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Sapphire graphics useless user manuals
I have a PC with Sapphire HD4980 therein.
When you switch it on, you hear one beep (meaning normal). However, several seconds later, another beep. It seems to be in a reboot loop. Nothing appears on monitor. I open case, and see a red LED flashing on the Sapphire card. There are 3 LEDS just numbered 601, 602, 602. So off to their website to download manual. It is just a generic AMD 4800 series document. Are Sapphire too bloody lazy to create their own? Anyway, after about 15 minutes searching forums, I learn that one LED means overheating, and others mean the extra 6-pin power supplies are not plugged in. They are, so probably power supply is knackered. It tests OK no load, but probably falters feeding the monster. |
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Sapphire graphics useless user manuals
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Sapphire graphics useless user manuals
wrote:
I have a PC with Sapphire HD4980 therein. When you switch it on, you hear one beep (meaning normal). However, several seconds later, another beep. It seems to be in a reboot loop. Nothing appears on monitor. I open case, and see a red LED flashing on the Sapphire card. There are 3 LEDS just numbered 601, 602, 602. So off to their website to download manual. It is just a generic AMD 4800 series document. Are Sapphire too bloody lazy to create their own? Anyway, after about 15 minutes searching forums, I learn that one LED means overheating, and others mean the extra 6-pin power supplies are not plugged in. They are, so probably power supply is knackered. It tests OK no load, but probably falters feeding the monster. VAPOR-X HD 4890 http://www.sapphiretech.com/presenta...n=&lid=1&leg=0 Yes, there are no documents with any technical information. The device is cooled by a vapor chamber, rather than just a heatpipe solution. An article I was reading, suggests a relatively inconvenient vacuum inside the chamber. And that means, if the vacuum ever fails, it would drive up the boiling point of the fluid, and make the chamber much less efficient at distributing heat. Both heatpipes and vapor chambers have to remained sealed for their entire service life. And the vapor chamber has much larger seams and so on. You would also want to keep the fin stack on such a card clean, if it happens to collect a lot of dust. ******* There are two possibilities for the 2x3 cable sensing LEDs. They could be a simple "ground sense" setup, in which case they don't actually detect whether the 12V level is proper or not. You can set up the LEDs, so they just detect the cable is plugged in, and that ground is present on a particular pin. You can also set up the connector, so that the 12V level is sensed, and if out of spec, light up the LED. Which would take a window comparator and a few resistors for a voltage reference for thresholding. But that would costs a few more pennies to include as a feature, and simple "ground sense coming from cable" is the more likely thing driving the LEDs. I guess time will tell, whether it's the PSU at fault or not. If changing the PSU doesn't fix it, then it could be some problem with the video card itself. For failures of this type, you need to switch off power at the back of the computer for at least 30 seconds, then switch on, then push the button on the front again. That's in case any circuits are using foldback limiting. Turning off all power, helps them "forget" the failure for another test run. Waiting 30 seconds is to make sure the +5VSB drains fully. Paul |
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