Breakdown of the Galileo 5" LCD

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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Jason
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Breakdown of the Galileo 5" LCD

Post by Jason » Tue Dec 29, 2009 7:49 pm

Moved here for visibility...
thewizdawg wrote:Anybody ever buy one of these?

http://www.overstock.com/Sports-Toys/Ga ... u=11961514

I'm looking for a 5 or 4.5 inch screen that has a better viewing angle than the PS1 and runs at 5 volts.
Where did you see '5 Volts'?

The screen I got comes with a 12v 800mA wall wart and a car cigarette lighter adapter.

(Seeing as I seem to have ruined my PS1 screen... I decided to give this one a look over)

The following is a list of pictures on my website showing the disassembly of the Galileo screen:

WARNING!!! IMAGES ARE HUGE (3072x2304 pixels)! NOT 56k FRIENDLY!!!
You've been warned!

http://www.oslb.net/Galileo/gedc0630.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0631.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0632.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0633.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0634.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0635.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0636.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0637.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0638.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0639.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0640.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0641.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0642.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0643.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0644.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0645.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0646.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0647.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0648.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0649.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0650.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0651.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0652.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0653.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0654.jpg" onclick="window.open(this.href);return false;
http://www.oslb.net/Galileo/gedc0655.jpg" onclick="window.open(this.href);return false;

Sorry for the blurry images... my 7MP camera does not like my unsteady hands.

The LCD itself is a bit thicker than I'd hoped (about a quarter inch)... but that's ok for my project... might cause issues for others. I really liked the longish ribbon cable connecting the LCD and video board... makes it much easier to re-route as needed.

There are brightness and contrast controls built into the video board with nice right-angle tact switches.

The video board is almost entirely through-hole pcb construction (the lone exception appears to be a voltage regulator IC), which should make this board hackable by even most novices.

As an extra treat all the components have their value silkscreened next to them.

The main IC on the video board is a Philips OM8361 (datasheet: http://www.datasheetarchive.com/OM8361-datasheet.html" onclick="window.open(this.href);return false; ). Edit 1/1/2010: Note: this appears to be the same chip with a different pinout/form factor: http://www.audiolabga.com/pdf/TDA8362.pdf" onclick="window.open(this.href);return false;

The second chip appears to be a Microchip part (as in PIC)... it read "CF745 -04/P". Edit 1/1/2010: I found the datasheet for this chip, I was right... it is a Microchip part (PIC16C5X to be exact). Datasheet here: http://pdf1.alldatasheet.com/datasheet- ... CF745.html" onclick="window.open(this.href);return false;

The LCD itself is a Sharp "DUNTK2655TPZZ"... I can't find a datasheet for it.

There are two ICs on the board: "LZ9GF29" and "IR3Y26A"... only the latter of which I can find a "datasheet" for (it's not even a real datasheet).

Edit 1/1/2010: IR3Y26A Datasheet: http://pdf1.alldatasheet.com/datasheet- ... 3Y26A.html" onclick="window.open(this.href);return false;

The LCD does use a CCFL tube... but it looks like it'll be fairly easy to do the LED mod on.

Amusingly enough... the unit I got has the fuse on the CCFL circuit bypassed with a tiny piece of wire. Probably the reason for the refurb status.

Overall... I'd say this unit should be very easy to mod and use in handhelds... however the unexpected thickness of the LCD, the fact that the face of the LCD is glass (not plastic), and the power consumption of this beast, may put off many of our fellow modders.

Enjoy.

Jason
Last edited by Jason on Fri Jan 01, 2010 7:13 pm, edited 3 times in total.

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hailrazer
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Re: Breakdown of the Galileo 5" LCD

Post by hailrazer » Tue Dec 29, 2009 8:43 pm

Thanks for the pics.

But........

You left out some VERY important facts.

1. How does it compare image quality wise to the Psone Lcd.
2.What's the lowest Voltage it will run properly at.
3.What is the current draw.
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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Tue Dec 29, 2009 9:16 pm

hailrazer wrote:Thanks for the pics.

But........

You left out some VERY important facts.
I'll try to answer these...
hailrazer wrote:1. How does it compare image quality wise to the Psone Lcd.
I'm not a videophile... (eyes aren't that good)... however... overall I'd say it compares favourably.
The main drawback to a glass LCD is the reflectivity of the glass itself, as seen here: http://www.oslb.net/Galileo/gedc0656.jpg" onclick="window.open(this.href);return false;

There's a bit of a 'roll' effect when turned on without a signal... but raising the brightness takes care of that.
hailrazer wrote:2.What's the lowest Voltage it will run properly at.
IDK, I don't have a variable PSU. However... there are two voltage regulators on board a 7808 and a 7805... (the 7808 appears to be the primary)... will that help?
hailrazer wrote:3.What is the current draw.
If I'm measuring right, it's 17.5mA when turned on... but I doubt that's right... since the backlight shuts off everytime I touch the power input terminals with the meter's leads.

Hope my answers helped.

Jason

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hailrazer
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Re: Breakdown of the Galileo 5" LCD

Post by hailrazer » Tue Dec 29, 2009 9:38 pm

Jason wrote:
If I'm measuring right, it's 17.5mA when turned on... but I doubt that's right... since the backlight shuts off everytime I touch the power input terminals with the meter's leads.

