Back in post #573 you stated "G5 i soldered". I assume, then, that you meant that "G5 is soldered" (and is still original).Sorry Dave but I have never replaced G5..
I'm going out to dinner with friends tonight so I won't be able to proceed with the tests, I'll continue tomorrow if that's okay with you! A thousand thanks
Nivag, maybe i have a bad video logic?You notice that the whole of the screen is not affected but it seems a band of destruction passes through. This is very like the effect you get when you are NOPPing as the read comes through and contends with rendering the screen.
That is EXACTLY what you have... The CPU should not be doing anything, as it is physically removed...Nivag, maybe i have a bad video logic?
I am desperate really now!That is EXACTLY what you have... The CPU should not be doing anything, as it is physically removed...
The only real way to solve this problem (in my opinion) is to thorougly freeze each chip in turn using freezer spray. Whatever it is, it is clearly temperature dependent...
Warm the PET up and get the video problem to appear on the display.
Make a plan of logic chips that you want to freeze. Make a small box out of cardboard for the purpose of constraining the freezer spray to one chip at a time. Move the box around from chip to chip following the plan - and thoroughly freeze the chip under examination - looking for changes to the display.
If that doesn't work, move on to the next chip on the list and so forth.
I would test the following devices on schematic 8 in the order specified:
H11, G11, F9, F10, E11 and G9.
Since we also suspect G5 on schematic 6, I would do that as well.
Tick each one off as you go.
If it is none of those, then we move further back into the timing logic next.
Dave
ok, can i buy one on Amazon...You require proper electronics freezer spray
On the G11 sides nothing happens but if i touch with damp finger along side of chars rom, the defect disappear for one minute!@Deperato If you move a slightly damp finger along the sides of G11 does anything change?