Originally posted by: mkiker2089
To me the issue is clear, his scaler does not accept non-spec 240p signals. If a 64 game running in "HD" which at the time meant NTSC SD works but games running at the default 240p don't then it's pretty simple.
Now if it's a hardware fault, we can't say for sure. If it is though it's a darn specific one.
Just to clarify, the OP can play 480 content, just nothing below that.
This is actually similar to a problem in the Atari forum. People were using cheap converter boxes to hook the Atari's up but new ones no longer accept the signal since it's out of spec and low power. this has led to a run on old VCRs in some circles as even if the tape portion doesn't work many of them will accept the RF and output it either via coax or component in a form TVs are happier with.
Op said N64 was working and now acting up on SWSOTE, So yes hardware failure obscure like this can happen. For example, I had a Vizio GVL47 that I got it was a 1080p 1920x1080 panel. I plugged in my bluray player and started up my test disc, and the second the 1920x1080 content hit the picture became solorized, pixilated and distorted. I figured the HDMI ports were shot so I took it to 1080i and hooked up the Componate cables and got a crystal clear picture no issues and it wasnt till then that I thought eh might as well try this via digial so I hooked the HDMI back up and tried 1080i all the way down to 420p and the picture was flawless. Ended up being the HDMI controller for 1920x1080 signals was shot it was a very well known issue with this panel and other Vizio/LG shared mainboards. I am trying to locate a true service manal for the ops Panel as the pack in manual is worthless as a wooden crowbar and mentions nothing about unsupported mode troubleshooting.