Strange Wells Gardner 9200 chassis

[leopardus2]

My WG 27" d9200 chassis died and I bought a tested replacement (2nd hand) but it looks different than the one I have on my machine (an IT silver strike bowling).
It looks similar as far as components placement go, but there are some differences here and there.
The neck board has an "RCA ORION" label on it, together with the wells gardner name!
I tried the chassis and only the green is working. Could it be that the chassis is for the 33" tube and not the 27"? Is there a way for me to check that?
I am attaching few pics of the strange chassis. Any help is appreciated!

Thanks
Rick

[leopardus2]

Sorry I meant the "neck board" , that's the one with RCA ORION writing.

[mgb]

Did you replace only the neck board or the whole chassis and neck board?

I don't see where the chassis for the wrong size tube would only give you one color. If anything if say the picture would just be over scanned or something.

I know those boards have a lot of interconnect cables, could one of those be disconnected or wrong?

[leopardus2]

I replaced the entire thing (chassis and neck board).
The weird thing is, the small connectors (for RGB, neck board power etc) are different between the two sets - by different I mean different shape, not different connections: same number of pins, labeled the same, just different shape so that I cannot use the cables from my old chassis with the neck board of the replacement chassis, unless I desolder the connectors from one neck board and move them to the other neck board. Weird!

So I assume I could have burned out driver transistors on the neck board. The replacement chassis in theory was guaranteed as tested, but of course you can never know.
I tried to enter the factory menu and play with the values but no change. I only have the green.

What puzzles me now most is, what kind of neck board is this. It is marked wells gardner and has same pinout, and component layout of the old one (which looks like a standard d9200 neck board) but there are differences, eg. the power resistors are smaller, there are other small differences... and this odd mark RCA ORION.

Part number for the odd neck board is 025A1569-001E where the old one I had is 025A1625-001B.

Any idea what may I have got?

Thanks
Rick

[leopardus2]

I should also add that I double and triple checked all cables and have verified with the oscilloscope that th R, G and B are present at the connector on the neck board.

[leopardus2]

Ahhhh I think I have found the answer myself....  while most pics around are for the D9204 chassis (latest version) what I've got is the older version D9200.
I found the older manual online and the neck board pictured there is identical to the one I have.
So I was looking the wrong schematic :-)

[leopardus2]

Turns out the output transistors on neck board were fried. Replaced them with the ones from the other chasiss and now I have a working d9200 (first gen!)

Rick

[mgb]

Nice.
Glad to hear you've got it fixed.