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If an LCD TV turns off after an hour, is the problem the LCD Lamp?

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Old 10-23-2008, 08:07 PM   #1
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Question If an LCD TV turns off after an hour, is the problem the LCD Lamp?

I'm looking to buy a Toshiba 26HLV66 that's almost 2 years old from someone, and they said that it turns off after about an hour of watching it, and then once it does, it is hard to keep on after that, like it will turn off quickly if you turn it back on again.

Is it a bad lamp or is it just overheating? I'm about to get it for $150 if it's just overheating. Good deal or not?

Please help, Thanks.
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Old 10-23-2008, 09:12 PM   #2
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Post Take it apart dust it up... clean it maybe you'll get lucky.

I doubt I could help you... I'm too far away. Besides you didn't give a lot of info in your message (and you probably don't know more). Let's put what we know in some sort of logic that might make sense..

If it turns on for an hour after a cooling period of say 8 hours... we might extrapolate that it's a heat problem. The test is to keep you window open on a cool day... and see if that would lengthen the time it stays alive... I had a dead monitor come back alive with a fan positioned on the critical component. Just about anything is possible.. from very simple/cheap to backlight transformer or eeps gas leakage off the cathodes.. or what about errant built in screen blank?

A bit too rich for my blood. If this was a ~50" with a high value, then I'd gamble that I could get lucky... or hold the parts long enough that another panel might arise with a known issue I could swap parts with.

Given the size 26" and the age... $150 it's a pretty big gamble. ($25 is closer to the mark)

Pass on this if you're not lucky. A quick peek at NewEgg, and $150 will get you a 22" monitor with warranty.... hook that up to a tuner and you'll look better.

Last edited by ah802; 10-23-2008 at 09:19 PM.
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Old 10-23-2008, 11:49 PM   #3
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I would pass on this display if I were you. Who wants a TV that doesn't stay on? I bet parts to "try" to fix it would likely cost more than just buying a new one when you add the original $150.00 to it.

I wouldn't pay more than $25.00 myself as a science project to tinker with as was previously said.
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Old 10-24-2008, 02:32 AM   #4
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Default But

I am wanting to use my monitor/tv as a way to play video games too. Last time I tried using a tuner, there was a delay between the game and what I saw, but it may have been because it was going through my computer. Can you give me a recommendation to buy? what's a good cheap monitor with a good tuner?
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Old 10-24-2008, 03:01 AM   #5
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How about this:

http://www.samsclub.com/shopping/nav...=5&item=407746

If you already have a cable box you do not even need a tuner so you could go with this:

http://www.samsclub.com/shopping/nav...230&pCatg=5902

Or this:

http://www.samsclub.com/shopping/nav...434&pCatg=5902
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Old 10-24-2008, 10:16 PM   #6
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I have an update. I bought the TV for $150, it works fine, and did for a little over an hour, and then it didn't turn off, the video stopped working. What could that be? The audio works. And the menus and stuff work, but not the built-in dvd player video or cable video work.
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Old 10-25-2008, 10:40 AM   #7
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I left it on all night with the fan blowing on it, and it stayed on. So the problem is obviously overheating.

But what part would disable the video because of overheating?
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Old 10-25-2008, 11:13 AM   #8
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Post Kinda too bad you didn't get the previous messages in time to nix the deal.

Quote:
Originally Posted by Scottocs View Post
I left it on all night with the fan blowing on it, and it stayed on. So the problem is obviously overheating.

But what part would disable the video because of overheating?
could be just about anything, but the main suspect would be the transformer supplying voltage to the backlight. To pin this one down you would need a 'smaller' fan and take the back off the unit to expose working parts... set small fan to blow on area that is suspect (define suspect area by placing hand on back of set when operational, and deduce what quadrant is warmest) and if the set works well.. you have the correct quadrant, next further refine the air movement (perhaps a tube taped over the fan) to pinpoint the component... replace.

Optionally you could just leave the fan in place..
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Old 10-25-2008, 11:53 AM   #9
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Here's two pics of the back of the TV. have any idea what part it could be? What is the transformer in this pic?

img184.imageshack.us/img184/6482/dsc04423yi3.jpg

img523.imageshack.us/img523/1629/dsc04425tz3.jpg
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Old 10-25-2008, 03:09 PM   #10
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Possibly the one with the tape on it in the middle would be my first guess.

You could also look at using a smaller fan as suggested and have it blow under the circuit board frame to blow air on the inside where the back light is behind the circuit board, and that could tell you if a fan for the back light is not working properly and causing the problem.

Also try using the smaller fan directly on that taped component and also on the power supply in the lower right hand side in the pics to figure out which component is overheating.
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