Hello, I'm having some issues doing this.AndyA wrote:Just for clarification, if all you want to do is use a 5v input with the existing cable then all you need to do is cut the red wire coming in and solder it to the hole indicated for the red USB wire.
The reason for removing the chip is so that the voltage regulator doesn't have power on it's output with nothing connected to it's input. This is a precautionary move, it may not be necessary but is good practice.
Correct.Wully wrote: Hello, I'm having some issues doing this.
I cut the red wire on the power/video connector on the board and soldered the red wire to the 5v input in your image. and then plugged the power/video connector back in. I left the ground wire as is, is that correct?
I just tried the exact modification you had made on a new display and it worked fine for me.Wully wrote: And on the dc power jack that comes with the display, I wired a USB connector to the end of it.
When I try to power it up the screen flashes on then off again. This is using a 5v 1A USB wall charger.
Yes, an initial flicker then blank for ~4 seconds before it wakes up.Wully wrote:Could I also confirm, when the display is powered on, initially it flickers on then off again. Then after 3-4 seconds it detects the video input (From input 1 or 2) and switches on. Is this 3-4 second delay consistent with your models?
The simple way is a total of 4 parts.Foggy wrote:I would like to be able to switch the display off using GPIO. Can any one suggest a circuit for doing this.
One thing I discovered was that changing the screen resolution to something closer to the displays native settings made text far more readable. Obviously making the text larger helps a lot but it also seemed to reduce the flickering nature of the image I was seeing.marcialr wrote:Everything is working fine! the resolution is not good to do much text coding as i think it will tire your eyes very quickly but for some quíck and dirty things should be fine. Haven't tried video!
The Vgs is fine, a lower threshold (meaning closer to 0 since for the p channel part it's negative) isn't normally a problem.Foggy wrote:Would some thing similar to this work and adding the resistors as you have shown.
I accept that Vgs does not have exactly what you suggested, but if I am on the right track then I will keep looking.
http://www.irf.com/product-info/datashe ... rf7507.pdf
Nice job Andy, I was coming on to ask if anyone had a solution for the small text.AndyA wrote: framebuffer_width=350
I came up with these settings via trial and error and what seemed to look better to me rather than any scientific objective method so your mileage may differ but it's certainly worth having a play.
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#16:9 aspect ratio sdtv_aspect=3 #The devices resolution is 640x480, half of that provides good readability framebuffer_width=320 framebuffer_height=240 disable_overscan=0 overscan_left=-30 overscan_right=-30 overscan_top=-30 overscan_bottom=-30