Wierd PSone screen problem (lines on the screen)

Post by **Gamelver** » Mon Apr 10, 2006 6:21 pm

Ok, well, on my psone screen these lines will kind of oscillate back and forth, sometimes getting bigger, and sometimes smaller, but always noticeable. Sometimes, if in the game there are only bright colors, you don't see it too much, but it's very annoying, if only because it's so subtle that it doesn't NEED to be removed, but I would very much like it to

.

Anyway, the screen is already implemented in the portable, and I don't want to take it apart yet...but if if anyone has heard of this or has any ideas of how to fix it (*cough*segasonicfan!*cough*

) then please throw 'em out to me

. I'd guess it's something wrong with the video processing chip internally, but I can never figure out how to trouble shoot with this...

Oh, and I'm inputting 8V into it, via a 7808...

Sword_Gun · Post by **Sword_Gun** » Mon Apr 10, 2006 7:24 pm

Maybe a Wire or contact is loose causing a semi short in the color display?

Post by **CronoTriggerfan** » Mon Apr 10, 2006 7:35 pm

Would that extra .8 volts have anything to do with it? Probably not, just wondering. Also, what about the regulators? I thought the PSOne screen used a 7805? I bet it's a problem with the actual screen, though, so you may need a new one.

CronoTriggerfan

PS- Did you do the LED mod? Being in the light box may have screwed something up.

timmeh87 · Post by **timmeh87** » Mon Apr 10, 2006 9:27 pm

do you have a dc-dc? if you do, theres a few recent threads in the n64 forum about this.

G-force · Post by **G-force** » Mon Apr 10, 2006 9:30 pm

What system is hooked up to it? NOAC maybe? Some NOAC's have lines that go up and then down. I'm in the process of trying to fix this little bug right now in fact. It's not that big of a deal, but slightly annoying on some levels of Mario.

Maybe you should try marshalls fix for his screen on his N64p, a small inductor in series to the input. Just something to try.

Ths is a silly question but, are you getting the right voltage when it's turned on?

Post by **CronoTriggerfan** » Mon Apr 10, 2006 10:42 pm

Is this for your rebuilt GCp or a NOACp?

Post by **Gamelver** » Tue Apr 11, 2006 5:14 pm

it's a GCp, yes....perhaps it is the video, but I'm gonna first try and input a PS2 input or something to see if it's the screen or the GC.

I'll try that inductor thing if it is the GC video output

.

if not, then it may be some component or loos wire....either way, I would hate to have to replace the screen

...

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Tue Apr 11, 2006 6:04 pm

did you jump the fuse in the back for brightness? sometimes when the brightness is cranked up and you jump that fuse that happens to me

Post by **Gamelver** » Tue Apr 11, 2006 8:29 pm

yeah, I jumped the capacitor, and I, unfortunately, don't have a replacement

.

I'll have to do some troubleshooting, I think, with various combos of video inputs/screens/etc.

.

joevennix · Post by **joevennix** » Tue Apr 11, 2006 9:14 pm

Does it do this in video out too?

Post by **Gamelver** » Tue Apr 11, 2006 9:17 pm

no, but I'm pretty sure it doesn't...if it does, though, then it's the cube...I'm pretty sure though that it's just the video processing chip of the psone screen gone a little screwy...an inductor might help, though

.

Post by **Gamelver** » Thu Apr 13, 2006 6:34 pm

ok, well, after a bunch of toiling away...nothing

. I tried inputting a PS2 and the same thing happened, so it's not the 'cube. I tried inductors on each input, and caps and what not...

It was definitely the contrast/brightness cap. that did it, though. On a different screen, I tested it, and it was fine until I did the brightness mod. Same problem happened.

I think I'm gonna look over all the available schematics of the screen to see if there's any possible way to fix this...I don't think I'll find much, but I should at least try

.

The lines don't appear as frequently now, though. Thought I might mention that

.

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Thu Apr 13, 2006 8:20 pm

i notice this also a little bit now and it really stinks though because without the mod some darker games are unplayable like mp2

but when i turn the brightness down a bit the lines tend to go away on my screen

Post by **Gamelver** » Fri Apr 14, 2006 11:08 am

ok, new update....

last night, while frustrated trying to figure this problem out, I quit working on it and let it sit over night (not on, sillies

...) with the brightness cap NOT shorted. I turned it on today and no lines on the screen! of course, it wasn't as bright....so, I think it may have something to do with some internal clock or something (not to tell time, but for the lcd) anyway, perhaps it got reset or something, so it works fine now. I'm debating whether or not I should do the brightness mod again (even if it's only for a quick second!) because I'd hate to have to let it sit for a while to check up on it again.

either way, at least I know that this problem IS beatable/fixable!

what I'll probably do is just finish the GCp and have a switch go to the cap. and ground, and I'll try it later tonight or something.

Edit: well, I did the brightness mod (jumped the cap.) and it turns out that it was just too dark to be noticeable

. anyway, I've found a decent compromise. I have the brightness mod on, but turn it down to a reasonable level to get the lines out. It's actually not too dark, and definitely useable

. Of course, if I can't see something, I'll just turn up the brightness and deal with the lines for a little

.

timmeh87 · Post by **timmeh87** » Fri Apr 14, 2006 12:28 pm

just out of curiosity, how did you do this brightness mod of yours? you you have like a variable resistor shorting the cap or something?