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 On Sun, Dec 22, 2013 at 7:24 PM, <[email protected]> wrote: > Can be a hardware issue. Boards (at least some revisions) have small > design "feature" that will make them unusable with some HDMI adapters. > I have A6 revision and a Delock > 63457<http://www.delock.com/produkte/G_65347/merkmale.html?setLanguage=en>HDMI > adapter. > > Now the HDMI adapter gets it's power from HDMI connector (+5V) through a > resettable fuse PTC (noted RT1 on schematic, the yellow component near USB > host connector). This excellent feature will protect PM (the > *TPS65217*<http://www.ti.com/product/tps65217c>) > against cheap chinese adapters or enthusiasts bad behavior through HDMI > interface. The problem is the fuse which is under-estimated, on my board a > 100mA PTC is mounted. > > Since *TPS65217* <http://www.ti.com/product/tps65217c> can handle a lot > bigger, just replace the fuse with a 250mA one and you'll be ok. Better, > remove the PTC and power the HDMI directlly through +5V main supply since > there is the same +5V regulated and the kernel will anyhow put the device > in standby if too long inactivity on keyboard or mouse will be detected. > > As a rule of thumb... if the PTC gets hot, the HDMI adapter tries to draw > more power that fuse can handle. The voltage will drop under 5V and HDMI > adapter will goes grazy... you will have a short image at boot time, then > nothing. The board doesn't allow me to upload some pictures about issue. > > 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/groups/opt_out.
