stolzie
New Member
Hi Guys,
I am after some advice and suggestions of what can be done. Here is the story:
We currently have a circuit that has been in production for a number of years now, and are having issues with both older and newer units failing at different temperature ranges(mainly the hotter side). I wouldn't have been too concerned if it was a particular batch, that had failed but different units across a number of different production runs is a bit worrying.
There are a number of different IC's (5 in total) in this circuit which populate an area 72mm (~3") x 72mm , there are two that are rated between 0-70C, one that is -40 to 85C and the rest -40 to 125C. Along with two crystals for two of the IC's.
The suspect units are failing from about 37C to 60C, but the majority are at 50C.
In order to test our boards we are heating the operating board with a heat gun at certain ranges to maintain a constant temperature over the board as we can't afford an oven for testing. The temperature is being measured by a probe that has come with the multimeter and is directly placed over a particular IC while heating.
However seeing as all IC's are close together, we are not sure how to work out which chip/ crystal is failing. We have hit a few with freeze spray and the board has come back but in the process I believe we have also cooled down the other chips. We are lead to believe it is a certain chip but not 100% sure.
We have thought about boxing the IC's to heat particular sections of the board to work it out.
Anybody able to share there experiences with this kind of failure and how you managed to track the problem?
Thanks in advance for your input.
Cheers
Stolzie
I am after some advice and suggestions of what can be done. Here is the story:
We currently have a circuit that has been in production for a number of years now, and are having issues with both older and newer units failing at different temperature ranges(mainly the hotter side). I wouldn't have been too concerned if it was a particular batch, that had failed but different units across a number of different production runs is a bit worrying.
There are a number of different IC's (5 in total) in this circuit which populate an area 72mm (~3") x 72mm , there are two that are rated between 0-70C, one that is -40 to 85C and the rest -40 to 125C. Along with two crystals for two of the IC's.
The suspect units are failing from about 37C to 60C, but the majority are at 50C.
In order to test our boards we are heating the operating board with a heat gun at certain ranges to maintain a constant temperature over the board as we can't afford an oven for testing. The temperature is being measured by a probe that has come with the multimeter and is directly placed over a particular IC while heating.
However seeing as all IC's are close together, we are not sure how to work out which chip/ crystal is failing. We have hit a few with freeze spray and the board has come back but in the process I believe we have also cooled down the other chips. We are lead to believe it is a certain chip but not 100% sure.
We have thought about boxing the IC's to heat particular sections of the board to work it out.
Anybody able to share there experiences with this kind of failure and how you managed to track the problem?
Thanks in advance for your input.
Cheers
Stolzie