I have a pioneer pdp-4300 no remote and the buttons don't work! I ave a cheap remote that turns it on/off and works except I can't change anything in setup and i need to adjust the horz/vert bright contrast

SOURCE: Pioneer PDP-503PU

Very possible,but yet,this might be the manufacturer defect power supply which they will fix it for you free;but before we jump to this conclusion,you need to test it first:
-Unplug the power cords.
-Unplug the media video cable from the box to the tv.
-Check all the pins on the video cable are in place as well as the connectors both behind the TV and the media box.
-Reconnect the media box and TV with the video cable(DVI+VGA in one) and have at least a video component hook up to it(ex. dvd player/VCR or comcast box) be sure this video player is turn on and running,at the same time,be sure it is under the right video input.
If you have tried the above steps but still doesn't work,call 1-800-pioneer Tuesday-Thursday at7amPST and address your issue to them.
Let me know if you have any additional questions!
solutiondoct

SOURCE: Can't turn on from Stanby mode

I would assume the power board has a problem. A tech could possibly repair it without replacing the whole board.

SOURCE: Pioneer PDP-5030HD power supply

click link -ebay shop selling power supply boards for 503hde/pe at 180 pounds you will have to contact him has he does not list them as pioneer are only ment to replace these boards or shops under contract with pioneer i changed mine and only takes min's when you have got the back cover off...

http://stores.ebay.co.uk/Plasma-Parts-UK

hope this helps mark doran

SOURCE: Pioneer PDP-504PU gREEN AND RED LIDS

Here are all the codes for all Pioneer PDP problems....enjoy.

SOURCE: Pioneer PDP-RX06XE has no picture

check PDP 436XPE UNIT may be Y board short...or need factory restore to the original state....