|
Has any one experienced partial short circuits apearing between adjacent pins on ADSP21061,2 devices. These shorts are around a few tens of ohms. On removing the faulty device from the pcb the fault disapears-probably due to heating the device |
|
|
Re: 21061 and 21062 sharc pin shorts
Started by ●March 6, 2002
Reply by ●March 7, 20022002-03-07
|
At 05:53 PM 6/03/2002 +0000, jstadius wrote: >Has any one experienced partial short circuits apearing between >adjacent pins on ADSP21061,2 devices. These shorts are around a few >tens of ohms. On removing the faulty device from the pcb the fault >disapears-probably due to heating the device > Not exactly, but I have a 21061 board that, after I've downloaded a program, locks up (will not work) UNTIL I WAVE MY HAND OVER IT!! While this is very gratifying, and confirms all those things my parents said about their TV's with faults working perfectly when I watched them, it is a bit weird. Obviously there is some strange capacitance thing going on. Adrian. -- Dr A.P. Whichello Phone: +61 2 6201 2431 Electronics & Telecommunications Engineering Fax: +61 2 6201 5041 University of Canberra Email: Australia WWW: http://www.ee.usyd.edu.au/~adrianw "I wish to God these calculations had been executed by Steam!" C.Babbage |
Reply by ●March 8, 20022002-03-08
|
At 08:32 AM 3/8/2002 +1100, Dr A.P. Whichello wrote: >At 05:53 PM 6/03/2002 +0000, jstadius wrote: > >Has any one experienced partial short circuits apearing between > >adjacent pins on ADSP21061,2 devices. These shorts are around a few > >tens of ohms. On removing the faulty device from the pcb the fault > >disapears-probably due to heating the device > > > >Not exactly, but I have a 21061 board that, after I've downloaded a >program, locks up (will not work) UNTIL I WAVE MY HAND OVER IT!! While this >is very gratifying, and confirms all those things my parents said about >their TV's with faults working perfectly when I watched them, it is a bit >weird. Obviously there is some strange capacitance thing going on. > >Adrian. >-- >Dr A.P. Whichello Phone: +61 2 6201 2431 >Electronics & Telecommunications Engineering Fax: +61 2 6201 5041 >University of Canberra Email: >Australia WWW: http://www.ee.usyd.edu.au/~adrianw This sounds like you might have an open connection where a pullup is connected. You might try pushing gently on the pins of the DSP with a fine tipped probe |
