Hello everyone and sorry for the late reply, very busy at work.
I have good news! I start with what Dwight ask me to check. i found no shorted capacitor's. So i replace the 7905 with ST L7905cv at 1.5A cause i saw datasheet on Texas instruments regulator and it was 1.5A.
I plug the beauty, switch it on and....
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I am very happy!
I need to open and check the keyboard, because the only key that working is the "space" key.
I have some more questions if you will allow me please. But i write them a bit later.
Thank you all!
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