Well I think the spare board may not be up to snuff... I can't eliminate the horizontal underscan with HSIZ maxed out and that's a deal breaker. Horizontal linearity is kinda meh too, and the only way to cure the foldover was to set the HPOS to max which de-centers the clipping of the active image (I think the DSP in the set digitizes the signal then tries to scale it to the raster). It's possible my spare board may have come from a set with a smaller CRT (KD-30XS maybe) and isn't designed/setup to work with my set, or maybe it is defective in some way.
IMG_20240922_001048819 by
Tom Carlson, on Flickr
IMG_20240922_001033745 by
Tom Carlson, on Flickr
There's about 1.5" of underscan on the left and 0.5" on the right.
These are the settings edits I made to get from the last posts picture to the above 2 pictures.
D1
VPOS was 24 now 25
VSIZ 23 now 34
VSCO 7 now 3
VPIN 20 now 13
D2-D3
HCNT 40 now 28
HPOS 29 now 63
HSIZ 41 now 63
SLIN 4 now 0
MPIN 10 now 15
PIN 9 now 6
UCP 42 now 37
LCP 36 now 35
LANG 24 now 22
VBOW 27 now 24
TBLK 4 now 3
BBLK 6 now 0
AKBT 16 now 6
MID1
DVPH 20 now 24
Not sure where I should go from here...I think there are 3 paths:
1.) I could go back and do some more work on the dead board if someone can give me some advice on what to change or test.
2.)I could try and improve the spare board that is %90 working in it now if anyone has any good suggestions for that. (unless I can find something on the schematic that changes with different size CRT's I've done everything I can think of).
3.)I could also try taking the other working sweep board from my spare working KD-34XS955 and install it in this set (once I figured out the release for the connections board swapping became easy) and see if it is a better match that service menu settings can make as good as the original board.
I'm probably going to default to path 3 if nobody has any suggestions.
The XS955 has sat unused in the garage for several months since the XBR960 took it's place in my upstairs TV room. I'm OK if the 955 ends up with a working but sub-par sweep board (I just want the 955 working so if the 960 breaks again I have the 955 to use for comparison/parts) as long as the 960 works as good as it was before it died. Given there's a flight of stairs separating the 2 sets the 955 is probably never going back in the upstairs TV room.