAM?

Was only for discat things and because I was bored ;D

Thank you. Finally got to read the ROM as W27c256.   I Wrote a new EEPROM with the content of the chip and the linked file above and the problem persists, the ROM working fine.

Ok. I have tried to change the title of this thread because it isn't very descriptive but it is not possible.   Well, I am ruling out possibilities.   I have extracted the VIDEO ROM chip and tried to read its contents set up my programmer to read a 27c64/2764 but the programmer has not...

OK. I understand.   I guess that these PAL are not known their equations and it is impossible to replace them in another way.

Thanks for the information.   Although there are parts of your response that I am not able to translate.   When you say "pal" would you tell PAL (part)? The translator tells me that this word means 'friend'   I do not understand what I want to ask this:   Sorry for the inconvenience.

Thanks for the reply.   Desoldering is no problem for me. Tell me  please only the component(s) that you suspect and I can move forward.

Thank you falen5.  I'll take your word for it!

Thank you. I'm spanish and these Macintosh here are scarce, therefore making it very difficult to access another logic board to compare. I'll has send a PM.

Thank you. You're very kind, but still its second sentence is incomprehensible. Words like "Novo" are not recognized in your language or in mine, both languages, by the way, daughters of Latin.   The schematics which you mean should be these: http://www.maccaps.com/MacCaps/Schematics.html

Wow, you say words that my translator is not able to interpret :)   You say that exist schematics for the network and there is nothing domain public, then I understand that for consult these schematics is necessary to pay.   It is possible that my difficulty in interpreting certain colloquial...

OK. The first thing is to know where to start. First I think that it should checking the VRAM and its route until the video signal generated which goes to the analog Board. For this it is essential the schematic. These are public domain?

Thank you but but this long shot possibility was ruled out long time.

Hi my friends.   I replaced TDA1170 from the analogic board and the problem persists.   Also I made a screenshot and I have extracted the picture from the machine to view that really should be displayed:       I would like to locate an a solution without having to change the logic board, as...

It was inside the case The accumulation of dirt come it by the fan with the years simply through use. Even so functions as the first day.

I'm all ears!!   Send my boards to thousands of miles I think that it is not viable.   Thank you.

So it was how it came to me.

Thank you.

My logic board recapped: That these images serve also if you see something strange.