My Samsung HL-T5075S TV shuts off after being on for awhile and will not turn back on,also if you turn it off you have to wait awhile before turning it back on, I have tried unplugging it for up to one hour, this helps for a short time. Sometimes it will stay on for hours ,other times it will only stay on for a few minutes.

Sorry Angela Thurner,

No reset is going to help...
You MOST LIKELY HAVE A POWER-BOARD failure.

SAMSUNG would like you to believe their
sets are SACRED INSIDE... Were that true...
They would have spent a FEW MORE PENNIES on those
(my opinion) cheap-cheesy GUM-WRAPPER capacitors
they regularly used...

((No idea if the SAMSUNG "settlement" had any effect))...

Rest assured SAMSUNG is not alone in their
power issues... MOST vendors have similar issues
(again... my opinion).

If you have the TIME, Care & inclination...
I think any careful person can get in/out safely...
Always with POWER OFF.

Comment me back... or read back about 5 entries...

I have written BUNCHES OF ARTICLES...

Everything to do with taking pictures, care and
RELIGEOUSLY wearing anti-static wrist strap ($6)

and $50 to $100 power board (see below)...

ELSE...
shopjimmy.com (USA circuit board source)

I come here daily... Comment me back

eBay...
Samsung HLT5075SX HL T5075S Power Supply Board PN082DPS VF eBay

Carnac the Magnificent

If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
Replacemsnt procedure to both lamp and ballast to projection TVs are given with illustrations.

analog board is most likely cause. Especially if you cant shut it off or change channels when it freezes.

Clean the fans in the back

Hi,Hi,do you hear any strange noises? If you hear clicking or like wanting to turn on it could be the board that powers the lamp it's called the ballast.The ballast is the most common failure on Samsung sets it has a sensor that detects if it's not lighting up the lamp or if the lamp is not responding.Pay attention to any sounds your tv makes. Here's the link to replace the ballast :http://www.fixyourdlp.com/guides/samsung/bp47-00033a.php Have a blessed one!

try the lamp door switch in the back of the TV, door is held on by 1 screw, after door is open there is a blue switch by the slide that protects the lamp. push the switch down and up a couple of times then put cover back on and see if tv stays on. this was my problem with this exact tv.

Ballast Board also make sure your Fans are running if Fan stops running to Lamp set will turn off Call Encompass Parts Distr. 1-800-638-3328 visit their website as well. Ballast board is what turns Lamp on.

That sounds like the digital board is bad if the TV comes on as soon as you plug it in and you can;t do anything to turn it off but unplug it. The digital board part number for the HLT5075S is BP96-01831A

We just replaced our color wheel and it took about 2 hours.  We used this site because it was the only one that somewhat resembled our TV http://guides.fixyourdlp.com/samsung/bp96-01579a.php  Our TV had a loud humming noise and no picture.  We also had to replace the bulb.  Hope this helps.

We have a Samsung HL-S6187W that's only a year and a half old that was having the same problem.... it would shut off for no reason... sometimes after being on for awhile but then sometimes it would shut off w/in a minute of it being on. Called Samsung support and they said to unplug and "reset" the T.V. and if that didn't happen they'd send a tech out (at a fairly steep service charge) and they would troubleshoot it. Talked to my audio/video guy that installed it all and he said it was probably the lamp that needed to be replaced (obviously for labor and parts charge). We really don't use the T.V. that much (have another flat screen 20' away in the kitchen we watch more often) so I seriously doubted it was the lamp.... plus it couldn't be turning off from over heating because sometimes it would turn off RIGHT after turning the set on.

After reading several suggestions here on Fixya I incorporated a few options to try and fix it myself and I am ecstatic to report that it's been over a month and a half, and we've watched it alot, and it's completely FIXED and doesn't turn off anymore --- and it didn't cost me a cent to fix!!! WOW!! Thanks to all the suggestions... this is a great website!!

Here's what I did:
1. Took off back lamp cover and vacuumed out the entire area (there wasn't ANY dust... but thought it couldn't hurt to clean it out anyway).
2. I disconnected the temperature sensor and cleaned off the contacts and plugged back in firmly.. (I think this is what the real solution was),
3. I then moved the "Auto Shut Off Switch" back and forth a little then made sure it was in the correct position when I replaced the lamp door cover (it's not hard to make sure it's positioned correctly).

Voila!! It's all fixed! This site has great pictures of the correct way to position the Auto Shut Off Switch and of the temp. sensor if you need it.