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<sjoerd>
Hey guys, just started playing with rock. unfortunately it doesn't seem to be coming up :/
<sjoerd>
nor does it seem to appear on usb when holding the recovery button
<sjoerd>
any suggestions for troubleshooting that
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<AstralixNB>
sjoerd, still there?
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<sjoerd>
AstralixNB: yup
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<AstralixNB>
sjoerd, did you get your board going?
<AstralixNB>
if not, what did you try till yet?
<sjoerd>
AstralixNB: few differnt 5V power supplies, hooked up serial cable, tried different serial cable just to be sure.. tried a few different usb cables just to be sure
<sjoerd>
no luck in all cases
<sjoerd>
nothing on serial, using the usb otg line shows nothing on usb on the computer (whether that's just power over usb or powering via a 5v supply as well)
<AstralixNB>
first of all, rock1 or rock2?
<sjoerd>
1
<AstralixNB>
ok, so it must come up with jjust OTG connected, even if you use a very cheap high resistance cable
<sjoerd>
well it doesn't :)
<AstralixNB>
just sorting things out
<AstralixNB>
You have a low-voltage serial adapter? cause older rock1 will be destroyed by 5V serial port adapters
<sjoerd>
yeah 3.3v
<AstralixNB>
cool, you double checked TX/RX twice?
<AstralixNB>
cause I have some adapters labeled in host view, some in modem view (RX/TX exchanged)
<sjoerd>
2014 06 10 on the board fwiw
<sjoerd>
Yeah switched them arounda few times
<AstralixNB>
Did you ever see any serial character coming out of the rock1?
<sjoerd>
Also double-checked with a differnt arm board to make sure what i think is RX on the serial is indeed RX :)
<sjoerd>
nope never anything out of the serial
<AstralixNB>
cool , so you have one working rock1 and one that doesn't?
<sjoerd>
No i've got a load of working arm boards and one non-working rock1
<AstralixNB>
Ok, your table looks like mine :)
<AstralixNB>
So I can ssume you're familiar with electronics, reading schematics and such?
<sjoerd>
Yeah
<AstralixNB>
That will make it much easier
<sjoerd>
Tbh unless you have some cunning tricks, we already declared the board dead and anothe one is one the way :)
<sjoerd>
still a shame to throw away things though
<AstralixNB>
I am not sure we could complete the journey today, but if you like we could do a little ride through traces on the PCB :)
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<sjoerd>
AstralixNB: good to know 5v serials can destroy older rock1 (what's older) though, I'll make very sure i don't mix up cables for these boatrds then :p
<sjoerd>
AstralixNB: If you hae some points for me to measure easily then sure
<sjoerd>
AstralixNB: But i don't really want to waste your time (or too much more of mine) on it tbh
<AstralixNB>
If you talk of ARM Cortex-A you should consider all ports to be 1.2V up to 3.3V. With modern ARM Cortex-M many have now 5V tolerant ports
<sjoerd>
Yeah, i think i just have one 5v cable lying around somewhere
<sjoerd>
as most boards are indeed 1.8 or 3.3v
<AstralixNB>
The most magic with the incoming 5V is done around U1, the PMIC, so if you have some fine tips on the meter or scope, you could check around there easy
<sjoerd>
don'e have a scope here unfortunately
<AstralixNB>
I use some 1.2V adapters that are 5V stable. It even works at 0.8V
<AstralixNB>
Multimeter should be fine
<AstralixNB>
You don't have to do it right now, but I am in here very often. If not, you can trigger mmind00 to leave me a note.
<AstralixNB>
If you download the schematics of the board and just do some rough tests on the components mentioned on page 3 of the schematics, you probably find the problem very easy
<AstralixNB>
Fuse F1, power switching FET Q1 and the VSYS traces are all pretty big in size and can be touched and measured
<AstralixNB>
I would prefer to use a lab supply with current limited to 500mA so you won't blow anything or extend the failure if there is one
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<AstralixNB>
I guess you're pretty busy measuring around? I've to go now, not sure if I am back today as my bip server is offline.