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<blockquote data-quote="HTPCSourcer" data-source="post: 1145011" data-attributes="member: 74879"><p><strong>MediaPortal installation and practical test - Thermal design</strong></p><p></p><p>MediaPortal 1.12 installs smoothly on the system. Use LAV codecs instead of Microsoft-DTV as the latter is not running well on the Justop.</p><p>Video replay and TV work as expected, both for 720p/1080p as well as the more demanding 1080i sources. 4k will not play.</p><p></p><p>However, after some time of playing I realized that the picture was becoming choppy, particularly on 1080i, which suddenly was playing at 30 fps only instead of the expected 50 fps.</p><p></p><p>[ATTACH]167258[/ATTACH]</p><p></p><p>After some search and hints from the forum, the reason turned out to be related to the bad thermal design of the Justop. In fact CPU/GPU is quickly heating up and the CPU speed is throttled down to a constant 500 MHz in the case of 1080i.</p><p></p><p>Taking the case apart reveals the little hardware inside:</p><p></p><p>[ATTACH]167259[/ATTACH]</p><p></p><p>It can be seen that the system is really completely passive - there is not even a visible heatsink. Actually the system is using the bottom of the case as heatsink, which when playing video is getting really hot. The thermal design of the system is not well thought-out:</p><ul> <li data-xf-list-type="ul">There are venting openings at the bottom of the case, but it comes without spacers. When used the openings will be blocked.</li> <li data-xf-list-type="ul">There are no venting openings on the top of the case.</li> <li data-xf-list-type="ul">The removable top part of the case, which is painted black, has practically no thermal connection with the bottom. While the latter gets hot, the top stays cold.</li> </ul><p>In order to test the cooling hypothesis I took the heatsink of an old graphics card that was still lying around and just placed it on the bottom of the Justop (case upside down). No thermal paste or anything applied.</p><p></p><p>[ATTACH]167262[/ATTACH]</p><p></p><p>Then I put a 720p TV station on, which presents little load for the GPU. The heatsink immediately started to get warm. After 45 min the fps was still at 50.</p><p>After that I switched to a 1080i station. The fps quickly dropped to 30-40 fps, but pressing the heatsink to the surface of the case brought it back to 50 fps.</p><p></p><p>This lets me believe that a correct mounting of the heatsínk by using heatsink glue will solve the issue without having to completely unmount and rebuild the device. Screwing the heatsink to the case would obviously be better, but drilling holes into it with the electronics still in it, is probably not a good idea. I am also thinking of adding a small heatsink on the big metal cover on the board (see picture of the open case) and also drill a series of venting holes into the top of the case cover. There would even be enough space left inside the case to add a small fan.</p><p></p><p>I will update this thread once I have found a permanent solution</p></blockquote><p></p>
[QUOTE="HTPCSourcer, post: 1145011, member: 74879"] [B]MediaPortal installation and practical test - Thermal design[/B] MediaPortal 1.12 installs smoothly on the system. Use LAV codecs instead of Microsoft-DTV as the latter is not running well on the Justop. Video replay and TV work as expected, both for 720p/1080p as well as the more demanding 1080i sources. 4k will not play. However, after some time of playing I realized that the picture was becoming choppy, particularly on 1080i, which suddenly was playing at 30 fps only instead of the expected 50 fps. [ATTACH]167258[/ATTACH] After some search and hints from the forum, the reason turned out to be related to the bad thermal design of the Justop. In fact CPU/GPU is quickly heating up and the CPU speed is throttled down to a constant 500 MHz in the case of 1080i. Taking the case apart reveals the little hardware inside: [ATTACH]167259[/ATTACH] It can be seen that the system is really completely passive - there is not even a visible heatsink. Actually the system is using the bottom of the case as heatsink, which when playing video is getting really hot. The thermal design of the system is not well thought-out: [LIST] [*]There are venting openings at the bottom of the case, but it comes without spacers. When used the openings will be blocked. [*]There are no venting openings on the top of the case. [*]The removable top part of the case, which is painted black, has practically no thermal connection with the bottom. While the latter gets hot, the top stays cold. [/LIST] In order to test the cooling hypothesis I took the heatsink of an old graphics card that was still lying around and just placed it on the bottom of the Justop (case upside down). No thermal paste or anything applied. [ATTACH]167262[/ATTACH] Then I put a 720p TV station on, which presents little load for the GPU. The heatsink immediately started to get warm. After 45 min the fps was still at 50. After that I switched to a 1080i station. The fps quickly dropped to 30-40 fps, but pressing the heatsink to the surface of the case brought it back to 50 fps. This lets me believe that a correct mounting of the heatsínk by using heatsink glue will solve the issue without having to completely unmount and rebuild the device. Screwing the heatsink to the case would obviously be better, but drilling holes into it with the electronics still in it, is probably not a good idea. I am also thinking of adding a small heatsink on the big metal cover on the board (see picture of the open case) and also drill a series of venting holes into the top of the case cover. There would even be enough space left inside the case to add a small fan. I will update this thread once I have found a permanent solution [/QUOTE]
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