Problem in MSX2 HB-F5 no video signal!

Page 2/2
1 |

Par Dhampird

Hero (589)

Portrait de Dhampird

23-09-2010, 01:28

Hello, all works fine again in the Hb-F5, the problem like Retrotechie saids was the +5V regulator, I had the hb-f5 on over more than half an hour and has no problem. What if I've noticed is that the cooling plate heats up much more if you compared compared with what is hot in the hb-f9s, in HB-F5 cooling plate heats up much more than the HB-F9s, i also placed the rubber isolation in both cases, will the +5V regulator needs to add thermal paste, also? I only have here Artic Silver 5, i think that this +5V regulator and other components could use a colling paste, in another hardware i could see some kind of cooling white paste. Any specific type to put on it? not needed?
Well, thanks a lot again Alwin for the usefull help.

Par flyguille

Prophet (3031)

Portrait de flyguille

23-09-2010, 01:42

the thermal paste, is not a "cooling paste".

the thermal paste just allow the temp to go foward with a minimun resistence in the transmission

it is used to connect the dissipators to the component that generates the heat.

but, there is a secret, the thermal paste is used only to match both surfaces to the perfection, to connect both surfaces (filling any irregularity that in other way will be little spots of air).

But the thermal paste has no cooling properties.

so, if you put more paste, the heat will travel more paste, and the paste is not 0% thermal resistence.

when more paste, less effective it is.

you needs to put just a little very slim ammount paste, and firmly screws up both parts.

Par RetroTechie

Paragon (1563)

Portrait de RetroTechie

23-09-2010, 03:05

The rubber sheet used, probably means that regulator & cooling plate shouldn't be electrically connected. So you won't get metal->paste->metal contact anyway. That rubber isolation sheet will be the biggest thermal resistance (apart from cooling plate -> surrounding air), so if used there's little point in adding cooling paste. Btw: paste serves to replace air voids with something that conducts heat better than air - in this case such voids might be filled with rubber.

I wouldn't worry too much about it: cooling plate inside closed MSX means the heat-flow can't be very big, therefore temperature difference between cooling plate and regulator won't be that big anyway. And voltage regulators are built to take a beating. It worked fine before, right? (as long as cooling plate is present) ... EvilWink

Page 2/2
1 |