PSOne LCD Screen Power Problem

So a while back I found a PSOne with the LCD screen at a flea market and decided to pick it up. It turned out that the 7.5v SCPH-113 (2amp) power supply that came with the console was dead right off the bat. Now the console itself powers on fine with my 8.5v PS2 power supply. The console even powers on fine even through the LCD AC plug when connected to the back of the PSOne but the screen itself doesnt seem to power on nor do I get any sound.

Is this an issue with the improper amount of amps being provided by the power supply? I hear that the PSOne LCD requires 3.0amps and between 7.5 - 9v in order to power up.
I've taken the screen apart and their doesnt seem to be any damage or anything suspicious to the LCD screen itself and it seems to just be a power issue.
Can someone give me some insight here? Is the problem straining purely from the incorrect power supply? Does anyone know where I can get an appropriate power supply for the PSOne LCD screen?
I'd love to get this thing working

Thanks!
Ghudda

 

I think i'm going to purchase an SCPH-121 power supply (3amp version) off eBay and give it a shot. I don't really see what else could be wrong with the screen itself.

 

Check the fuses first. That's the most common problem with these screens.

See this image. The fuse labeled "PS1" is for the backlight and "PS2" is for the board power. One or both of these fuses could be blown.

 

"In case of emergencies, bypass this part"
A really smart tip. Congratulation who has wrote that....

 

Ah... Yeah... About those fuses...
Any suggestions?

edit: I see that it's suggested to solder bridge the PS1 fuse but do I do the same for the PS2 fuse?

 

Bridge them both and use an official PSU so you won't be in danger of over volting it.

 

Thanks for the help!
Bridged both the PS1 and PS2. Not the most beautiful soldering job and the PS2 did not want to bridge so I ended up using a tiny cut of wire in order to make the connection but I think it'll work.

I'll post an update once the official PSU gets here sometime in the next couple of days.

 

no fuses

I am interested if the screen will come up

 

I as well. Is there a reasonable way to actually replace the fuses instead of depending on this one time solder fix? I've never replaced fuses that small so I'm not sure if i'd have the ability to do it if it is relatively easy, then it'd be nice to ensure that the screen doesnt blow up on me in future. Are those fuses readily available?

 

Fuses job is don't protect aganist overvolting, but shorts. That's different.
If there's a short on the main motherboard, official psu or not, you end burn another componet. Making your fix job harder.

If you want replace fuses you need to find the right value and resolder them.

 

They appear to be 2A 0603 SMT fuses.

My guess is it's one of these:

http://www.digikey.com/product-detail/en/ERB-RE2R00V/P15126CT-ND/2796824

The best way to install them is to use a hot air tool with a small nozzle - if you don't have one, then put a small amount of solder on each pad, put a little bit of flux on it and then position the fuse above the pads with tweezers and melt the solder on each end with a fine soldering iron.

Once both ends are attached, you can touch up the soldering - but don't try to solder just one end without holding the part - the surface tension of the solder is quite high, and the parts can just flip up and stand vertically in a phenomenon known as "tombstoning".

 

Epic. Thanks for the reply, TriMesh i'll try to look further into this. Is there a proper way to determine EXACTLY which fuse to use? I'll ultimately make sure the solder job does the trick first but for longevity sake, look into replacing the fuses themselves later down the road.

 

You can't tell exactly without access to the parts list - but the "N" on the fuse is a standard code for 2A and the package size looks like 0603 from the photo. SMT fuses are generally fast blow since they have so little thermal inertia, and I picked Panasonic as the vendor because they seem common in Japanese designed equipment. I have a pretty high level of confidence that the part I linked to on Digikey is the right one.

 

Awesome well they're dirt cheap anyways so maybe i'll order a few of them at some point and give it a shot. Thanks for the information. I appreciate it! Will update when the PSU gets here on Saturday.

 

So the PSU got here a day early and still no power. I'm going to touch up my soldering job and see if I can't get it working.
Something to take not of is that originally, I was able to have the screen plugged in and have my PS2 PSU plugged into the back and the console would power up while the LCD would not. Now if I have the screen plugged in at all with a PSU plugged into it, the console won't even power up.

Any other things that I should try? The CV64 points that are right next to the PS1/PS2 fuses, do I need to do anything with that (such as solder bridge it?)

EDIT: On the PS1/PS2 fuse side of the board, around each of the screw points, there is a fuse connected to the (ground?). Anyways at 3 of the 4 points, there are fuses but at one of them (B1), one doesnt seem to be present. Is this on purpose? Should I bridge those two points? It's just something that stood out.

Thanks again

 

Get a multi meter and star checking components to see what might be faulty. If you need a cheap digital multi meter head to Harbor Freight they sell them for around $7, I bought a few since they are so versatile in a number of things.

 

Why do you think B1/B3 are fuses? Doesn't look like fuses at all (and Sony usually marking them with PS). Better get multimeter, and check basic things.

 

This is after you replaced the fuse with a solder bridge?

In that case, it seems that the fuse was blown, but the reason was that something later in the circuit was taking excessive current - now you have bridged the fuse, it's making the PSU shut down. Try removing the solder bridges and see if it powers up then.

 

When a fuse blows it blows for a reason. Bypassing it is just asking for trouble and so long as you don't mind likely killing the screen bypassing is a fine idea.

Now as for a way to replace the fuse? Do so 1:1 or solder two wires to a fuse holder and solder those wires to the pads. It really isn't that hard to do this properly and if you're hemming and hawwing over how to do it "properly" you're in the wrong hobby. No offense intended but this is reality especially if you move into fixing up PS1s and PS2s with oodles of fuses each.

 

Dear Ghudda
I just picked up a psone with the lcd screen. The screen will not power on at all, I have the official 7.5v grey box power supply with it and that powers the console just fine. If I bypass the screen and just play the console through a tv with the AV multi out, I can sit there and play the console all day... just not on the lcd screen. no audio, no video...nothing. Any insight into common problems or solutions? Thanks for reading