Quick restart or no quick restart on 52HMX85 - Canadian TV, Computing and Home Theatre Forums

emichon · 2005-12-11, 10:03 AM

Who thinks that the quick restart might extend the life of the lamp (since it's going in standby mode, and the fans are cooling for about 10 mins after you turn it off).

I don't really use the TV's quick restart because if I know Im only going to be away from the TV for 15-20 mins I don't turn it off. But I still keep the feature on since it cools the lamp after turning it off.

What do you guys think is the best to extend the lamp life?

WilJP · 2005-12-11, 11:26 AM

Don't see why you wouldn't keep it on. Sudden temperature shifts can crack hot bulbs, so the fan idea seems good.

MediaRoomManiac · 2005-12-11, 12:42 PM

I keep my quickstart on always. No harm in it and it will help extend bulb life. I don't see any advantage in keeping quickstart off.

57 · 2005-12-11, 01:37 PM

I'm not sure, but quick restart may have more parasitic power draw, so that is a disadvantage, but not if it means that the bulb life is shorter.

I don't believe that's the case though, as the bulb gets the appropriate cooling period anyway doesn't it when you turn the TV off, with our without the quickstart feature?

WilJP · 2005-12-11, 01:59 PM

Quote:

Originally Posted by 57

I'm not sure, but quick restart may have more parasitic power draw, so that is a disadvantage, but not if it means that the bulb life is shorter.

I don't believe that's the case though, as the bulb gets the appropriate cooling period anyway doesn't it when you turn the TV off, with our without the quickstart feature?

If I turn the tv on, the bulb shoots up to 200C pretty quick (according the manual). If I turn it off right away (say I turn the tv on to only check the weather), the bulb suddenly drops down to room temp without quick restart. If I turn it back on again (say I forget to check windchill

), the bulb gets another 200C spike. The rapid temperature flux according to the manufacturer and common sense would be bad for a delicate quartz lamp.

I think what quick restart does is provide you with a window of opportunity to switch the tv on and off without spiking the lamp temp. Of course, if you decide to turn the tv off, wait for quickstart to disengage and then turn it back on, it achieves similar temp spikes.

TGrimm · 2005-12-11, 04:14 PM

I'm not sure QuickRestart provides any bulb life benefits, in fact I suspect the opposite is true.

On my 46hmx85, with QuickRestart enabled, I notice that the bulb does not turn off immediately when you turn off the TV. I think all that happens is that DLP is configured so that light is not reflected to the screen. Because the bulb is not turned off, turning on the TV will give you immediate full on response.

This is readily observed at night with the lights off. With QuickRestart enabled you will notice that there is a very slight greyness to the screen -- meaning that the bulb is still on. If you do the same thing with QuickRestart disabled you will notice that the screen goes to full black, indicating that the bulb has in-fact turned off.

Nowhere can I see, in any documentation, where QuickRestart provides any bulb life benefits -- if this were true then I'm sure that Toshiba would be describing this as a benefit!

WilJP · 2005-12-11, 05:13 PM

That's the whole point, the bulb and fan stay on to prevent temperature spikes.

TGrimm · 2005-12-11, 08:06 PM

Quote:

Originally Posted by WilJP

That's the whole point, the bulb and fan stay on to prevent temperature spikes.

I'm not sure I understand.

You'll find that the bulb will stay on for x minutes and then turn off, along with the fan.

You gain nothing with respect to preventing termperature spikes. The key would be if the fan stays on _after_ the bulb turns off -- this is not the case. You've only succeeded in leaving the bulb on for x minutes longer than you would have.

[edit1] A benefit would be realized if the bulb tansitioned to some fractional power while in QuickRestart but I have read nothing to indicate this is the case. (this would reduce temperature gradually)

[edit2] If you turn your TV on and off frequently within x minutes (10?) then QuickRestart definitely provides a benefit (the bulb never turns off). If you don't operate this way then it seems to me that this just uses up bulb life.

