If misery loves company your not alone in this as you can tell.
Yeah I was going to say they will take it back with a restocking fee, but hey it's better than having to eat the whole thing.
As a aside do not mention you installed/used the board if/when you go to return it.
I think I read on their site the part cannot be used although when I spoke with Customer Service prior to ordering my Deflection Board and inquired about returning it "if I didn't need it" (hint hint) the
lady didn't mention nothing about it.
I too brought into the whole Pioneer Elite products except for the TV. So far the DVD Player and the Cassette Deck still work.
While looking for a solution to my issue I came across another board where there was a post about Pioneer Elite RPTV's. Seems there was a class action suit out of California brought by owners of those sets in 2007.
Here's the link -->> http://www.pioneerelectronics.com/pio/pe/images/portal/cit_3424/312527962NoticeandPendency.pdf
Maybe it applies to you and you can get your set fixed for free.
While I can get my set to turn on I'm still stuck w/no Video or Audio which was the original issue. There are plenty of qualified people out there who can fix these things but at what cost?
Since Pioneer is out of the TV game there isn't any source for technical support. So one either replaces Boards or the components therein till they get it fixed. That can get pricey.
A co-worker had issues w/his old Sony RPTV and he called the same repair service I did. Difference is Sony is still in the TV game so they were able to fix his set with calls to Sony.
I was prepared to spend a few hundred on getting my set repaired but not $1,000 or more. Which would be the cost if I brought all the Electronic Diagnostic Tools required to repair the set myself or keep paying the repair people to, well keep guessing.
Sometimes you just gotta let go.
If it helps there's been a lot of posts on the Internet over the last year or so with RPTV's finally giving up the ghost. I've had mine since 2002 so 10 years of perfect use isn't to shabby. Probably won't get near that with today's made in China stuff.
If your going to continue to play with it.
Use the Service Manual and focus on the the "over load protection circuits". That's what shuts the system down. You again can use the Manual to get the part numbers for Diodes, IC's etc and replace them. Most are still available and are very cheap.
Since you've done some soldering already. Also use a multimeter and check the resistors, replace as needed.
I'll post back if I find/think of anything else.