56" DLP Turns on for just a few seconds, then off with the dreaded 3 lights
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I power on the TV, and it starts warming up. There are no odd sounds (like if the color wheel is bad), and the audio is fine. The picture starts to come up, but it is very dim. Then after about 15-30 seconds, it powers off and the three lights start blinking. If I try to turn it on a second time, the screen is just black, but the audio is still there.
We looked at the lamp and it doesn't look like it's out...no burns, filament looks fine. Could it be the ballast?
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Re: 56" DLP Turns on for just a few seconds, then off...
Maybe, but I would replace the lamp first. the system looks at current draw from the lamp if it is too high it will shut down. these lamps are hard to detemine weakness by physical appearance. they are gas under presure. if after replacing the lamp the unit still has this problem then the balast. I have also seen the DMD board cause this problem. but the lamp is the most likley problem.
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make sure put the lamp door back before trying to turn it on because they have switches on them that allow the tv to turn on. If that is ok you probably have a bad ballast. Call a local tv repair shop to further diagnose the problem.
You are going to have to troubleshoot all the boards in the television until you find the problem. Start with power supply board. This part usually goes bad due to overheating and faulty components. You must check for brown spots on the boards , that are signs of overheating. Look for bad components like bulging capacitors and burnt resistors.Look for bad connections, like cold solder joints. you must be very careful working on the power supply board as it does have high voltages they can be very dangerous to the inexperienced user. Never test anything with the power on or connected.Use anti static protection straps and gloves around all the chips and microprocessors to avoid damaging them. Check all the other boards for the same problems. If you can find no problems, Then it is time to get help from a service center where they will have all the necessary testing equipment, To give the unit a more thorough testing for faulty components.Hope this helps you with your problem.
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.