| brightpanel |
I've searched for this problem, but couldn't find it anywhere, here it goes:
First let me start by letting you know the equipment I'm using. I have 2 panels, a Spectra Pro and an ASK WSX (I'll explain why later), and a Bell and Howell 310 OHP which uses 600W Halogen bulbs. Yes, I know this OHP is old!
With that said, here is the problem I've been having. I'll put either panel on the OHP and for a minute everything works perfect. After a minute, however, the panel gets a black spot (1-2 inch diameter) towards the middle and seems to expand and get bigger by the second. It does this for both panels...
Is the panel overheating from the old OHP? If so, what should I do? I've tried fans and still nothing is helping, same large black spot. Is there a way to make the light less intense?
Are my settings for my video card causing this? I have it set at 800x600 70Hz and 32bit.
I ordered the OHP from DIYLABS and Alan said that he used his Panasonic LCD panel with the OHP and it worked fine. I know it can't be my panels because both are having the same problem. The reason I bought two is in case one burns out I have a back-up. |
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| brightpanel |
| Correction it's a B&H 301. The light is way too intense. Any suggestions? Please help. |
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| Space Ninja |
brightpanel it definitely sounds like an over heating problem. Growing black spots are not normal unless the lcd is overheated. I have never used an ohp and lcd panel before because my enclosure was custom built but I think you need to put some space between the lcd panel and the ohp. Make sure that air can flow past the bottom and the top of the lcd other wise the heat from the bottom of the lcd has to travel through the lcd to escape at the top of the lcd. No good in my opinion. Put something to prop up the lcd in the 4 corners, put your fan on there, and see if the black spot lessens or goes away.
This is your lcd :) this is your lcd on 600w halogen :hot: |
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| brightpanel |
I tried this and the same thing happens, but it takes a little longer for it to happen. Maybe 30 seconds longer. :bawling:
I forgot to mention that I'm not using a glass base, just the fresnel.
I noticed the fresnel lens seems to focus and intensify the light all towards the center. When I put my hand even 2 feet above the fresnel lense, the light is so overbearingly hot it almost burns my hand.
I am considering to get a IR (Infrared Red) filter as I read elsewhere that the intense light and heat could be coming from this.
In a nutshell, Halogens are amazingly bring :) but on the downside too intense, at least in my case.
I'm posting in hope to get a response as to if this is the best option. Help is greatly appreciated! |
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| brightpanel |
| Wow, 53 views and no response. |
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| vudutek |
It does sound like the heat is still the issue. The lack of a glass base means one less layer of blockage from the rising heat.
Try removing the panel, and put your hand in it's place. If it gets warm/ hot in a short period of time, it's too much for the panel. Most panels can't handle above around 95f (if memory serves me correctly). |
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| brightpanel |
| Thanks for your response. I felt the glass and "OUCH". Funny, Alan from DIYLABS told me it worked well with his Panasonic panel for over an hour and that the panel never even got hot. He said it stayed cool. How come two of my panels get overheated in one minuite, while his stays cool? This doesn't make sense. He used the same set-up as me. Anyone? |
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| jcbklyny |
The temp should remain at a max of 90 degrees at the LCD. I think even that is too hot even though they can take up to 110... usually.
If your burning your hand 2 feet over the unit... it's simply too hot.
I really dont think all the fans in the world would solve your problem. You need a different light source. |
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| MC |
| Burning your had 2 feet over... Dang, maybe i shouldn't have just bought that 600 watt halogen :eek: |
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