POWER SHUTS DOWN AFTER 1 SECOND - Pioneer SD-533HD5 53" Rear Projection HDTV

Bad capacitor in board

Yes. It is probably a problem with the internal power circuitry. Look in the circuit board area where the power cord mates with it for capacitors that have bulging tops (instead of the flat tops that are normal). If you see even one, you need to replace all the large capacitors othe power supply section (normally around 5 or 6).

There's a couple of possibilities; power supply shutting down because of a fault within it; the PS shutting down because of excessive current drawn and that can be caused by a failure in the final amplifiers which are probably modular in design.

Hi,
Please check and fix your defective capacitor on power supply circuit.
Regards, Jay

Sounds like a protection circuit kicking on and off, and it will have to be troubleshot to isolate and replace the faulty circuit, whatever it may be. If you have an extended warranty, try to get it fixed for free. If not, make sure you get an estimate before you pay to have it fixed. Oftentimes the cost of repair will exceeed the cost of a new one, as fast as prices keep coming down these days.

My unit shuts off after about 2 seconds. It seems like it tries to go, but it sounds like it stops working and then 1 or 2 more seconds run off and it shuts down. Then you hit start again and it lights up inside and then shuts down. It's only about 2 or 3 years old.Any solutions?

It sounds like the picture tube in the monitor has burned out. Time to replace.

check R517 on the power supply board if burnt replace with 5% 1/4 watt 10K carbon resistor.

does the led flash when you try to press power after it shuts down, or when it shuts down? If so how many times does it flash?