This started suddenly. Set will power on, make the chime sound, do it's normal powerup sequence and displays image for < a minute, then the lamp turns off, screen goes black.
The red TEMP signal shows on front. The set loses communication and has to be unplugged,
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It probably has a fault.But try this.Disconnect all speakers and inputs
and try again.If that works reconnect the speakers A PAIR AT a
Time.That should lead to the fault.If that still shuts down.
the set is going into protection mode. This is caused when ever one of
the many sections of the tv has a shorted circuit. The increase in
current is detected by the protection circuit and it flies into action
by turning OFF the ON relay.
Most often, but not always, it is either the high voltage section or
one of the deflection amplifiers. But can be the power supply, the
audio amplifier or voltage regulators, etc.
- Check the back cover "Switch cover" located bottom right. Make sure it is plugged in properly to the digital board (big silver case board".
- could also be sighns of the light or color wheel going. Lights at the front will let you know with flashing sequence.
This is a DLP projection that has a ballast and color wheel along with a lamp. The three flashing lights on the front are a diagnostic code. The exact meaning is listed in the owner's manual under troubleshooting. I don't have the manual for your model with me at the moment, so I can't look it up. Since the unit works OK for a while, it suggests that a component is failing under heat stress. This is often the ballast. The ballast is the part that provides the power for the lamp similar to the ballast in a flourescent light. Check the manual for the code and post it here. Also, because your model uses 2 different ballast/lamp combinations, you will need to get the lamp number off of the lamp. Please post that here too.
In the meantime, check the rear area for any obstruction in the air flow. There should be a fan in the rear that needs to be clear of debris and can turn freely. With the set unplugged, try turning hte fan by hand. It should turn easily and continue on its own slowing down to a stop. If it stops suddenly, the fan may be defective and not moving enough air to keep the lamp cool.
Do you get any flashing lights? Such as Lamp or Temp? A common problem with these is the light not coming on. Sounds like a temperature issue. When you turn the TV on when it is cool, pull it forward and check the rear on the left to see if you can see the fan turning where the lamp is.
The light system is pretty straight forward: Power Board -> Ballast -> Lamp. It is controlled by the DLP Board, though. Since it is powering up, it sounds like the Power Board and Ballast are okay. The ballast is used to kick start the lamp on (similar to flourescent lights) but not during normal operation.
The high-pitched whine is definitely the color wheel. The early color wheels had problems and many had to be replaced. As part of the turn-on process, the TV checks for light and then checks for color wheel sync. If the bearings are wearing out/dried out, it could cause issues with getting the proper color wheel sync, causing the set to not pass the turn on sequence.
Check Sears or partstore.com for a color wheel. I like sears for experimental replacements since they allow easy returns.
BTW, mine is an early 61". My color wheel was replaced when I had to replace my Light Engine. My in-laws 50" was an early one and theirs went out within 2 years.