Add on fan to Lilliput -- Power ?? where ??

Don 944 LA · 01-21-2005, 10:07 PM

Well, I added a fan to the back of my Lilliput..

Does anyone know a good spot to draw power from ( 12v ) ??

I was going to just solder it to the power connector, but then it would run whenever there is power to it. I would prefer to have it run only when it's turned on.

Anyway here's some pics

Don 944 LA · 01-21-2005, 10:08 PM

and another

Don 944 LA · 01-21-2005, 10:09 PM

here's the style board that I have

Don 944 LA · 01-23-2005, 04:20 AM

well, I did solder the leads onto the board where the power comes in. At first I thought that I fried it, so I undid it, then it still wouldn't turn on.....

Turns out that the ribbon cables weren't " Just Right "... so I finally got it to work again...... and MAN IS IT COOL.. Literally....

I have 2 other lilliputs that I will do this to. I just wish that I had done it before the Touchscreens got out of whack.

Also, I have the fan blowing out so that it draws air into the thin slots around the outer side of the case....

I would recomend this to everyone !!!!! total cost $10 for small 12v fan.

(hint) make sure circuit board has clearance before hot glue dries

miztahsparklez · 01-23-2005, 05:06 AM

hmm, i think it would work better if the fan would blow inside no?

sikora · 01-23-2005, 05:51 AM

Why do these screens need extra cooling?

I think the fan would be better blowing in.

Curiosity · 01-23-2005, 06:11 AM

That resistor on the top left is 12V on the bottom when it's on and when it's in standby. Everything seems to be on when it's in standby. Oh, not the one next to the big inverter coil (I think that's the high voltage side) but just below it right on the edge. Don't know if it can handle the power though and I guess I'm a little late.

Kalavera · 01-25-2005, 12:17 PM

I have to agree with Don on the air being pulled through. It'd be quieter and probably more effective this way. Anything that'll extend the life of the screen is worth a try, especially something this easy.

ddogg_777 · 01-25-2005, 12:27 PM

Quote: Originally Posted by miztahsparklez

hmm, i think it would work better if the fan would blow inside no?

No. Fans actually heat up the air as it passes through the blades. You always want the fan to suck so that the hot air from the blades is exhausted. The only reason you would want a fan to blow on something if it was wet. Evaporation comsumes a lot of energy, thus cooling whatever is wet. This is why you sweat and you feel cool when a fan blows on you. However, electrical components don't sweat.
BTW, I was actually gonna do this to my Lilly too. Thanks for the pics Don!

Skipjacks · 01-25-2005, 12:41 PM

I put a cooling fan, a small one, under the screen to suck out the hot air from the empty space behind the screen. It doesn't suck the heat directly off the circuit board in the lilliput, but it does pull the hot air out from the cavity behind the screen something fierce. I was suprised how much air this little fan could move.

There's no way this design is as effective as the bigger fan right on the circuit board, but if for some reason you don't want to do that, this gets the job done better than nothing.

ddogg_777 · 02-04-2005, 03:03 AM

I was thinking of adding a fan in the same place as Don an then hooking the fan to the speaker output. My fan is a 12V 0.06A fan so it draws less power than the 32ohm, 1W speaker that I took out. I want to do this because I can then use the volume buttons in the front to lower/raise the fan speed. As you technicals might guess, I need to hook up a signal to the audio input. My question is, how high of a signal? 1V, 3V, 5V, 12V?? My theory is to solder up a wire from the audio input to the power input, that way the fan will come on whenever the lcd is powered.

ddogg_777 · 02-04-2005, 03:28 AM

Here is a link to the IC amplifier on the board: http://www.semiconductors.philips.co...7052AT/N2.html

ddogg_777 · 02-04-2005, 03:51 AM

DOH! Scrap that idea, the volume buttons only work in video1/2, not vga.

mox · 06-01-2005, 05:41 AM

Quote: Originally Posted by ddogg_777

DOH! Scrap that idea, the volume buttons only work in video1/2, not vga.

Now that audio can be enabled in VGA-mode through the hidden factory settings menu, I will look into the idea of turning the volume buttons into a fan speed controller. It depends on whether the signal on pin 4 of the TDA7052 ("DC volume control") can deliver enough current to power a 40mm fan directly. I'd suggest adding a darlington as a buffer anyway.