Hey guys...

So the roommies tonight gave me a hard time because I didn't want to turn my LCD RPTV right back on after it was turned off...I was told by a TV Tech to let the bulb cool before turning it back on again...

Is this true? Does it matter if it gets turned off and then right back on? The guy's were saying, "I NEVER heard that before, blah, blah, blah...and we're probably thinking I was being anal..." which may be the case...

I just want to know who's right...I say, it's gotta cool at least 15-20 minutes before getting turned back on...they say that it's ok to turn back on if it's still hot.

Thanks!

A hot bulb is Much more difficult to ignite than a cool one. 15 minutes might be a bit much( the fan only runs about 5 minutes after you turn the tv off )

Don't give in to the peer pressure.

That's how my bulb ended up dead. It won't die right on spot but you will pay shortly after. :)

But different TVs have different design. Your results may vary.

Your roomies are not well informed. I'd put a lock on the TV so that they won't touch the TV at all :)

Tell your roomies to learn to read owner's manuals. But what should they care, it's your TV and what's the chances they'll buy you a new lamp when their "advice" kills your present one.

Normally, tho, the TV will have a timer to prevent such a 'hot start". Since you didn't give a make or model, I can't verify this for your set.

Hey guys...

So the roommies tonight gave me a hard time because I didn't want to turn my LCD RPTV right back on after it was turned off...I was told by a TV Tech to let the bulb cool before turning it back on again...

Is this true? Does it matter if it gets turned off and then right back on? The guy's were saying, "I NEVER heard that before, blah, blah, blah...and we're probably thinking I was being anal..." which may be the case...

I just want to know who's right...I say, it's gotta cool at least 15-20 minutes before getting turned back on...they say that it's ok to turn back on if it's still hot.

Thanks!

Most of the newer sets are setup (like the Mit) that you can turn right back on within 10 to 30 sec. if not need to wait 1 to 2 min's, this is what the Mit owner's guide says anyway. but sure not good for the bulb if you do this much.

My roomate did the same thing, constantly, becuse he would hit the "All Off" button by mistake on the remote instead on "On Demand" which led to him turning it back on a few seconds after it was off. He also thought I would appreciate him sleeping downstairs by the A/C and running the TV all night because it helped him sleep. I finally got fed up with this and printed out a cost of the lamp for my Samsung DLP and told him to either buy a lamp, or watch TV else where. This hasn't been a problem since.

Tell your roomies to learn to read owner's manuals. But what should they care, it's your TV and what's the chances they'll buy you a new lamp when their "advice" kills your present one.

Normally, tho, the TV will have a timer to prevent such a 'hot start". Since you didn't give a make or model, I can't verify this for your set.

The model # of my TV is a Sony KDF-55WF655.

Thanks to everyone for the information...could someone do me a favor and actually tell me WHY it's a bad idea to turn it on right after turning it off? And if 15-20 minutes is overkill what is a safe amount of "wait" time?

One of my roommates just purchased a 60" SXRD (A3000 series)...so I want to let him know, that if he needs, how to best care for his TV as well...or at least be able to show that I'm right and he's wrong. :)

...could someone do me a favor and actually tell me WHY it's a bad idea to turn it on right after turning it off? ...

From what I've heard from techs on this forum and elsewhere, the problem is that to start a cold lamp extra juice is required to heat it up. If that juice is applied to a hot lamp it overheats the lamp and damages it. Maybe some new sets have circuitry that can detect when a lamp is hot and cut back on the power. But if you follow the owner's manual it should take care of all that.

From what I've heard from techs on this forum and elsewhere, the problem is that to start a cold lamp extra juice is required to heat it up. If that juice is applied to a hot lamp it overheats the lamp and damages it. Maybe some new sets have circuitry that can detect when a lamp is hot and cut back on the power. But if you follow the owner's manual it should take care of all that.

Hey thanks!

My (or his) manual doesn't say much about Lamp care other than caring for it while replacing it...the A3000 manual does say the lamp lasts about 8000 hours.

Does anyone know the ~ hour range for the KDF-55? It's a Sony 55" made back in 2004.

...Does anyone know the ~ hour range for the KDF-55? It's a Sony 55" made back in 2004.

Do a search of the older threads on this forum. There's lots of comments about this topic. I knw that when I first came on this forum in late 2004 there were a number of complaints of owners of this model about short bulb life, but that may have been the fault of the early lamps and may have been fixed.

BTW you do know that you can download the manual for your set at Sonystyle?

BTW you do know that you can download the manual for your set at Sonystyle?

I know, and I have it...it just doesn't say much about lamp life or lamp care OTHER than when it comes time to replace it...

