Pages: [1]   Go Down
Author Topic: Board fried?  (Read 1020 times)
0 Members and 1 Guest are viewing this topic.
Mumbai, India
Offline Offline
Newbie
*
Karma: 0
Posts: 4
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi,

I got some problem with my arduino UNO board. I am not able to burn my program as well as IC is heating up. Although on board LED connected to pin no 13 is also glowing continuously after plugging power to the board. I am not able to understand whats wrong. Any one faced this problem or can give some suggestion...

Thank you.  
« Last Edit: October 05, 2012, 03:05:51 am by Coding Badly » Logged

Chile
Offline Offline
Edison Member
*
Karma: 32
Posts: 1233
Arduino rocks?
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes, time to replace the atmega
Logged

My website: http://ried.cl

Valencia, Spain
Offline Offline
Faraday Member
**
Karma: 119
Posts: 4589
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi,

I got some problem with my arduino UNO board. I am not able to burn my program as well as IC is heating up. Although on board LED connected to pin no 13 is also glowing continuously after plugging power to the board. I am not able to understand whats wrong. Any one faced this problem or can give some suggestion...


If there's nothing connected to the board then the chip died. Time to replace it.
Logged

No, I don't answer questions sent in private messages...

0
Offline Offline
Shannon Member
****
Karma: 162
Posts: 10489
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

If chip heats up there are several possibilities:

chip plugged in backwards...  check!

chip fried - replace and hope it was only the 328

CMOS latch-up (this will cure itself if you power-cycle the board - caused by driving too high or too low voltages into the input/output pins).
Logged

[ I won't respond to messages, use the forum please ]

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 443
Posts: 23834
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

"chip plugged in backwards...  check!"
I don't believe that actually kills it - here's what gets connected when flipped:
F - flipped port, N - normal port
F    N
b1  c6
b2  d0
b3  d1
b4  d2
b5  d3
avcc  d4
aref  vcc  << aref possibly damaged with 5V applied and no Vcc
Gnd  Gnd << Good!
c0   b6
c1   b7
c2   d5
c3   d6
c4   d7
c5   b0
c6   b1
d0   b2
d1   b3
d2   b4
d3   b5
d4   avcc  << d4 possibly damaged with 5V applied and no Vcc
Gnd  Gnd  << Good!
b6   c0
b7   c1
d5   c2
d6   c3
d7   c4
b0   c5

So 2 pins may possibly be damaged from having 5V being applied while Vcc was not.
If other pins had 5V from external sources applied, those might similarly be damaged.

I've plugged in chips backwards a couple of times, then put a big "1" on my duemilanove (back before I went custom everything)
and neither time did the chip get warm, nor damaged that I could tell. I don't recall doing any special testing for d4, and I wasn't doing any analog at the time, but the chip did whatever else I was doing normally.
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

0
Offline Offline
Shannon Member
****
Karma: 162
Posts: 10489
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Putting 5V on Aref might power the whole chip via its protection diode, and probably trigger latch-up due to the high currents on that diode...
Logged

[ I won't respond to messages, use the forum please ]

Pages: [1]   Go Up
Jump to: