Yes I know. It is the way I designed the board. I do not see it as an issue. It is designed to limit the current. You are free to change it if you like as long as you don't expect any RMA support on the board.
Gerald On Wed, Mar 12, 2014 at 1:58 AM, suteerth tripathi < [email protected]> wrote: > Hello Gerald, > Thank you for your reply. The power supplied through the PTC turned out to > be the issue. On my HDMI to VGA converter, I removed the power coming from > beaglebone microHDMI port and added external power supply and it is working > fine. > Earlier, even when I forced resolution, after 5 or 10 mins the PTC would > become too hot and the monitor would go to to sleep, now It runs properly > for a few hours. > > Suteerth > > > On Friday, 28 February 2014 23:20:57 UTC+5:30, Gerald wrote: > >> External power will work, as that is the one we recommend. The yellow >> thing is a PTC, not a fuse. It is designed to get hot and as a result >> increase the resistance with the level of heat to reduce the current flow. >> >> Gerald >> >> >> >> On Fri, Feb 28, 2014 at 11:46 AM, <[email protected]> wrote: >> >>> Instead of changing the fuse and (probably) violating the warranty on >>> the BeagleBone black, if I hack my microHDMI to VGA adapter and give it >>> external power, would it work ? >>> Interestingly, the yellow thing does get incredibly hot and I see >>> nothing past the beaglebone flash screen while boot, that too only after I >>> edited the uEnv.txt file. >>> however the edid info obtained by logging into beaglebone through SSH >>> (putty) shows 1 available resolution 1440x900@60Hz >>> with a different HDMI to VGA adapter 2 options are available 1920x1080 @ >>> 60Hz and another one 1600 something by something. would that be issue of >>> power supply to the HDMI to VGA converter or something else ? >>> >>> thanks in advance >>> >>> >>> On Monday, 23 December 2013 15:25:31 UTC+5:30, [email protected] wrote: >>>> >>>> >>>>> Feel free to do this modification. Just remember it violates the >>>>> warranty. I do not intend to power the world over HDMI connector. Just the >>>>> EEPROM for the purpose of reading the EDID. This is the way the board was >>>>> design and is not a "feature". >>>>> >>>>> While the TPS65217 can handle more, it does have a limit. >>>>> >>>>> Gerald >>>>> >>>> >>>> Hi Gerald, >>>> >>>> Agree :) But at least consider a bigger fuse, a 250mA would be perfect. >>>> Those PTCs are not very good when current is near maximum point. They not >>>> actually switch, but increase their resistance due to natural construction >>>> and revert very slowly to initial condition (minutes). BTW this one has 4.5 >>>> ohms in normal state so when a big HDMI consumer will draw there will be no >>>> more +5V anyhow. >>>> >>>> My reason is quite simple... I spent around 45 euro for board with all >>>> taxes and another 20 or more for cheapest HDMI adapter I found. So almost >>>> 50% from price and I see no point to spent more for a better adapter. >>>> >>>> Regards, >>>> Edouard Gora, YO3HCV >>>> >>>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
