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Re: Our 2 year old 52" HDTV (Mitzubishi)
Hi there.im not familiar with your actual set,but i assume it uses a metal hallide lamp,which,on average do around 2000 hours of use.lamp life is crucial to the cooling system,usually a fan.its paramount that this is working,and that the air intake filters are clean.the thermostat only ever fails due to the lamp overheating.which means the cooling system.most likely the filters,externally removable.regards,steve
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You need to replace the lamp. Order the correct type and code number (from samsungparts.com or the store where you bought the TV). Before starting the replacement, make sure the TV has been off for at least 30 minutes and unplug the set. Remove the phillips screw that holds the lamp cover and then the lamp cover itself. Remove the two screws that hold the lamp to the housing. Pull the old lamp out by the handle. Put the old lamp in a safe place until you can properly dispose of it.
Handle your new lamp carefully (wear gloves to avoid skin oils on the lamp). Put the new lamp in the housing and close up the TV by reversing the above steps (secure screws, replace lamp cover).
Symptom shows TV needs new lamp and existing lamp is getting weak / dying. Replace lamp in TV and procedure is written in user manual. Let me know model number of TV if you need user manual copy. Thanks.
We had a Hitachi that did the same thing. If you got it from a dealer.....TAKE IT BACK! The problem will not go away. It is a lamp heat sensor that protects the projector from over heating. These are defective and they don't know what to do to fix them. They will have you change out the lamp, send to a repairman to replace the sensor and he will have to watch it for a week to see if that cures it.
We messed with this for 10 months, before they finally did a buy back and we went and bought a new Sony.
Did you use an original replacement lamp or an aftermarket replacement? From the price you give, it sounds like an aftermarket lamp, which are notoriously buggy and the problem may be with the lamp. If not, the lamp driver is your next likely culprit. It is also called a lamp power supply or lamp ballast.
Did the technician replace the thermal sensors too? I think there are a few, one is in the color wheel cover. I'd suspect that it could take 40 min. to heat a faulty sensor to the trip point, and that this could make the TV turn the lamp off.
I have the same problem with my 56" HD Samsung. It shuts off automatically and then on the power button the word Lamp is light up in green. Sometimes I can turn it back on but other times it won't and I have to wait a bit. It's been embarassing a couple times when people were over for a movie. I believe it might be some kind of overheating problem but would like someone to confirm this.
It is unlikely that you can do anything yourself.
It sounds to me that there is a power supply problem that has steadily gotten worse and that cannot be confirmed remotely, it must be done on site by an equipped professional.