WilJP · 2005-12-11, 09:45 PM

Quote:

Originally Posted by TGrimm

[edit2] If you turn your TV on and off frequently within x minutes (10?) then QuickRestart definitely provides a benefit (the bulb never turns off). If you don't operate this way then it seems to me that this just uses up bulb life.

that's what I meant. the whole point of it is to let you "quickly restart" without damaging the lamp (ie spiking its temperature). outside of these conditions, you're absolutely right, it doesn't do anything to preserve lamp life, if not the opposite.

HiFiPete · 2005-12-24, 04:34 PM

i think the lamp does draw less power when the T.V is shut off and the quick restart is set on "on." It could possibly aid in lamp life.

cuz in back of your manual, where it tells you the specs, it says that in standby mode, the T.V only draws 1 or 2 watts. I'm guessing by this spec alone that the bulb does in fact glow but very dimly. Wether the quick-restart is considered a stand-by mode, I don't know

2005-12-11, 10:03 AM	#1
emichon Join Date: Sep 2005 Location: Moncton, New Brunswick Posts: 86	Quick restart or no quick restart on 52HMX85 Who thinks that the quick restart might extend the life of the lamp (since it's going in standby mode, and the fans are cooling for about 10 mins after you turn it off). I don't really use the TV's quick restart because if I know Im only going to be away from the TV for 15-20 mins I don't turn it off. But I still keep the feature on since it cools the lamp after turning it off. What do you guys think is the best to extend the lamp life?

2005-12-11, 12:42 PM	#3
MediaRoomManiac Join Date: Oct 2005 Location: Ajax, ON Posts: 299	I keep my quickstart on always. No harm in it and it will help extend bulb life. I don't see any advantage in keeping quickstart off. __________________ Sony KDL46HX800, BDPS470\|Pio 1020\|PS3 80G\|Athena AS-F1s, C1\|Energy VMinis, V10\|Moto VIP1232\|HOne\|APC UPS

2005-12-11, 01:37 PM	#4
57 Moderator Join Date: May 2002 Location: Toronto, Rogers, 8300HD, eHDD, Panasonic TCP65S1, Denon AVR4310Ci; 8300HD, eHDD & Sony KDL40W3000 Posts: 50,301	I'm not sure, but quick restart may have more parasitic power draw, so that is a disadvantage, but not if it means that the bulb life is shorter. I don't believe that's the case though, as the bulb gets the appropriate cooling period anyway doesn't it when you turn the TV off, with our without the quickstart feature? __________________ 57's Home Theatre (Latest equipment & photos) 57's Optimization Services (Home Theatre Optimization)

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2005-12-11, 11:26 AM	#2
WilJP Join Date: Nov 2005 Posts: 77	Don't see why you wouldn't keep it on. Sudden temperature shifts can crack hot bulbs, so the fan idea seems good.

2005-12-11, 04:14 PM	#6
TGrimm Join Date: Dec 2005 Posts: 11	I'm not sure QuickRestart provides any bulb life benefits, in fact I suspect the opposite is true. On my 46hmx85, with QuickRestart enabled, I notice that the bulb does not turn off immediately when you turn off the TV. I think all that happens is that DLP is configured so that light is not reflected to the screen. Because the bulb is not turned off, turning on the TV will give you immediate full on response. This is readily observed at night with the lights off. With QuickRestart enabled you will notice that there is a very slight greyness to the screen -- meaning that the bulb is still on. If you do the same thing with QuickRestart disabled you will notice that the screen goes to full black, indicating that the bulb has in-fact turned off. Nowhere can I see, in any documentation, where QuickRestart provides any bulb life benefits -- if this were true then I'm sure that Toshiba would be describing this as a benefit!

2005-12-11, 05:13 PM	#7
WilJP Join Date: Nov 2005 Posts: 77	That's the whole point, the bulb and fan stay on to prevent temperature spikes.

2005-12-24, 04:34 PM	#10
HiFiPete Join Date: Nov 2005 Location: Vancouver, BC Posts: 21	i think the lamp does draw less power when the T.V is shut off and the quick restart is set on "on." It could possibly aid in lamp life. cuz in back of your manual, where it tells you the specs, it says that in standby mode, the T.V only draws 1 or 2 watts. I'm guessing by this spec alone that the bulb does in fact glow but very dimly. Wether the quick-restart is considered a stand-by mode, I don't know