Sony KV-27S42 Zig-Zaggy Blue Screen of Death
I've been working through modifying this set to accept a component and RGB signal. I had the component working fine but while troubleshooting the RGB input I must have done something inappropriate because now all I see is this.
Thus far I've removed all my modifications and have taken it back to stock as much as I can except for some of the resistors and capacitors that I've moved/removed. None of those moved/removed components had any impact on the picture prior to this. I had tested both composite and component prior to my little mistake and both still worked well.
I was using the instructions from the sunthar site: https://sector.sunthar.com/guides/crt-rgb-mod/sony-kv-27s42-rgb.html#step-5-connect-sync-and-s-video-detect
Problem is I'm not entirely sure what I did. I could've bridged two points with my soldering iron. I honestly can't say. I checked for solder bridges, loose connections, cold solder joints, everything. Normally I'd be seeing "input 1" right here. But now, nothing. just the blue zig-zags and a flashing status light.
Any advice where to start investigating?
Thanks!
Edit:
here's some imgur links with descriptions: https://imgur.com/a/E2oljKx
and for the mux troubleshooting i was doing: https://imgur.com/a/TJxLRiC