Noob question - powering PSone screen

[excowboy]

I just want to test the screen I have but I don't have the original power cable. I tried using a multi-voltage adaptor at 6v and 9v (I know the screen is 7.5v) but the screen wouldn't power on?
Wonder if it's knackered as I bought it off ebay a couple of months ago and have only now got round to starting my build.
Do I just need to try it with a 7.5v adaptor? Thoughts?

On the plus side the duff NES I bought for five quid now works after disabling the lockout chip

[excowboy]

K, I've tried a 7.5v and no dice so I guess I've got to get the guts out and see what might be up. Any suggestions? At all?!

[excowboy]

Bump...
Any suggestions?

[excowboy]

Ok, so I've opened it up and tried wiring the power straight in (using the built in socket and powered through an AC adaptor). Would really appreciate anyone's thoughts - do you think the screen is dead? I'm getting pretty lonely in this thread

[hailrazer]

Does the screen power up then go blank ?

If so this will fix it :




If it has no power at all take out this fuse and bridge it with solder :

[sam_thornley]

Those fuses can blow from wrong polarity or sometimes overvoltage (rarely though). Be carefull not to short out the ground, as there is lots of grounding around the fuse area. Also make sure that you have a video source hooked up . The screen can run on voltages from around 6.8-8v. Don't power it on anything higher than 8v, as there are parts of the screen that will fry if the voltage is too high.

I've blown PSone screen fuses on one of my projects before, shorted the fuses and it came back to life.

[excowboy]

K, thanks for these tips

I bridged the fuse as per Hail's suggestion and the screen worked! Sort of! As in, I plugged in power (with no video input attached) and I could see the screen boot up and go darker. Result!

Then, I tried powering it off of the battery I'm hoping to use (pretty much one of these
http://cgi.ebay.co.uk/TAMIYA-TRAXXAS-R- ... 2a05c4ce7d" onclick="window.open(this.href);return false;) and there was a brief sizzling and some smoke as the wire's attached to the screen pins magically desoldered themselves.

Now, assuming I didn't reverse the polarity *cough* is that because the battery is too powerful or cos my wiring was a bit weedy?

On the off chance I did screw the polarity, is the screen now toast?

Thanks!

[sam_thornley]

If you reverse the polarity while the fuses are shorted, the screen will fry. There are parts of the screen that run of 7.5v directly, the backlight and the AN2526NFH chip. Thats why there are fuses on there in the first place.

The battery that you're using is fine. I've used the same battery in 4 of my portables so far.

[excowboy]

Thanks Sam, that's what I figured...

Will have to wait til saturday to try it out and see if there's any life in the old thing

[Musturd]

kbar accidentally hooked up our screen with reversed polarity.
So now it will not turn on.

I'm hoping bridging the fuses will fix the screen.



On this pictured which are the fuses?

Just the ones with the 'N's on them?
Just the leftmost one in the picture?
The three similar looking things (including the one without the 'N' on it)?

[sam_thornley]

Correct,
The leftmost one in the picture. The ones with the 'N's on them. They are SMD type micro fuses. The one on the left is for the LCD controller, and the other one is for the backlight.

[excowboy]

Ok, it took me a while to find the time to do this but I rewired the the power to my screen, and taking care NOT to reverse the polarity it still seems to power on as before (i.e. can see that the screen goes black, like it's on)

So, I've then tried to connect a signal (direct from my NES) but that doesn't seem to be getting through. This is using a direct signal from the NES Video out to the 'EXT_V' pad on the back of the screen. No dice. I've connected the ground also with no joy.

Thoughts? Thanks!

[kbar]

So I fixed the fuses, not thanks to musturd. So anyways, now how do we replace the fuses, and what kind of fuses should we buy?


Thanks

[NesMario]

Hi,

Hello what must I do with the two points that are displayed in this picture?

[Hifeno]

bridge them with solder.