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Author Topic: DP100 DMD overheating Brian DeCiancio Film Handler Posts: 52 From: Warren, OH, USA Registered: Sep 2002 posted 04-28-2016 10:13 AM                        I have a DP100 running 6500 watts that the DMD temps reach, and sometimes exceed, the max temp of 140 degrees. All other temps are normal. All 3 DMDs run high, separated by only a few degrees. We have changed the pump, heat exchanger and flow switch. Filters and all internal air vents are clean and all fans are verified working. The coolant change was done "by the book" and the system pressurized. We even went as far as separating each component and forcing coolant back and forth to dislodge any possible clog. There was a bit of crud, but not large chunks of anything. No excessive force was needed to push the fluid thru, and the pump had a strong flow. Has anyone ever tried any type of detergent or cooling system flush product on a projector? Would there be any reason to think it would harm any components? Barco was unable to help in any way.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 04-28-2016 01:26 PM                     We were forced to use hig pressure air to clear the coolant from fittings and we did it by applying the air so it was opposite to the direction of the coolant flow to dislodge any aluminum oxide that may be restricting the flow  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-28-2016 01:27 PM                     You seem to have covered all the bases. It's usually lack of flow. But if you have flow and you can easily syringe coolant manually in the circuit,then I'm not sure. Can you run the circuit so coolant goes back into the bottle, do you see coolant flowing? When you turn the lamp on do the dmds get to 140 degrees very quickly or slowly?  |  IP: Logged Brian DeCiancio Film Handler Posts: 52 From: Warren, OH, USA Registered: Sep 2002 posted 04-28-2016 02:45 PM                        Yes, we watched it flow freely into the bottle. It takes about 5-10 minutes for the DMDs to get to 120, then a slow, but steady increase over 30+ minutes to reach max. BTW, I have a spare light engine (with a bad DMD) that I am willing to dig into and part out if it helps my cause and someone has some insight. Once the lamp is turned off, it cools down very quickly.  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 04-28-2016 03:47 PM                     Have to ask if the radiator fan is running. Also not sure if that Barco has it but the series 2 use the peltier cooling system as well. Is the voltage there for it?  |  IP: Logged Timothy Eiler Expert Film Handler Posts: 126 From: Litchfield , Minnesota, USA Registered: Mar 2000 posted 04-28-2016 03:55 PM                        Does the temp in the booth stay consistent?  |  IP: Logged Brian DeCiancio Film Handler Posts: 52 From: Warren, OH, USA Registered: Sep 2002 posted 04-28-2016 04:43 PM                        There are 4 fans in front of the heat exchanger (radiator). Yes, they are all running. The DP100 is nearly identical to the DP3000. Reading the service manual indicates that it does indeed use the Peltier modules if that part is also the same. I saw no reference to voltage in Communicator for them however. The booth temp is not relevant to this issue as all other temp readings are fine and the ambient temp is normal, but yes, it is consistent.  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 04-28-2016 05:15 PM                     There should be a led on the fan controller board labeled VTEC. It should be lit when the lamp is on. This indicates voltage to the peltier cooler.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 04-28-2016 08:30 PM                       Good call Stephan! This would explain a lot.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-29-2016 10:48 AM                     I guess an error should pop in if the VTEC is not there. If you see coolant flowing, I'd be surprised if deposits inside the circuit could cause such a loss of efficiency. I feel those circuits are very overspec'd, I once used a DP90 with no coolant flow and the peltier were enough to keep it cool - but with a smaller lamp. When the DMD's reach 100°C or so, what's the temperature of the coolant?  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 04-29-2016 12:29 PM                    That doesn't mean the reverse (coolant but no Peltier) is true. Maybe that's the most important of all.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-29-2016 05:09 PM                     Sure. I cannot remember the DP100 but as I said I would think that a missing voltage would be reported by the software. Definitely worth checking it, Peltier are before the coolant block so I wouldn't be surprised if they acted as insulator if they are not working. TEC is shown under STATUS/VOLTAGES. Alternatively, take a look at the SMPS control board - first on top. On the left hand side there are three LED's, one for each DMD, showing when the peltiers are on. I'm sure you are aware that if you open the card cage you will need to authorise the projector again, you will need a password and potentially a dallas key. Also, those old machines tend to develop unreliable contacts inside, sometimes just opening the card cage may cause trouble!  |  IP: Logged Brian DeCiancio Film Handler Posts: 52 From: Warren, OH, USA Registered: Sep 2002 posted 04-29-2016 09:38 PM                        Still working on the issue, but I appreciate all the input and thoughts.  |  IP: Logged Gavin Lewarne Master Film Handler Posts: 278 From: Plymouth, UK Registered: Aug 2009 posted 05-01-2016 05:57 AM                     just curious how the VTEC applies to the series 2 12c My VTEC indicator is never on, and after 2 hours my DMDs sit at 39c my fan controller board was replaced for another reason recently, but it never lit on the old one either. I just figured that was/is normal  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 05-01-2016 11:46 AM                     I do know 12C does not have coolant, but I cannot really remember re. peltiers. I guess the 12C it's only cooled by air. The ID card will tell the software what projector that is and what to expect in terms of connected sensors and fans.  |  IP: Logged

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