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by soundsystem83
Sun Apr 27, 2014 11:43 am
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

I did try it with an hdmi to dvi cable into my computer monitor but got no signal at all. My first pi did work a bit through the tv but it kept hanging and was unstable, which I traced to the power supply issue. So maybe it is another faulty pi... seems like very bad luck to get two dud ones though....
by soundsystem83
Sat Apr 26, 2014 6:29 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

Still green and flickery with only hdmi_safe set
by soundsystem83
Sat Apr 26, 2014 6:14 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

The hdmi connector is definitely in as far as it will go at both ends. I've tried it with the case on and off as I wanted to check the test points to eliminate power supply issues.
by soundsystem83
Sat Apr 26, 2014 6:04 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

The TV only has one hdmi input, and other devices work fine in it... it could be that the connector is not seated properly in the pi. Is there anything I can do to check/fix that? On the other hand, the tv does not seem to be sending valid edid data to the pi. Not sure if that's the same issue as th...
by soundsystem83
Sat Apr 26, 2014 5:51 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

I've already tried that... on 11 the colours are about right but there is still a lot of interference, and the signal sometimes drops completely. 10 is worse, anything less and it's all green. Anything higher than 11 and I get no signal at all.
by soundsystem83
Sat Apr 26, 2014 5:17 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

I'm using short length HDMI cables, most don't work at all, or are intermittent, the only one I can get anything consistent with seems to be quite a high quality one... It's like the Pi is just putting out a very weak signal :(
by soundsystem83
Sat Apr 26, 2014 5:04 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

Also, sometimes the display will go off for a second and then come back. Setting the hdmi boost to 11 definitely is an improvement on 10, but any higher than 11 and I get no signal at all. I've also noticed that regardless of the settings in config.txt, the TV is always reporting the resolution as 1...
by soundsystem83
Sat Apr 26, 2014 4:35 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

Re: HDMI display issues with TV

Hmm, if I set config_hdmi_boost to 11 the colours are better, but it is still flickery, and the very left of the screen has green flickers. I've checked TP1 and TP2 and the power seems to be fine (almost exactly 5V).

Any ideas?
by soundsystem83
Sat Apr 26, 2014 1:54 pm
Forum: Troubleshooting
Topic: HDMI display issues with TV
Replies: 19
Views: 3525

HDMI display issues with TV

I received a new Raspberry Pi today as part of an OpenElec bundle. When I first connected it to my TV there was no signal through my HDMI switcher so I tried connecting directly to the TV. Still no signal, so I tried several other cables, with results ranging from no signal at all, to intermittent t...
by soundsystem83
Thu Sep 20, 2012 8:53 pm
Forum: Troubleshooting
Topic: SD Card Power Usage
Replies: 1
Views: 485

SD Card Power Usage

Hi, If I power up my Pi with nothing but an SD card plugged in I get only 4.6-4.7V at TP1/2 and a massive 0.25V drop across the main polyfuse F3. If I power up my Pi with nothing, not even an SD card plugged in I get a healthy 5-5.1V at the test points and only 0.03V or so drop across F3. I've tried...
by soundsystem83
Sun Sep 16, 2012 6:02 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Right, so it could still be a power issue? As far as I can tell then, shorting the main polyfuse F3 (or I read somewhere putting a 0.5 to 1 Ohm resistor across it would be better, as without this the Pi will reset if you hotplug/hotunplug any USB devices?) would solve the problems... Or powering fro...
by soundsystem83
Sun Sep 16, 2012 4:23 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Hmm, I think the mouse LED has gone off before. Seems okay now though (although I'm not using it, just waiting for raspbmc to install). So assuming the mouse pointer stops when USB communications break down (which, coincidentally (?) only happens when I click something causing the Pi to attempt to p...
by soundsystem83
Sun Sep 16, 2012 3:34 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

I'm new to this thread, so please bare with me. It appears a) you've got a somewhat low voltage on TP1/2; b) it boots correctly; c) mouse and keyboard are not working correctly; and d) wifi drops out intermittently Having tried several power supplies, and powered the usb devices from a powered hub,...
by soundsystem83
Sun Sep 16, 2012 12:29 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

In addition to the suggestion above, you might try a different Micro USB cable. Some of them have tiny conductors which result in a substantial voltage drop even over a short cable. Unfortunately, it can be hard to tell at ordering time what size conductors a Micro USB cable has. It should help if ...
by soundsystem83
Sun Sep 16, 2012 12:18 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Balls. Got a new 4GB class 4 sd card today, put raspbmc on it, fired up the Pi and I'm still only getting 4.68V at the test points and a 0.3V drop across F3 :( That's with the USB hub, ethernet connection and HDMI connected. When raspbmc finishes installing and I can safely shut it down I'll see if ...
by soundsystem83
Sat Sep 15, 2012 8:17 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Right, I'll get another SD card tomorrow and see how that goes...

Thanks again for your help, I feel like I'm getting somewhere now and instead of just feeling frustrated with the thing I'm learning things now, which is the whole point I suppose!
by soundsystem83
Sat Sep 15, 2012 7:27 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Ah! A new development... If I start the Pi without the SD card and without the USB, I get 5.03V at the test points and only about a 0.06V drop across F3! (It occurs to me now that when I thought I was getting only 4.6V at the test points with the USB hub attached, I also had an HDMI cable attached t...
by soundsystem83
Sat Sep 15, 2012 7:16 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Hmm, voltage drop across F3 is about 0.25V (without anything connected except the SD card). Voltage across TP1 and TP2 without anything connected is about 4.75V, but at one point dropped to about 4.6. Plugging in the USB hub now I'm getting the same voltages. Could've sworn I was getting less before...
by soundsystem83
Sat Sep 15, 2012 6:49 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Ah, okay, I'll try that... If shorting the polyfuse improves things how would I go about making it permanent? is that a good idea? Alternatively would a PSU with more current fix things? I understand that Revision 2 of the Pi leaves out the polyfuses on the USB ports but keeps the main polyfuse (F3)...
by soundsystem83
Sat Sep 15, 2012 6:11 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Hmm, you mean the polyfuse that limits the input current to 1.1A? Why would that make a difference if my PSU is only 1A?
by soundsystem83
Sat Sep 15, 2012 5:57 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

I think I tried it once without any USB devices connected and I was still only getting ~4.6V on the test points... That was with the previous power supplies though, might try it with the new one.
by soundsystem83
Sat Sep 15, 2012 5:55 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Re: Power issues even with 'verified' PSU

Yeah it works, boots up and everything, I can even occasionally get it to play video over the wifi, but the voltage is low across the test points and it's pretty unstable, the mouse pointer stops moving every time I click on anything and it tries to do something, most of the time if I try to access ...
by soundsystem83
Sat Sep 15, 2012 4:10 pm
Forum: Troubleshooting
Topic: Power issues even with 'verified' PSU
Replies: 26
Views: 3494

Power issues even with 'verified' PSU

Hi, I've had my Pi for some time but have yet to find a way of getting more than 4.7V across TP1 and TP2. First I tried my HTC phone charger, then the power supply that The Pi Hut sells, and now one from Maplin that specifically says it has a stable, low-ripple 5V output, and that it can be used wit...

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