stardustsailor
Well-Known Member
Chip #3 :
Something was wrong ..
At least -if the sensors are working alright-something was going wrong with that chip ....
Almost immediately ,at 2A ,started to show a big Tc difference with the rest ....
It reached to ΔΤ levels of +10°C !!!!
So...
An diagnostic ' autopsy '...
.....had to be done ....
![P5141331.JPG](/data/attachments/2251/2251914-b4df32d477e2cd0a548d2e7c871cbfc4.jpg)
....
..." .I think I thaw a void..."
Yeap.A void.Also the array holder shows a slight "back'n' forth ' movement ,like it is bended ...
It will be replaced....Anyway...Arctic Silver was applied to the void ....
And after ~15 min at max Fan / Chip operation ,temps started to stabilise....
![P5141334.JPG](/data/attachments/2251/2251916-9388aaf84b54889973d51c6abb533de0.jpg)
'Problem' gone ....
(Though I've to remove some excess TIM from chips #1 & #3 ...
I've probably 'overdone' it with TIM quantity/thickness ,at those two chips ....)
Now .....
About cooling ....
Check those case temps above ...
Average :~ 42°C..
Ok ?
Ambient temperature was exactly 25°C ...
Ok ?
How hot do you think it is 2" away from a CXA3070 ,driven at 2A ?
![P5141337.JPG](/data/attachments/2251/2251918-5ca340f026baec560e87d86ed2ecabb9.jpg)
![P5141338.JPG](/data/attachments/2251/2251919-f1c60d9d02a68f1b62bee976655088d0.jpg)
![Shocked :shock: :shock:](/styles/smilies/icon_eek.gif)
![Shocked :shock: :shock:](/styles/smilies/icon_eek.gif)
![Shocked :shock: :shock:](/styles/smilies/icon_eek.gif)
Spoiler :
![P5141336.JPG](/data/attachments/2251/2251917-e92fd03119cba4d525a35ecfdae6c3c9.jpg)
.....
Fixture has rather noisy ,but top-notch HSF cooling ....
At 2A drive current ,Tc of CXAs remains below 50°C,at Ta=25C....
Which is .....
A rather great cooling accomplishment ...
![Big Joint :bigjoint: :bigjoint:](/styles/smilies/smoking.gif)
![Big Joint :bigjoint: :bigjoint:](/styles/smilies/smoking.gif)
![Big Joint :bigjoint: :bigjoint:](/styles/smilies/smoking.gif)
Something was wrong ..
At least -if the sensors are working alright-something was going wrong with that chip ....
Almost immediately ,at 2A ,started to show a big Tc difference with the rest ....
It reached to ΔΤ levels of +10°C !!!!
So...
An diagnostic ' autopsy '...
![Rolling Eyes :roll: :roll:](/styles/smilies/icon_rolleyes.gif)
![P5141331.JPG](/data/attachments/2251/2251914-b4df32d477e2cd0a548d2e7c871cbfc4.jpg)
....
![Shocked :shock: :shock:](/styles/smilies/icon_eek.gif)
![P5141332.JPG](/data/attachments/2251/2251915-eda72e7912e153384a05dd7b1d9bfbaa.jpg)
It will be replaced....Anyway...Arctic Silver was applied to the void ....
And after ~15 min at max Fan / Chip operation ,temps started to stabilise....
![P5141334.JPG](/data/attachments/2251/2251916-9388aaf84b54889973d51c6abb533de0.jpg)
'Problem' gone ....
(Though I've to remove some excess TIM from chips #1 & #3 ...
I've probably 'overdone' it with TIM quantity/thickness ,at those two chips ....)
Now .....
About cooling ....
Check those case temps above ...
Average :~ 42°C..
Ok ?
Ambient temperature was exactly 25°C ...
Ok ?
How hot do you think it is 2" away from a CXA3070 ,driven at 2A ?
![P5141337.JPG](/data/attachments/2251/2251918-5ca340f026baec560e87d86ed2ecabb9.jpg)
![P5141338.JPG](/data/attachments/2251/2251919-f1c60d9d02a68f1b62bee976655088d0.jpg)
![Shocked :shock: :shock:](/styles/smilies/icon_eek.gif)
![Shocked :shock: :shock:](/styles/smilies/icon_eek.gif)
![Shocked :shock: :shock:](/styles/smilies/icon_eek.gif)
Spoiler :
![P5141336.JPG](/data/attachments/2251/2251917-e92fd03119cba4d525a35ecfdae6c3c9.jpg)
.....
Fixture has rather noisy ,but top-notch HSF cooling ....
At 2A drive current ,Tc of CXAs remains below 50°C,at Ta=25C....
Which is .....
A rather great cooling accomplishment ...
![Big Joint :bigjoint: :bigjoint:](/styles/smilies/smoking.gif)
![Big Joint :bigjoint: :bigjoint:](/styles/smilies/smoking.gif)
![Big Joint :bigjoint: :bigjoint:](/styles/smilies/smoking.gif)
Last edited: