Regarding LM317: Not getting required output

[sachin25feb]

Dear All,
I am working on failure analysis of products.
In one faulty module we use LM317 for 5.17 V generation.
The reported problem is that the output voltage is not observed and sometimes it is observed (During vibration)
After analysis it is observed output pin of LM317 is not soldered so sometimes it is get connected and sometimes it is not.
But problem is that when output pin is firm with soldering pad that time at the output voltage observed 10.48V instead of 5.17V.
When output not observed that time output voltage is occurred 0.25V.

When I soldered output pin then everything is working fine and observed 5.17 v exact.

Now i want to know why this happen in that instance I got sometime 10.48 V and sometime 0.25V.

I attached herewith snap of circuit.
Please help me friends it is very interesting problem.
your suggestions and comments regarding this problem is must.

 

[barry]

Boy, that wins the award for most confusing post ever.

First you say, "when output pin is firm.. output voltage observed 10.48V". Then you say "When I soldered output pin then everything is working fine and observed 5.17 v exact." So, which is it?