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Mystic_Merlin · Joined: 15 Oct 2007 Posts: 496 Location: Bangkok

No the chips are not swappable, these are logic ICs with specific functions hence why they're numbered.

This is unfamiliar but since you're able to load and run a game I wouldn't think of a ram issue.
Actually I once had a similar problem with a defective IC on a PFX2 that was running very hot within a couple of minutes operating, it would then freeze or black screen. Can you touch all the ICs and check if one is running really hot?

Is the problem occuring for 4 minutes every time you turn it on or only when you haven't used it for a while?

lumpy57 · Joined: 08 Sep 2013 Posts: 11

I'll try to check if something is getting hot, but in fact, the unit is not working a second even cold. The only way to get it working is to unplug it for a few weeks, then it works for about 4 minutes.
That's why I think it may be some capacitor.
Should the PFQ+ works without external power supply if I don't want to use the floppy disk, or does it need some external power at all time? For example I turn it on and let it on the menu screen?

Mystic_Merlin · Joined: 15 Oct 2007 Posts: 496 Location: Bangkok

Use the PSU as it can only help if you have some power issues. The capacitors may be faulty so it's always better to change them

lumpy57 · Joined: 08 Sep 2013 Posts: 11

Ok, I will change them then tell you if that fixed the problem. Can you tell me the ones that I must change? Only the electrolytics (big ones) or the (tantale?) small ones? Are some related to RAMboard? (as it boot with RAMboard out)

Mystic_Merlin · Joined: 15 Oct 2007 Posts: 496 Location: Bangkok

lumpy57 · Joined: 08 Sep 2013 Posts: 11

Ok, I changed the caps.
ProFighter working... for a few hours...
I played for about 45 minutes, then I paused the game for 2 hours. When I just came back, the game reseted, with some strange brighter band on the title screen.
I turned the console Off then On and : Black Screen. Like at first.
Maybe it is too hot, I will try again later.
Something strange: the 32 MB RAMCARD is recognized as only 24 MB (like the 24MB original one). I don't know if this can help ?
Something else too: there is a little acid attack on the ACC chip, but floppy loading is OK (some faults sometimes, but I think the floppy or the drive is weak: Eject and reload the floppy and it's OK).
If anyone is interested, I thinking about selling this unit to buy a working flash cart like superUFO.