Thanks for all your help! I really appreciate it!

You are well within your rights to tell your roomies to knock it off or go buy your own tv.

I have measured the temp of the bulb (on Sony 60 A2000)
after the cooling fan turns off (two minutes after power down) and the temp was ~200F. I measured the same except this time 20 minutes after powerdown and the bulb was ~125F. So if turning on the set with a hot bulb shortens the life of the bulb, then 20 minutes isn't too long. Maybe longer would be better.

I have a 60' Sony GWII, purchased Jan 1, 2004. It is my primary set. It has moved once (from my old house to my new apartment).
I am on the ORIGINAL BULB with over 11,000 hours on the bulb. (and for the record, no shadows, no stuck pixels, no green blobs, and the picture is still as vibrant as ever.. I thank UMD for his premium calibration tips.)

The only maintenance i have done in the almost four years i have had it, is to manually adjust the image revision in the service menu.

I have a 60' Sony GWII, purchased Jan 1, 2004. It is my primary set. It has moved once (from my old house to my new apartment).
I am on the ORIGINAL BULB with over 11,000 hours on the bulb. (and for the record, no shadows, no stuck pixels, no green blobs, and the picture is still as vibrant as ever.. I thank UMD for his premium calibration tips.)

The only maintenance i have done in the almost four years i have had it, is to manually adjust the image revision in the service menu.

Do you use a UPS and/or any power conditioners? Anything else unique about your setup?

-Evan

I think it's called LUCK. Just like my possy Panny 50LC13, some get 10,000+ hours of lamp life while most of us getting only less than 2,000 hours of lamp life.

EDIT: Based on my caculation, his TV is on 8 hours per day average.

You are well within your rights to tell your roomies to knock it off or go buy your own tv.

I have measured the temp of the bulb (on Sony 60 A2000)
after the cooling fan turns off (two minutes after power down) and the temp was ~200F. I measured the same except this time 20 minutes after powerdown and the bulb was ~125F. So if turning on the set with a hot bulb shortens the life of the bulb, then 20 minutes isn't too long. Maybe longer would be better.

See...I knew I wasn't crazy...or being too anal about things.

It's not they were turning my TV on, it's that they wanted me to turn it right back on after one of them turned it off so we could play Halo...and they didn't like it when I told them no...that it had to cool down for ~ 20 minutes first.

"I never heard of that", "that doesn't do anything", "if you turn it on while it's still hot it's fine, you just don't want to do it while it's cooling down"

Made me feel like a moron...it's pissed me off.

Yeah, I vote lock the TV down or take up a bulb replacement fund as well.

-Evan

Does anyone have any knowledge about not turning the tv off, leaving the bulb on constantly and how it effects the life of the bulb. I just found out my mother who got a new tv over a year ago has never turned it off. She turns off the satellite receiver, but not the tv. It does make the tv screen dark, but the bulb is still on.

From what I have heard in the past, bulbs in general will burn a very long time if you never turn them off. It's the on and off that shortens their life. Other than electricity usage, is this the way to go?

mythbusters ran a test on that on off thing and actually found that it doesn't seem to make a diffeerence.. take that as you will

Your bulb life is still around 6,000 to 8,000 if you leave it on all the time. It may be longer than those turn it on and off but not much.

Does anyone have any knowledge about not turning the tv off, leaving the bulb on constantly and how it effects the life of the bulb. I just found out my mother who got a new tv over a year ago has never turned it off. She turns off the satellite receiver, but not the tv. ...

Tell your mom that these lamps are rated in hours not days and for sure leaving it on overnight will cost her money. I've seen estimates that one on-off cycle is equivalent to anywhere between 30 to 90 minutes of run time in terms of wear and tear. I turn off my set if it's not going to be watched for the next hour or two.

Ironically I don't turn off my satellite receiver at night, for the reason that it won't work properly when you turn it back on. It goes into a funny wide-narrow format cycle that requires a particular reboot sequence to fix. I've talked to Bell Expressvu about it and they admit there's some kind of problem with those early HD receivers. I'm pretty sure they don't fix them because they want to make money pushing more expensive PVR receivers.

mythbusters ran a test on that on off thing and actually found that it doesn't seem to make a diffeerence.. take that as you will

Because mythbusters is real science... :rolleyes:

Do you use a UPS and/or any power conditioners? Anything else unique about your setup?

-Evan

It IS attached to APS-Back-UPS RS 1000...
but thats all nothing fancy.

If you are worried about bulb life....go with a Samsung HLT series. It is driven by a LED light engine and is rated beyond 20,000 hours with no color wheels. With 20,000 hours...that is a lifetime for the set.