| Electronics > Projects, Designs, and Technical Stuff |
| really proper way to apply thermal compound? |
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| coppercone2:
maybe bad threads so the operator cant squeeze the part down? did they work right when you tightened them down? did you check to make sure the screw hole was drilled deep enough and the screw was going all th e way in? |
| TERRA Operative:
And was the hole deburred and slightly countersunk? |
| wraper:
--- Quote from: james_s on December 14, 2018, 06:28:36 am ---Look you can speculate all you want, I'm only reporting on what I've found. I've repaired probably 50 of these monitors and most had been worked on multiple times over the years. I found a lot of transistors with thick layers of thermal paste on them that had not squeezed out, this is just plain fact that I saw with my own eyes and scraped off with my own hands. Maybe the paste they used was thicker than the modern stuff, I don't know, the monitors were 20-30 years old when I dealt with them. It's always funny whenever someone tries to tell me something isn't possible when I'm the one that has seen it, do you think I'm lying? --- End quote --- Nobody told you have not seen it. I say you make wrong conclusions. It's quite easy to mount TO-3 not flat even without any thermal paste present at all. And yeah, if it was a monitor, I guess that heatsink was rather small and quality of mounting didn't even really matter. They probably failed due to crap design, not because of bad thermal transfer between transistor and heatsink. |
| coppercone2:
another idea I had is maybe there are some larger clumps of thermal compound that require higher peak pressures to smash (like when you sift flour) and if there is alot of it to begin with you don't mash it well because the pressure is less. |
| wraper:
--- Quote from: coppercone2 on December 14, 2018, 04:28:40 pm ---another idea I had is maybe there are some larger clumps of thermal compound that require higher peak pressures to smash (like when you sift flour) and if there is alot of it to begin with you don't mash it well because the pressure is less. --- End quote --- In such case it's place is in a trash can, not on a heatsink. |
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