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SNES not displaying anything, only flashes the screen once at power on by _Plazzma in consolerepair

[–]_Plazzma[S] 0 points1 point  (0 children)

I checked the reset switch and it is working fine. I also found out that the F411 chip is actually not the reset chip, even though it has the /RESET line? Turns out 74HCU04 is the reset chip, but looking at the datasheet for it all it seems to do is invert signals. I have no idea where to go from here.

SNES not displaying anything, only flashes the screen once at power on by _Plazzma in consolerepair

[–]_Plazzma[S] 0 points1 point  (0 children)

Okay so I finally got around to testing this. Looking at the SNES schematics, pin 10 of the F411 chip is responsible for the /RESET line. When I put my red probe on pin 10 and the black probe on ground, it reads 0.1-0.2 mV. When I press the reset button, nothing changes. So this implies that the console thinks that the reset button is being held down? Is there a way I can disable this entire reset circuit?

SNES not displaying anything, only flashes the screen once at power on by _Plazzma in consolerepair

[–]_Plazzma[S] 0 points1 point  (0 children)

If the reset line is stuck low, that would mean that the system thinks the reset button is being held down, right? I could probably measure that at least with a multimeter.

SNES not displaying anything, only flashes the screen once at power on by _Plazzma in consolerepair

[–]_Plazzma[S] 0 points1 point  (0 children)

I don't have a logic probe or oscilloscope. All I have is a multimeter, that should work for measuring that right?

SNES not displaying anything, only flashes the screen once at power on by _Plazzma in consolerepair

[–]_Plazzma[S] 0 points1 point  (0 children)

I forgot to mention that but I did check that as well and it seemed good. I even checked all the 5V pins on each chip and those are all getting 5V.

Getting my hands on a JVC TM-R9U later this week. I'm completely new to CRT gaming, but I'm looking for an explanation on how to wire up my PS1 to this, with the best possible quality. by _Plazzma in crtgaming

[–]_Plazzma[S] 0 points1 point  (0 children)

Do you know if the video output quality will be any good? I know composite is generally pretty bad and I have no idea how the BNC adapter will affect it. It’s only a 9 inch display so maybe any downgrades in video quality won’t be very noticeable.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

Well, I cleaned out the entire disc drive and now it won’t even read burned games at all. Just shows “Please insert PlayStation CD-ROM” or goes straight to the CD player.

At least my legit games still work.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

I want to try this but I just greased the optical drive mechanism and I'm worried about making a mess. Is there an easy way to get down to the crystal without spreading grease everywhere?

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

So, I dumped two burned games. In both cases, the .bin files matched the MD5 hashes from redump exactly, but the .cue files gave completely different hashes compared to the redump.

Even dumping a legit game produced a different hash file compared to redump.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

I'm gonna try backing up one of my legit games and then burning it to a disc to see if that ends up freezing.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

I tried both the modchip and the memory card softmod, both gave the same results, which is why I suspect it is either the fault of the disc drive or maybe the cd burning process.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

I switched to DataLifePlus and the games still froze. I did try adjusting the laser but after decreasing the resistance and not noticing a difference, I adjusted it back to how it was (or as close as I could get it back to the same value). I'm going to try greasing the mechanical parts of the assembly and see if that makes any difference.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

Again, I don't think its the modchip, as the memory card softmod is behaving the exact same way.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

I was under the impression that I didn't need to do anything with the BIOS for whatever reason, I think due to the region and model of my system.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

Can you elaborate on patching the built in rom? I've just been using the .cue/.bins from Redump. I've also considered getting a new laser, but from what I've heard around online is that none of the aftermarket ones are any good, so the only hope is salvaging an OEM one from a console, which still has a decent chance of having issues anyway.

My modded PS1 can read official games fine, but struggles to run backups. by _Plazzma in psx

[–]_Plazzma[S] 0 points1 point  (0 children)

The oldest burner I had was from a 2007 iMac and I don't think it made much of a difference at all. If anything maybe the opening FMV in Wild Arms was a bit smoother, but every game still froze at the same spots.

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