4th installment. Bought ANOTHER HD-SAT520 and this one I got a little farther on. I got no OTA HD, all said no signal, so I did a 3 finger reset. prior to this I dod a system dignostic and the digi tuner cam e up with a NG status (no good?) in the hidden diagnostic screen. I did a 3 finger reset and did a VRAM dump and that got me HD for about 2 minutes, then it went dark again. Called DirectV and authorized it and I got sat AND HD for about 10 minutes, did a diag on the digi tuner and it came up OK (although analog tuner came up NG this time) for about 10 minutes, then it went dark, faded to green "northern lights" and then went black, with NO SIGNAL scrolling on bottom. Looking on the mobo, I can see I have the same red LED lit on both bad tuners now, its DL301, right next to the LG chip behind the INFO button on the front panel. All other LED's are green on the bpoard. I assume its a diag light for a subassembly or chip but which one? There is an F301 component, its a 3 prong ceramic looking capacitor next to the digi tuner module. IT says F45C and then a small m in a C..what is this? bad on both boards?