What can I do to fix this screen?

If you're making a portable you probably need something to watch it on. (Unless you want to guess what's happening in the game, but I wouldn't advise that) Anyway, this forum is your "Hacking a pocket TV/screen" one-stop solution. Share your experiences and knowledge here.

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pLover
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Joined: Fri Jul 31, 2009 3:15 pm

What can I do to fix this screen?

Post by pLover »

On ModRetro, I posted a few topics, but all I keep getting are totally different answers that no one confirms, and are nothing like eachother! So I'm going to Summarize all of the topic here, and hope I can get a better answer.


First, It won't show the game. The screen stays off when it should be showing the game.
Second, the 10 ohm resistor so hot is melting the glue, and it's smoking.

I wired it like this (all wires are ribbon cable, if that matters):

The top right negative lead (TRN) is soldered to a ribbon cable going to the bottom right negative lead (BRN).
The BRN is then going to the bottom left negative lead (BLN), which also goes to the ground.

So the TRN has one piece of cable on it.
The BRN has two.
The BLN also has two.
The ground has one. BUT, it's laying flat, rather than passing through a hole.

Now the Top Right Positive lead (TRP) is going to one side of the resistor (RS1).
The Bottom Right Positive lead (BRP) is also going to the RS1.
And so is the Bottom Left Positive lead (BLP).
The other side of the resistor (RS2) is connected to the regulator it tells you to connect to in the book.

The TRP has one piece of cable on it.
The BRP has one piece of cable on it.
The BRL has one piece of cable on it.
The RS1 has three pieces of cable on it.
The RS2 has one piece of cable on it.
The Regulator has one piece of cable on it.

Image
Obviously, the brown thing is the 10 ohm resistor, and obviously, the square is the screen, and the circle is the circuit board. The blue things are the LEDs. The Blue lines are positive leads, and red is negative. Green lines are what connect negative leads, and orange connect positive. The dark purple line is the wire to the regulator, and the grey lines are the resistor's tabs. Lastly, the grey block is the ground.

Also, for the resistor, is there a positive side, and a negative side? If so, that may be the problem

I can't figure out what's wrong. Could it be that the solder is blocking the leads from the wires on some things? Or does the solder still carry a connection? Could I have it plugged into the PSone screen wrong? Could something be wrong in the screen's lightbox, or something? Or is it something more simple, like after I take out the transformer, I can't hook it up to the PS1?

Some of you are saying to wire resistors to each LED, rather than each one to just one resistor. Some are saying to wire the regulator to the power plug, and then get rid of the resistor, but then what would I do about the LEDs? Some are saying just to change the number of ohms the in the resistor. And everyone says that after I do [insert above operation here], that all of my problems will go away.


But who's right? And which one can I test sooner? And will someone PLEASE help me more than the "help" I'm getting!? (For everyone who's tried to help me, nothing's wrong with what you're saying, it's just that no one is confirming it, and others are saying totally different things.)
Designer noob
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Re: What can I do to fix this screen?

Post by Designer noob »

kk, lol does your screen turn black likes it getting power?

Before you turn it on it should be kind of brownish. When you turn it on does it go black?
The N64/GBA Remix
Image
Image ............................................................................................................................................. Xbox360 WVI
pLover
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Re: What can I do to fix this screen?

Post by pLover »

It's never brown.
Designer noob
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Re: What can I do to fix this screen?

Post by Designer noob »

Well, when you turn it on it should kind of flicker and turn very dark black more then whens it off.
The N64/GBA Remix
Image
Image ............................................................................................................................................. Xbox360 WVI
bicostp
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Re: What can I do to fix this screen?

Post by bicostp »

Sorry for the upcoming barrage of questions, but they'll will help narrow the scope of the issue so we can figure out what's wrong. ;)

Can you post good pictures of the screen board with the modifications, front and back, please? (This kind of thing can be awkward to describe with diagrams. :lol:)

Did the screen work before you LED modded it?

If you press the 'Brightness' and 'Volume' buttons, does the OSD appear?

Did you check all the obvious stuff? (LED ploarity, battery voltage, does sound work, etc?)

If you take really bright flashlight and shine it on the screen close, can you see anything?

Does anything at all happen when you apply power to the screen?

Are you sure you connected the LEDs to the right side of the power regulator?

