I have a pioneer pdp 5040 plasma and it just died on me. It will turn on then turn off after 3-4 sec. The standby light flashes 3x pauses then flashes 3x again, can I fix this

replace the power supply on the plasma TV

That is an error code that likely means power supply issue and based on brand not likely to be a do it yourself fix. Consider having a authorized Pioneer service center look at it and get an estimate.

Hello
The set can be set right by repair. You must have through knoledge in electronics to do work with set. especially, plasma displays will have very complicated circuits. It Sustain-Boards suld be trouble shooted.

Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electro-medical.blogspot.com/
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.

google it find p/s number inside tv if not charles hyde in uk

check y board and power supply

Hi, my PDP 50XE just cut out, when powered back on the screen powers down and the standby light flashes twice followed by a 5 sec gap.  Anyone got any thoughts? Thanks

The 3 blinks ( i assume they're blinking in red) means a scan assy problem. Check the scan A & B boards and the Y drive board. Something is shorted and loading down the Vscan voltage of the power supply.

C-Dog

Green flashing 3 times = digital DC - DC converter fault
Red flashing 3 times = scan circuit fault