Film-Tech Forum ARCHIVE: Input FPGA temp warning

This is topic Input FPGA temp warning in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by Michael Robinson (Member # 10329) on 06-17-2019, 10:10 PM:

Can anyone shed light on this warming I received the other night on a CP2308?

Posted by Marco Giustini (Member # 4544) on 06-18-2019, 02:59 AM:

I’m not familiar with your machine but it’s a chip on a board. Make sure your filters are clean or replace them and check that the booth’s temperature is ok.

Posted by Mark Gulbrandsen (Member # 72) on 06-18-2019, 08:16 AM:

Some Christies have an internal laminar air flow filter that blows filterd air across the face of the DMD's, and that also has to be changed. IDK if yours has it or not.

Mark

Posted by Dave Macaulay (Member # 813) on 06-18-2019, 11:44 AM:

I don't think there are FPGA chips on the formatter boards, all TI custom ones. Couls be wrong of course. There is aone on the ICP but that would get a different error. Barco has one called "FMT FPGA" and probably Christie does as well, it would most likely be on the PIB... so the card cage fans and/or air filters are suspect. If those are OK maybe the chip heatsink or thermal compound is defective?
The LAD fan ais supposed to blow dust off the imager chips, I don't know if they contribute any cooling but it would only be on the DMD chips and not the rest of the light engine board. It's a tiny fan sucking through a filter then blowing into three small tubes, so the outlet airflow is very low.

Posted by Mark Gulbrandsen (Member # 72) on 06-18-2019, 11:52 AM:

On NEC projectors there is an FPGA cooling fan located on the top (CPU Module) that blows filtered air coming in down on the FPGA chip on the ICP below it. Some how Christie is going to have to cool that chip too. Probably in a similar way. That chip runs extremely hot.

Mark

Posted by Marcel Birgelen (Member # 6801) on 06-18-2019, 11:58 AM:

The ICP should be largely the same across the different brands and I think there are two FPGAs on there. I think there is one on the Christie formatter board as well, but I'm not entirely sure. Those boards are all pretty limited in production, that's why you'll see FPGAs way more often than on some consumer hardware, which would probably use custom-built ASICs instead.

But for this cooling issue, I'd check the airflow to the cards and I'd also try to remove the dust from them by blowing some compressed air over them.

Loose heat sockets also often cause individual ICs to overheat, you'd check for those too.

Posted by Daniel Morez (Member # 5787) on 07-02-2019, 10:01 AM:

Do you have a way to see what that Input FPGA temperature is? If its simply elevated and over a nominal range its probably restricted cooling as others have mentioned. If its an extreme unrealistic high level or intermittently quick swinging between nominal and max it could be a temp sensor or temp monitor chip error.

What is the color of the "INPUT" status LED on the main I/O module? To me INPUT says its related to input video processing. If its other than green perhaps the temp error is related to the chip on that main I/O board (Not sure what that combo board on those units is called).

Posted by Michael Robinson (Member # 10329) on 07-06-2019, 10:20 AM:

Looks like it was an issue with our ventilation not properly functioning. After normalizing ambient room temp, projector has returned to a state of peace.

I appreciate the help. Thank you!