Did you try bypassing the fuse labelled PS1 on the sceen motherboard?
pLover
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Re: What can I do to fix this screen?

Post by pLover »

I'll check all of those, but something really quick. I took off the transformer, and it's hooked up to the wall power. Could the problem be that it's getting too many volts and need power from the batteries?
bicostp
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Re: What can I do to fix this screen?

Post by bicostp »

Depends on what batteries you're using. What's their voltage and mAh rating?
pLover
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Re: What can I do to fix this screen?

Post by pLover »

I'm not. I plugged it into the wall. Since I took the orange transformer out of the top, could that be the problem?
bicostp
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Re: What can I do to fix this screen?

Post by bicostp »

What's your power adapter's voltage and mAh rating then? If you're using the adapter that came with it, it should be working.

That orange transformer on the top just runs the original CCFL backlight. Removing it is fine when you do the LED mod.

Are you following the directions from Ben's book, or an online guide? (If the latter, link please?)
pLover
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Re: What can I do to fix this screen?

Post by pLover »

Ben's book. And yes, it was the one coming from it.
pLover
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Re: What can I do to fix this screen?

Post by pLover »

bicostp wrote:Sorry for the upcoming barrage of questions, but they'll will help narrow the scope of the issue so we can figure out what's wrong. ;)

Can you post good pictures of the screen board with the modifications, front and back, please? (This kind of thing can be awkward to describe with diagrams. :lol:) I'll try to get a video up.

Did the screen work before you LED modded it? Yes.

If you press the 'Brightness' and 'Volume' buttons, does the OSD appear? What's the OSD? Is that the gameplay on the screen? If so, no.

Did you check all the obvious stuff? (LED ploarity, battery voltage, does sound work, etc?) I have no battery, and it's not hooked up to the sound, but I checked the LED polarity.

If you take really bright flashlight and shine it on the screen close, can you see anything? I haven't tried but I'll try to find a flashlight. I'm at my grandma's house, and she's not that... with it.

Does anything at all happen when you apply power to the screen? The resistor (Now changed to a 22ohm resistor) gets really hot and melts the glue. That's all I can see.

Are you sure you connected the LEDs to the right side of the power regulator? It's the side that it says to in Ben's book.

Did you try bypassing the fuse labelled PS1 on the sceen motherboard?No, how can I do that?
bicostp
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Re: What can I do to fix this screen?

Post by bicostp »

I'll try to get a video up.
No, not video. High resolution still pictures so we can actually see what's going on.

What's the OSD? Is that the gameplay on the screen? If so, no.
The OSD (On-Screen-Display) is the built in green display that comes up when you adjust the brightness and volume with the buttons.

No, how can I do that?
Put a blob of solder over it so it covers both sides. I think the book tells you which one to use, but it's also silk-screened on the screen motherboard.
pLover
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Re: What can I do to fix this screen?

Post by pLover »

bicostp wrote:No, not video. High resolution still pictures so we can actually see what's going on. I'll do both, just because the wiring is kind of complicated on mine (they're all tangled, and stuff) so I can explain how I did things without typing walls of text.

The OSD (On-Screen-Display) is the built in green display that comes up when you adjust the brightness and volume with the buttons. So if it's working, the screen will turn green for a split second (or longer) when I hit a button? If that's it, than no, the OSD doesn't show up.

Put a blob of solder over it so it covers both sides. I think the book tells you which one to use, but it's also silk-screened on the screen motherboard. So, coat the whole thing in solder, or just both sides of the thing on the motherboard? And no, the book doesn't say how.

Alright, so once I get more detail on how to bypass the thing, I'll do that, and if it works, I'll let you know. If not, I just won't mention it.
pLover
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Re: What can I do to fix this screen?

Post by pLover »

Alright, it turns out there's one bad connection for the negative LED leads, so I'm going to fix that. When you jiggle it, the LEDs come on. But I'm still not getting any video into it. How can I fix this?
64M320N3
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Re: What can I do to fix this screen?

Post by 64M320N3 »

No stills, no video, no anything.
So in other words, we still can't help you.
Making stuff with my new beautiful CNC machine!
Would you like a professional looking custom case for your portable? I may be able to help you. Check out this link:
http://forums.benheck.com/viewtopic.php?f=13&t=32724
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