Weird Playstation 1 Graphics & Text

Well i have several ps1 and repaired all those lasers using a multimeter.
I have yet to found one that glitch like what op described...
I have also to agree that it must be video Ram or gfx chip.

 

Yeah im not trying to repair the glitch. Just wanna adjust the laser lol

 

So you would like to have a glitchy psx that reads discs right?
Follow that tutorial... it depends a lot on how the laser is (worn or misaligned)
Good luck

 

Cheers. Will let you know the results

I just find the spelling mistakes odd. I could understand the images

 

That guide it's completely useless, ad you will need an oscilloscope not a multimeter to fix a laser drive. That are only guessed values nothing more..
Buy a new laser and stop joking around if you want fix your console.

 

Bit offtopic, but is it the same for adjusting Dreamcast laser pots?

 

Right. As I keep saying, you need a jitter meter to measure RF to CLOCK jitter with a PlayStation. And a special test disc. Not to mention a PLASTIC trimmer tool.

General laser diode measurement in a CD drive starts with measuring the RF level (peak to peak voltage). For later models, the accepted range was 0.9-1.3 Vp-p, so it's probably the same (Saturn was 0.1 Vp-p more tolerant either way). If it's below 0.8 Vp-p, throw the pickup in the bin.

You'll also need to check the Focus Error and Tracking.

As you can see from the above, you got lucky doing it the incorrect way.

A laser error won't fix the graphical issues. Change the laser and you'll more than likely find a game boots and has graphical issues. Like I said, it's not worth repairing when you can pick up another console dirt cheap.

Dreamcast, Mega CD, 3DO, Neo Geo CD, Jaguar CD, Sony Walkman... anything with a laser pickup. You measure the RF level, not what value the potentiometer has. That's what the test points on the board are for.

 

I've started a "battle" years ago about this argument, but lots of people always follow that guide which is totally guessed and wrong
But what you can do when there are people that don't even know how to use a multimeter and want teach things to someone that does this for work and has years and years of experiences in the field...

Sorry for the offtopic

 

"Licensed bx Sony Computer ! Ebertainment Europe"

 

In this specific case, fixing the optical pickup will almost certainly fix the boot screen corruption. That second boot screen (including the PS logo) is generated based on data written in the system area of the CD. On top of this, for some reason known only to Sony the license data files are written to the CD with the EDC/ECC fields zeroed out so they don't have any extended error correction. Hence if the read data is bad enough for errors to get through the standard CD C1/C2 error correction you end up with a corrupted boot screen.

Interestingly, this doesn't happen on the NTSC:J consoles - in that, the boot sector read from the disc is compared with a copy stored in the boot ROM, and unless it's 100% identical it refuses to boot the disc and goes to that "Insert a PlayStation CD-ROM" screen.

 

how to slip and shit yo pants 101