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 ....
......." .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....
'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 ?
Spoiler :
.....
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 ...
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 ....
......." .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....
'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 ?
Spoiler :
.....
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 ...
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