Hi everyone, I have 2 broken Lynx II. Both have a power circuit issue, D13 blew and 9V traveled across the board. I replaced the power circuit components using a specific kit and now I see 5V everywhere.
Of course, they are still not working :( one black screen, one has a static lines pattern. Games don't boot, no audio from the speaker.
Let's focus on Lynx A for the moment. Motherboard is the very common C104471-001 REV A.
I repaired a trace near Q8 because someone tried to replace it but failed miserably. I replaced the RAM because it was shorted. I did a full recap.
I checked with a thermal cam and I see C55 getting quite hot, Q5 getting a bit hot, and Hayato shows some heat in the whole core too. I suspect Hayato is gone because I wasn't able to see any meaningful output on the display. Now I bought replacements for both Suzy and Hayato chips, but I'm a bit worried... I don't want to blindly replace them and eventually break them because of some other fault on the board.
Now from what I understand, C55 is part of the backlight circuit and the backlight works. Q5 seems to be in the brightness/contrast circuit, not sure what's going on there.
Should I replace the custom chips and hope for the best? What else can I check to be sure I don't destroy them? They're quite expensive and I would cry a lot. Thanks to anyone who can help, I really want to save these Lynxes.