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by Krebsy
Tue Oct 16, 2012 9:53 am
Forum: Other projects
Topic: Modifying a 3.5" car display for USB power.
Replies: 453
Views: 233765

Re: Modifying a 3.5" car display for USB power.

For the screen, the best option is to wire up 8 AA batteries in a holder to the red and black feeds for the screen, then take the back off and probe against any of the exposed capacitor legs with a voltmeter. When you find +5v, that's the spot to attach the power feed to. Likewise, when connecting u...
by Krebsy
Wed Oct 03, 2012 12:50 pm
Forum: General discussion
Topic: Formatting/Restoring an SD Card?
Replies: 8
Views: 16398

Re: Formatting/Restoring an SD Card?

I was tearing my hair out over this earlier as sdformatter wouldn't return the card back to stock state. The quickest and easiest way I found to do the formatting? I shoved the card into my digital slr (which stated 55mb) and then low level formatted it in there. 30s later it was showing the full 3....
by Krebsy
Mon Oct 01, 2012 10:49 am
Forum: Troubleshooting
Topic: Randr not working
Replies: 12
Views: 26142

Re: Randr not working

I'm getting a similar issue now running this with my 3.5 inch screen over the composite connection. This was working last night with no problems and all I have done today is modify the fstab file (then backed the changes out) to try and access files on a USB stick. It's driving me nuts as the pi is ...
by Krebsy
Thu Sep 20, 2012 9:19 pm
Forum: Other projects
Topic: Modifying a 3.5" car display for USB power.
Replies: 453
Views: 233765

Re: Modifying a 3.5" car display for USB power.

Following a bit of probing around with a volt meter I managed to find a +5v pin on the board (off the back of one of the capacitors) so spliced the red wire in with a blob of solder. Fired up the screen and it immediately cut out :( , but it turns out it was just the power jack plug not being togeth...
by Krebsy
Thu Sep 20, 2012 4:00 pm
Forum: Other projects
Topic: 3.5" TFT LCD and debian squeeze
Replies: 9
Views: 12061

Re: 3.5" TFT LCD and debian squeeze

This'll do the trick...
http://uk.farnell.com/xp-power/jcd0605s ... =lookahead

Or hack the screen to take out the 12 to 5v regulator.

K.
by Krebsy
Thu Sep 20, 2012 3:53 pm
Forum: Other projects
Topic: 3.5 TFT Lcd Screen Problems.
Replies: 21
Views: 10521

Re: 3.5 TFT Lcd Screen Problems.

Setting up I have the Pi in a case with a 5v mobile phone emergency power pack supplying all the juice (rated at 24hrs of video playback for the iphone so should be powerful enough) and I too have been struggling to get a screen to run. The in-car screen can be quickly fired up with 8xAA's in a hold...
by Krebsy
Thu Sep 20, 2012 3:38 pm
Forum: Other projects
Topic: How do I power Car LCD Monitor?
Replies: 34
Views: 31531

Re: How do I power Car LCD Monitor?

I do have a potentially spare 5v to 12v dc-dc converter I was going to use to take the 5v power from my 2A Ipad charger to run both the Pi and the in-car screen (or off the "Emergency" mobile battery pack). I think I'll hack the screen though as AndyA suggests and rip out the 12v to 5v regulator ins...
by Krebsy
Thu Sep 20, 2012 3:33 pm
Forum: Other projects
Topic: Car Rearview Screens
Replies: 9
Views: 5507

Re: Car Rearview Screens

I'm also going to crack my screen open and either rip out the regulator or use the (seemingly pointless now) 5v to 12v DC-DC converter I spent a week sourcing.. :)

K.
by Krebsy
Thu Sep 20, 2012 3:30 pm
Forum: Other projects
Topic: Modifying a 3.5" car display for USB power.
Replies: 453
Views: 233765

Re: Modifying a 3.5" car display for USB power.

Are the red and white cables within the main pre-existing loom the +ve and -ve 12v feeds respectively? It seems to say that in step 7. If so, I guess I could slice those off at the white plug end, solder them into the holes on the PCB and replace the DC jack past the fuse with a USB conector.... K.
by Krebsy
Thu Sep 20, 2012 3:07 pm
Forum: Other projects
Topic: Modifying a 3.5" car display for USB power.
Replies: 453
Views: 233765

Re: Modifying a 3.5" car display for USB power.

thanks for the details on this. Wh I didn't see this article before ordering more kit.... I had a feeling the screen (I have the same one) would run off 5v if only I could get the wiring sorted out.. :). I ended up going to Element14 and ordered a 5v to 12v Dc-DC converter (rated to 0.5A output) and...

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