I killed it.
Areal Person
Posts: 197
I was wiring my version of a demo board, I was working with the TV video.
I by accedent ran one of the TV driver programs (may not have mattered anyway)
then, all the sudden I could not find the prop chip.
Is that possiable, All I had hooked up was the TV video through my homemade
3 resistor DAC. It is a portable TV running at 12vdc.
Could I have got feedback ? that blew up my chip or what ?
Thanks,
-Areal
·
I by accedent ran one of the TV driver programs (may not have mattered anyway)
then, all the sudden I could not find the prop chip.
Is that possiable, All I had hooked up was the TV video through my homemade
3 resistor DAC. It is a portable TV running at 12vdc.
Could I have got feedback ? that blew up my chip or what ?
Thanks,
-Areal
·
Comments
using the manuals setup diagram with propeller plug. (no eeprom)
pins p12,p13 & p14 (1.1k, 560, 270)
I grounded the jack on the board to the 3.3v ground
I pluged the RCA cable in turned the TV on
Found the prop with F7, and started running
some on the TV demo programs.
All the sudden, I got "No propeller found on COM1 etc.."
And I have not been able to find it as of yet, I removed the chip
from·the dip socket on my setup and put it on my breadboard according to the
manual setup found in the manual.
no luck. I'm not even close to being advanced with electronics,
I'm a beginner, I however do program in C and I understand computers.
Is it possiable for current to flow
from the RCA plug into the Prop and overload
kinda like blowing it out from the butt end ? (electrical implosion ?)
The TV used 12vdc, but the powersource was well away from the
solid 3.3 volt regulator I use for the prop (it's really a nice one)
It was the software locking up the chip, or I got some kind
of feed back.
I had just tested the setup with flashing LED's just fine.
What do you think Mike ?
Could I have damaged my propeller plug also ?
Thanks,
-Areal
·
Check your wiring. Check your voltages with a meter.
There's nothing that would feedback or lockup that would damage the chip and any software lockup would stop on the next reset.
I'll recheck everything, I'll try to be more
carefull. I don't know what I could have done.
But if you say it's not possiable, then ...
Well, I must have done something I dont know about.
Thank's for the help.
I'm trying to build some of this stuff... Sometimes I'm over
my own head [noparse]:([/noparse]
Expert help like what you give, and what others give on the
forum makes it possiable for folks like me to do some of this
cool stuff. It's apprechated.
-Areal
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Paul Baker
Propeller Applications Engineer
Parallax, Inc.
Enough said on the topic be sure to follow proper ESD practices while making connections. All of us that have been doing electronics for a while can vouch for the results if you don't.
With the positive probe to VSS the port pins read around 420mv. With the ground probe to VDD the port pins read 630mv. The exact reading doesn't matter too much but you should find them in this general range however all the port pins should read much the same, any significant difference probably indicates a breakdown of the substrate.
This method works well with ICs in general and is a standard test I perform when I suspect such a failure.
*Peter*
I'm going to check all my stuff, when I get back to work.
-Thanks
I suggest you take a clean breadboard and start everything over... Double-check all cables.
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Paul Baker
Propeller Applications Engineer
Parallax, Inc.
Who hasn't burnt the midnight oil tracking down a fault only to find it was something really really simple, dumb, and of course it should've been obvious. Now talking about obvious has areal checked that the power supply is functioning correctly???
*Peter*