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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Jun 18th, 2019, 07:30 | #21 |
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Did you have adhesion issues with the double sided tape with first heat sink? Why did you change up the heat sink?
Last edited by shoebox; Jun 18th, 2019 at 07:37. |
Jun 18th, 2019, 15:16 | #22 |
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The first heatsink had double sided tape but I think I bought them at least a decade before using it in the Volvo... So adhesion was lousy.
The unit is always under power, at least part of it, and when malfunctioning, e.g. the central locking doesn't work: clearly something that is always ON waiting for a radio frequency signal from your key. So my first solution was to add a heatsink to something that always produces some heat and that malfunctions when surrounding air gets too hot. But I still left the metal shielding-box around the processor in place. So the heat-CAPACITY of the processor slightly increased and through the heatsink touching the metal-shielding-box, there will also have been a *slight* increase in heatexchange with the environment, but it was still basically a electrical heater in a tiny room: think sauna... So what I did now is open the door to the sauna and even cut out a part of the sauna wall And I even put a fan sucking air past the 'saunaheater'. So the sauna is no longer a sauna. And I think there was also some debate as to which IC (processor? memory? 2nd processor?) caused the heat. The first heatsink only covered the biggest processor, the new one is attached (with copper shims*) to two or three IC's. I was a little worried when I just got into the car an hour ago (>>25ēC outside), but there were no issues. (Again, knock on wood...) * copper has even better heatconduction than aluminium, but it is way too pricey and heavy to use in heatsinks (bar some rediculously priced amplifiers)
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Ex police Jan '04 V70 D5 AWD geartronic, and I've got the antenna-holes to prove it. Last edited by R-P; Jun 18th, 2019 at 15:22. |
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Jun 21st, 2019, 18:39 | #23 |
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Please how were you able to cut out part of the wall or housing?
Is this what you are talking about the slits at bottom of housing: https://i.imgur.com/naTIM9C.jpg |
Jun 22nd, 2019, 23:15 | #24 |
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First try:
After this failed, I left off this lid. The slits under the metal (below pick) make sure it can actually suck air past the heatsink. Any airflow is better than no airflow, and with the slits, it may actually have a pretty decent airflow from the sides sucking it straight out into the footwell. Far from perfect, but the best I could to before drilling and filing into metal just millimeters from a failing PCB...
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Ex police Jan '04 V70 D5 AWD geartronic, and I've got the antenna-holes to prove it. Last edited by R-P; Jun 22nd, 2019 at 23:19. |
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Jun 23rd, 2019, 05:06 | #25 |
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What kind of drill did you use? You did a clean job with slits. This might be beyond my ability, worried i might damage something
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Jun 25th, 2019, 15:39 | #26 |
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The slits are there from the factory but do very, VERY little for airflow when the lid is in place. No way I could have made them myself so close to the PCB
Maybe I should have said "short of drilling and filing into..." instead of "before". You might read the "before" as if I had actually done drilling and filing, but I didn't. As I doubt that would have had a positive outcome. The PCB is laquered, probably as a quite effective way of protecting it against moisture (the somewhat orange glow over all components in above pic (and not "pick"..., how can I make mistakes like that?????)). But soldering is now impossible unless you can *somehow* get the laquer off. So e.g. soldering the metal shielding-box from the PCB to make slots to improve airflow and then solder it back is nigh on imposssible for my (reasonably advanced) sodering skills.
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Ex police Jan '04 V70 D5 AWD geartronic, and I've got the antenna-holes to prove it. Last edited by R-P; Jun 25th, 2019 at 15:47. |
Jun 27th, 2019, 10:34 | #27 | |
Bob865349
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Quote:
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Jun 27th, 2019, 20:04 | #28 |
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Thanks. OK that makes things more doable. I basically have two option, and a possible tweak to second option:
1. Your way which seems to be working with for you 2. Essentially same method but point of difference is using self-stick heatsinks 2A. Wiggle the metal box surrounding chips off (metal shield will be off regardless of doing this). messaged somebody on another forum who did this. I'm not sure if they got lucky doing this without consequence. Wonder your opinion regarding this. I feel with my present ability self stick heatsink might be low risk option for me without screwing things up. If not effective you think I would have issues removing heatsink? I hope Im able to get adhesive tape off. Last edited by shoebox; Jun 27th, 2019 at 20:08. |
Jul 1st, 2019, 19:03 | #29 |
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Please how did you attach the fan to the case?
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Jul 1st, 2019, 22:48 | #30 |
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Have a look here. It should have all pics.
You can see there's a slide-out part (think "drawer") which features the PCB that needs the heatsink. There's a metal cover over the heatsink that I left off. And there's a black plastic cover that I also left off. They all impede airflow. The fan is mounted on the part that holds the slide-out part (think 'cabinet' that holds the 'drawer'). The mountingholes from the fan align with the holes in the cover (= part of the 'cabinet') over the 'drawer'. So with some slight filing, I could position the fan directly over the heatsink (once the 'drawer' is in place.) Connecting them was with these bolts. (Probably M4, possibly M3). The maximum diameter of the head is just slightly bigger than the holes in the cover (part of the 'cabinet') so they sit almost flush. I don't think I tapped any threads into the fan-mounting-holes, but I might have, since it is increadably easy since I got a set of these: Screwing the bolts in place has to be done BEFORE the 'drawer' is in place, as the screwdriver is inserted through holes on the bottom of the 'cabinet'. So that was a fiddly job. EDIT: just found some older pics about filing down the fan to make it fit and the screwdriver entering through the bottom of the 'cabinet'. And I added them to the link above.
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Ex police Jan '04 V70 D5 AWD geartronic, and I've got the antenna-holes to prove it. Last edited by R-P; Jul 1st, 2019 at 23:33. |
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