Macbook A1989 / 820-00850 Restart problem

[GfilipeZ]

Hi,

I'm working on a A1989 820-00850 Logic Board.
The customer complained that the machine restarted randomly.
From the analysis I made to the Logic Board, I detected a small corrosion in the IC U7430.
Although the diode values are all correct, I replaced the IC with another one. But the machine kept the same problem.
However, I noticed that whenever I use the Heaven software, the machine restarts after a few seconds. That is, it is enough to have an increase in graphics processing for the machine to restart.

Has anyone had a situation similar to this?

[skynet85]

Re: Macbook A1989 / 820-00850 Restart problem

It is possible to start by inspecting the board for corrosion or(after) turning off the discrete card and test.

[GfilipeZ]

Re: Macbook A1989 / 820-00850 Restart problem

Thanks for your reply.

Already looked for corrosion, and the only place i found was in the IC i mentioned above.
This machine has integrated graphics, not a discrete card.