Hope my answers helped.

Jason
When measuring amperage. Set the meter to the amperage setting. Plug the leads into the appropriate amperage spot. Hook up ground. Then put the black lead on the power supplies positive wire, and the red lead on the area on the board where power + goes. The screen will turn on and the meter will show numbers. Read the meter :)
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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Tue Dec 29, 2009 10:01 pm

hailrazer wrote:When measuring amperage. Set the meter to the amperage setting. Plug the leads into the appropriate amperage spot. Hook up ground. Then put the black lead on the power supplies positive wire, and the red lead on the area on the board where power + goes. The screen will turn on and the meter will show numbers. Read the meter :)
Yeah... I know... I'm an idiot...


I forgot that you're supposed to measure current in series with the circuit... not in parallel. DOH!

Anyway it's been along time since I last messed with measuring current... so forgive me for posting all of this... but it's meaningless to me now.

I had to use the 10A probe input due to lack of response from the mA probe input on my voltmeter... the mA input is fused while the 10A input is not... so I suspect I may have blown that fuse.

Anyway... take all of this with a grain of salt or three...

This is what I get measuring Amps (DC) (readings taken from all A[dc] settings):
2m = .053
20m = 0.53
200m = 05.3
10 = 0.53

Interestingly when the power has been turned off via the switch... the wall wart still seems to provide:
2m = .001
20m = 0.01
200m = 00.1
10 = 0.01

As I said... I've long ago forgotten how to read those numbers... feel free to teach if you have the time.

Jason

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Re: Breakdown of the Galileo 5" LCD

Post by hailrazer » Tue Dec 29, 2009 10:08 pm

Looks like 530mA

Thanks :)
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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Tue Dec 29, 2009 10:16 pm

hailrazer wrote:Looks like 530mA
Given that the majority of that is probably the CCFL... is that number good or bad?
hailrazer wrote:Thanks :)
No problem.

Glad I could help.

Jason

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Re: Breakdown of the Galileo 5" LCD

Post by hailrazer » Tue Dec 29, 2009 10:24 pm

Jason wrote:
hailrazer wrote:Looks like 530mA
Given that the majority of that is probably the CCFL... is that number good or bad?
hailrazer wrote:Thanks :)
No problem.

Glad I could help.

Jason
Well was that with anything running on it ? And did you have sound playing. If you did it's good, if not , it probably will be a lot higher if you did.
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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Tue Dec 29, 2009 10:33 pm

hailrazer wrote:Well was that with anything running on it ? And did you have sound playing. If you did it's good, if not , it probably will be a lot higher if you did.
The Galileo doesn't have audio.

And no... I did not have video running to it while testing. I could retest with video running if you like... Just tell me which Voltmeter setting you want me to use.

Jason

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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Tue Dec 29, 2009 10:50 pm

I went ahead and tested it again with video running.

The values stayed constant (exactly as above, even during periods of intense graphics)... not even the slightest wavering.

That's a touch odd... no?

Jason

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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Fri Jan 01, 2010 5:44 pm

From what little I can read of the OM8361 datasheet... it looks like it'd be fairly easy to do a RGB mod on this screen.

From the IR3Y26A datasheet... the LCD itself uses RGB inputs.

Jason P Herbert

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Re: Breakdown of the Galileo 5" LCD

Post by eagle5953 » Fri Jan 01, 2010 6:17 pm

Jason wrote:I went ahead and tested it again with video running.

The values stayed constant (exactly as above, even during periods of intense graphics)... not even the slightest wavering.

That's a touch odd... no?

Jason
As most of the power is the backlight, I wouldn't expect it to vary much when displaying video. The only thing that would change the draw is how high the brightness is set to.

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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Fri Jan 01, 2010 6:41 pm

eagle5953 wrote:
Jason wrote:I went ahead and tested it again with video running.

The values stayed constant (exactly as above, even during periods of intense graphics)... not even the slightest wavering.

That's a touch odd... no?

Jason
As most of the power is the backlight, I wouldn't expect it to vary much when displaying video. The only thing that would change the draw is how high the brightness is set to.
This was measured both times with the backlight set on the highest possible setting.

Jason

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Re: Breakdown of the Galileo 5" LCD

Post by thewizdawg » Fri Jan 01, 2010 9:18 pm

Thanks for the info and I hope this works out for you!

I was looking for a 4.5 or 5 inch screen that runs at 5 V, I didn't say this did. This probably needs 10 V.

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Re: Breakdown of the Galileo 5" LCD

Post by Jason » Sat Jan 02, 2010 4:08 am

thewizdawg wrote:Thanks for the info and I hope this works out for you!

I was looking for a 4.5 or 5 inch screen that runs at 5 V, I didn't say this did. This probably needs 10 V.
From the datasheets I was able to find on the 7808... you're probably right re: 10V minimum.

However... if you removed the 7808 regulator and used an 8V power supply (well regulated... ie., not your standard wall wart)... you could reduce the overall system voltage further... not that it's really necessary.

Good luck finding the screen you want.

Jason

P.S. - Just noticed your location is Ohio... where in Ohio are you? Anywhere near the Dayton/Fairborn area?

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